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Features
* EE Reprogrammable 2,097,152 x 1 bit Serial Memories Designed to Store Configuration
Programs for Field Programmable Gate Arrays (FPGAs)
* In-System Programmable via 2-wire Bus * Simple Interface to SRAM FPGAs * Compatible with Atmel AT6000, AT40K FPGAs, Altera FLEX(R) Devices, * * * * * * * *
ORCA(R) FPGAs, Xilinx XC3000, XC4000, XC5200, Spartan(R), Virtex(R) FPGAs Cascadable Read Back to Support Additional Configurations or Future Higher-density Arrays Low-power CMOS EEPROM Process Programmable Reset Polarity Available in PLCC Package (Pin Compatible across Product Family) Emulation of Atmel's AT24CXXX Serial EEPROMs Available in 3.3V 10% LV and 5V 5% C Versions System-friendly READY Pin Low-power Standby Mode
Description
The AT17C020 and AT17LV020 (high-density AT17 Series) FPGA Configuration EEPROMs (Configurators) provide an easy-to-use, cost-effective configuration memory for Field Programmable Gate Arrays. The AT17 Series is packaged in the popular 20-pin PLCC. The AT17 Series family uses a simple serial-access procedure to configure one or more FPGA devices. The AT17 Series organization supplies enough memory to configure one or multiple smaller FPGAs. The user can select the polarity of the reset function by programming internal EEPROM bytes. These devices also support a system-friendly READY pin, which signifies a "good" power level to the FPGA and can be used to ensure reliable system power-up. The AT17 Series Configurators can be programmed with industry-standard programmers or Atmel's ATDH2200E Programming System.
2-megabit FPGA Configuration EEPROM Memory AT17C020 AT17LV020
Pin Configurations
PLCC
NC DATA NC VCC NC 3 2 1 20 19 NC GND NC NC NC 9 10 11 12 13 CLK NC RESET/OE NC CE 4 5 6 7 8 18 17 16 15 14 NC SER_EN NC READY CEO(A2)
Rev. 1239D-05/01
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Block Diagram
CEO (A2)
FPGA Master Serial Mode Summary
The I/O and logic functions of the FPGA and their associated interconnections are established by a configuration program. The program is loaded either automatically upon power-up, or on command, depending on the state of the FPGA mode pins. In Master Mode, the FPGA automatically loads the configuration program from an external memory. The AT17 Serial Configuration EEPROM has been designed for compatibility with the Master Serial Mode. This document discusses the AT40K FPGA interface. For more details or AT6K FPGA applications, please reference "AT40K Series Configuration" or "AT6000 Series Configuration" application notes.
Controlling the Highdensity AT17 Series Serial EEPROMs During Configuration
Most connections between the FPGA device and the AT17 Serial EEPROM are simple and self-explanatory: * * * * The DATA output of the AT17 Series Configurator drives DIN of the FPGA devices. The master FPGA CCLK output drives the CLK input of the AT17 Series Configurator. The CEO output of any AT17C/LV020 drives the CE input of the next AT17C/LV020 in a cascade chain of EEPROMs. SER_EN must be connected to VCC, (except during ISP).
The READY pin is available as an open-collector indicator of the device's RESET status; it is driven Low while the device is in its POWER-ON RESET cycle and released (tri-stated) when the cycle is complete. There are two different ways to use the inputs CE and OE.
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AT17C/LV020
AT17C/LV020
Condition 1
The simplest connection is to have the FPGA CON pin drive both CE and RESET/OE(1) in parallel. Due to its simplicity, however, this method will fail if the FPGA receives an external reset condition during the configuration cycle. If a system reset is applied to the FPGA, it will abort the original configuration and then reset itself for a new configuration, as intended. Of course, the AT17 Series Configurator does not see the external reset signal and will not reset its internal address counters and, consequently, will remain out of sync with the FPGA for the remainder of the configuration cycle.
Note: 1. For this condition, the reset polarity of the EEPROM must be set active High.
