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| ISO-CMOS ST-BUSTM Family MT8981D Digital Switch Data Sheet Features * * * * * * * * Zarlink ST-BUS compatible 4-line x 32-channel inputs 4-line x 32-channel outputs 128 ports non-blocking switch Single power supply (+5 V) Low power consumption: 30 mW Typ. Microprocessor-control interface Three-state serial outputs Ordering Information MT8981DE 40 Pin PDIP MT8981DP 44 Pin PLCC MT8981DPR 44 Pin PLCC MT8981DP1 44 Pin PLCC* MT8981DPR1 44 Pin PLCC* *Pb Free Matte Tin February 2005 Tubes Tubes Tape & Reel Tubes Tape & Reel -40C to +85C Description This VLSI ISO-CMOS device is designed for switching PCM-encoded voice or data, under microprocessor control, in a modern digital exchange, PBX or Central Office. It provides simultaneous connections for up to 128 64 kbit/s channels. Each of the four serial inputs and outputs consist of 32 64 kbit/s channels multiplexed to form a 2048 kbit/s ST-BUS stream. In addition, the MT8981 provides microprocessor read and write access to individual ST-BUS channels. C4i F0i VDD VSS ODE STi0 STi1 STi2 STi3 Serial to Parallel Converter Data Memory Frame Counter Output MUX Parallel to Serial Converter STo0 STo1 STo2 STo3 Control Register Connection Memory Control Interface DS CS R/W A5/ A0 DTA D7/ D0 Figure 1 - Functional Block Diagram 1 Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 1997-2005, Zarlink Semiconductor Inc. All Rights Reserved. MT8981D Data Sheet NC STi2 STi1 STi0 DTA IC ODE STo0 STo1 STo2 NC STi3 IC IC IC IC VDD F0i C4i A0 A1 A2 7 8 9 10 11 12 13 14 15 16 17 39 38 37 36 35 34 33 32 31 30 29 STo3 IC IC IC IC VSS D0 D1 D2 D3 D4 NC A3 A4 A5 DS R/W CS D7 D6 D5 NC DTA STi0 STi1 STi2 STi3 IC IC IC IC VDD F0i C4i A0 A1 A2 A3 A4 A5 DS R/W 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 IC ODE STo0 STo1 STo2 STo3 IC IC IC IC VSS D0 D1 D2 D3 D4 D5 D6 D7 CS 18 19 20 21 22 23 24 25 26 27 28 6 5 4 3 2 1 44 43 42 41 40 44 PIN PLCC 40 PIN PLASTIC DIP Figure 2 - Pin Connections Pin Description Pin # 40 44 DIP PLCC Name DTA Description Data Acknowledgement (Open Drain Output). This is the data acknowledgement on the microprocessor interface. This pin is pulled low to signal that the chip has processed the data. A 909 , 1/4 W, resistor is recommended to be used as a pullup. 1 2 2-4 5 6-9 10 11 3-5 7 8-11 12 13 STi0- ST-BUS Input 0 to 2 (Inputs). These are the inputs for the 2048 kbit/s ST-BUS input streams. STi2 STi3 IC VDD F0i ST-BUS Input 3 (Input). These are the inputs for the 2048 kbit/s ST-BUS input streams. Internal Connections. Must be connected to VDD. Power Input. Positive Supply. Framing 0-Type (Input). This is the input for the frame synchronization pulse for the 2048 kbit/s ST-BUS streams. A low on this input causes the internal counter to reset on the next negative transition of C4i. 4.096 MHz Clock (Input). ST-BUS bit cell boundaries lie on the alternate falling edges of this clock. 12 14 C4i 13-15 15-17 A0-A2 Address 0 to 2 (Inputs). These are the inputs for the address lines on the microprocessor interface. 16-18 19-21 A3-A5 Address 3 to 5 (Inputs). These are the inputs for the address lines on the microprocessor interface 19 22 DS Data Strobe (Input). This is the input for the active high data strobe on the microprocessor interface. 2 Zarlink Semiconductor Inc. MT8981D Pin Description (continued) Pin # 40 44 DIP PLCC Data Sheet Name R/W CS Description Read or Write (Input). This is the input for the read/write signal on the microprocessor interface high for read, low for write. Chip Select (Input). This is the input for the active low chip select on the microprocessor interface. 20 21 23 24 22-24 25-27 D7-D5 Data 7 to 5 (Three-state I/O Pins). These are the bidirectional data pins on the microprocessor interface. 