View EDE2508AEBG-6E-E_4567859.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

DATA SHEET
256M bits DDR2 SDRAM
EDE2508AEBG (32M words x 8 bits) EDE2516AEBG (16M words x 16 bits)
Specifications
* Density: 256M bits * Organization 8M words x 8 bits x 4 banks (EDE2508AEBG) 4M words x 16 bits x 4 banks (EDE2516AEBG) * Package 60-ball FBGA (EDE2508AEBG) 84-ball FBGA (EDE2516AEBG) Lead-free (RoHS compliant) * Power supply: VDD, VDDQ = 1.8V 0.1V * Data rate: 800Mbps/667Mbps (max.) * 1KB page size Row address: A0 to A12 Column address: A0 to A9 (EDE2508AEBG) A0 to A8 (EDE2516AEBG) * Four internal banks for concurrent operation * Interface: SSTL_18 * Burst lengths (BL): 4, 8 * Burst type (BT): Sequential (4, 8) Interleave (4, 8) * /CAS Latency (CL): 3, 4, 5, 6 * Precharge: auto precharge option for each burst access * Driver strength: normal/weak * Refresh: auto-refresh, self-refresh
Features
* Double-data-rate architecture; two data transfers per clock cycle * The high-speed data transfer is realized by the 4 bits prefetch pipelined architecture * Bi-directional differential data strobe (DQS and /DQS) is transmitted/received with data for capturing data at the receiver * DQS is edge-aligned with data for READs; centeraligned with data for WRITEs * Differential clock inputs (CK and /CK) * DLL aligns DQ and DQS transitions with CK transitions * Commands entered on each positive CK edge; data and data mask referenced to both edges of DQS * Data mask (DM) for write data * Posted /CAS by programmable additive latency for better command and data bus efficiency * Off-Chip-Driver Impedance Adjustment and On-DieTermination for better signal quality * Programmable RDQS, /RDQS output for making x 8 organization compatible to x 4 organization * /DQS, (/RDQS) can be disabled for single-ended Data Strobe operation
* Refresh cycles: 8192 cycles/64ms
Average refresh period 7.8s at 0C TC +85C 3.9s at +85C < TC +95C * Operating case temperature range TC = 0C to +95C
Document No. E1175E20 (Ver. 2.0) Date Published January 2008 (K) Japan Printed in Japan URL: http://www.elpida.com (c)Elpida Memory, Inc. 2007-2008
EDE2508AEBG, EDE2516AEBG
Ordering Information
Part number EDE2508AEBG-8E-E EDE2508AEBG-6E-E EDE2516AEBG-8E-E EDE2516AEBG-6E-E Mask version E Organization (words x bits) 32M x 8 16M x 16 Internal Banks 4 Speed bin (CL-tRCD-tRP) DDR2-800 (5-5-5) DDR2-667 (5-5-5) DDR2-800 (5-5-5) DDR2-667 (5-5-5) Package 60-ball FBGA 84-ball FBGA
Part Number
E D E 25 08 A E BG - 8E - E
Elpida Memory Type D: Monolithic Device Product Family E: DDR2 Density / Bank 25: 256Mb /4-bank Organization 08: x8 16: x16 Power Supply, Interface A: 1.8V, SSTL_18 Environment code E: Lead Free (RoHS compliant) Speed 8E: DDR2-800 (5-5-5) 6E: DDR2-667 (5-5-5)
Package BG: FBGA Die Rev.
Data Sheet E1175E20 (Ver. 2.0)
2
EDE2508AEBG, EDE2516AEBG
Pin Configurations
/xxx indicates active low signal.
60-ball FBGA (x8 organization) 1 A VDD NU/ /RDQS VSS B DQ6 C VDDQ D DQ4 E VDDL VREF F CKE G NC H A10 J VSS K L VDD A12 NC (Top view) N VSS P A7 R VDD A12 NC NC NC A9 A11 A8 VSS A3 A5 A6 A4 NC NC A3 A7 A5 A9 A6 A11 A4 A8 VSS A1 A2 A0 VDD BA0 BA1 /CAS /CS /WE /RAS /CK ODT VSS VSSDL CK VDD F DQ6 G VDDQ H DQ4 J VDDL VREF K CKE L NC M A10 A1 A2 A0 VDD BA0 BA1 /CAS /CS /WE /RAS /CK ODT VSS VSSDL CK VDD VSSQ DQ3 DQ2 VSSQ DQ5 DQ1 VDDQ VDDQ DQ0 VDDQ VSSQ LDM LDQS VSSQ DQ7 VSSQ DQ3 DQ2 VSSQ DQ5 E VDD NC VSS VSSQ /LDQS VDDQ DQ1 VDDQ VDDQ DQ0 VDDQ D VSSQ DM/RDQS DQS VSSQ DQ7 C VDDQ DQ9 VDDQ VDDQ DQ8 VDDQ VSSQ /DQS VDDQ 2 3 7 8 9 A VDD B DQ14 VSSQ UDM UDQS VSSQ DQ15 NC VSS VSSQ /UDQS VDDQ 1 2 84-ball FBGA (x16 organization) 3 7 8 9
DQ12 VSSQ DQ11
DQ10 VSSQ DQ13
(Top view)
Pin name A0 to A12 BA0, BA1 DQ0 to DQ15 DQS, /DQS UDQS, /UDQS LDQS, /LDQS RDQS, /RDQS /CS /RAS, /CAS, /WE CKE CK, /CK DM UDM, LDM
Function Address inputs Bank select Data input/output Differential data strobe Differential data strobe for read Chip select Command input Clock enable Differential clock input Write data mask
Pin name ODT VDD VSS VDDQ VSSQ VREF VDDL VSSDL NC* NU*
1
Function ODT control Supply voltage for internal circuit Ground for internal circuit Supply voltage for DQ circuit Ground for DQ circuit Input reference voltage Supply voltage for DLL circuit Ground for DLL circuit No connection Not usable
2
Notes: 1. Not internally connected with die. 2. Don't use other than reserved functions.
Data Sheet E1175E20 (Ver. 2.0)
3
EDE2508AEBG, EDE2516AEBG
CONTENTS Specifications.................................................................................................................................................1 Features.........................................................................................................................................................1 Ordering Information......................................................................................................................................2 Part Number ..................................................................................................................................................2 Pin Configurations .........................................................................................................................................3 Electrical Specifications.................................................................................................................................5 Block Diagram .............................................................................................................................................24 Pin Function.................................................................................................................................................25 Command Operation ...................................................................................................................................27 Simplified State Diagram .............................................................................................................................35 Operation of DDR2 SDRAM ........................................................................................................................36 Package Drawing ........................................................................................................................................73 Recommended Soldering Conditions..........................................................................................................75
Data Sheet E1175E20 (Ver. 2.0)
4
EDE2508AEBG, EDE2516AEBG
Electrical Specifications
* All voltages are referenced to VSS (GND) * Execute power-up and Initialization sequence before proper device operation is achieved. Absolute Maximum Ratings
Parameter Power supply voltage Power supply voltage for output Power supply voltage for DLL Input voltage Output voltage Storage temperature Power dissipation Short circuit output current Symbol VDD VDDQ VDDL VIN VOUT Tstg PD IOUT Rating -1.0 to +2.3 -0.5 to +2.3 -0.5 to +2.3 -0.5 to +2.3 -0.5 to +2.3 -55 to +100 1.0 50 Unit V V V V V C W mA Notes 1 1 1 1 1 1, 2 1 1
Notes: 1. Stresses greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. Storage temperature is the case surface temperature on the center/top side of the DRAM. Caution Exposing the device to stress above those listed in Absolute Maximum Ratings could cause permanent damage. The device is not meant to be operated under conditions outside the limits described in the operational section of this specification. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.
Operating Temperature Condition
Parameter Operating case temperature Symbol TC Rating 0 to +95 Unit C Notes 1, 2
Notes: 1. Operating temperature is the case surface temperature on the center/top side of the DRAM. 2. Supporting 0C to +85C with full AC and DC specifications. Supporting 0C to +85C and being able to extend to +95C with doubling auto-refresh commands in frequency to a 32ms period (tREFI = 3.9s) and higher temperature Self-Refresh entry via A7 "1" on EMRS (2).
Data Sheet E1175E20 (Ver. 2.0)
5
EDE2508AEBG, EDE2516AEBG
Recommended DC Operating Conditions (SSTL_18)
Parameter Supply voltage Supply voltage for output Power supply voltage for DLL Input reference voltage Termination voltage DC input logic high DC input logic low AC input logic high AC input logic low Symbol VDD VDDQ VDDL VREF VTT VIH (DC) VIL (DC) VIH (AC) VIL (AC) min. 1.7 1.7 1.7 0.49 x VDDQ VREF - 0.04 VREF + 0.125 -0.3 VREF + 0.200 typ. 1.8 1.8 1.8 max. 1.9 1.9 1.9 Unit V V V V V V V V V Notes 4 4 4 1, 2 3
0.50 x VDDQ 0.51 x VDDQ VREF VREF + 0.04 VDDQ + 0.3 VREF - 0.125 VREF - 0.200
Notes: 1. The value of VREF may be selected by the user to provide optimum noise margin in the system. Typically the value of VREF is expected to be about 0.5 x VDDQ of the transmitting device and VREF are expected to track variations in VDDQ. 2. Peak to peak AC noise on VREF may not exceed 2% VREF (DC). 3. VTT of transmitting device must track VREF of receiving device. 4. VDDQ tracks with VDD, VDDL tracks with VDD. AC parameters are measured with VDD, VDDQ and VDDL tied together.
Data Sheet E1175E20 (Ver. 2.0)
6
EDE2508AEBG, EDE2516AEBG
AC Overshoot/Undershoot Specification
Parameter Maximum peak amplitude allowed for overshoot Maximum peak amplitude allowed for undershoot Maximum overshoot area above VDD DDR2-800 DDR2-667 Maximum undershoot area below VSS DDR2-800 DDR2-667 Maximum peak amplitude allowed for overshoot Maximum peak amplitude allowed for undershoot Maximum overshoot area above VDD DDR2-800, 667 Maximum undershoot area below VSS DDR2-800, 667 Maximum peak amplitude allowed for overshoot Maximum peak amplitude allowed for undershoot Maximum overshoot area above VDDQ DDR2-800, 667 Maximum undershoot area below VSSQ DDR2-800, 667 DQ, DQS, /DQS, UDQS, /UDQS, LDQS, /LDQS, RDQS, /RDQS, DM, UDM, LDM CK, /CK Pins Command, Address, CKE, ODT Specification 0.5 0.5 0.66 0.8 0.66 0.8 0.5 0.5 0.23 0.23 0.5 0.5 0.23 0.23 Unit V V V-ns V-ns V-ns V-ns V V V-ns V-ns V V V-ns V-ns
Maximum amplitude Overshoot area
Volts (V)
VDD, VDDQ VSS, VSSQ
Undershoot area
Time (ns)
Overshoot/Undershoot Definition
Data Sheet E1175E20 (Ver. 2.0)
7
EDE2508AEBG, EDE2516AEBG
DC Characteristics 1 (TC = 0C to +85C, VDD, VDDQ = 1.8V 0.1V)
x8 Parameter Symbol Grade max. x16 max. Unit Test condition one bank; tCK = tCK (IDD), tRC = tRC (IDD), tRAS = tRAS min.(IDD); CKE is H, /CS is H between valid commands; Address bus inputs are SWITCHING; Data bus inputs are SWITCHING one bank; IOUT = 0mA; BL = 4, CL = CL(IDD), AL = 0; tCK = tCK (IDD), tRC = tRC (IDD), tRAS = tRAS min.(IDD); tRCD = tRCD (IDD); CKE is H, /CS is H between valid commands; Address bus inputs are SWITCHING; Data pattern is same as IDD4W all banks idle; tCK = tCK (IDD); CKE is L; Other control and address bus inputs are STABLE; Data bus inputs are FLOATING all banks idle; tCK = tCK (IDD); CKE is H, /CS is H; Other control and address bus inputs are STABLE; Data bus inputs are FLOATING all banks idle; tCK = tCK (IDD); CKE is H, /CS is H; Other control and address bus inputs are SWITCHING; Data bus inputs are SWITCHING all banks open; tCK = tCK (IDD); CKE is L; Other control and address bus inputs are STABLE; Data bus inputs are FLOATING Fast PDN Exit MRS(12) = 0
Operating current (ACT-PRE)
IDD0
-8E -6E
55 50
55 50
mA
Operating current (ACT-READ-PRE)
IDD1
-8E -6E
65 60
65 60
mA
Precharge powerdown standby current
IDD2P
-8E -6E
4 4
4 4
mA
Precharge quiet standby current
IDD2Q
-8E -6E
12 12
12 12
mA
Idle standby current
IDD2N
-8E -6E
15 15
15 15
mA
IDD3P-F Active power-down standby current IDD3P-S
-8E -6E
15 15
15 15
mA
-8E -6E
12 12
12 12
mA
Slow PDN Exit MRS(12) = 1
Active standby current
IDD3N
-8E -6E
40 35
40 35
mA
Operating current (Burst read operating)
IDD4R
-8E -6E
135 125
150 135
mA
Operating current (Burst write operating)
IDD4W
-8E -6E
115 115
150 135
mA
all banks open; tCK = tCK (IDD), tRAS = tRAS max.(IDD), tRP = tRP (IDD); CKE is H, /CS is H between valid commands; Other control and address bus inputs are SWITCHING; Data bus inputs are SWITCHING all banks open, continuous burst reads, IOUT = 0mA; BL = 4, CL = CL(IDD), AL = 0; tCK = tCK (IDD), tRAS = tRAS max.(IDD), tRP = tRP (IDD); CKE is H, /CS is H between valid commands; Address bus inputs are SWITCHING; Data pattern is same as IDD4W all banks open, continuous burst writes; BL = 4, CL = CL(IDD), AL = 0; tCK = tCK (IDD), tRAS = tRAS max.(IDD), tRP = tRP (IDD); CKE is H, /CS is H between valid commands; Address bus inputs are SWITCHING; Data bus inputs are SWITCHING
Data Sheet E1175E20 (Ver. 2.0)
8
EDE2508AEBG, EDE2516AEBG
x8 Parameter Symbol Grade max. x16 max. Unit Test condition tCK = tCK (IDD); Refresh command at every tRFC (IDD) interval; CKE is H, /CS is H between valid commands; Other control and address bus inputs are SWITCHING; Data bus inputs are SWITCHING Self-Refresh Mode; CK and /CK at 0V; CKE 0.2V; Other control and address bus inputs are FLOATING; Data bus inputs are FLOATING all bank interleaving reads, IOUT = 0mA; BL = 4, CL = CL(IDD), AL = tRCD (IDD) -1 x tCK (IDD); tCK = tCK (IDD), tRC = tRC (IDD), tRRD = tRRD(IDD), tRCD = 1 x tCK (IDD); CKE is H, /CS is H between valid commands; Address bus inputs are STABLE during DESELECTs; Data pattern is same as IDD4W
Auto-refresh current IDD5
-8E -6E
90 85
90 85
mA
Self-refresh current
IDD6*
7
4
4
mA
Operating current (Bank interleaving)
IDD7
-8E -6E
155 155
165 160
mA
Notes: 1. 2. 3. 4.
IDD specifications are tested after the device is properly initialized. Input slew rate is specified by AC Input Test Condition. IDD parameters are specified with ODT disabled. Data bus consists of DQ, DM, DQS, /DQS, RDQS and /RDQS. IDD values must be met with all combinations of EMRS bits 10 and 11. 5. Definitions for IDD L is defined as VIN VIL (AC) (max.) H is defined as VIN VIH (AC) (min.) STABLE is defined as inputs stable at an H or L level FLOATING is defined as inputs at VREF = VDDQ/2 SWITCHING is defined as: inputs changing between H and L every other clock cycle (once per two clocks) for address and control signals, and inputs changing between H and L every other data transfer (once per clock) for DQ signals not including masks or strobes. 6. Refer to AC Timing for IDD Test Conditions. 7. When TC +85C, IDD6 must be derated by 80%. IDD6 will increase by this amount, if TC +85C and double refresh option is still enabled.
AC Timing for IDD Test Conditions For purposes of IDD testing, the following parameters are to be utilized.