Figure 1. Condition 2 Connection
AT40K
RESET RESET D<0> CCLK CON INIT
AT17C/LV020
DATA CLK CE RESET/OE SER_EN
VCC
M2 M1 M0
GND
READY
Notes:
1. Use of the READY pin is optional. 2. Reset polarity must be set to active Low.
Condition 2
The FPGA CON pin drives only the CE input of the AT17 Series Configurator, while the OE input is driven by the FPGA INIT pin (Figure 1). This connection works under all normal circumstances, even when the user aborts a configuration before CON has gone High. A Low level on the RESET/OE(1) input - during FPGA reset - clears the Configurator's internal address pointer, so that the reconfiguration starts at the beginning.
Note: 1. For this condition, the reset polarity of the EEPROM must be set active Low.
The AT17 Series Configurator does not require an inverter for either condition since the RESET polarity is programmable.
Cascading Serial Configuration EEPROMs
For multiple FPGAs configured as a daisy-chain, or for future FPGAs requiring larger configuration memories, cascaded Configurators provide additional memory. As the last bit from the first Configurator is read, the clock signal to the Configurator asserts its CEO output Low and disables its DATA line driver. The second Configurator recognizes the Low level on its CE input and enables its DATA output. After configuration is complete, the address counters of all cascaded Configurators are reset if the RESET/OE on each Configurator is driven to its active (default High) level. If the address counters are not to be reset upon completion, then the RESET/OE inputs can be tied to its inactive (default Low) level. For more details on programming the EEPROM's reset polarity, please reference "Programming Specification for Atmel's FPGA Configuration EEPROMs".
AT17 Series Reset Polarity
The AT17 Series Configurator allows the user to program the reset polarity as either RESET/OE or RESET/OE. This feature is supported by industry standard programmer algorithms. For more details on programming the EEPROM's reset polarity, please ref-
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erence the "Programming Specification for Atmel's FPGA Configuration EEPROMs" application note.
Programming Mode
The programming mode is entered by bringing SER_EN Low. In this mode the chip can be programmed by the 2-wire serial bus. The programming is done at VCC supply only. Programming super voltages are generated inside the chip. See the "Programming Specification for Atmel's FPGA Configuration EEPROMs" application note for further information. The AT17C parts are read/write at 5V nominal. The AT17LV parts are read/write at 3.3V nominal. The AT17C/LV020 enters a low-power standby mode whenever CE is asserted High. In this mode, the Configurator consumes less than 0.5 mA of current at 5.0 volts with CMOS level inputs. The output remains in a high impedance state regardless of the state of the OE input.
Standby Mode
Pin Configurations
20-pin PLCC 2 4 6 Name DATA CLK RESET/OE I/O I/O I I Description Three-state DATA output for configuration. Open-collector bi-directional pin for programming. Clock input. Used to increment the internal address and bit counter for reading and programming. RESET/Output Enable input (when SER_EN is High). A Low level on both the CE and RESET/OE inputs enables the data output driver. A High level on RESET/OE resets both the address and bit counters. The logic polarity of this input is programmable as either RESET/OE or RESET/OE. This document describes the pin as RESET/OE. Chip Enable input. Used for device selection. A Low level on both CE and OE enables the data output driver. A High level on CE disables both the address and bit counters and forces the device into a low-power standby mode. Note that this pin will not enable/disable the device in the 2-wire Serial Programming Mode (i.e., when SER_EN is Low). Ground pin. A 0.2 F decoupling capacitor between VCC and GND is recommended. O Chip Enable Output. This signal is asserted Low on the clock cycle following the last bit read from the memory. It will stay Low as long as CE and OE are both Low. It will then follow CE until OE goes High. Thereafter, CEO will stay High until the entire EEPROM is read again. Device selection input, A2. This is used to enable (or select) the device during programming (i.e., when SER_EN is Low; see the "Programming Specification" application note for more details). Open collector reset state indicator. Driven Low during power-up reset, released when powerup is complete. (Recommend a 4.7 K pull-up on this pin if used). Serial enable must be held High during FPGA loading operations. Bringing SER_EN Low enables the 2-wire Serial Programming Mode. +3.3V/+5V power supply pin.