25-29 29-33 D4-D0 Data 4 to 0 (Three-state I/O Pins). These are the bidirectional data pins on the microprocessor interface. 30 34 VSS IC Power Input. Negative Supply (Ground). Internal Connections. Leave pins disconnected. 31-34 35-38 35 39 STo3 ST-BUS Output 3 (Three-state Outputs). These are the pins for the four 2048 kbit/s ST-BUS output streams. 36-38 41-43 STo2- ST-BUS Output 2 to 0 (Three-state Outputs). These are the pins for the four 2048 kbit/s ST-BUS STo0 output streams. 39 44 ODE Output Drive Enable (Input). If this input is held high, the STo0-STo3 output drivers function normally. If this input is low, the STo0-STo3 output drivers go into their high impedance state. NB: Even when ODE is high, channels on the STo0-STo3 outputs can go high impedance under software control. IC Internal Connection. Leave pin disconnected. 40 1 Functional Description In recent years, there has been a trend in telephony towards digital switching, particularly in association with software control. Simultaneously, there has been a trend in system architectures towards distributed processing or multi-processor systems. In accordance with these trends, Zarlink has devised the ST-BUS (Serial Telecom Bus). This bus architecture can be used both in software-controlled digital voice and data switching, and for interprocessor communications. The uses in switching and in interprocessor communications are completely integrated to allow for a simple general purpose architecture appropriate for the systems of the future. The serial streams of the ST-BUS operate continuously at 2048 kbit/s and are arranged in 125 s wide frames which contain 32 8-bit channels. Zarlink manufactures a number of devices which interface to the ST-BUS; a key device being the MT8981 chip. The MT8981 can switch data from channels on ST-BUS inputs to channels on ST-BUS outputs, and simultaneously allows its controlling microprocessor to read channels on ST-BUS inputs or write to channels on ST-BUS outputs (Message Mode). To the microprocessor, the MT8981 looks like a memory peripheral. The microprocessor can write to the MT8981 to establish switched connections between input ST-BUS channels and output ST-BUS channels, or to transmit messages on output ST-BUS channels. By reading from the MT8981, the microprocessor can receive messages from ST-BUS input channels or check which switched connections have already been established. By integrating both switching and interprocessor communications, the MT8981 allows systems to use distributed processing and to switch voice or data in an ST-BUS architecture. 3 Zarlink Semiconductor Inc. MT8981D Hardware Description Data Sheet Serial data at 2048 kbit/s is received at the four ST-BUS inputs (STi0 to STi3), and serial data is transmitted at the four ST-BUS outputs (STo0 to STo3). Each serial input accepts 32 channels of digital data, each channel containing an 8-bit word which may represent a PCM-encoded analog/voice sample as provided by a codec (e.g., Zarlink's MT8964). This serial input word is converted into parallel data and stored in the 128 X 8 Data Memory. Locations in the Data Memory are associated with particular channels on particular ST-BUS input streams. These locations can be read by the microprocessor which controls the chip. Locations in the Connection Memory, which is split into high and low parts, are associated with particular ST-BUS output streams. When a channel is due to be transmitted on an ST-BUS output, the data for the channel can either be switched from an ST-BUS input or it can originate from the microprocessor. If the data is switched from an input, then the contents of the Connection Memory Low location associated with the output channel is used to address the Data Memory. This Data Memory address