DDR2-800 Parameter CL (IDD) tRCD (IDD) tRC (IDD) tRRD (IDD) tCK (IDD) tRAS (min.)(IDD) tRAS (max.)(IDD) tRP (IDD) tRFC (IDD) 5-5-5 5 12.5 57.5 7.5 2.5 45 70000 12.5 75 DDR2-667 5-5-5 5 15 60 7.5 3 45 70000 15 75 Unit tCK ns ns ns ns ns ns ns ns
Data Sheet E1175E20 (Ver. 2.0)
9
EDE2508AEBG, EDE2516AEBG
DC Characteristics 2 (TC = 0C to +85C, VDD, VDDQ = 1.8V 0.1V)
Parameter Input leakage current Output leakage current Symbol ILI ILO Value 2 5 VTT + 0.603 VTT - 0.603 0.5 x VDDQ +13.4 -13.4 Unit A A V V V mA mA Notes VDD VIN VSS VDDQ VOUT VSS 5 5 1 3, 4, 5 2, 4, 5
Minimum required output pull-up under AC VOH test load Maximum required output pull-down under VOL AC test load Output timing measurement reference level VOTR Output minimum sink DC current Output minimum source DC current IOL IOH
Notes: 1. 2. 3. 4. 5.
The VDDQ of the device under test is referenced. VDDQ = 1.7V; VOUT = 1.42V. VDDQ = 1.7V; VOUT = 0.28V. The DC value of VREF applied to the receiving device is expected to be set to VTT. After OCD calibration to 18 at TC = 25C, VDD = VDDQ = 1.8V.
DC Characteristics 3 (TC = 0C to +85C, VDD, VDDQ = 1.8V 0.1V)
Parameter AC differential input voltage AC differential cross point voltage AC differential cross point voltage Symbol VID (AC) VIX (AC) VOX (AC) min. 0.5 0.5 x VDDQ - 0.175 0.5 x VDDQ - 0.125 max. VDDQ + 0.6 0.5 x VDDQ + 0.175 0.5 x VDDQ + 0.125 Unit V V V Notes 1, 2 2 3
Notes: 1. VID (AC) specifies the input differential voltage |VTR -VCP| required for switching, where VTR is the true input signal (such as CK, DQS, RDQS) and VCP is the complementary input signal (such as /CK, /DQS, /RDQS). The minimum value is equal to VIH (AC) - VIL (AC). 2. The typical value of VIX (AC) is expected to be about 0.5 x VDDQ of the transmitting device and VIX (AC) is expected to track variations in VDDQ. VIX (AC) indicates the voltage at which differential input signals must cross. 3. The typical value of VOX (AC) is expected to be about 0.5 x VDDQ of the transmitting device and VOX (AC) is expected to track variations in VDDQ. VOX (AC) indicates the voltage at which differential output signals must cross.
VDDQ VTR
VID
VCP VSSQ
Crossing point
VIX or VOX
Differential Signal Levels*1, 2
Data Sheet E1175E20 (Ver. 2.0)
10
EDE2508AEBG, EDE2516AEBG
ODT DC Electrical Characteristics (TC = 0C to +85C, VDD, VDDQ = 1.8V 0.1V)
Parameter Rtt effective impedance value for EMRS (A6, A2) = 0, 1; 75 Rtt effective impedance value for EMRS (A6, A2) = 1, 0; 150 Rtt effective impedance value for EMRS (A6, A2) = 1, 1; 50 Deviation of VM with respect to VDDQ/2 Symbol Rtt1 (eff) Rtt2 (eff) Rtt3 (eff) VM min 60 120 40 -6 typ 75 150 50 max 90 180 60 +6 Unit % Note 1 1 1 1
Note: 1. Test condition for Rtt measurements. Measurement Definition for Rtt (eff) Apply VIH (AC) and VIL (AC) to test pin separately, then measure current I(VIH(AC)) and I(VIL(AC)) respectively. VIH(AC), and VDDQ values defined in SSTL_18.
Rtt (eff ) =
VIH ( AC ) - VIL( AC ) I (VIH ( AC )) - I (VIL( AC ))
Measurement Definition for VM Measure voltage (VM) at test pin (midpoint) with no load.
2 x VM - 1 x 100 VM = VDDQ
OCD Default Characteristics (TC = 0C to +85C, VDD, VDDQ = 1.8V 0.1V)
Parameter Output impedance Pull-up and pull-down mismatch Output slew rate min 12.6 0 1.5 typ 18 max 23.4 4 5 Unit V/ns Notes 1, 5 1, 2 3, 4
Notes: 1. Impedance measurement condition for output source DC current: VDDQ = 1.7V; VOUT = 1420mV; (VOUT-VDDQ)/IOH must be less than 23.4 for values of VOUT between VDDQ and VDDQ-280mV. Impedance measurement condition for output sink DC current: VDDQ = 1.7V; VOUT = 280mV; VOUT/IOL must be less than 23.4 for values of VOUT between 0V and 280mV. 2. Mismatch is absolute value between pull up and pull down, both are measured at same temperature and voltage. 3. Slew rate measured from VIL (AC) to VIH (AC). 4. The absolute value of the slew rate as measured from DC to DC is equal to or greater than the slew rate as measured from AC to AC. This is guaranteed by design and characterization. 5. DRAM I/O specifications for timing, voltage, and slew rate are no longer applicable if OCD is changed from default settings.
Data Sheet E1175E20 (Ver. 2.0)
11
EDE2508AEBG, EDE2516AEBG
Pin Capacitance (TA = 25C, VDD, VDDQ = 1.8V 0.1V)
Parameter CLK input pin capacitance Input pin capacitance -8E -6E Symbol CCK Pins CK, /CK /RAS, /CAS, /WE, /CS, CKE, ODT, Address DQ, DQS, /DQS, UDQS, /UDQS, LDQS, /LDQS, RDQS, /RDQS, DM, UDM, LDM min. 1.0 1.0 1.0 max. 2.0 1.75 2.0 Unit pF pF pF Notes 1 1 1
CIN
Input/output pin capacitance
CI/O
2.5
3.5
pF
2
Notes: 1. Matching within 0.25pF. 2. Matching within 0.50pF.
Data Sheet E1175E20 (Ver. 2.0)
12
EDE2508AEBG, EDE2516AEBG
AC Characteristics (TC = 0C to +85C, VDD, VDDQ = 1.8V 0.1V, VSS, VSSQ = 0V) [DDR2-800, 667] New units tCK(avg) and nCK, are introduced in DDR2-800 and DDR2-667 tCK(avg): actual tCK(avg) of the input clock under operation. nCK: one clock cycle of the input clock, counting the actual clock edges.
-8E Speed bin Parameter Active to read or write command delay Precharge command period Symbol tRCD tRP DDR2-800 (5-5-5) min. 12.5 12.5 57.5 -400 -350 max. +400 +350 0.52 0.52 -6E DDR2-667 (5-5-5) min. 15 15 60 -450 -400 0.48 0.48 max. +450 +400 0.52 0.52 Unit ns ns ns ps ps 10 10 Notes
Active to active/auto-refresh command time tRC DQ output access time from CK, /CK DQS output access time from CK, /CK CK high-level width CK low-level width CK half period Clock cycle time (CL = 6) (CL = 5) (CL = 4) (CL = 3) DQ and DM input hold time DQ and DM input setup time Control and Address input pulse width for each input tAC tDQSCK
tCH (avg) 0.48 tCL(avg) tHP tCK (avg) tCK (avg) tCK (avg) tCK (avg) 0.48
tCK (avg) 13 tCK (avg) 13 ps ps ps ps ps ps ps tCK (avg) tCK (avg) 10 10 10 6, 13 13 13 13 13 5 4
Min. (tCL(abs), tCH(abs)) 2500 2500 3750 5000 8000 8000 8000 8000 tAC max. tAC max. tAC max. 200 300 +0.25 0.6 1.1 0.6 70000
Min.(tCL(abs), tCH(abs)) 3000 3000 3750 5000 175 100 0.6 0.35 tAC min. 2 x tAC min. tHP - tQHS -0.25 0.35 0.35 0.2 0.2 2 0.4 0.35 275 200 0.9 0.4 45 8000 8000 8000 8000
tDH (base) 125 tDS (base) 50 tIPW 0.6 0.35
DQ and DM input pulse width for each input tDIPW Data-out high-impedance time from CK,/CK tHZ DQS, /DQS low-impedance time from CK,/CK DQ low-impedance time from CK,/CK
tAC max. ps tAC max. ps tAC max. ps 240 340 +0.25 0.6 1.1 0.6 70000 ps ps ps tCK (avg) tCK (avg) tCK (avg) tCK (avg) tCK (avg) nCK tCK (avg) tCK (avg) ps ps
tLZ (DQS) tAC min. tLZ (DQ) 2 x tAC min. tHP - tQHS -0.25 0.35 0.35 0.2 0.2 2 0.4 0.35
DQS-DQ skew for DQS and associated DQ tDQSQ signals DQ hold skew factor DQ/DQS output hold time from DQS tQHS tQH
7 8
DQS latching rising transitions to associated tDQSS clock edges DQS input high pulse width DQS input low pulse width DQS falling edge to CK setup time DQS falling edge hold time from CK Mode register set command cycle time Write postamble Write preamble Address and control input hold time Address and control input setup time Read preamble Read postamble Active to precharge command tDQSH tDQSL tDSS tDSH tMRD tWPST tWPRE
tIH (base) 250 tIS (base) 175 tRPRE tRPST tRAS 0.9 0.4 45
5 4
tCK (avg) 11 tCK (avg) 12 ns
Data Sheet E1175E20 (Ver. 2.0)
13
EDE2508AEBG, EDE2516AEBG
-8E Speed bin Parameter Active to auto-precharge delay Active bank A to active bank B command period /CAS to /CAS command delay Write recovery time Auto precharge write recovery + precharge time Internal write to read command delay Internal read to precharge command delay Exit self-refresh to a non-read command Exit self-refresh to a read command Symbol tRAP tRRD tCCD tWR tDAL tWTR tRTP tXSNR tXSRD DDR2-800 (5-5-5) min. tRCD min. 7.5 2 15 max. -6E DDR2-667 (5-5-5) min. tRCD min. 7.5 2 15 max. Unit ns ns nCK ns nCK ns ns ns nCK nCK nCK nCK nCK ns ns ns s s ns 3 2, 3 1, 9 14 Notes
WR + RU (tRP/tCK(avg)) 7.5 7.5 tRFC + 10 200 2 2 8 - AL 3 0 0 75 12 12 7.8 3.9
WR + RU (tRP/tCK(avg)) 7.5 7.5 tRFC + 10 200 2 2 7 - AL 3 0 0 75 12 12 7.8 3.9
Exit precharge power down to any non-read tXP command Exit active power down to read command Exit active power down to read command (slow exit/low power mode) CKE minimum pulse width (high and low pulse width) Output impedance test driver delay MRS command to ODT update delay Auto-refresh to active/auto-refresh command time Average periodic refresh interval (0C TC +85C) (+85C < TC +95C) tXARD tXARDS tCKE tOIT
tMOD
tRFC tREFI tREFI
Minimum time clocks remains ON after CKE tDELAY asynchronously drops low
tIS + tCK(avg) + tIH
tIS + tCK(avg) + tIH
Notes: 1. 2. 3. 4.
For each of the terms above, if not already an integer, round to the next higher integer. AL: Additive Latency. MRS A12 bit defines which active power-down exit timing to be applied. The figures of Input Waveform Timing 1 and 2 are referenced from the input signal crossing at the VIH(AC) level for a rising signal and VIL(AC) for a falling signal applied to the device under test. 5. The figures of Input Waveform Timing 1 and 2 are referenced from the input signal crossing at the VIL(DC) level for a rising signal and VIH(DC) for a falling signal applied to the device under test.
CK /CK
DQS /DQS
tIS
tIH
tIS
tIH VDDQ VIH (AC)(min.) VIH (DC)(min.) VREF VIL (DC)(max.) VIL (AC)(max.) VSS
tDS
tDH
tDS
tDH VDDQ VIH (AC)(min.) VIH (DC)(min.) VREF VIL (DC)(max.) VIL (AC)(max.) VSS
Input Waveform Timing 1 (tDS, tDH)
Input Waveform Timing 2 (tIS, tIH)
Data Sheet E1175E20 (Ver. 2.0)
14
EDE2508AEBG, EDE2516AEBG
6. tHP is the minimum of the absolute half period of the actual input clock. tHP is an input parameter but not an input specification parameter. It is used in conjunction with tQHS to derive the DRAM output timing tQH. The value to be used for tQH calculation is determined by the following equation; tHP = min ( tCH(abs), tCL(abs) ), where, tCH(abs) is the minimum of the actual instantaneous clock high time; tCL(abs) is the minimum of the actual instantaneous clock low time; 7. tQHS accounts for: a. The pulse duration distortion of on-chip clock circuits, which represents how well the actual tHP at the input is transferred to the output; and b. The worst case push-out of DQS on one transition followed by the worst case pull-in of DQ on the next transition, both of which are independent of each other, due to data pin skew, output pattern effects, and p-channel to n-channel variation of the output drivers. 8. tQH = tHP - tQHS, where: tHP is the minimum of the absolute half period of the actual input clock; and tQHS is the specification value under the max column. {The less half-pulse width distortion present, the larger the tQH value is; and the larger the valid data eye will be.} Examples: a. If the system provides tHP of 1315ps into a DDR2-667 SDRAM, the DRAM provides tQH of 975ps (min.) b. If the system provides tHP of 1420ps into a DDR2-667 SDRAM, the DRAM provides tQH of 1080ps (min.) 9. RU stands for round up. WR refers to the tWR parameter stored in the MRS. 10. When the device is operated with input clock jitter, this parameter needs to be derated by the actual tERR(6-10per) of the input clock. (output deratings are relative to the SDRAM input clock.) For example, if the measured jitter into a DDR2-667 SDRAM has tERR(6-10per) min. = -272ps and tERR(6-10per) max. = +293ps, then tDQSCK min.(derated) = tDQSCK min. - tERR(6-10per) max. = -400ps - 293ps = -693ps and tDQSCK max.(derated) = tDQSCK max. - tERR(6-10per) min. = 400ps + 272ps = +672ps. Similarly, tLZ(DQ) for DDR2-667 derates to tLZ(DQ) min.(derated) = -900ps - 293ps = -1193ps and tLZ(DQ) max.(derated)= 450ps + 272ps = +722ps. 11. When the device is operated with input clock jitter, this parameter needs to be derated by the actual tJIT(per) of the input clock. (output deratings are relative to the SDRAM input clock.) For example, if the measured jitter into a DDR2-667 SDRAM has tJIT(per) min. = -72ps and tJIT(per) max. = +93ps, then tRPRE min.(derated) = tRPRE min. + tJIT(per) min. = 0.9 x tCK(avg) - 72ps = +2178ps and tRPRE max.(derated) = tRPRE max. + tJIT(per) max. = 1.1 x tCK(avg) + 93ps = +2843ps. 12. When the device is operated with input clock jitter, this parameter needs to be derated by the actual tJIT(duty) of the input clock. (output deratings are relative to the SDRAM input clock.) For example, if the measured jitter into a DDR2-667 SDRAM has tJIT(duty) min. = -72ps and tJIT(duty) max. = +93ps, then tRPST min.(derated) = tRPST min. + tJIT(duty) min. = 0.4 x tCK(avg) - 72ps = +928ps and tRPST max.(derated) = tRPST max. + tJIT(duty) max. = 0.6 x tCK(avg) + 93ps = +1592ps. 13. Refer to the Clock Jitter table. 14. tWTR is at least two clocks (2 x tCK or 2 x nCK) independent of operation frequency.