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CE
I
10
GND CEO
14 A2 I
15 17 20
READY SER_EN VCC
O I
4
AT17C/LV020
AT17C/LV020
Absolute Maximum Ratings*
Operating Temperature.................................. -55C to +125C Storage Temperature ..................................... -65C to +150C Voltage on Any Pin with Respect to Ground .............................-0.1V to VCC + 0.5V Supply Voltage (VCC) .........................................-0.5V to +7.0V Maximum Soldering Temp. (10 sec. @ 1/16 in.).............260C *NOTICE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those listed under Operating Conditions is not implied. Exposure to Absolute Maximum Ratings conditions for extended periods of time may affect device reliability.
Operating Conditions
AT17C020 Symbol Description Commercial Industrial Military Supply voltage relative to GND, -0C to +70C Supply voltage relative to GND, -40C to +85C Supply voltage relative to GND, -55C to +125C Min 4.75 4.5 4.5 Max 5.25 5.5 5.5 AT17LV020 Min/ 3.0 3.0 3.0 Max 3.6 3.6 3.6 Units V V V
VCC
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DC Characteristics
VCC = 5V 5% Commercial, 5V 10% Industrial/Military
Symbol VIH VIL VOH VOL VOH VOL VOH VOL ICCA IL ICCS1 ICCS2 Description High-level input voltage Low-level input voltage High-level output voltage (IOH = -4 mA) Low-level output voltage (IOL = +4 mA) High-level output voltage (IOH = -4 mA) Low-level output voltage (IOL = +4 mA) High-level output voltage (IOH = -4 mA) Low-level output voltage (IOL = +4 mA) Supply current, active mode Input or output leakage current (VIN = VCC or GND) Commercial Supply current, standby mode, CMOS Industrial/Military Supply current, standby mode, TTL Comm./Industrial 0.75 1.0 mA mA -20.0 3.7 Military 0.4 10.0 20.0 0.5 V mA A mA 3.76 Industrial 0.37 V V Commercial 0.32 V V Min 2.0 0.0 3.86 Max VCC 0.8 Units V V V
DC Characteristics
VCC = 3.3V 10%
Symbol VIH VIL VOH VOL VOH VOL VOH VOL ICCA IL ICCS Description High-level input voltage Low-level input voltage High-level output voltage (IOH = -2.5 mA) Low-level output voltage (IOL = +3 mA) High-level output voltage (IOH = -2 mA) Low-level output voltage (IOL = +3 mA) High-level output voltage (IOH = -2 mA) Low-level output voltage (IOL = +2.5 mA) Supply current, active mode Input or output leakage current (VIN = VCC or GND) Commercial Supply current, standby mode Industrial/Military 0.2 mA -2.00 2.4 Military 0.4 5.0 20.0 0.2 V mA A mA 2.4 Industrial 0.4 V V Commercial 0.4 V V Min 2.0 0.0 2.4 Max VCC 0.8 Units V V V
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AT17C/LV020
AT17C/LV020
AC Characteristics
CE
TSCE TSCE THCE
RESET/OE
TLC THC THOE
CLK
TOE TCE TCAC TOH TDF
DATA
TOH
AC Characteristics When Cascading
RESET/OE
CE
CLK
TCDF
DATA
LAST BIT
TOCK TOCE TOOE
FIRST BIT
CEO
TOCE
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.
AC Characteristics for AT17C020
VCC = 5V 5% Commercial, VCC = 5V 10% Industrial/Military
Commercial Symbol TOE(2) TCE
(2) (2)
Industrial/Military(1) Min Max 35.0 45.0 50.0 0.0 Units ns ns ns ns 50.0 20.0 20.0 25.0 0.0 20.0 12.5 ns ns ns ns ns ns MHz
Description OE to Data Delay CE to Data Delay CLK to Data Delay Data Hold From CE, OE or CLK CE or OE to Data Float Delay CLK Low Time CLK High Time CE Setup Time to CLK (to guarantee proper counting) CE Hold Time from CLK (to guarantee proper counting) OE High Time (guarantees counter is reset) MAX Input Clock Frequency
Min
Max 30.0 45.0 50.0
TCAC TOH
0.0 50.0 20.0 20.0 20.0 0.0 20.0 12.5
TDF(3) TLC THC TSCE THCE THOE FMAX Notes:
1. Preliminary specifications for military operating range only. 2. AC test load = 50 pF. 3. Float delays are measured with 5 pF AC loads. Transition is measured 200 mV from steady state active levels.