corresponds to the channel on the input ST-BUS stream on which the data for switching arrived. If the data for the output channel originates from the microprocessor (Message Mode), then the contents of the Connection Memory Low location associated with the output channel are output directly, and this data is output repetitively on the channel once every frame until the microprocessor intervenes. The Connection Memory data is received, via the Control Interface, at D7 to D0. The Control Interface also receives address information at A5 to A0 and handles the microprocessor control signals CS, DTA, R/W and DS. There are two parts to any address in the Data Memory or Connection Memory. The higher order bits come from the Control Register, which may be written to or read from via the Control Interface. The lower order bits come from the address lines directly. The Control Register also allows the chip to broadcast messages on all ST-BUS outputs (i.e., to put every channel into Message Mode), or to split the memory so that reads are from the Data Memory and writes are to the Connection Memory Low. The Connection Memory High determines whether individual output channels are in Message Mode, and allows individual output channels to go into a high-impedance state, which enables arrays of MT8981s to be constructed. It also controls the CSTo pin. All ST-BUS timing is derived from the two signals C4i and F0i. 4 Zarlink Semiconductor Inc. MT8981D A5 0 1 1 * * * 1 A4 X 0 0 * * * 1 A3 X 0 0 * * * 1 A2 X 0 0 * * * 1 A1 X 0 0 * * * 1 A0 X 0 1 * * * 1 HEX ADDRESS 00 - 1F 20 21 * * * 3F LOCATION Control Register * Channel 0 Channel 1 * * * Channel 31 Data Sheet * Writing to the Control Register is the only fast transaction. Memory and stream are specified by the contents of the Control Register. Figure 3 - Address Memory Map Software Control The address lines on the Control Interface give access to the Control Register directly or, depending on the contents of the Control Register, to the High or Low sections of the Connection Memory or to the Data Memory. If address line A5 is low, then the Control Register is addressed regardless of the other address lines (see Fig. 3). If A5 is high, then the address lines A4-A0 select the memory location corresponding to channel 0-31 for the memory and stream selected in the Control Register. The data in the Control Register consists of mode control bits, memory select bits, and stream address bits (see Fig. 4). The memory select bits allow the Connection Memory High or Low or the Data Memory to be chosen, and the stream address bits define one of the ST-BUS input or output streams. Bit 7 of the Control Register allows split memory operation - reads are from the Data Memory and writes are to the Connection Memory Low. The other mode control bit, bit 6, puts every output channel on every output stream into active Message Mode; i.e., the contents of the Connection Memory Low are output on the ST-BUS output streams once every frame unless the ODE pin is low. In this mode the chip behaves as if bits 2 and 0 of every Connection Memory High location were 1, regardless of the actual values. 5 Zarlink Semiconductor Inc. MT8981D Data Sheet Mode Control Bits (unused) Memory Select Bits (unused) Stream Address Bits 7 6 5 4 3 2 1 0 Bit 7 Name Description Split Memory When 1, all subsequent reads are from the Data Memory and writes are to the Connection Memory Low, except when the Control Register is accessed again. When 0, the Memory Select bits specify the memory for subsequent operations. In either case, the Stream Address Bits select the subsection of the memory which is made available. Message Mode (unused) Memory Select Bits 0-0 - Not to be used 0-1 - Data Memory (read only from the microprocessor port) 1-0 - Connection Memory Low 1-1 - Connection Memory High Must be a 0. When 1, the contents of the Connection Memory Low are output on the Serial Output streams except when the ODE pin is low. When 0, the Connection Memory bits for each channel determine what is output. 