Data Sheet E1175E20 (Ver. 2.0)
15
EDE2508AEBG, EDE2516AEBG
ODT AC Electrical Characteristics
Parameter ODT turn-on delay ODT turn-on ODT turn-on (power-down mode) ODT turn-off delay ODT turn-off ODT turn-off (power-down mode) ODT to power-down entry latency ODT power-down exit latency Symbol tAOND tAON tAONPD tAOFD tAOF tAOFPD tANPD tAXPD min 2 tAC (min) tAC(min) + 2000 2.5 tAC(min) tAC(min) + 2000 3 8 max 2 tAC (max) + 700 2tCK + tAC(max) + 1000 2.5 tAC(max) + 600 2.5tCK + tAC(max) + 1000 3 8 Unit tCK ps ps tCK ps ps tCK tCK 5 2, 4, 5 1, 3 Notes
Notes: 1. ODT turn on time min is when the device leaves high impedance and ODT resistance begins to turn on. ODT turn on time max is when the ODT resistance is fully on. Both are measured from tAOND. 2. ODT turn off time min is when the device starts to turn off ODT resistance. ODT turn off time max is when the bus is in high impedance. Both are measured from tAOFD. 3. When the device is operated with input clock jitter, this parameter needs to be derated by the actual tERR(6-10per) of the input clock. (output deratings are relative to the SDRAM input clock.) 4. When the device is operated with input clock jitter, this parameter needs to be derated by {-tJIT(duty) max. - tERR(6-10per) max. } and { -tJIT(duty) min. - tERR(6-10per) min. } of the actual input clock.(output deratings are relative to the SDRAM input clock.) For example, if the measured jitter into a DDR2-667 SDRAM has tERR(6-10per) min. = -272ps, tERR(6-10per) max. = +293ps, tJIT(duty) min. = -106ps and tJIT(duty) max. = +94ps, then tAOF min.(derated) = tAOF min. + { -tJIT(duty) max. - tERR(6-10per) max. } = -450ps + { -94ps - 293ps} = -837ps and tAOF max.(derated) = tAOF max. + { -tJIT(duty) min. - tERR(6-10per) min. } = 1050ps + { 106ps + 272ps} = +1428ps. 5. For tAOFD of DDR2-667/800, the 1/2 clock of nCK in the 2.5 x nCK assumes a tCH(avg), average input clock high pulse width of 0.5 relative to tCK(avg). tAOF min. and tAOF max. should each be derated by the same amount as the actual amount of tCH(avg) offset present at the DRAM input with respect to 0.5. For example, if an input clock has a worst case tCH(avg) of 0.48, the tAOF min. should be derated by subtracting 0.02 x tCK(avg) from it, whereas if an input clock has a worst case tCH(avg) of 0.52, the tAOF max. should be derated by adding 0.02 x tCK(avg) to it. Therefore, we have; tAOF min.(derated) = tAC min. - [0.5 - Min.(0.5, tCH(avg) min.)] x tCK(avg) tAOF max.(derated) = tAC max. + 0.6 + [Max.(0.5, tCH(avg) max.) - 0.5] x tCK(avg) or tAOF min.(derated) = Min.(tAC min., tAC min. - [0.5 - tCH(avg) min.] x tCK(avg)) tAOF max.(derated) = 0.6 + Max.(tAC max., tAC max. + [tCH(avg) max. - 0.5] x tCK(avg)) where tCH(avg) min. and tCH(avg) max. are the minimum and maximum of tCH(avg) actually measured at the DRAM input balls.
Data Sheet E1175E20 (Ver. 2.0)
16
EDE2508AEBG, EDE2516AEBG
AC Input Test Conditions
Parameter Input reference voltage Input signal maximum peak to peak swing Input signal minimum slew rate Symbol VREF VSWING (max.) SLEW Value 0.5 x VDDQ 1.0 1.0 Unit V V V/ns Notes 1 1 2, 3
Notes: 1. Input waveform timing is referenced to the input signal crossing through the VIH/IL (AC) level applied to the device under test. 2. The input signal minimum slew rate is to be maintained over the range from VREF to VIH (AC) min. for rising edges and the range from VREF to VIL (AC) max. for falling edges as shown in the below figure. 3. AC timings are referenced with input waveforms switching from VIL (AC) to VIH (AC) on the positive transitions and VIH (AC) to VIL (AC) on the negative transitions.
VDDQ VIH (AC)(min.) VIH (DC)(min.) VSWING(max.) VREF VIL (DC)(max.) VIL (AC)(max.) TF Falling slew = VREF TR Rising slew = VSS VIH (AC) min. - VREF TR
- VIL (AC)(max.)
TF
AC Input Test Signal Wave forms
Measurement point DQ RT =25 VTT
Output Load
Data Sheet E1175E20 (Ver. 2.0)
17
EDE2508AEBG, EDE2516AEBG
Clock Jitter [DDR2-800, 667]
-8E Frequency (Mbps) Parameter Average clock period Clock period jitter Clock period jitter during DLL locking period Cycle to cycle period jitter Cycle to cycle clock period jitter during DLL locking period Cumulative error across 2 cycles Cumulative error across 3 cycles Cumulative error across 4 cycles Cumulative error across 5 cycles Cumulative error across n=6,7,8,9,10 cycles Cumulative error across n=11, 12,...49,50 cycles Average high pulse width Average low pulse width Duty cycle jitter Symbol tCK (avg) tJIT (per) tJIT (per, lck) tJIT (cc) 800 min. 2500 -100 -80 max. 8000 100 80 200 160 150 175 200 200 300 450 0.52 0.52 100 -6E 667 min. 3000 -125 -100 -175 -225 -250 -250 -350 -450 0.48 0.48 -125 max. 8000 125 100 250 200 175 225 250 250 350 450 0.52 0.52 125 Unit ps ps ps ps ps ps ps ps ps ps ps tCK (avg) tCK (avg) ps Notes 1 5 5 6 6 7 7 7 7 7 7 2 3 4
tJIT (cc, lck) tERR (2per) -150 tERR (3per) -175 tERR (4per) -200 tERR (5per) -200 tERR (6-10per) tERR (11-50per) tCH (avg) tCL (avg) tJIT (duty) -300 -450 0.48 0.48 -100
Notes: 1. tCK (avg) is calculated as the average clock period across any consecutive 200cycle window.
N tCK (avg ) = tCKj N j =1
N = 200 2. tCH (avg) is defined as the average high pulse width, as calculated across any consecutive 200 high pulses.
N tCH (avg ) = tCHj (N x tCK (avg )) j =1
N = 200 3. tCL (avg) is defined as the average low pulse width, as calculated across any consecutive 200 low pulses.
N tCL(avg ) = tCLj (N x tCK (avg )) j =1
N = 200 4. tJIT (duty) is defined as the cumulative set of tCH jitter and tCL jitter. tCH jitter is the largest deviation of any single tCH from tCH (avg). tCL jitter is the largest deviation of any single tCL from tCL (avg). tJIT (duty) is not subject to production test. tJIT (duty) = Min./Max. of {tJIT (CH), tJIT (CL)}, where: tJIT (CH) = {tCHj- tCH (avg) where j = 1 to 200} tJIT (CL) = {tCLj - tCL (avg) where j = 1 to 200} 5. tJIT (per) is defined as the largest deviation of any single tCK from tCK (avg). tJIT (per) = Min./Max. of { tCKj - tCK (avg) where j = 1 to 200} tJIT (per) defines the single period jitter when the DLL is already locked. tJIT (per, lck) uses the same definition for single period jitter, during the DLL locking period only. tJIT (per) and tJIT (per, lck) are not subject to production test.
Data Sheet E1175E20 (Ver. 2.0)
18
EDE2508AEBG, EDE2516AEBG
6. tJIT (cc) is defined as the absolute difference in clock period between two consecutive clock cycles: tJIT (cc) = Max. of |tCKj+1 - tCKj| tJIT (cc) is defines the cycle to cycle jitter when the DLL is already locked. tJIT (cc, lck) uses the same definition for cycle to cycle jitter, during the DLL locking period only. tJIT (cc) and tJIT (cc, lck) are not subject to production test. 7. tERR (nper) is defined as the cumulative error across multiple consecutive cycles from tCK (avg). tERR (nper) is not subject to production test.
n tERR(nper ) = tCKj - n x tCK(avg )) j =1
2 n 50 for tERR (nper) 8. These parameters are specified per their average values, however it is understood that the following relationship between the average timing and the absolute instantaneous timing hold at all times. (minimum and maximum of spec values are to be used for calculations in the table below.)
Parameter Absolute clock period Absolute clock high pulse width Absolute clock low pulse width Symbol tCK (abs) tCH (abs) tCL (abs) min. tCK (avg) min. + tJIT (per) min. tCH (avg) min. x tCK (avg) min. + tJIT (duty) min. tCL (avg) min. x tCK (avg) min. + tJIT (duty) min. max. Unit tCK (avg) max. + tJIT (per) max. ps tCH (avg) max. x tCK (avg) max. ps + tJIT (duty) max. tCL (avg) max. x tCK (avg) max. ps + tJIT (duty) max.
Example: For DDR2-667, tCH(abs) min. = ( 0.48 x 3000 ps ) - 125ps = 1315ps
Data Sheet E1175E20 (Ver. 2.0)
19
EDE2508AEBG, EDE2516AEBG
Input Slew Rate Derating For all input signals the total tIS, tDS (setup time) and tIH, tDH (hold time) required is calculated by adding the data sheet tIS (base), tDS (base) and tIH (base), tDH (base) value to the tIS, tDS and tIH, tDH derating value respectively. Example: tDS (total setup time) = tDS (base) + tDS. Setup (tIS, tDS) nominal slew rate for a rising signal is defined as the slew rate between the last crossing of VREF (DC) and the first crossing of VIH (AC) min. Setup (tIS, tDS) nominal slew rate for a falling signal is defined as the slew rate between the last crossing of VREF (DC) and the first crossing of VIL (AC) max. If the actual signal is always earlier than the nominal slew rate line between shaded `VREF (DC) to AC region', use nominal slew rate for derating value (See the figure of Slew Rate Definition Nominal). If the actual signal is later than the nominal slew rate line anywhere between shaded `VREF (DC) to AC region', the slew rate of a tangent line to the actual signal from the AC level to DC level is used for derating value (see the figure of Slew Rate Definition Tangent). Hold (tIH, tDH) nominal slew rate for a rising signal is defined as the slew rate between the last crossing of VIL (DC) max. and the first crossing of VREF (DC). Hold (tIH, tDH) nominal slew rate for a falling signal is defined as the slew rate between the last crossing of VIH (DC) min. and the first crossing of VREF (DC). If the actual signal is always later than the nominal slew rate line between shaded `DC level to VREF (DC) region', use nominal slew rate for derating value (See the figure of Slew Rate Definition Nominal). If the actual signal is earlier than the nominal slew rate line anywhere between shaded `DC to VREF (DC) region', the slew rate of a tangent line to the actual signal from the DC level to VREF (DC) level is used for derating value (see the figure of Slew Rate Definition Tangent). Although for slow slew rates the total setup time might be negative (i.e. a valid input signal will not have reached VIH/IL (AC) at the time of the rising clock transition) a valid input signal is still required to complete the transition and reach VIH/IL (AC). For slew rates in between the values listed in the tables below, the derating values may obtained by linear interpolation. These values are typically not subject to production test. They are verified by design and characterization.
[Derating Values of tDS/tDH with Differential DQS (DDR2-667, 800)
DQS, /DQS differential slew rate 4.0 V/ns 3.0 V/ns 2.0 V/ns 1.8 V/ns 1.6 V/ns 1.4 V/ns 1.2 V/ns 1.0 V/ns 0.8 V/ns
tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH Unit 2.0 1.5 1.0 DQ slew rate (V/ns) 0.9 0.8 0.7 0.6 0.5 0.4 +100 +45 +67 0 +21 0 +100 +45 +67 0 -5 +21 0 -14 +100 +45 +67 0 -5 -13 +21 0 -14 -31 +79 +12 +7 -1 -10 +33 +12 -2 -19 -42 +24 +19 +11 +2 -10 +24 +10 -7 -30 -59 +31 +23 +14 +2 -24 +22 +5 -18 -47 -89 +35 +26 +14 -12 -52 +17 -6 -35 -77 +38 +26 0 +6 -23 -65 +38 +12 -11 -53 ps ps ps ps ps ps ps ps
-140 -40
-128 -28
-116 ps
Data Sheet E1175E20 (Ver. 2.0)
20
EDE2508AEBG, EDE2516AEBG
[Derating Values of tIS/tIH (DDR2-667, DDR2-800)]
CK, /CK Differential Slew Rate 2.0 V/ns tIS 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.9 Command/address slew rate (V/ns) 0.8 0.7 0.6 0.5 0.4 0.3 0.25 0.2 0.15 0.1 +150 +143 +133 +120 +100 +67 0 -5 -13 -22 -34 -60 -100 -168 -200 -325 -517 -1000 tIH +94 +89 +83 +75 +45 +21 0 -14 -31 -54 -83 -125 -188 -292 -375 -500 -708 -1125 1.5 V/ns tIS +180 +173 +163 +150 +130 +97 +30 +25 +17 +8 -4 -30 -70 -138 -170 -295 -487 -970 tIH +124 +119 +113 +105 +75 +51 +30 +16 -1 -24 -53 -95 -158 -262 -345 -470 -678 -1095 1.0 V/ns tIS +210 +203 +193 +180 +160 +127 +60 +55 +47 +38 +26 0 -40 -108 -140 -265 -457 -940 tIH +154 +149 +143 +135 +105 +81 +60 +46 +29 +6 -23 -65 -128 -232 -315 -440 -648 -1065 Unit ps ps ps ps ps ps ps ps ps ps ps ps ps ps ps ps ps ps Notes
Data Sheet E1175E20 (Ver. 2.0)
21
EDE2508AEBG, EDE2516AEBG
Single-ended DQS
VDDQ VIH (AC) min. VIH (DC) min. VREF (DC) VIL (DC) max. VIL (AC) max. VSS
DQS
Differential DQS, /DQS CK, /CK DQS CK /DQS /CK
tDS1
tDH1
tDS1
tDH1
tDS tIS VDD
tDH tIH
tDS tIS
tDH tIH
VIH (AC) min. VREF to AC region VIH (DC) min. DC to VREF region nominal slew rate nominal slew rate DC to VREF region
VREF (DC)
VIL (DC) max.
VIL (AC) max.
VREF to AC region
VSS TFS TRH TRS TFH
VREF (DC) - VIL (AC) max. Setup slew rate = Falling signal
TFS
VIH (AC) min. - VREF (DC) Setup slew rate = Rising signal
TRS
Hold slew rate Rising signal
=
VREF (DC) - VIL (DC) max.
TRH
Hold slew rate Falling signal
=
VIH (DC) min. - VREF (DC)
TFH
Slew Rate Definition Nominal
Data Sheet E1175E20 (Ver. 2.0)
22
EDE2508AEBG, EDE2516AEBG
Single-ended DQS
VDDQ VIH (AC) min. VIH (DC) min. VREF (DC) VIL (DC) max. VIL (AC) max. VSS
DQS
Differential DQS, /DQS CK, /CK DQS CK /DQS /CK
tDS1
tDH1
tDS1
tDH1
tDS tIS VDD
tDH tIH
tDS tIS
tDH tIH
VIH (AC) min. VREF to AC region VIH (DC) min. DC to VREF region tangent line nominal line nominal line
VREF (DC)
tangent line DC to VREF region
VIL (DC) max. nominal line VIL (AC) max.
nominal line
VREF to AC region
VSS TFS TRH TRS TFH
tangent line [VREF (DC) - VIL (AC) max.] Setup slew rate = Falling signal
TFS
tangent line [VIH (AC) min. - VREF (DC)] Setup slew rate = Rising signal
TRS
Hold slew rate Rising signal
=
tangent line [VREF (DC) - VIL (DC) max.]
TRH
Hold slew rate Falling signal
=
tangent line [VIH (DC) min. - VREF (DC)]
TFH
Slew Rate Definition Tangent
Data Sheet E1175E20 (Ver. 2.0)
23
EDE2508AEBG, EDE2516AEBG
Block Diagram
Clock generator
CK /CK CKE
Bank 3 Bank 2 Bank 1
A0 to A12, BA0, BA1
Mode register
Row address buffer and refresh counter
Row decoder
Memory cell array Bank 0
Sense amp.
Command decoder
/CS /RAS /CAS /WE
Column address buffer and burst counter
Column decoder
Control logic
Data control circuit
Latch circuit
DQS, /DQS
CK, /CK
DLL
Input & Output buffer
RDQS, /RDQS ODT
DM
DQ
Data Sheet E1175E20 (Ver. 2.0)
24
EDE2508AEBG, EDE2516AEBG
Pin Function
CK, /CK (input pins) CK and /CK are differential clock inputs. All address and control input signals are sampled on the crossing of the positive edge of CK and negative edge of /CK. Output (read) data is referenced to the crossings of CK and /CK (both directions of crossing). /CS (input pin) All commands are masked when /CS is registered high. /CS provides for external rank selection on systems with multiple ranks. /CS is considered part of the command code. /RAS, /CAS, /WE (input pins) /RAS, /CAS and /WE (along with /CS) define the command being entered. A0 to A12 (input pins) Provided the row address for Active commands and the column address and Auto Precharge bit for Read/Write commands to select one location out of the memory array in the respective bank. The address inputs also provide the op-code during mode register set commands. [Address Pins Table]
Address (A0 to A12) Part number EDE2508AEBG EDE2516AEBG Row address AX0 to AX12 AX0 to AX12 Column address AY0 to AY9 AY0 to AY8 Note
A10 (AP) (input pin) A10 is sampled during a precharge command to determine whether the precharge applies to one bank (A10 = low) or all banks (A10 = high). If only one bank is to be precharged, the bank is selected by BA0, BA1. BA0, BA1 (input pins) BA0 and BA1 define to which bank an active, read, write or precharge command is being applied. BA0 also determines if the mode register or extended mode register is to be accessed during a MRS or EMRS (1), EMRS (2) cycle. [Bank Select Signal Table]
BA0 Bank 0 Bank 1 Bank 2 Bank 3 L H L H BA1 L L H H
Remark: H: VIH. L: VIL. CKE (input pin) CKE high activates, and CKE low deactivates, internal clock signals and device input buffers and output drivers. Taking CKE low provides precharge power-down and Self-Refresh operation (all banks idle), or active power-down (row active in any bank). CKE is synchronous for power-down entry and exit, and for self-refresh entry. CKE is asynchronous for self-refresh exit. CKE must be maintained high throughout read and write accesses. Input buffers, excluding CK, /CK and CKE are disabled during power-down. Input buffers, excluding CKE, are disabled during selfrefresh.