AC Characteristics for AT17C020 When Cascading
VCC = 5V 5% Commercial/VCC = 5V 10% Industrial/Military
Commercial Symbol TCDF (3) TOCK(2) TOCE(2) TOOE(2) FMAX Notes: Description CLK to Data Float Delay CLK to CEO Delay CE to CEO Delay RESET/OE to CEO Delay MAX Input Clock Frequency 12.5 Min Max 50.0 35.0 40.0 30.0 12.5 Industrial/Military(1) Min Max 50.0 40.0 80.0 30.0 Units ns ns ns ns MHz
1. Preliminary specifications for military operating range only. 2. AC test load = 50 pF. 3. Float delays are measured with 5 pF AC loads. Transition is measured 200 mV from steady state active levels.
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AT17C/LV020
AT17C/LV020
AC Characteristics for AT17LV020
VCC = 3.3V 10%
Commercial Symbol TOE(2) TCE
(2) (2)
Industrial/Military(1) Min Max 55.0 60.0 60.0 0.0 Units ns ns ns ns 50.0 25.0 25.0 35.0 0.0 25.0 7.5 ns ns ns ns ns ns MHz
Description OE to Data Delay CE to Data Delay CLK to Data Delay Data Hold From CE, OE or CLK CE or OE to Data Float Delay CLK Low Time CLK High Time CE Setup Time to CLK (to guarantee proper counting) CE Hold Time from CLK (to guarantee proper counting) OE High Time (guarantees counter is reset) MAX Input Clock Frequency
Min
Max 5.00 55.0 55.0
TCAC TOH
0.0 50.0 25.0 25.0 30.0 0.0 25.0 12.5
TDF(3) TLC THC TSCE THCE THOE FMAX Notes:
1. Preliminary specifications for military operating range only. 2. AC test load = 50 pF. 3. Float delays are measured with 5 pF AC loads. Transition is measured 200 mV from steady state active levels.
AC Characteristics for AT17LV020 When Cascading
VCC = 3.3V 10%
Commercial Symbol TCDF(3) TOCK(2) TOCE(2) TOOE(2) FMAX Notes: Description CLK to Data Float Delay CLK to CEO Delay CE to CEO Delay RESET/OE to CEO Delay MAX Input Clock Frequency 12.5 Min Max 50.0 50.0 40.0 35.0 7.5 Industrial/Military(1) Min Max 50.0 55.0 80.0 35.0 Units ns ns ns ns MHz
1. Preliminary specifications for military operating range only. 2. AC test load = 50 pF. 3. Float delays are measured with 5 pF AC loads. Transition is measured 200 mV from steady state active levels.
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Ordering Information - 5V Devices
Memory Size 2Mb Ordering Code AT17C020-10JC AT17C020-10JI Package 20J 20J Operation Range Commercial (0C to 70C) Industrial (-40C to 85C)
Ordering Information - 3.3V Devices
Memory Size 2Mb Ordering Code AT17LV020-10JC AT17LV020-10JI Package 20J 20J Operation Range Commercial (0C to 70C) Industrial (-40C to 85C)
Package Type
20J
20-lead, Plastic J-leaded Chip Carrier (PLCC)
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AT17C/LV020
AT17C/LV020
Packaging Information
20J, 20-lead, Plastic J-leaded Chip Carrier (PLCC) Dimensions in Inches and (Millimeters)
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(c) Atmel Corporation 2001. Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Atmel's Terms and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life support devices or systems. FLEX is the registered trademark of Altera Corporation. ORCA is the registered trademark of Lucent Technologies, Inc. Spartan and Virtex are the registered trademarks of Xilinx, Inc. Other terms and product names in this document may be trademarks of others. Printed on recycled paper.
1239D-05/01/xM

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