6 5 4-3 2 1-0 (unused) Stream The number expressed in binary notation on these bits refers to the input or output ST-BUS stream Address Bits which corresponds to the subsection of memory made accessible for subsequent operations. Figure 4 - Control Register Bits 6 Zarlink Semiconductor Inc. MT8981D Data Sheet No Corresponding Memory - These bits give 0s if read. Per Channel Control Bits 7 6 5 4 3 2 1 0 Bit 2 Name Message Channel Description When 1, the contents of the corresponding location in Connection Memory Low are output on the location's channel and stream. When 0, the contents of the corresponding location in Connection Memory Low act as an address for the Data Memory and so determine the source of the connection to the location's channel and stream. 1 0 Unused Output Enable If the ODE pin is high and bit 6 of the Control Register is 0, then this bit enables the output driver for the location's channel and stream. This allows individual channels on individual streams to be made high-impedance, allowing switching matrices to be constructed. A 1 enables the driver and a 0 disables it. Figure 5 - Connection Memory High Bits (unused) Stream Address Bits Channel Address Bits 7 6 5 4 3 2 1 0 Bit 7 6-5* Name (Unused) Stream Address Bits* Channel Address Bits* Must be a 0. Description The number expressed in binary notation on these 2 bits is the number of the ST-BUS stream for the source of the connection. Bit 6 is the most significant bit. e.g., if bit 6 is 1, and bit 5 is 0, then the source of the connection is a channel on STi2. The number expressed in binary notation on these 5 bits is the number of the channel which is the source of the connection (The ST-BUS stream where the channel lies is defined by bits 6 and 5.). Bit 4 is the most significant bit. e.g., if bit 4 is 1, bit 3 is 0, bit 2 is 0, bit 1 is 1 and bit 0 is 1, then the source of the connection is channel 19. 4-0* *If bit 2 of the corresponding Connection High location is 1 or if bit 6 of the Control Register is 1, then these entire 8 bits are output on the channel and stream associated with this location. Otherwise, the bits are used as indicated to define the source of the connection which is output on the channel and stream associated with this location. Figure 6 - Connection Memory Low Bits 7 Zarlink Semiconductor Inc. MT8981D Data Sheet If bit 6 of the Control Register is 0, then bits 2 and 0 of each Connection Memory High location function normally (see Fig. 5). If bit 2 is 1, the associated ST-BUS output channel is in Message Mode; i.e., the byte in the corresponding Connection Memory Low location is transmitted on the stream at that channel. Otherwise, one of the bytes received on the serial inputs is transmitted and the contents of the Connection Memory Low define the STBUS input stream and channel where the byte is to be found (see Fig. 6). If the ODE pin is low, then all serial outputs are high-impedance. If it is high and bit 6 in the Control Register is 1, then all outputs are active. If the ODE pin is high and bit 6 in the Control Register is 0, then the bit 0 in the Connection Memory High location enables the output drivers for the corresponding individual ST-BUS output stream and channel. Bit 0=1 enables the driver and bit 0=0 disables it (see Fig. 5). Applications Use in a Simple Digital Switching System Fig. 7 and 8 show how MT8981s can be used with MT8964s to form a simple digital switching system. Fig. 7 shows the interface between the MT8981s and the filter/codecs. Fig. 