Data Sheet E1175E20 (Ver. 2.0)
25
EDE2508AEBG, EDE2516AEBG
DM, UDM and LDM (input pins) DM is an input mask signal for write data. Input data is masked when DM is sampled high coincident with that input data during a Write access. DM is sampled on both edges of DQS. Although DM pins are input only, the DM loading matches the DQ and DQS loading. For x8 configuration, DM function will be disabled when RDQS function is enabled by EMRS. In x 16 configuration, UDM controls upper byte (DQ8 to DQ15) and LDM controls lower byte (DQ0 to DQ7). In this datasheet, DM represents UDM and LDM. DQ (input/output pins) Bi-directional data bus. DQS, /DQS UDQS, /UDQS, LDQS, /LDQS (input/output pins) Output with read data, input with write data for source synchronous operation. Edge-aligned with read data, centered in write data. Used to capture write data. /DQS can be disabled by EMRS. In x 16 configuration, UDQS, /UDQS and LDQS, /LDQS control upper byte (DQ8 to DQ15) and lower byte (DQ0 to DQ7). In this datasheet, DQS represents UDQS and LDQS, /DQS represents /UDQS and /LDQS. RDQS, /RDQS (output pins) Differential Data Strobe for READ operation only. DM and RDQS functions are switch able by EMRS. These pins exist only in x8 configuration. /RDQS output will be disabled when /DQS is disabled by EMRS.
ODT (input pins) ODT (On Die Termination control) is a registered high signal that enables termination resistance internal to the DDR2 SDRAM. When enabled, ODT is only applied to each DQ, DQS, /DQS, RDQS, /RDQS, and DM signal for x 8 configurations. For x 16 configuration, ODT is applied to each DQ, UDQS, /UDQS, LDQS, /LDQS, UDM, and LDM signal. The ODT pin will be ignored if the Extended Mode Register (EMRS) is programmed to disable ODT. Any time the EMRS enables the ODT function; ODT may not be driven high until eight clocks after the EMRS has been enabled. VDD, VSS, VDDQ, VSSQ (power supply) VDD and VSS are power supply pins for internal circuits. VDDQ and VSSQ are power supply pins for the output buffers. VDDL and VSSDL (power supply) VDDL and VSSDL are power supply pins for DLL circuits. VREF (Power supply) SSTL_18 reference voltage: (0.50 0.01) x VDDQ
Data Sheet E1175E20 (Ver. 2.0)
26
EDE2508AEBG, EDE2516AEBG
Command Operation
Command Truth Table The DDR2 SDRAM recognizes the following commands specified by the /CS, /RAS, /CAS, /WE and address pins.
CKE Function Mode register set Extended mode register set (1) Extended mode register set (2) Auto-refresh Self-refresh entry Self-refresh exit Previou Current Symbol s cycle cycle /CS MRS EMRS EMRS REF SELF H H H H H H H H H L H H H H H H H H H x x L L H H L L L L L H L L L L L L L L L H H L H L /RAS /CAS /WE BA0 L L L L L x H L L L H H H H H x x H x H L L L L L x H H H H L L L L H x x H x H L L L H H x H L L H L L H H H x x H x H L H L x x x x BA x BA BA BA BA BA x x x x x x x x x x x x x BA1 L L H x x x x A12 to A11 A10 MRS OPCODE EMRS (1) OPCODE EMRS (2) OPCODE x x x x x x RA CA CA CA CA x x x x x x L H L H x x x x x x CA CA CA CA x x x x x x 1, 4 x x x x L H x x x x x x 1, 2 1 1, 2 1, 2, 3 1, 2, 3 1, 2, 3 1, 2, 3 1 1 1, 4 A0 to A9 Notes 1 1 1 1 1 1, 6
SELFX L L
Single bank precharge Precharge all banks Bank activate Write Write with auto precharge Read Read with auto precharge No operation Device deselect Power-down mode entry
PRE PALL ACT WRIT
H H H H
WRITA H READ H
READA H NOP DESL PDEN H H H H
Power-down mode exit
PDEX
L L
Remark: H = VIH. L = VIL. x = VIH or VIL. BA = Bank Address, RA = Row Address, CA = Column Address Notes: 1. All DDR2 commands are defined by states of /CS, /RAS, /CAS, /WE and CKE at the rising edge of the clock. 2. Bank select (BA0, BA1), determine which bank is to be operated upon. 3. Burst reads or writes should not be terminated other than specified as Reads interrupted by a Read in burst read command [READ] or Writes interrupted by a Write in burst write command [WRIT]. 4. The power-down mode does not perform any refresh operations. The duration of power-down is therefore limited by the refresh requirements of the device. One clock delay is required for mode entry and exit. 5. The state of ODT does not affect the states described in this table. The ODT function is not available during self-refresh. 6. Self-refresh exit is asynchronous.
Data Sheet E1175E20 (Ver. 2.0)
27
EDE2508AEBG, EDE2516AEBG
CKE Truth Table
CKE Current state* Power-down
2 *3
Previous 1 cycle (n-1)* L L
Current *1 cycle (n) L H L H L L L H
Command(n) /CS, /RAS, /CAS, /WE x DESL or NOP x DESL or NOP DESL or NOP DESL or NOP SELF
Operation (n)
*3
Notes 11, 13, 15 4, 8, 11, 13 11, 15 4, 5, 9 4, 8, 10, 11, 13 4, 8, 10, 11, 13 6, 9, 11, 13 7
Maintain power-down Power-down exit Maintain self-refresh Self-refresh exit Active power-down entry Precharge power-down entry Self-refresh entry
Self-refresh
L L
Bank Active All banks idle
H H H
Any state other than listed above
H
Refer to the Command Truth Table
Remark: H = VIH. L = VIL. x = Don't care Notes: 1. CKE (n) is the logic state of CKE at clock edge n; CKE (n-1) was the state of CKE at the previous clock edge. 2. Current state is the state of the DDR SDRAM immediately prior to clock edge n. 3. Command (n) is the command registered at clock edge n, and operation (n) is a result of Command (n). 4. All states and sequences not shown are illegal or reserved unless explicitly described elsewhere in this document. 5. On self-refresh exit, [DESL] or [NOP] commands must be issued on every clock edge occurring during the tXSNR period. Read commands may be issued only after tXSRD (200 clocks) is satisfied. 6. Self-refresh mode can only be entered from the all banks idle state. 7. Must be a legal command as defined in the command truth table. 8. Valid commands for power-down entry and exit are [NOP] and [DESL] only. 9. Valid commands for self-refresh exit are [NOP] and [DESL] only. 10. Power-down and self-refresh can not be entered while read or write operations, (extended) mode register set operations or precharge operations are in progress. See section Power-Down and Self-Refresh Command for a detailed list of restrictions. 11. Minimum CKE high time is 3 clocks; minimum CKE low time is 3 clocks. 12. The state of ODT does not affect the states described in this table. The ODT function is not available during self-refresh. See section ODT (On Die Termination). 13. The power-down does not perform any refresh operations. The duration of power-down mode is therefore limited by the refresh requirements outlined in section automatic refresh command. 14. CKE must be maintained high while the SDRAM is in OCD calibration mode. 15. "x" means "don't care" (including floating around VREF) in self-refresh and power-down. However ODT must be driven high or low in power-down if the ODT function is enabled (bit A2 or A6 set to "1" in EMRS(1) ).
Data Sheet E1175E20 (Ver. 2.0)
28
EDE2508AEBG, EDE2516AEBG
Function Truth Table The following tables show the operations that are performed when each command is issued in each state of the DDR SDRAM.
Current state Idle /CS H L L L L L L L L L L Bank(s) active H L L L L L L L L L L Read H L L L L L L L L L L /RAS /CAS /WE x H H H L L L L L L L x H H H L L L L L L L x H H H L L L L L L L x H L L H H H L L L L x H L L H H H L L L L x H L L H H H L L L L x H H L H L L H H L L x H H L H L L H H L L x H H L H L L H H L L Address x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
Command DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2) DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2) DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2)
Operation Nop Nop ILLEGAL ILLEGAL Row activating Nop Nop Auto-refresh Self-refresh Mode register accessing
Notes
1 1
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
2 2 2
Extended mode register accessing 2 Nop Nop Begin Read Begin Write ILLEGAL Precharge Precharge all banks ILLEGAL ILLEGAL ILLEGAL ILLEGAL Continue burst to end -> Row active Continue burst to end -> Row active Burst interrupt ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL 1, 4 1 1 1, 8 8 1
x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
Data Sheet E1175E20 (Ver. 2.0)
29
EDE2508AEBG, EDE2516AEBG
Current state Write
/CS H L L L L L L L L L L
/RAS /CAS /WE x H H H L L L L L L L x H H H L L L L L L L x x H L L H H H L L L L x H L L H H H L L L L x x H H L H L L H H L L x H H L H L L H H L L x
Address x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
Command DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS
Operation Continue burst to end -> Write recovering Continue burst to end -> Write recovering ILLEGAL Burst interrupt ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL Continue burst to end -> Precharging Continue burst to end -> Precharging ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL Continue burst to end ->Write recovering with auto precharge Continue burst to end ->Write recovering with auto precharge ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL
Note
1 1, 4 1 1, 8 8
x x
BA, MRS-OPCODE
BA, EMRS-OPCODE EMRS (1) (2)
Read with auto precharge
H L L L L L L L L L L
x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS
1, 7 1, 7 1, 7 1, 7, 8 7, 8
x x
BA, MRS-OPCODE
BA, EMRS-OPCODE EMRS (1) (2)
Write with auto Precharge
H
x
DESL
L L L L L L L L L L
H H H L L L L L L L
H L L H H H L L L L
H H L H L L H H L L
x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS
1, 7 1, 7 1, 7 1, 7, 8 7, 8
x x
BA, MRS-OPCODE
BA, EMRS-OPCODE EMRS (1) (2)
Data Sheet E1175E20 (Ver. 2.0)
30
EDE2508AEBG, EDE2516AEBG
Current state Precharging
/CS H L L L L L L L L L L
/RAS /CAS /WE x H H H L L L L L L L x H H H L L L L L L L x H H H L L L L L L L x H L L H H H L L L L x H L L H H H L L L L x H L L H H H L L L L x H H L H L L H H L L x H H L H L L H H L L x H H L H L L H H L L
Address x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
Command DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2) DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2) DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2)
Operation Nop -> Enter idle after tRP Nop -> Enter idle after tRP ILLEGAL ILLEGAL ILLEGAL Nop -> Enter idle after tRP Nop -> Enter idle after tRP ILLEGAL ILLEGAL ILLEGAL ILLEGAL Nop -> Enter bank active after tRCD Nop -> Enter bank active after tRCD ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL Nop -> Enter bank active after tWR Nop -> Enter bank active after tWR ILLEGAL New write ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL
Note
1 1 1 1, 8 8
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
Row activating
H L L L L L L L L L L
x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
1, 5 1, 5 1
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
Write recovering
H L L L L L L L L L L
x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
1, 6
1 1
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
Data Sheet E1175E20 (Ver. 2.0)
31
EDE2508AEBG, EDE2516AEBG
Current state Write recovering with auto precharge
/CS H L L L L L L L L L L
/RAS /CAS /WE x H H H L L L L L L L x H H H L L L L L L L x H H H L L L L L L L x H L L H H H L L L L x H L L H H H L L L L x H L L H H H L L L L x H H L H L L H H L L x H H L H L L H H L L x H H L H L L H H L L
Address x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
Command DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2) DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2) DESL NOP READ/READA WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2)
Operation Nop -> Precharging after tWR Nop -> Precharging after tWR ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL Nop -> Enter idle after tRFC Nop -> Enter idle after tRFC ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL Nop -> Enter idle after tMRD Nop -> Enter idle after tMRD ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL
Note
1 1 1 1
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
Refresh
H L L L L L L L L L L
x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
Mode register accessing
H L L L L L L L L L L
x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
Data Sheet E1175E20 (Ver. 2.0)
32
EDE2508AEBG, EDE2516AEBG
Current state Extended Mode
/CS H
/RAS /CAS /WE x H H H L L L L L L L x H L L H H H L L L L x H H L H L L H H L L
Address x x
BA, CA, A10 (AP) BA, CA, A10 (AP) BA, RA BA A10 (AP)
Command DESL NOP
Operation Nop -> Enter idle after tMRD Nop -> Enter idle after tMRD
Note
register accessing L L L L L L L L L L
READ/READA ILLEGAL WRIT/WRITA ACT PRE PALL REF SELF MRS EMRS (1) (2) ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL
x x
BA, MRS-OPCODE BA, EMRS-OPCODE
Remark: Notes: 1. 2. 3. 4. 5. 6. 7.
H = VIH. L = VIL. x = VIH or VIL This command may be issued for other banks, depending on the state of the banks. All banks must be in "IDLE". All AC timing specs must be met. Only allowed at the boundary of 4 bits burst. Burst interruptions at other timings are illegal. Available in case tRCD is satisfied by AL setting. Available in case tWTR is satisfied. The DDR2 SDRAM supports the concurrent auto-precharge feature, a read with auto-precharge enabled,or a write with auto-precharge enabled, may be followed by any column command to other banks, as long as that command does not interrupt the read or write data transfer, and all other related limitations apply. (E.g. Conflict between READ data and WRITE data must be avoided.) The minimum delay from a read or write command with auto precharge enabled, to a command to a different bank, is summarized below.
From command Read w/AP
To command (different bank, noninterrupting command) Read or Read w/AP Write or Write w/AP Precharge or Activate
Minimum delay (Concurrent AP supported) BL/2 (BL/2) + 2 1 (CL - 1) + (BL/2) + tWTR BL/2 1
Units tCK tCK tCK tCK tCK tCK
Write w/AP
Read or Read w/AP Write or Write w/AP Precharge or Activate
Data Sheet E1175E20 (Ver. 2.0)
33
EDE2508AEBG, EDE2516AEBG
8. The minimum delay from the read, write and precharge command to the precharge command to the same bank is summarized below. [Precharge and Auto Precharge Clarification]
From command Read To command Precharge (to same bank as read) Precharge all Read w/AP Precharge (to same bank as read w/AP) Precharge all Write Precharge (to same bank as write) Precharge all Write w/AP Precharge (to same bank as write w/AP) Precharge all Precharge Precharge (to same bank as precharge) Precharge all Precharge all Precharge Precharge all Minimum delay between "From command" to "To Command" AL + (BL/2) + Max.(RTP, 2) - 2 AL + (BL/2) + Max.(RTP, 2) - 2 AL + (BL/2) + Max.(RTP, 2) - 2 AL + (BL/2) + Max.(RTP, 2) - 2 WL + (BL/2) + tWR WL + (BL/2) + tWR WL + (BL/2) + WR WL + (BL/2) + WR 1 1 1 1 Units tCK tCK tCK tCK tCK tCK tCK tCK tCK tCK tCK tCK Notes a, b a, b a, b a, b b b b b b b b b
a. RTP[cycles] = RU{ tRTP[ns] / tCK[ns] }, where RU stands for round up. tCK(avg) should be used in place of tCK for DDR2-667/800. b. For a given bank, the precharge period should be counted from the latest precharge command, either one bank precharge or precharge all, issued to that bank. The precharge period is satisfied after tRP depending on the latest precharge command issued to that bank.