8 shows the position of these components in an example architecture. The MT8964 filter/codec in Fig. 7 receives and transmits digitized voice signals on the ST-BUS input DR, and STBUS output DX, respectively. These signals are routed to the ST-BUS inputs and outputs on the top MT8981, which is used as a digital speech switch. STo0 STi0 8981 used as speech switch MT8981 DX DR DC STo0 STi0 8981 used in message mode for control and signalling MT8964 Filter/Codec Signalling Logic Line Driver and 2- to 4Wire Converter Line Interface Circuit with 8964 Filter/Codec MT8981 Figure 7 - Example of Typical Interface between 8981s and 8964s for Simple Digital Switching System The MT8964 is controlled by the ST-BUS input DC originating from the bottom MT8981, which generates the appropriate signals from an output channel in Message Mode. This architecture optimizes the messaging capability of the line circuit by building signalling logic, e.g., for on-off hook detection, which communicates on an ST-BUS output. This signalling ST-BUS output is monitored by a microprocessor (not shown) through an ST-BUS input on the bottom MT8981. 8 Zarlink Semiconductor Inc. MT8981D Data Sheet Fig. 8 shows how a simple digital switching system may be designed using the ST-BUS architecture. This is a private telephone network with 128 extensions which uses a single MT8981 as a speech switch and a second MT8981 for communication with the line interface circuits. A larger digital switching system may be designed by cascading a number of MT8981s. Fig. 9 shows how four MT8981s may be arranged in a non-blocking configuration which can switch any channel on any of the ST-BUS inputs to any channel on the ST-BUS outputs. Line Interface Circuit with Codec (e.g. 8964) 4 Speech Switch 8981 STi0-3 Line 1 4 STo0-3 Controlling MicroProcessor STo0-3 4 STi0-3 * * * Repeated for Lines 2 to 127 * * * Repeated for Lines 2 to 127 4 Control & Signalling 8981 Line Interface Circuit with Codec (e.g. 8964) Line 128 Figure 8 - Example Architecture of a Simple Digital Switching System 8981 #1 IN 0/3 STi0/3 STo0/3 OUT 0/3 8981 #2 STi0/3 STo0/3 OUT 4/7 8981 #3 IN 4/7 STi0/3 STo0/3 8981 #4 STi0/3 STo0/3 Figure 9 - Four 8981s Arranged in a Non-Blocking 8 x 8 Configuration 9 Zarlink Semiconductor Inc. MT8981D Application Circuit with 6802 Processor Fig. 10 shows an example of a complete circuit which may be used to evaluate the chip. Data Sheet For convenience, a 4 MHz crystal oscillator has been used rather than a 4.096 MHz clock, as both are within the limits of the chip's specifications. The RC delay used with the 393 counters ensures a sufficient hold time for the FP signal, but the values used may have to be changed if faster 393 counters become available. The chip is shown as memory mapped into the MEK6802D3 system. Chip addresses 00-3F correspond to processor addresses 2000-203F. Delay through the address decoder requires the VMA signal to be used twice to remove glitches. The MEK6802D3 board uses a 10 K pullup on the MR pin, which would have to be incorporated into the circuit if the board was replaced by a processor. 10 Zarlink Semiconductor Inc. MT8981D Data Sheet D7-D0 A15-A0 MEK6802D3 System R/W MR VMA E A15 A14 A13 0V 0V VMA 0V 1 2 3 4 5 6 7 8 MD 74 HCT 138 16 15 14 13 12 11 10 9 5V A12 A11 A10 0V 0V 0V 1 2 3 4 5 6 7 8 MD 74 HCT 138 16 15 14 13 12 11 10 9 5V 909 , 1/4W 5V 5V DTA STi0 STi1 STi2 STi3 STi4 STi5 STi6 STi7 VDD F0i C4i A0 A1 A2 A3 A4 A5 DS R/W 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 MT 8980 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 CSTo ODE STo0 STo1 STo2 STo3 STo4 STo5 STo6 STo7 VSS D0 D1 D2 D3 D4 D5 D6 D7 CS 5V A9 A8 A7 0V 0V 0V 0V 1 2 3 4 5 6 7 8 MD 74 HCT 138 16 15 14 13 12 11 10 9 5V A6 VMA 0V 0V 0V 0V 1 2 3 4 5 6 7 8 MD 74 