Data Sheet E1175E20 (Ver. 2.0)
34
EDE2508AEBG, EDE2516AEBG
Simplified State Diagram
OCD CALIBRATION
INITIALIZATION SEQUENCE SELF REFRESH PRE
SE LF
CK E_ H
CKE_L
MRS EMRS (1) EMRS (2) EMRS (3)
IDLE (E)MRS
ALL BANKS PRECHARGED
REF
AUTO REFRESH
E_ L
CK CK
E_L
ACT
E_H
CK
PRECHARGE POWER DOWN
CKE_L
CKE _L
ACTIVATING
CKE_L
ACTIVE POWER DOWN
CKE CKE _L
_H
BANK ACTIVE WRIT
WR IT
RE
RE
AD
READ
TA
AD
W
RI
WRITE WRIT
READ
A
READ
WRITA
W A RIT
REA DA
READA
PRE, PALL WRITA PRE, PALL PRE, PALL
READA
PRECHARGE
Automatic sequence Command sequence
Simplified State Diagram
Data Sheet E1175E20 (Ver. 2.0)
35
EDE2508AEBG, EDE2516AEBG
Operation of DDR2 SDRAM
Read and write accesses to the DDR2 SDRAM are burst oriented; accesses start at a selected location and continue for the fixed burst length of four or eight in a programmed sequence. Accesses begin with the registration of an active command, which is then followed by a read or write command. The address bits registered coincident with the active command is used to select the bank and row to be accessed (BA0, BA1 select the bank; A0 to A12 select the row). The address bits registered coincident with the read or write command are used to select the starting column location for the burst access and to determine if the auto precharge command is to be issued. Prior to normal operation, the DDR2 SDRAM must be initialized. The following sections provide detailed information covering device initialization; register definition, command descriptions and device operation. Power On and Initialization DDR2 SDRAMs must be powered up and initialized in a predefined manner. Operational procedures other than those specified may result in undefined operation. Power-Up and Initialization Sequence The following sequence is required for power up and initialization. 1 1. Apply power and attempt to maintain CKE below 0.2 x VDDQ and ODT * at a low state (all other inputs may be undefined.) VDD, VDDL and VDDQ are driven from a single power converter output, AND VTT is limited to 0.95V max, AND VREF tracks VDDQ/2. or Apply VDD before or at the same time as VDDL. Apply VDDL before or at the same time as VDDQ. Apply VDDQ before or at the same time as VTT and VREF. at least one of these two sets of conditions must be met. 2. Start clock and maintain stable condition. 3. For the minimum of 200s after stable power and clock (CK, /CK), then apply [NOP] or [DESL] and take CKE high. 4. Wait minimum of 400ns then issue precharge all command. [NOP] or [DESL] applied during 400ns period. 5. Issue EMRS (2) command. (To issue EMRS (2) command, provide low to BA0, high to BA1.) 6. Issue EMRS (3) command. (To issue EMRS (3) command, high to BA0 and BA1.) 7. Issue EMRS to enable DLL. (To issue DLL enable command, provide low to A0, high to BA0 and low to BA1.) 8. Issue a mode register set command for DLL reset. (To issue DLL reset command, provide high to A8 and low to BA0, BA1.) 9. Issue precharge all command. 10. Issue 2 or more auto-refresh commands. 11. Issue a mode register set command with low to A8 to initialize device operation. (i.e. to program operating parameters without resetting the DLL.) 12. At least 200 clocks after step 8, execute OCD calibration (Off Chip Driver impedance adjustment). If OCD calibration is not used, EMRS OCD default command (A9 = A8 = A7 = 1) followed by EMRS OCD calibration mode exit command (A9 = A8 = A7 = 0) must be issued with other operating parameters of EMRS. 13. The DDR2 SDRAM is now ready for normal operation. Note: 1. To guarantee ODT off, VREF must be valid and a low level must be applied to the ODT pin.
tCH tCL CK /CK tIS CKE
Command
NOP 400ns
PALL
tRP
EMRS(2)
EMRS(3)
EMRS
tMRD tMRD
MRS
tMRD
PALL
tRP
REF
tRFC
REF
tRFC
MRS
tMRD
EMRS Follow OCD Flowchart
EMRS
tOIT
Any command
tMRD
DLL enable
DLL reset 200 cycles (min)
OCD default
OCD calibration mode exit
Power up and Initialization Sequence
Data Sheet E1175E20 (Ver. 2.0)
36
EDE2508AEBG, EDE2516AEBG
Programming the Mode Register and Extended Mode Registers For application flexibility, burst length, burst type, /CAS latency, DLL reset function, write recovery time (tWR) are user defined variables and must be programmed with a mode register set command [MRS]. Additionally, DLL disable function, driver impedance, additive /CAS latency, ODT (On Die Termination), single-ended strobe, and OCD (Off-Chip Driver Impedance Adjustment) are also user defined variables and must be programmed with an extended mode register set command [EMRS]. Contents of the Mode Register (MR) or Extended Mode Registers (EMR (#)) can be altered by reexecuting the MRS and EMRS commands. If the user chooses to modify only a subset of the MRS or EMRS variables, all variables must be redefined when the MRS or EMRS commands are issued. MRS, EMRS and Reset DLL do not affect array contents, which means reinitialization including those can be executed any time after power-up without affecting array contents.
DDR2 SDRAM Mode Register Set [MRS] The mode register stores the data for controlling the various operating modes of DDR2 SDRAM. It controls /CAS latency, burst length, burst sequence, test mode, DLL reset, tWR and various vendor specific options to make DDR2 SDRAM useful for various applications. The default value of the mode register is not defined, therefore the mode register must be written after power-up for proper operation. The mode register is written by asserting low on /CS, /RAS, /CAS, /WE, BA0 and BA1, while controlling the state of address pins A0 to A12. The DDR2 SDRAM should be in all bank precharge with CKE already high prior to writing into the mode register. The mode register set command cycle time (tMRD) is required to complete the write operation to the mode register. The mode register contents can be changed using the same command and clock cycle requirements during normal operation as long as all banks are in the precharge state. The mode register is divided into various fields depending on functionality. Burst length is defined by A0 to A2 with options of 4 and 8 bit burst lengths. The burst length decodes are compatible with DDR SDRAM. Burst address sequence type is defined by A3, /CAS latency is defined by A4 to A6. The DDR2 doesn't support half clock latency mode. A7 is used for test mode. A8 is used for DLL reset. A7 must be set to low for normal MRS operation. Write recovery time tWR is defined by A9 to A11. Refer to the table for specific codes.
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address field
0*1
0
PD
WR
DLL TM
/CAS latency
BT
Burst length
Mode register
A8 0 1 BA1 BA0 0 0 1 1 0 1 0 1 MRS mode MRS EMRS(1) EMRS(2)
DLL reset No Yes
A7 0 1
Mode Normal Test
A3 0 1
Burst type Sequential Interleave
Burst length A2 0 0 A1 1 1 A0 0 1 BL 4 8
Write recovery for autoprecharge A11 0 0 0 0 1 1 1 1 A10 0 0 1 1 0 0 1 1 A9 0 1 0 1 0 1 0 1 WR Reserved
DDR2 400 DDR2 533 DDR2 667 DDR2 800
/CAS latency A6 0 0 0 0 1 1 1 1 A5 0 0 1 1 0 0 1 1 A4 0 1 0 1 0 1 0 1 Latency Reserved Reserved Reserved 3 4 5 6 Reserved
EMRS(3): Reserved
2 3 4 5 6 Reserved Reserved
A12 Active power down exit timing 0 Fast exit (use tXARD timing) 1 Slow exit (use tXARDS timing)
Notes: 1. BA1 is reserved for future use and must be programmed to 0 when setting the mode register. 2. WR (min.) (Write Recovery for autoprecharge) is determined by tCK (max.) and WR (max.) is determined by tCK (min.). WR in clock cycles is calculated by dividing tWR (in ns) by tCK (in ns) and rounding up to the next integer (WR [cycles] = tWR (ns) / tCK (ns)). The mode register must be programmed to this value. This is also used with tRP to determine tDAL.
Mode Register Set (MRS)
Data Sheet E1175E20 (Ver. 2.0)
37
EDE2508AEBG, EDE2516AEBG
DDR2 SDRAM Extended Mode Registers Set [EMRS] EMRS (1) Programming The extended mode register (1) stores the data for enabling or disabling the DLL, output driver strength, additive latency, ODT, /DQS disable, OCD program, RDQS enable. The default value of the extended mode register (1) is not defined, therefore the extended mode register (1) must be written after power-up for proper operation. The extended mode register (1) is written by asserting low on /CS, /RAS, /CAS, /WE, high on BA0 and low on BA1, while controlling the states of address pins A0 to A12. The DDR2 SDRAM should be in all banks precharge with CKE already high prior to writing into the extended mode register (1). The mode register set command cycle time (tMRD) must be satisfied to complete the write operation to the extended mode register (1). Mode register contents can be changed using the same command and clock cycle requirements during normal operation as long as all banks are in the precharge state. A0 is used for DLL enable or disable. A1 is used for enabling a half strength output driver. A3 to A5 determines the additive latency, A7 to A9 are used for OCD control, A10 is used for /DQS disable and A11 is used for RDQS enable. A2 and A6 are used for ODT setting.
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address field
0
1
Qoff RDQS /DQS OCD program
Rtt Additive latency Rtt D.I.C DLL
Extended mode register
BA1 BA0 0 0 0 1 1 1 0 1
MRS mode MRS EMRS(1) EMRS(2) EMRS(3): Reserved A6 0 0 1 1 A2 0 1 0 1
Rtt (nominal ) ODT Disabled 75 150 50 A0 0 1 DLL enable Enable Disable
Driver impedance adjustment A9 0 0 0 1 1 A12 0 1 Qoff*3 Output buffers enabled Output buffers disabled A10 0 1 /DQS enable Enable Disable A8 0 0 1 0 1 A7 0 1 0 0 1 Drive(1) Drive(0) Adjust mode* 1 OCD Calibration default* 2 Operation OCD calibration mode exit Additive latency A5 0 0 0 0 1 1 1 1 A4 0 0 1 1 0 0 1 1 A3 0 1 0 1 0 1 0 1 Latency 0 1 2 3 4 5 Reserved Reserved
Driver strength control Output driver Driver size 100% 60% A1 0 1 A11 (RDQS enable) 0 (Disable) 0 (Disable) 1 (Enable) 1 (Enable) A10 0 (Enable) 1 (Disable) 0 (Enable) 1 (Disable) DM DM RDQS RDQS impedance control Normal Weak
A11 0 1
RDQS enable Disable Enable
Strobe function matrix /RDQS High-Z High-Z /RDQS High-Z DQS DQS DQS DQS DQS /DQS /DQS High-Z /DQS High-Z
(/DQS enable) RDQS/DM
Notes: 1. When adjust mode is issued, AL from previously set value must be applied. 2. After setting to default, OCD mode needs to be exited by setting A9 to A7 to 000. Refer to the chapter Off-Chip Driver (OCD)Impedance Adjustment for detailed information 3. Output disabled - DQ, DQS, /DQS, RDQS, /RDQS. This feature is used in conjunction with DIMM IDD measurements when IDDQ is not desired to be included..
EMRS (1)
Data Sheet E1175E20 (Ver. 2.0)
38
EDE2508AEBG, EDE2516AEBG
DLL Enable/Disable The DLL must be enabled for normal operation. DLL enable is required during power up initialization, and upon returning to normal operation after having the DLL disabled. The DLL is automatically disabled when entering selfrefresh operation and is automatically re-enabled upon exit of self-refresh operation. Any time the DLL is enabled (and subsequently reset), 200 clock cycles must occur before a read command can be issued to allow time for the internal clock to be synchronized with the external clock. Failing to wait for synchronization to occur may result in a violation of the tAC or tDQSCK parameters. EMRS (2) Programming The extended mode register (2) controls refresh related features. The default value of the extended mode register (2) is not defined, therefore the extended mode register (2) must be written after power-up for proper operation. The extended mode register (2) is written by asserting low on CS, /RAS, /CAS, /WE, high on BA1 and low on BA0, while controlling the states of address pins A0 to A12. The DDR2 SDRAM should be in all bank precharge with CKE already high prior to writing into the extended mode register (2). The mode register set command cycle time (tMRD) must be satisfied to complete the write operation to the extended mode register (2). Mode register contents can be changed using the same command and clock cycle requirements during normal operation as long as all banks are in the precharge state.
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
*1
Address field Extended mode register (2)
1
0
0*1
SRF
0*1
A7 0 1
High Temperature Self-refresh rate Enable Disable Enable
Note: 1 The rest bits in EMRS (2) is reserved for future use and all bits in EMRS (2) except A7, BA0 and BA1 must be programmed to 0 when setting the extended mode register (2) during initialization.
EMRS(2) EMRS (3) Programming: Reserved*1
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
Address Field Extended Mode Register(3)
1
1
0*1
Note : 1. EMRS (3) is reserved for future use and all bits except BA0 and BA1 must be programmed to 0 when setting the mode register during initialization.
EMRS (3)
Data Sheet E1175E20 (Ver. 2.0)
39
EDE2508AEBG, EDE2516AEBG
Off-Chip Driver (OCD) Impedance Adjustment DDR2 SDRAM supports driver calibration feature and the OCD Flow Chart is an example of sequence. Every calibration mode command should be followed by "OCD calibration mode exit" before any other command being issued. MRS should be set before entering OCD impedance adjustment and ODT (On Die Termination) should be carefully controlled depending on system environment.
MRS should be set before entering OCD impedance adjustment and ODT should be carefully controlled depending on system environment Start EMRS: OCD calibration mode exit
EMRS: Drive(1) DQ & DQS high ; /DQS low
EMRS: Drive(0) DQ & DQS low ; /DQS high
ALL OK Test Need calibration EMRS: OCD calibration mode exit
ALL OK
Test Need calibration
EMRS: OCD calibration mode exit
EMRS : Enter Adjust Mode
EMRS : Enter Adjust Mode
BL=4 code input to all DQs Inc, Dec, or NOP
BL=4 code input to all DQs Inc, Dec, or NOP
EMRS: OCD calibration mode exit
EMRS: OCD calibration mode exit
EMRS: OCD calibration mode exit
End
OCD Flow Chart
Data Sheet E1175E20 (Ver. 2.0)
40
EDE2508AEBG, EDE2516AEBG
Extended Mode Register Set for OCD Impedance Adjustment OCD impedance adjustment can be done using the following EMRS mode. In drive mode all outputs are driven out by DDR2 SDRAM and drive of RDQS is dependent on EMRS bit enabling RDQS operation. In Drive (1) mode, all DQ, DQS (and RDQS) signals are driven high and all /DQS signals are driven low. In drive (0) mode, all DQ, DQS (and RDQS) signals are driven low and all /DQS signals are driven high. In adjust mode, BL = 4 of operation code data must be used. In case of OCD calibration default, output driver characteristics follow approximate nominal V/I curve for 18 output drivers, but are not guaranteed. If tighter control is required, which is controlled within 18 3 driver impedance range, OCD must be used. OCD applies only to normal full strength output drive setting defined by EMRS (1) and if reduced strength is set, OCD default output driver characteristics are not applicable. When OCD calibration adjust mode is used, OCD default output driver characteristics are not applicable. [OCD Mode Set Program]
A9 0 0 0 1 1 A8 0 0 1 0 1 A7 0 1 0 0 1 Operation OCD calibration mode exit Drive (1) DQ, DQS, (RDQS) high and /DQS low Drive (0) DQ, DQS, (RDQS) low and /DQS high Adjust mode OCD calibration default
OCD Impedance Adjustment To adjust output driver impedance, controllers must issue the ADJUST EMRS command along with a 4bit burst code to DDR2 SDRAM as in OCD Adjustment Program table. For this operation, burst length has to be set to BL = 4 via MRS command before activating OCD and controllers must drive this burst code to all DQs at the same time. DT0 in OCD Adjustment Program table means all DQ bits at bit time 0, DT1 at bit time 1, and so forth. The driver output impedance is adjusted for all DDR2 SDRAM DQs simultaneously and after OCD calibration, all DQs and DQS's of a given DDR2 SDRAM will be adjusted to the same driver strength setting. The maximum step count for adjustment is 16 and when the limit is reached, further increment or decrement code has no effect. The default setting may be any step within the 16-step range. When Adjust mode command is issued, AL from previously set value must be applied. [OCD Adjustment Program]
4bits burst data inputs to all DQs DT0 0 0 0 0 1 0 0 1 1 DT1 0 0 0 1 0 1 1 0 0 DT2 0 0 1 0 0 0 1 0 1 DT3 0 1 0 0 0 1 0 1 0 Operation Pull-up driver strength NOP Increase by 1 step Decrease by 1 step NOP NOP Increase by 1 step Decrease by 1 step Increase by 1 step Decrease by 1 step Reserved Pull-down driver strength NOP NOP NOP Increase by 1 step Decrease by 1 step Increase by 1 step Increase by 1 step Decrease by 1 step Decrease by 1 step
Other combinations
Data Sheet E1175E20 (Ver. 2.0)
41
EDE2508AEBG, EDE2516AEBG
For proper operation of adjust mode, WL = RL - 1 = AL + CL - 1 clocks and tDS/tDH should be met as the Output Impedance Control Register Set Cycle. For input data pattern for adjustment, DT0 to DT3 is a fixed order and not affected by MRS addressing mode (i.e. sequential or interleave).
/CK CK Command EMRS WL DQS, /DQS tDS tDH DQ_in DT0 OCD adjust mode DT1 DT2 DT3 OCD calibration mode exit NOP tWR EMRS NOP
Output Impedance Control Register Set Cycle
Drive Mode Drive mode, both drive (1) and drive (0), is used for controllers to measure DDR2 SDRAM Driver impedance before OCD impedance adjustment. In this mode, all outputs are driven out tOIT after "Enter drive mode" command and all output drivers are turned-off tOIT after "OCD calibration mode exit" command as the "Output Impedance Measurement/Verify Cycle".
/CK CK
Command
EMRS High-Z
NOP
EMRS High-Z
DQS, /DQS
DQs high and /DQS low for drive (1), DQs low and /DQS high for drive (0) DQs high for drive (1)
DQ tOIT
DQs low for drive (0) tOIT
Enter drivemode
OCD Calibration mode exit
Output Impedance Measurement/Verify Cycle
Data Sheet E1175E20 (Ver. 2.0)
42
EDE2508AEBG, EDE2516AEBG
ODT (On Die Termination) On Die Termination (ODT), is a feature that allows a DRAM to turn on/off termination resistance for each DQ, DQS, /DQS, RDQS, /RDQS, and DM signal via the ODT control pin. The ODT feature is designed to improve signal integrity of the memory channel by allowing the DRAM controller to independently turn on/off termination resistance for any or all DRAM devices. The ODT function is turned off and not supported in self-refresh mode.
VDDQ VDDQ VDDQ
sw1
sw2
sw3
Rval1 DRAM input buffer Rval1
Rval2
Rval3 Input Pin
Rval2
Rval3
sw1
sw2
sw3
VSSQ
VSSQ
VSSQ
Switch sw1, sw2 or sw3 is enabled by ODT pin. Selection between sw1, sw2 or sw3 is determined by Rtt (nominal) in EMRS Termination included on all DQs, DM, DQS, /DQS, RDQS and /RDQS pins. Target Rtt () = (Rval1) / 2, (Rval2) / 2 or (Rval3) / 2
Functional Representation of ODT
/CK CK Command EMRS NOP
tAOFD ODT tIS tMOD (max.) tMOD (min.) Rtt Old setting Updating New Setting
Note: tAOFD must be met before issuing EMRS command. ODT must remain low for the entire duration of tMOD window.
ODT update Delay Timing
Data Sheet E1175E20 (Ver. 2.0)
43
EDE2508AEBG, EDE2516AEBG
/CK CK
T0
T1
T2
T3
T4
T5
T6
CKE
tAXPD 6tCK tIS tIS
ODT
tAOND tAOFD
Internal Term Res.
tAON min.
Rtt tAOF min. tAON max. tAOF max.
ODT Timing for Active and Standby Mode
/CK CK
T0
T1
T2
T3
T4
T5
T6
CKE
tAXPD 6tCK tIS tIS
ODT
tAOFPD max. tAOFPD min.
Internal Term Res.
tAONPD min. tAONPD max.
Rtt
ODT Timing for Power-Down Mode
Data Sheet E1175E20 (Ver. 2.0)
44
EDE2508AEBG, EDE2516AEBG
T-5 /CK CK tANPD tIS CKE T-4 T-3 T-2 T-1 T0 T1 T2 T3 T4
Entering slow exit active power down mode or precharge power down mode.
tIS ODT tAOFD Internal Term Res. Rtt tIS ODT tAOFPD(max.) Internal Term Res. tIS ODT tAOND Internal Term Res. tIS ODT tAONPD(max.) Internal Term Res. Rtt Rtt Rtt
Active and standby mode timings to be applied.
Power down mode timings to be applied.
Active and standby mode timings to be applied.
Power down mode timings to be applied.
ODT Timing Mode Switch at Entering Power-Down Mode
Data Sheet E1175E20 (Ver. 2.0)
45
EDE2508AEBG, EDE2516AEBG
T0 /CK CK tIS CKE tAXPD T1 T4 T5 T6 T7 T8 T9 T10 T11
Exiting from slow active power down mode or precharge power down mode.
tIS
Active and standby mode timings to be applied.
ODT tAOFD Internal Term Res. tIS Rtt
Power down mode timings to be applied.
ODT tAOFPD (max.) Internal Term Res. Rtt tIS
Active and standby mode timings to be applied.
ODT tAOND Internal Term Res. tIS Rtt
Power down mode timings to be applied.
ODT tAONPD(max.) Internal Term Res. Rtt
ODT Timing Mode Switch at Exiting Power-Down Mode
Data Sheet E1175E20 (Ver. 2.0)
46
EDE2508AEBG, EDE2516AEBG
Bank Activate Command [ACT] The bank activate command is issued by holding /CAS and /WE high with /CS and /RAS low at the rising edge of the clock. The bank addresses BA0 and BA1, are used to select the desired bank. The row address A0 through A12 is used to determine which row to activate in the selected bank. The Bank activate command must be applied before any read or write operation can be executed. Immediately after the bank active command, the DDR2 SDRAM can accept a read or write command on the following clock cycle. If a R/W command is issued to a bank that has not satisfied the tRCD (min.) specification, then additive latency must be programmed into the device to delay when the R/W command is internally issued to the device. The additive latency value must be chosen to assure tRCD (min.) is satisfied. Additive latencies of 0, 1, 2, 3 and 4 are supported. Once a bank has been activated it must be precharged before another bank activate command can be applied to the same bank. The bank active and precharge times are defined as tRAS and tRP, respectively. The minimum time interval between successive bank activate commands to the same bank is determined by the /RAS cycle time of the device (tRC), which is equal to tRAS + tRP. The minimum time interval between successive bank activate commands to the different bank is determined by (tRRD).
/CK CK Command
T0
T1
T2
T3
Tn
Tn+1
Tn+2
Tn+3
ACT
Posted READ
ACT
Posted READ
PRE
PRE
ACT
tRCD(min.)
Address
ROW: 0
COL: 0
ROW: 1
tCCD
COL: 1
ROW: 0
Additive latency (AL) tRRD tRAS
Bank0 Read begins
tRP tRC
Bank0 Active
Bank1 Active
Bank0 Precharge
Bank1 Precharge
Bank0 Active
Bank Activate Command Cycle (tRCD = 3, AL = 2, tRP = 3, tRRD = 2, tCCD = 2)
Data Sheet E1175E20 (Ver. 2.0)
47
EDE2508AEBG, EDE2516AEBG
Read and Write Access Modes After a bank has been activated, a read or write cycle can be executed. This is accomplished by setting /RAS high, /CS and /CAS low at the clock's rising edge. /WE must also be defined at this time to determine whether the access cycle is a read operation (/WE high) or a write operation (/WE low). The DDR2 SDRAM provides a fast column access operation. A single read or write command will initiate a serial read or write operation on successive clock cycles. The boundary of the burst cycle is strictly restricted to specific segments of the page length. For example, the 32M bits x 4 I/O x 4 banks chip has a page length of 2048 bits (defined by CA0 to CA9, CA11). The page length of 2048 is divided into 512 uniquely addressable boundary segments (4 bits each). A 4 bits burst operation will occur entirely within one of the 512 groups beginning with the column address supplied to the device during the read or write command (CA0 to CA9, CA11). The second, third and fourth access will also occur within this group segment, however, the burst order is a function of the starting address, and the burst sequence. A new burst access must not interrupt the previous 4-bit burst operation. The minimum /CAS to /CAS delay is defined by tCCD, and is a minimum of 2 clocks for read or write cycles. Posted /CAS Posted /CAS operation is supported to make command and data bus efficient for sustainable bandwidths in DDR2 SDRAM. In this operation, the DDR2 SDRAM allows a /CAS read or write command to be issued immediately after the /RAS bank activate command (or any time during the /RAS-/CAS-delay time, tRCD, period). The command is held for the time of the Additive Latency (AL) before it is issued inside the device. The Read Latency (RL) is controlled by the sum of AL and the /CAS latency (CL). Therefore if a user chooses to issue a R/W command before the tRCD (min), then AL (greater than 0) must be written into the EMRS. The Write Latency (WL) is always defined as RL - 1 (read latency -1) where read latency is defined as the sum of additive latency plus /CAS latency (RL = AL + CL).
-1 /CK CK Command ACT READ AL = 2 DQS, /DQS tRCD RL = AL + CL = 5 DQ tRAC
out0 out1 out2 out3 in0 in1 in2 in3
0
1
2
3
4
5
6
7
8
9
10
11
12
NOP
WRIT CL = 3 WL = RL - 1 = 4
NOP
Read Followed by a Write to the Same Bank [AL = 2 and CL = 3, RL = (AL + CL) = 5, WL = (RL - 1) = 4]
-1 /CK CK Command
0
1
2
3
4
5
6
7
8
9
10
11
12
ACT
NOP
AL = 0 READ
NOP CL = 3
WRIT WL = RL - 1 = 2
NOP
DQS, /DQS tRCD RL = AL + CL = 3 DQ tRAC
out0 out1 out2 out3 in0 in1 in2 in3
Read Followed by a Write to the Same Bank [AL = 0 and CL = 3, RL = (AL + CL) = 3, WL = (RL - 1) = 2]
Data Sheet E1175E20 (Ver. 2.0)
48
EDE2508AEBG, EDE2516AEBG
Burst Mode Operation Burst mode operation is used to provide a constant flow of data to memory locations (write cycle), or from memory locations (read cycle). The parameters that define how the burst mode will operate are burst sequence and burst length. DDR2 SDRAM supports 4 bits burst and 8bits burst modes only. For 8 bits burst mode, full interleave address ordering is supported, however, sequential address ordering is nibble based for ease of implementation. The burst type, either sequential or interleaved, is programmable and defined by the address bit 3 (A3) of the MRS, which is similar to the DDR-I SDRAM operation. Seamless burst read or write operations are supported. Unlike DDR-I devices, interruption of a burst read or writes operation is limited to ready by Read or Write by Write at the boundary of Burst 4. Therefore the burst stop command is not supported on DDR2 SDRAM devices. [Burst Length and Sequence, BL = 4]
Burst length Starting address (A1, A0) 00 4 01 10 11 Sequential addressing (decimal) 0, 1, 2, 3 1, 2, 3, 0 2, 3, 0, 1 3, 0, 1, 2 Interleave addressing (decimal) 0, 1, 2, 3 1, 0, 3, 2 2, 3, 0, 1 3, 2, 1, 0
[Burst Length and Sequence, BL = 8]
Burst length Starting address (A2, A1, A0) Sequential addressing (decimal) 000 001 010 8 011 100 101 110 111 0, 1, 2, 3, 4, 5, 6, 7 1, 2, 3, 0, 5, 6, 7, 4 2, 3, 0, 1, 6, 7, 4, 5 3, 0, 1, 2, 7, 4, 5, 6 4, 5, 6, 7, 0, 1, 2, 3 5, 6, 7, 4, 1, 2, 3, 0 6, 7, 4, 5, 2, 3, 0, 1 7, 4, 5, 6, 3, 0, 1, 2 Interleave addressing (decimal) 0, 1, 2, 3, 4, 5, 6, 7 1, 0, 3, 2, 5, 4, 7, 6 2, 3, 0, 1, 6, 7, 4, 5 3, 2, 1, 0, 7, 6, 5, 4 4, 5, 6, 7, 0, 1, 2, 3 5, 4, 7, 6, 1, 0, 3, 2 6, 7, 4, 5, 2, 3, 0, 1 7, 6, 5, 4, 3, 2, 1, 0
Note: Page length is a function of I/O organization and column addressing 8M bits x 8 organization (CA0 to CA9); Page Length = 1024 bits 4M bits x 16 organization (CA0 to CA8); Page Length = 512 bits
Data Sheet E1175E20 (Ver. 2.0)
49
EDE2508AEBG, EDE2516AEBG
Burst Read Command [READ] The Burst Read command is initiated by having /CS and /CAS low while holding /RAS and /WE high at the rising edge of the clock. The address inputs determine the starting column address for the burst. The delay from the start of the command to when the data from the first cell appears on the outputs is equal to the value of the read latency (RL). The data strobe output (DQS) is driven low 1 clock cycle before valid data (DQ) is driven onto the data bus. The first bit of the burst is synchronized with the rising edge of the data strobe (DQS). Each subsequent data-out appears on the DQ pin in phase with the DQS signal in a source synchronous manner. The RL is equal to an additive latency (AL) plus /CAS latency (CL). The CL is defined by the mode register set (MRS), similar to the existing SDR and DDR-I SDRAMs. The AL is defined by the extended mode register set (EMRS).
T0 /CK CK Command
READ tDQSCK NOP
T1
T2
T3
T4
T5
T6
T7
T8
DQS, /DQS
CL = 3 RL = 3
DQ
out0 out1 out2 out3
Burst Read Operation (RL = 3, BL = 4 (AL = 0 and CL = 3))
T0 /CK CK Command
READ
T1
T2
T3
T4
T5
T6
T7
T8
NOP tDQSCK
DQS, /DQS
CL = 3 RL = 3
DQ
out0 out1 out2 out3 out4 out5 out6 out7
Burst Read Operation (RL = 3, BL = 8 (AL = 0 and CL = 3))
Data Sheet E1175E20 (Ver. 2.0)
50
EDE2508AEBG, EDE2516AEBG
T0 /CK CK Command
Posted READ NOP
T1
T2
T3
T4
T5
T6
T7
T8
tDQSCK
DQS, /DQS
AL = 2 RL = 5 CL = 3
DQ
out0 out1 out2 out3
Burst Read Operation (RL = 5, BL = 4 (AL = 2, CL = 3))
T0 /CK CK Command
Posted READ
T1
T3
T4
T5
T6
T7
T8
T9
NOP
NOP
Posted WRIT
NOP
tRTW (Read to Write = 4 clocks)
DQS, /DQS
RL = 5 WL = RL - 1 = 4
DQ
out0 out1 out2 out3
in0
in1
in2
in3
Burst Read Followed by Burst Write (RL = 5, WL = RL-1 = 4, BL = 4) The minimum time from the burst read command to the burst write command is defined by a read-to-write-turnaround-time, which is 4 clocks in the case of BL = 4 operation, 6 clocks in case of BL =8 operation.
T0 /CK CK Command
Posted READ A
T1
T2
T3
T4
T5
T6
T7
T8
NOP
Posted READ B
NOP
DQS, /DQS
AL = 2 CL = 3 RL = 5 out A0 out A1 out A2 out A3 out B0 out B1 out B2
DQ
Seamless Burst Read Operation (RL = 5, AL = 2, and CL = 3)
Data Sheet E1175E20 (Ver. 2.0)
51
EDE2508AEBG, EDE2516AEBG
Enabling a read command at every other clock supports the seamless burst read operation. This operation is allowed regardless of same or different banks as long as the banks are activated.
T0 CK /CK Command
READ NOP READ
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
NOP
A
B
DQS, /DQS
RL = 4
DQ
out A0
out A1
out A2
out A3
out B0
out out B1 B2
out B3
out B4
out B5
out B6
out B7
Burst interrupt is only allowed at this timing.
Burst Read Interrupt by Read Notes: 1. Read burst interrupt function is only allowed on burst of 8. burst interrupt of 4 is prohibited. 2. Read burst of 8 can only be interrupted by another read command. Read burst interruption by write command or precharge command is prohibited. 3. Read burst interrupt must occur exactly two clocks after previous read command. any other read burst interrupt timings are prohibited. 4. Read burst interruption is allowed to any bank inside DRAM. 5. Read burst with auto precharge enabled is not allowed to interrupt. 6. Read burst interruption is allowed by another read with auto precharge command. 7. All command timings are referenced to burst length set in the mode register. They are not referenced to actual burst. For example, minimum read to precharge timing is AL + BL/2 where BL is the burst length set in the mode register and not the actual burst (which is shorter because of interrupt).