HCT 138 16 15 14 13 12 11 10 9 5V C4i 0V 0V 1 2 3 4 5 6 7 SN 74 HCT 393 14 13 12 11 10 9 8 5V 0V 510 DTA CS 0V C4i 0V F0i 0V 0V 1 2 MD 3 74 4 HCT 5 240 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 5V 0V MR 5V 0V 0V 1 2 3 4 5 6 7 SN 74 HCT 393 14 13 12 11 10 9 8 5V 100pF 4 MHz 2M Figure 10 - Application Circuit with 6802 11 Zarlink Semiconductor Inc. MT8981D Absolute Maximum Ratings* Parameter 1 2 3 4 5 6 VDD - VSS Voltage on Digital Inputs Voltage on Digital Outputs Current at Digital Outputs Storage Temperature Package Power Dissipation VI VO IO TS PD -65 Symbol Min. -0.3 VSS-0.3 VSS-0.3 Data Sheet Max. 7 VDD+0.3 VDD+0.3 40 +150 2 Units V V V mA C W . * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Recommended Operating Conditions - Voltages are with respect to ground (VSS) unless otherwise stated. Characteristics 1 2 3 Operating Temperature Positive Supply Input Voltage Sym. TOP VDD VI Min. -40 4.75 0 Typ. Max. +85 5.25 VDD Units C V V Test Conditions Typical figures are at 25C and are for design aid only: not guaranteed and not subject to production testing. DC Electrical Characteristics - Voltages are with respect to ground (VSS) unless otherwise stated. Characteristics 1 2 3 4 5 6 7 8 9 10 11 I N P U T S O U T P U T S Supply Current Input High Voltage Input Low Voltage Input Leakage Input Pin Capacitance Output High Voltage Output High Current Output Low Voltage Output Low Current High Impedance Leakage Output Pin Capacitance Sym. IDD VIH VIL IIL CI VOH IOH VOL IOL IOZ CO 8 5 10 5 2.4 10 15 0.4 8 2.0 0.8 5 Min. Typ. 6 Max. 10 Units mA V V A pF V mA V mA A pF IOH = 10 mA Sourcing. VOH=2.4V IOL = 5 mA Sinking. VOL = 0.4V VO between VSS and VDD VI between VSS and VDD Test Conditions Outputs unloaded Typical figures are at 25C and are for design aid only: not guaranteed and not subject to production testing. 12 Zarlink Semiconductor Inc. MT8981D Data Sheet Test Point Output Pin CL VSS RL S1 S2 VDD S1 is open circuit except when testing output levels or high impedance states. S2 is switched to VDD or V SS when testing output levels or high impedance states. VSS Figure 11 - Output Test Load AC Electrical Characteristics - Clock Timing (Figures 12 and 13) Characteristics 1 2 3 4 5 6 7 I N P U T S Clock Period* Clock Width High Clock Width Low Clock Transition Time Frame Pulse Setup Time Frame Pulse Hold Time Frame Pulse Width Sym. tCLK tCH tCL tCTT tFPS tFPH tFPW 20 0.020 244 Min. 220 95 110 Typ. 244 122 122 20 200 50 Max. 300 150 150 Units ns ns ns ns ns s ns Test Conditions Timing is over recommended temperature & power supply voltages Typical figures are at 25C and are for design aid only: not guaranteed and not subject to production testing. * Contents of Connection Memory are not lost if the clock stops, however, ST-BUS outputs go into the high impedance state. NB: Frame Pulse is repeated every 512 cycles of C4i. C4i F0i BIT CELLS Channel 31 Bit o Channel 0 Bit 7 Figure 12 - Frame Alignment 13 Zarlink Semiconductor Inc. MT8981D tCLK tCL 2.0V C4i 0.8V tCHL tFPH F0i 2.0V 0.8V tFPW tFPS tCTT tFPH tFPS tCTT tCH Data Sheet Figure 13 - Clock Timing AC Electrical Characteristics - Serial Streams (Figures 11, 14, 15 and 16) Characteristics 1 2 3 4 5 6 7 8 9 I N O U T P U T S STo0/3 Delay - Active to High Z STo0/3 Delay - High Z to Active STo0/3 Delay - Active to Active STo0/3 Hold Time Output Driver Enable Delay External Control Hold Time External Control Delay Serial Input Setup Time Serial Input Hold Time Sym. tSAZ tSZA tSAA tSOH tOED tXCH tXCD tSIS tSIH 90 0 Min. 20 25 30 25 Typ. 50 60 65 45 45 50 75 -40 110 -20 125 Max. 80 125 125 Units ns ns ns ns ns ns ns ns ns Test Conditions RL=1 K*, CL=150 pF CL=150 pF CL=150 pF CL=150 pF RL=1 K*, CL=150 pF CL=150 pF CL=150 pF Timing is over recommended temperature & power supply voltages Typical figures are at 25C and are for design aid only: not guaranteed and not subject to production testing. * High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL. 14 Zarlink Semiconductor Inc. MT8981D Bit Cell Boundary 2.0V C4i 0.8V tSOH STo0 2.4V to STo3 0.4V tSAZ STo0 2.4V to STo3 0.4V Data Sheet * * tSZA tSOH STo0 2.4V to STo3 0.4V tSAA Figure 14 - Serial Outputs and External Control 2.0V ODE 0.8V STo0 2.4V to STo3 0.4V * tOED * Figure 15 - Output Driver Enable 15 Zarlink Semiconductor Inc. MT8981D Data Sheet Bit Cell Boundaries 2.0V C4i 0.8V tSIH STi0 2.0V to STi3 0.8V tSIS Figure 16 - Serial Inputs AC Electrical Characteristics - Processor Bus (Figures 11 and 17) Characteristics 1 2 3 4 5 6 7 8 9 10 11 12 13 Chip Select Setup Time Read/Write Setup Time Address Setup Time Acknowledgement Delay Fast Write Data Setup Time Slow Write Data Delay Read Data Setup Time Data Hold Time Read Write Read Data To High Impedance Chip Select Hold Time Read/Write Hold Time Address Hold Time Acknowledgement Hold Time Fast Slow Sym. tCSS tRWS tADS tAKD tAKD tFWS tSWD tRDS tDHT tDHT tRDZ tCSH tRWH tADH tAKH 0 0 0 10 60 80 20 20 10 50 90 2.7 20 2.0 1.7 0.5 Min. 20 25 25 Typ. 0 5 5 40 100 7.2 Max. Units ns ns ns ns cycles ns cycles cycles ns ns ns ns ns ns ns RL=1 K*, CL=150 pF RL=1 K*, CL=150 pF C4i cycles1 C4i cycles1, CL= 150 pF RL=1 K*, CL=150 pF CL=150 pF C4i cycles1 Test Conditions Timing is over recommended temperature & power supply voltages. Typical figures are at 25C and are for design aid only: not guaranteed and not subject to production testing. * High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL. Note 1: Processor accesses are dependent on the C4i clock, and so some timings are expressed as multiples of the C4i clock period. 16 Zarlink Semiconductor Inc. MT8981D 2.0V DS 0.8V Data Sheet 2.0V CS 0.8V tCSS 2.0V R/W 0.8V tRWS A5 to A0 2.0V 0.8V tADS 2.4V DTA 0.4V tAKD tAKH tADH tRWH tCSH * tRDS tDHT * D7 to D0 2.4V (Read) 2.0V (Write) 0.8V (Read 0.8V (Write) * tSWD tFWS tRDZ * Figure 17 - Processor Bus 17 Zarlink Semiconductor Inc. For more information about all Zarlink products visit our Web Site at www.zarlink.com Information relating to products and services furnished herein by Zarlink Semiconductor Inc. or its subsidiaries (collectively "Zarlink") is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. Neither the supply of such information or purchase of product or service conveys any license, either express or implied, under patents or other intellectual property rights owned by Zarlink or licensed from third parties by Zarlink, whatsoever. Purchasers of products are also hereby notified that the use of product in certain ways or in combination with Zarlink, or non-Zarlink furnished goods or services may infringe patents or other intellectual property rights owned by Zarlink. This publication is issued to provide information only and (unless agreed by Zarlink in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other information appearing in this publication are subject to change by Zarlink without notice. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. Manufacturing does not necessarily include testing of all functions or parameters. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to Zarlink's conditions of sale which are available on request. Purchase of Zarlink's I2C components conveys a licence under the Philips I2C Patent rights to use these components in and I2C System, provided that the system conforms to the I2C Standard Specification as defined by Philips. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright Zarlink Semiconductor Inc. All Rights Reserved. TECHNICAL DOCUMENTATION - NOT FOR RESALE |
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