Data Sheet E1175E20 (Ver. 2.0)
52
EDE2508AEBG, EDE2516AEBG
Burst Write Command [WRIT] The Burst Write command is initiated by having /CS, /CAS and /WE low while holding /RAS high at the rising edge of the clock. The address inputs determine the starting column address. Write latency (WL) is defined by a read latency (RL) minus one and is equal to (AL + CL -1). A data strobe signal (DQS) should be driven low (preamble) one clock prior to the WL. The first data bit of the burst cycle must be applied to the DQ pins at the first rising edge of the DQS following the preamble. The tDQSS specification must be satisfied for write cycles. The subsequent burst bit data are issued on successive edges of the DQS until the burst length of 4 is completed. When the burst has finished, any additional data supplied to the DQ pins will be ignored. The DQ Signal is ignored after the burst write operation is complete. The time from the completion of the burst write to bank precharge is the write recovery time (tWR).
T0 /CK CK Command
WRIT tDQSS NOP PRE NOP
T1
T2
T3
T4
T5
T6
T7
T9
ACT
DQS, /DQS
WL = RL -1 = 2 tWR tRP
DQ
in0
in1
in2
in3
Completion of the burst write
Burst Write Operation (RL = 3, WL = 2, BL = 4 tWR = 2 (AL=0, CL=3))
T0 /CK CK Command
WRIT
T1
T2
T3
T4
T5
T6
T7
T8
T9
T11
NOP
PRE
NOP
ACT
tDQSS
DQS, /DQS
WL = RL -1 = 2 tWR tRP
DQ
in0
in1
in2
in3
in4
in5
in6
in7
Completion of the burst write
Burst Write Operation (RL = 3, WL = 2, BL = 8 (AL=0, CL=3))
Data Sheet E1175E20 (Ver. 2.0)
53
EDE2508AEBG, EDE2516AEBG
T0 /CK CK Command
Posted WRIT NOP tDQSS PRE
T1
T2
T3
T4
T5
T6
T7
T9
DQS, /DQS
WL = RL -1 = 4 tWR
DQ
in0
in1
in2
in3
Completion of the burst write
Burst Write Operation (RL = 5, WL = 4, BL = 4 tWR = 3 (AL=2, CL=3))
T0 /CK CK Command
Write to Read = CL - 1 + BL/2 + tWTR (2) = 6 NOP Posted READ NOP
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
DQS, /DQS
AL = 2 WL = RL -1 = 4 >tWTR = RL = 5 CL = 3
DQ
in0
in1
in2
in3
out0
out1
Burst Write Followed by Burst Read (RL = 5, BL = 4, WL = 4, tWTR = 2 (AL=2, CL=3)) The minimum number of clock from the burst write command to the burst read command is CL - 1 + BL/2 + a write to-read-turn-around-time (tWTR). This tWTR is not a write recovery time (tWR) but the time required to transfer the 4bit write data from the input buffer into sense amplifiers in the array.
T0 /CK CK Command
Posted WRIT A NOP Posted WRIT B NOP
T1
T2
T3
T4
T5
T6
T7
T8
DQS, /DQS
WL = RL - 1 = 4
DQ
in A0
in A1
in A2
in A3
in B0
in B1
in B2
in B3
Seamless Burst Write Operation (RL = 5, WL = 4, BL = 4) Enabling a write command every other clock supports the seamless burst write operation. This operation is allowed regardless of same or different banks as long as the banks are activated.
Data Sheet E1175E20 (Ver. 2.0)
54
EDE2508AEBG, EDE2516AEBG
T0 CK /CK Command
WRIT NOP WRIT
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
NOP
A
B
DQS, /DQS
WL = 3
in in in in A0 A1 A2 A3 in B0 in in in in in in B1 B2 B3 B4 B5 B6 in B7
DQ
Burst interrupt is only allowed at this timing.
Write Interrupt by Write (WL = 3, BL = 8) Notes :1. Write burst interrupt function is only allowed on burst of 8. Burst interrupt of 4 is prohibited. 2. Write burst of 8 can only be interrupted by another write command. Write burst interruption by read command or precharge command is prohibited. 3. Write burst interrupt must occur exactly two clocks after previous write command. Any other write burst interrupt timings are prohibited. 4. Write burst interruption is allowed to any bank inside DRAM. 5. Write burst with auto precharge enabled is not allowed to interrupt. 6. Write burst interruption is allowed by another write with auto precharge command. 7. All command timings are referenced to burst length set in the mode register. They are not referenced to actual burst. For example, minimum write to precharge timing is WL+BL/2+tWR where tWR starts with the rising clock after the un-interrupted burst end and not from the end of actual burst end.
Data Sheet E1175E20 (Ver. 2.0)
55
EDE2508AEBG, EDE2516AEBG
Write Data Mask One write data mask (DM) pin for each 8 data bits (DQ) will be supported on DDR2 SDRAMs, Consistent with the implementation on DDR-I SDRAMs. It has identical timings on write operations as the data bits, and though used in a uni-directional manner, is internally loaded identically to data bits to insure matched system timing. DM is not used during read cycles.
T1 DQS /DQS DQ T2 T3 T4 T5 Tn
in
in
in
in
in
in
in
in
in
DM Write mask latency = 0
Data Mask Timing
[tDQSS(min.)] /CK CK
tWR
Command
WRIT
WL tDQSS
NOP
DQS, /DQS DQ DM
WL
in0
in2 in3
[tDQSS(max.)] DQS, /DQS DQ DM
tDQSS
in0
in2 in3
Data Mask Function, WL = 3, AL = 0 shown
Data Sheet E1175E20 (Ver. 2.0)
56
EDE2508AEBG, EDE2516AEBG
Precharge Command [PRE] The precharge command is used to precharge or close a bank that has been activated. The precharge command is triggered when /CS, /RAS and /WE are low and /CAS is high at the rising edge of the clock. The precharge command can be used to precharge each bank independently or all banks simultaneously. Three address bits A10, BA0 and BA1 are used to define which bank to precharge when the command is issued. [Bank Selection for Precharge by Address Bits]
A10 L L L L H BA0 L H L H x BA1 L L H H x Precharged Bank(s) Bank 0 only Bank 1 only Bank 2 only Bank 3 only All banks 0 to 3
Remark: H: VIH, L: VIL, x: VIH or VIL Burst Read Operation Followed by Precharge Minimum read to precharge command spacing to the same bank = AL + BL/2 clocks For the earliest possible precharge, the precharge command may be issued on the rising edge that is "Additive latency (AL) + BL/2 clocks" after a Read command. A new bank active (command) may be issued to the same bank after the RAS precharge time (tRP). A precharge command cannot be issued until tRAS is satisfied.
T0 /CK CK Command
Posted READ NOP AL + BL/2 clocks PRE NOP ACT NOP
T1
T2
T3
T4
T5
T6
T7
T8
DQS, /DQS
AL = 1 RL = 4 CL = 3 tRP
DQ
tRAS
out0
out1
out2
out3
Burst Read Operation Followed by Precharge (RL = 4, BL = 4 (AL=1, CL=3))
T0 /CK CK Command
Posted READ
T1
T2
T3
T4
T5
T6
T7
T8
NOP AL + /BL2 clocks
PRE
NOP
ACT
NOP
DQS, /DQS
AL = 2 RL = 5 CL = 3 tRP
DQ
tRAS(min.)
out0
out1
out2
out3
Burst Read Operation Followed by Precharge (RL = 5, BL = 4 (AL=2, CL=3))
Data Sheet E1175E20 (Ver. 2.0)
57
EDE2508AEBG, EDE2516AEBG
T0 /CK CK Command
Posted READ NOP AL + BL/2 Clocks PRE NOP ACT NOP
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
DQS, /DQS
AL = 2 RL = 6 CL = 4 tRP
DQ
tRAS(min.)
out0
out1
out2
out3
out4
out5
out6
out7
Burst Read Operation Followed by Precharge (RL = 6 (AL=2, CL=4, BL=8))
Data Sheet E1175E20 (Ver. 2.0)
58
EDE2508AEBG, EDE2516AEBG
Burst Write followed by Precharge Minimum Write to Precharge Command spacing to the same bank = WL + BL/2 clocks + tWR For write cycles, a delay must be satisfied from the completion of the last burst write cycle until the precharge command can be issued. This delay is known as a write recovery time (tWR) referenced from the completion of the burst write to the precharge command. No precharge command should be issued prior to the tWR delay, as DDR2 SDRAM allows the burst interrupt operation only Read by Read or Write by Write at the boundary of burst 4.
T0 /CK CK Command
Posted WRIT
T1
T2
T3
T4
T5
T6
T7
T8
NOP
PRE
tWR
DQS, /DQS
WL = 3
DQ
in0
in1
in2
in3
Completion of the burst write
Burst Write Followed by Precharge (WL = (RL-1) =3)
T0 /CK CK Command
Posted WRIT
T1
T2
T3
T4
T5
T6
T7
T9
NOP
PRE
tWR
DQS, /DQS
WL = 4
DQ
in0
in1
in2
in3
Completion of the burst write
Burst Write Followed by Precharge (WL = (RL-1) = 4)
Data Sheet E1175E20 (Ver. 2.0)
59
EDE2508AEBG, EDE2516AEBG
T0 /CK CK Command
Posted WRIT NOP PRE
T1
T2
T3
T4
T5
T6
T7
T8
T9
T11
tWR
DQS, /DQS
WL = 4
DQ
in0
in1
in2
in3
in4
in5
in6
in7
Completion of the burst write
Burst Write Followed by Precharge (WL = (RL-1) = 4,BL= 8)
Data Sheet E1175E20 (Ver. 2.0)
60
EDE2508AEBG, EDE2516AEBG
Auto Precharge Operation Before a new row in an active bank can be opened, the active bank must be precharged using either the precharge command or the auto precharge function. When a read or a write command is given to the DDR2 SDRAM, the /CAS timing accepts one extra address, column address A10, to allow the active bank to automatically begin precharge at the earliest possible moment during the burst read or write cycle. If A10 is low when the read or write Command is issued, then normal read or write burst operation is executed and the bank remains active at the completion of the burst sequence. If A10 is high when the Read or Write Command is issued, then the auto precharge function is engaged. During auto precharge, a read Command will execute as normal with the exception that the active bank will begin to precharge on the rising edge which is /CAS latency (CL) clock cycles before the end of the read burst. Auto precharge can also be implemented during Write commands. The precharge operation engaged by the Auto precharge command will not begin until the last data of the burst write sequence is properly stored in the memory array. This feature allows the precharge operation to be partially or completely hidden during burst read cycles (dependent upon /CAS latency) thus improving system performance for random data access. The /RAS lockout circuit internally delays the Precharge operation until the array restore operation has been completed so that the auto precharge command may be issued with any read or write command. Burst Read with Auto Precharge [READA] If A10 is high when a Read Command is issued, the Read with Auto Precharge function is engaged. The DDR2 SDRAM starts an auto Precharge operation on the rising edge which is (AL + BL/2) cycles later from the read with AP command when tRAS (min) is satisfied. If tRAS (min.) is not satisfied at the edge, the start point of auto precharge operation will be delayed until tRAS (min.) is satisfied. A new bank active (command) may be issued to the same bank if the following two conditions are satisfied simultaneously. (1) The /RAS precharge time (tRP) has been satisfied from the clock at which the auto precharge begins. (2) The /RAS cycle time (tRC) from the previous bank activation has been satisfied.
T0 /CK CK Command
A10 = 1
Posted READ NOP ACT NOP ACT
T1
T2
T3
T4
T5
T6
T7
Tn
AL + BL/2
DQS, /DQS
tRP AL = 2 RL = 5 CL = 3 out0 out1 out2 out3 tRC (min.)
DQ
Auto precharge begins
Burst Read with Auto Precharge Followed by an Activation to the Same Bank (tRC limit) (RL = 5, BL = 4 (AL = 2, CL = 3, tRTP 2tCK))
Data Sheet E1175E20 (Ver. 2.0)
61
EDE2508AEBG, EDE2516AEBG
T-1 /CK CK Command
A10 = 1
Posted READ
T0
T1
T2
T3
T4
T5
T6
T7
Tn
NOP tRAS(min.)
ACT
DQS, /DQS
tRP AL = 2 RL = 5 CL = 3
out0 out1 out2 out3
DQ
tRC (min.)
Auto precharge begins
Burst Read with Auto Precharge Followed by an Activation to the Same Bank (tRAS lockout case) (RL = 5, BL = 4 (AL = 2, CL = 3))
T0 /CK CK Command
A10 = 1
Posted READ
T1
T2
T3
T4
T5
T6
T7
T8
NOP tRAS(min.)
ACT
NOP
DQS, /DQS
tRP (min.) AL = 2 RL = 5 CL = 3
out0 out1 out2 out3
DQ
tRC
Auto precharge begins
Burst Read with Auto Precharge Followed by an Activation to the Same Bank (tRP limit) (RL = 5, BL = 4 (AL = 2, CL = 3, tRTP 2tCK))
T0 CK /CK
A10 = 1
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
Command
READ tRAS (min.)
NOP
ACT
DQS, /DQS
AL = 2 RL = 5 CL = 3 tRP
out0 out1 out2 out3 out4 out5 out6 out7
DQ
tRC
Auto precharge begins
Burst Read with Auto Precharge Followed by an Activation to the Same Bank (RL = 5, BL = 8 (AL = 2, CL = 3, tRTP 2tCK))
Data Sheet E1175E20 (Ver. 2.0)
62
EDE2508AEBG, EDE2516AEBG
Burst Write with Auto Precharge [WRITA] If A10 is high when a write command is issued, the Write with auto precharge function is engaged. The DDR2 SDRAM automatically begins precharge operation after the completion of the burst writes plus write recovery time (tWR). The bank undergoing auto precharge from the completion of the write burst may be reactivated if the following two conditions are satisfied. (1) The data-in to bank activate delay time (tWR + tRP) has been satisfied. (2) The /RAS cycle time (tRC) from the previous bank activation has been satisfied.
T0 /CK CK Command
A10 = 1
Posted WRIT
T1
T2
T3
T4
T5
T6
T7
Tm
NOP
ACT
DQS, /DQS
WL = RL -1 = 2 tWR
in1 in2 in3
tRP
DQ
in0
tRC (min.)
Completion of the burst write
Auto precharge begins
Burst Write with Auto Precharge (tRC Limit) (WL = 2, tWR =2)
T0 /CK CK Command
A10 = 1
Posted WRIT
T3
T4
T5
T6
T7
T8
T9
T10
T11
NOP
NOP
ACT
DQS, /DQS
WL = RL -1 = 4 tWR (min.)
in1 in2 in3
tRP (min.)
DQ
in0
tRC Auto precharge begins
Completion of the burst write
Burst Write with Auto Precharge (tWR + tRP) (WL = 4, tWR =2, tRP=3)
Data Sheet E1175E20 (Ver. 2.0)
63
EDE2508AEBG, EDE2516AEBG
T0 CK /CK
A10 = 1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
Command
WRIT
NOP
ACT
DQS, /DQS
WL = RL - 1 = 4 tWR
in0 in1 in2 in3 in4 in5 in6 in7
tRP
DQ
tRC
Auto precharge begins
Burst Write with Auto Precharge Followed by an Activation to the Same Bank (WL = 4, BL = 8, tWR = 2, tRP = 3)
Data Sheet E1175E20 (Ver. 2.0)
64
EDE2508AEBG, EDE2516AEBG
Refresh Requirements DDR2 SDRAM requires a refresh of all rows in any rolling 64ms interval. Each refresh is generated in one of two ways: by an explicit automatic refresh command, or by an internally timed event in self-refresh mode. Dividing the number of device rows into the rolling 64 ms interval defines the average refresh interval, tREFI, which is a guideline to controllers for distributed refresh timing. Automatic Refresh Command [REF] When /CS, /RAS and /CAS are held low and /WE high at the rising edge of the clock, the chip enters the automatic refresh mode (REF). All banks of the DDR2 SDRAM must be precharged and idle for a minimum of the precharge time (tRP) before the auto-refresh command (REF) can be applied. An address counter, internal to the device, supplies the bank address during the refresh cycle. No control of the external address bus is required once this cycle has started. When the refresh cycle has completed, all banks of the DDR2 SDRAM will be in the precharged (idle) state. A delay between the auto-refresh command (REF) and the next activate command or subsequent auto-refresh command must be greater than or equal to the auto-refresh cycle time (tRFC). To allow for improved efficiency in scheduling and switching between tasks, some flexibility in the absolute refresh interval is provided. A maximum of 8 refresh commands can be posted to any given DDR2 SDRAM, meaning that the maximum absolute interval between any refresh command and the next Refresh command is 9 x tREFI.
T0 /CK CK
VIH
T1
T2
T3
CKE
tRP
tRFC
tRFC
Command
PRE
NOP
REF
REF
NOP
Any Command
Automatic Refresh Command
Data Sheet E1175E20 (Ver. 2.0)
65
EDE2508AEBG, EDE2516AEBG
Self-Refresh Command [SELF] The DDR2 SDRAM device has a built-in timer to accommodate self-refresh operation. The self-refresh command is defined by having /CS, /RAS, /CAS and CKE held low with /WE high at the rising edge of the clock. ODT must be turned off before issuing self-refresh command, by either driving ODT pin low or using EMRS command. Once the command is registered, CKE must be held low to keep the device in self-refresh mode. When the DDR2 SDRAM has entered self-refresh mode all of the external signals except CKE, are "don't care". The clock is internally disabled during self-refresh operation to save power. The user may change the external clock frequency or halt the external clock one clock after Self-Refresh entry is registered, however, the clock must be restarted and stable before the device can exit self-refresh operation. Once self-refresh exit command is registered, a delay equal or longer than the tXSNR or tXSRD must be satisfied before a valid command can be issued to the device. CKE must remain high for the entire self-refresh exit period tXSRD for proper operation. NOP or deselect commands must be registered on each positive clock edge during the self-refresh exit interval. ODT should also be turned off during tXSRD.
T0 T1 T2 T3 T4 T5 T6 Tm Tn
tCK
tCH tCL /CK CK tXSNR tRP* tXSRD CKE tIS tAOFD ODT tIS tIS
tIS tIH
Comand
SELF NOP NOP NOP Valid
Notes: 1. Device must be in the "All banks idle" state prior to entering self refresh mode. 2. ODT must be turned off tAOFD before entering self refresh mode, and can be turned on again when tXSRD timing is satisfied. 3. tXSRD is applied for a read or a read with autoprecharge command. 4. tXSNR is applied for any command except a read or a read with autoprecharge command.
Self-Refresh Command
Data Sheet E1175E20 (Ver. 2.0)
66
EDE2508AEBG, EDE2516AEBG
Power-Down [PDEN] Power-down is synchronously entered when CKE is registered low (along with NOP or deselect command). CKE is not allowed to go low while mode register or extended mode register command time, or read or write operation is in progress. CKE is allowed to go low while any of other operations such as row activation, precharge or auto precharge, or auto-refresh is in progress, but power-down IDD spec will not be applied until finishing those operations. Timing diagrams are shown in the following pages with details for entry into power-down. The DLL should be in a locked state when power-down is entered. Otherwise DLL should be reset after exiting power-down mode for proper read operation. If power-down occurs when all banks are idle, this mode is referred to as precharge power-down; if power-down occurs when there is a row active in any bank, this mode is referred to as active power-down. Entering power-down deactivates the input and output buffers, excluding CK, /CK, ODT and CKE. Also the DLL is disabled upon entering precharge power-down or slow exit active power-down, but the DLL is kept enabled during fast exit active powerdown. In power-down mode, CKE low and a stable clock signal must be maintained at the inputs of the DDR2 SDRAM, and ODT should be in a valid state but all other input signals are "Don't Care". CKE low must be maintained until tCKE has been satisfied. Power-down duration is limited by 9 times tREFI of the device. The power-down state is synchronously exited when CKE is registered high (along with a NOP or deselect command). CKE high must be maintained until tCKE has been satisfied. A valid, executable command can be applied with power-down exit latency, tXP, tXARD, or tXARDS, after CKE goes high. Power-down exit latency is defined at AC Characteristics table of this data sheet.
CK /CK CKE tIS tIH tIS tIH tIH tIS tIH tIS tIH
Command
VALID
NOP tCKE min
NOP
VALID
VALID
VALID
tXP, tXARD, tXARDS tCKE min Exit power-down mode VIH or VIL
Enter power-down mode
Power-Down Read to Power-Down Entry
T0 /CK CK Command
VIH READ
T1
T2
Tx
Tx+1
Tx+2
Tx+3
Tx+4
Tx+5
Tx+6
Tx+7
Tx+8
Tx+9
Read operation starts with a read command and CKE should be kept high until the end of burst operation.
CKE
DQS /DQS
AL + CL
DQ
out 0
out 1
out 2
out 3
BL=4
T0
T1
T2
Tx
Tx+1
Tx+2
Tx+3
Tx+4
Tx+5
Tx+6
Tx+7
Tx+8
Tx+9
Command
VIH
READ
CKE should be kept high until the end of burst operation.
CKE DQS /DQS
AL + CL
DQ
out 0
out out 1 2
out 3
out 4
out out 5 6
out 7
BL=8
Data Sheet E1175E20 (Ver. 2.0)
67
EDE2508AEBG, EDE2516AEBG
Read with Auto Precharge to Power-Down Entry
T0 /CK CK Command CKE
DQS /DQS DQ
AL + CL out 0 out 1 out 2 out 3 READA BL=4 PRE AL + BL/2 with tRTP = 7.5ns and tRAS min. satisfied
T1
T2
Tx
Tx+1
Tx+2
Tx+3
Tx+4
Tx+5
Tx+6
Tx+7
Tx+8
Tx+9
CKE should be kept high until the end of burst operation.
T0
T1
T2
Tx
Tx+1
Tx+2
Tx+3
Tx+4
Tx+5
Tx+6
Tx+7
Tx+8
Tx+9
Start internal precharge
Command
CKE DQS /DQS
READA BL=8
AL + BL/2 with tRTP = 7.5ns and tRAS min. satisfied
PRE
CKE should be kept high until the end of burst operation.
AL + CL
DQ
out 0
out 1
out 2
out 3
out 4
out out 5 6
out 7
Write to Power-Down Entry
T0 /CK CK Command CKE
tWTR WRIT
T1
Tm
Tm+1 Tm+2
Tm+3 Tx
Tx+1
Tx+2
Tx+3
Tx+4
Tx+5
Tx+6
DQS /DQS DQ
WL in 0 in 1 in 2 in 3 BL=4
T0
T1
Tm
Tm+1
Tm+2 Tm+3
Tm+4 Tm+5
Tx
Tx+1
Tx+2
Tx+3
Tx+4
Command
CKE
WRIT
tWTR
DQS /DQS DQ
WL in 0 in 1 in 2 in 3 in 4 in 5 in 6 in 7
BL=8
Data Sheet E1175E20 (Ver. 2.0)
68
EDE2508AEBG, EDE2516AEBG
Write with Auto Precharge to Power-Down Entry
T0 T1 Tm Tm+1 Tm+2 Tm+3 Tx Tx+1 Tx+2 Tx+3 Tx+4 Tx+5 Tx+6
/CK CK Command
WRITA PRE
CKE
DQS /DQS DQ
WR*1
WL in 0 in 1 in 2 in 3 BL=4
T0
T1
Tm
Tm+1
Tm+2
Tm+3
Tm+4
Tm+5
Tx
Tx+1
Tx+2
Tx+3
Tx+4
/CK CK Command
WRITA PRE
CKE DQS /DQS DQ
WR*1
WL in 0 in 1 in 2 in 3 in 4 in 5 in 6 in 7 BL=8
Note: 1. WR is programmed through MRS
Data Sheet E1175E20 (Ver. 2.0)
69
EDE2508AEBG, EDE2516AEBG
Refresh command to Power-Down Entry
T0 /CK CK Command CKE
REF
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
CKE can go to low one clock after an auto-refresh command
Active command to power-down entry
Command CKE
ACT
CKE can go to low one clock after an active command
Precharge/Precharge all command to power-down entry
Command CKE
PRE or PALL
CKE can go to low one clock after a precharge or precharge all command
MRS/EMRS command to power-down entry
Command
MRS or EMRS
CKE
tMRD
Data Sheet E1175E20 (Ver. 2.0)
70
EDE2508AEBG, EDE2516AEBG
Asynchronous CKE Low Event DRAM requires CKE to be maintained high for all valid operations as defined in this data sheet. If CKE asynchronously drops low during any valid operation DRAM is not guaranteed to preserve the contents of array. If this event occurs, memory controller must satisfy DRAM timing specification tDELAY before turning off the clocks. Stable clocks must exist at the input of DRAM before CKE is raised high again. DRAM must be fully re-initialized (steps 4 through 13) as described in initialization sequence. DRAM is ready for normal operation after the initialization sequence. See AC Characteristics table for tDELAY specification
tCK /CK CK CKE tDELAY Stable clocks
CKE asynchronously drops low
Clocks can be turned off after this point
Data Sheet E1175E20 (Ver. 2.0)
71
EDE2508AEBG, EDE2516AEBG
Input Clock Frequency Change during Precharge Power-Down DDR2 SDRAM input clock frequency can be changed under following condition: DDR2 SDRAM is in precharged power-down mode. ODT must be turned off and CKE must be at logic low level. A minimum of 2 clocks must be waited after CKE goes low before clock frequency may change. SDRAM input clock frequency is allowed to change only within minimum and maximum operating frequency specified for the particular speed grade. During input clock frequency change, ODT and CKE must be held at stable low levels. Once input clock frequency is changed, stable new clocks must be provided to DRAM before precharge power-down may be exited and DLL must be RESET via EMRS after precharge power-down exit. Depending on new clock frequency an additional MRS command may need to be issued to appropriately set the WR, CL and soon. During DLL relock period, ODT must remain off. After the DLL lock time, the DRAM is ready to operate with new clock frequency. Clock Frequency Change in Precharge Power-Down Mode
T0 /CK CK Command CKE
NOP NOP NOP NOP DLL RESET NOP Valid
T1
T2
T4
Tx
Tx+1
Ty
Ty+1
Ty+2 Ty+3
Ty+4
Tz
Frequency change occurs here
200 clocks
ODT
tRP tAOFD tXP
Minmum 2 clocks required before changing frequency
ODT is off during DLL RESET Stable new clock before power down exit
Burst Interruption Interruption of a burst read or write cycle is prohibited. No Operation Command [NOP] The no operation command should be used in cases when the DDR2 SDRAM is in an idle or a wait state. The purpose of the no operation command is to prevent the DDR2 SDRAM from registering any unwanted commands between operations. A no operation command is registered when /CS is low with /RAS, /CAS, and /WE held high at the rising edge of the clock. A no operation command will not terminate a previous operation that is still executing, such as a burst read or write cycle. Deselect Command [DESL] The deselect command performs the same function as a no operation command. Deselect Command occurs when /CS is brought high at the rising edge of the clock, the /RAS, /CAS, and /WE signals become don't cares.
Data Sheet E1175E20 (Ver. 2.0)
72
EDE2508AEBG, EDE2516AEBG
Package Drawing
60-ball FBGA Solder ball: Lead free (Sn-Ag-Cu)
Unit: mm
8.0 0.1 INDEX MARK
0.2 S B
9.5 0.1
0.2 S A 0.2 S 1.20 max. S 0.1 S 0.35 0.05
B
60-0.45 0.05
0.15 M S A B
INDEX MARK
1.6 6.4
0.8
8.0
A
0.8
ECA-TS2-0225-01
Data Sheet E1175E20 (Ver. 2.0)
73
EDE2508AEBG, EDE2516AEBG
84-ball FBGA Solder ball: Lead free (Sn-Ag-Cu)
Unit: mm 8.0 0.1 INDEX MARK
0.2 S B
12.5 0.1
0.2 S A
0.2 S 1.20 max. S 0.1 S 0.35 0.05 B
84-0.45 0.05
0.15 M S A B
INDEX MARK
1.6 0.8 6.4 ECA-TS2-0224-01
Data Sheet E1175E20 (Ver. 2.0)
74
11.2
A
0.8
EDE2508AEBG, EDE2516AEBG
Recommended Soldering Conditions
Please consult with our sales offices for soldering conditions of the EDE25XXAEBG. Type of Surface Mount Device EDE2508AEBG: 60-ball FBGA < Lead free (Sn-Ag-Cu) > EDE2516AEBG: 84-ball FBGA < Lead free (Sn-Ag-Cu) >
Data Sheet E1175E20 (Ver. 2.0)
75
EDE2508AEBG, EDE2516AEBG
NOTES FOR CMOS DEVICES
1 PRECAUTION AGAINST ESD FOR MOS DEVICES
Exposing the MOS devices to a strong electric field can cause destruction of the gate oxide and ultimately degrade the MOS devices operation. Steps must be taken to stop generation of static electricity as much as possible, and quickly dissipate it, when once it has occurred. Environmental control must be adequate. When it is dry, humidifier should be used. It is recommended to avoid using insulators that easily build static electricity. MOS devices must be stored and transported in an anti-static container, static shielding bag or conductive material. All test and measurement tools including work bench and floor should be grounded. The operator should be grounded using wrist strap. MOS devices must not be touched with bare hands. Similar precautions need to be taken for PW boards with semiconductor MOS devices on it.
2 HANDLING OF UNUSED INPUT PINS FOR CMOS DEVICES
No connection for CMOS devices input pins can be a cause of malfunction. If no connection is provided to the input pins, it is possible that an internal input level may be generated due to noise, etc., hence causing malfunction. CMOS devices behave differently than Bipolar or NMOS devices. Input levels of CMOS devices must be fixed high or low by using a pull-up or pull-down circuitry. Each unused pin should be connected to VDD or GND with a resistor, if it is considered to have a possibility of being an output pin. The unused pins must be handled in accordance with the related specifications.
3 STATUS BEFORE INITIALIZATION OF MOS DEVICES
Power-on does not necessarily define initial status of MOS devices. Production process of MOS does not define the initial operation status of the device. Immediately after the power source is turned ON, the MOS devices with reset function have not yet been initialized. Hence, power-on does not guarantee output pin levels, I/O settings or contents of registers. MOS devices are not initialized until the reset signal is received. Reset operation must be executed immediately after power-on for MOS devices having reset function.
CME0107
Data Sheet E1175E20 (Ver. 2.0)
76
EDE2508AEBG, EDE2516AEBG
The information in this document is subject to change without notice. Before using this document, confirm that this is the latest version.
No part of this document may be copied or reproduced in any form or by any means without the prior written consent of Elpida Memory, Inc. Elpida Memory, Inc. does not assume any liability for infringement of any intellectual property rights (including but not limited to patents, copyrights, and circuit layout licenses) of Elpida Memory, Inc. or third parties by or arising from the use of the products or information listed in this document. No license, express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of Elpida Memory, Inc. or others. Descriptions of circuits, software and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. The incorporation of these circuits, software and information in the design of the customer's equipment shall be done under the full responsibility of the customer. Elpida Memory, Inc. assumes no responsibility for any losses incurred by customers or third parties arising from the use of these circuits, software and information. [Product applications] Be aware that this product is for use in typical electronic equipment for general-purpose applications. Elpida Memory, Inc. makes every attempt to ensure that its products are of high quality and reliability. However, users are instructed to contact Elpida Memory's sales office before using the product in aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment, medical equipment for life support, or other such application in which especially high quality and reliability is demanded or where its failure or malfunction may directly threaten human life or cause risk of bodily injury. [Product usage] Design your application so that the product is used within the ranges and conditions guaranteed by Elpida Memory, Inc., including the maximum ratings, operating supply voltage range, heat radiation characteristics, installation conditions and other related characteristics. Elpida Memory, Inc. bears no responsibility for failure or damage when the product is used beyond the guaranteed ranges and conditions. Even within the guaranteed ranges and conditions, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as fail-safes, so that the equipment incorporating Elpida Memory, Inc. products does not cause bodily injury, fire or other consequential damage due to the operation of the Elpida Memory, Inc. product. [Usage environment] Usage in environments with special characteristics as listed below was not considered in the design. Accordingly, our company assumes no responsibility for loss of a customer or a third party when used in environments with the special characteristics listed below. Example: 1) Usage in liquids, including water, oils, chemicals and organic solvents. 2) Usage in exposure to direct sunlight or the outdoors, or in dusty places. 3) Usage involving exposure to significant amounts of corrosive gas, including sea air, CL 2 , H 2 S, NH 3 , SO 2 , and NO x . 4) Usage in environments with static electricity, or strong electromagnetic waves or radiation. 5) Usage in places where dew forms. 6) Usage in environments with mechanical vibration, impact, or stress. 7) Usage near heating elements, igniters, or flammable items. If you export the products or technology described in this document that are controlled by the Foreign Exchange and Foreign Trade Law of Japan, you must follow the necessary procedures in accordance with the relevant laws and regulations of Japan. Also, if you export products/technology controlled by U.S. export control regulations, or another country's export control laws or regulations, you must follow the necessary procedures in accordance with such laws or regulations. If these products/technology are sold, leased, or transferred to a third party, or a third party is granted license to use these products, that third party must be made aware that they are responsible for compliance with the relevant laws and regulations.
M01E0706
Data Sheet E1175E20 (Ver. 2.0)
77

▲Up To Search▲

Price & Availability of EDE2508AEBG-6E-E

	To Download EDE2508AEBG-6E-E Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .