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3.3 VOLT TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
FEATURES:
* * * * * * * * * * * ** * *
IDT72V70190
256 x 256 channel non-blocking switching at 2.048 Mb/s Per-channel variable or constant throughput delay Automatic identification of ST-BUS(R)/GCI interfaces Accept 8 serial data streams of 2.048 Mb/s Automatic frame offset delay measurement Per-stream frame delay offset programming Per-channel high impedance output control Per-channel Processor Mode Control interface compatible to Intel/Motorola CPUs Connection memory block programming Available in 64-pin Thin Plastic Quad Flatpack (TQFP) and
64-pin Small Thin Quad Flatpack (STQFP) 3.3V Power Supply Operating Temperature Range -40C to +85C 3.3V I/O with 5V Tolerant Inputs
DESCRIPTION:
The IDT72V70190 is a non-blocking digital switch that has a capacity of 256 x 256 channels at 2.048 Mb/s. Some of the main features are: programmable stream and channel control, Processor Mode, input offset delay and highimpedance output control. Per-stream input delay control is provided for managing large multi-chip switches that transport both voice channel and concatenated data channels. In addition, input streams can be individually calibrated for input frame offset.
FUNCTIONAL BLOCK DIAGRAM
VCC GND RESET
ODE
Loopback
RX0 RX1 RX2 RX3 RX4 RX5 RX6 RX7 TX0
Receive Serial Data Streams
Data Memory
Output MUX Transmit Serial Data Streams Connection Memory
TX1 TX2 TX3 TX4 TX5
Internal Registers
TX6 TX7
Timing Unit
Microprocessor Interface
CLK
F0i
FE
IC
AS/ IM DS/ RD ALE
CS R/W/ A0-A7 DTA D8-D15/ WR AD0-AD7
CCO
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IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The ST-BUS is a trademark of Mitel Corp.
MARCH 2003
DSC-5717/4
1
2003 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
PIN CONFIGURATIONS
GND
GND
CCO
ODE
VCC
DTA
51
TX7
TX6
TX5
TX4
TX3
TX2
TX1
TX0
D15
50
PIN 1
64 63 62 61 57 56 55 54 59 58 53 52 60 49
GND RX0 RX1 RX2 RX3 RX4 RX5 RX6 RX7 F0i FE GND CLK VCC DNC DNC
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
29 30 17 18 19 20 24 25 26 27 22 23 28 31 21 32
D14
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
D13 D12 D11 D10 D9 D8 GND VCC AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0
R/W/RW
AS/ALE
RESET
DS/RD
GND
CS
A0
A3
A4
A1
A2
A5
A6
A7
IM
IC
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TQFP 0.80 pitch, 14mm x 14mm (PN64-1, order code: PF) STQFP 0.50 pitch, 10mm x 10mm (PP64-1, order code: TF) TOP VIEW
NOTES: 1. DNC - Do Not Connect. 2. All I/O pins are 5V tolerant. 3. IC - Internal Connection, tie to Ground for normal operation.
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IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
PIN DESCRIPTION
SYMBOL
GND Vcc TX0-7 RX0-7 F0i FE CLK RESET
NAME
Ground. Vcc TX Output 0 to 7 (Three-state Outputs) RX Input 0 to 7 Frame Pulse Frame Evaluation Clock Device Reset (Schmitt Trigger Input)
I/O
DESCRIPTION
Ground Rail. +3.3 Volt Power Supply. Serial data output stream. These streams have a data rate of 2.048 Mb/s. Serial data input stream. These streams have a data rate of 2.048 Mb/s. This input accepts and automatically identifies frame synchronization signals formatted according to ST-BUS(R) and GCI specifications. This pin is the frame measurement input. Serial clock for shifting data in/out on the serial streams (RX/TX 0-7). This input accepts a 4.096 MHz clock. This input (active LOW) puts the IDT72V70190 in its reset state that clears the device internal counters, registers and brings TX0-7 and microport data outputs to a high-impedance state. The time constant for a power up reset circuit must be a minimum of five times the rise time of the power supply. In normal operation, the RESET pin must be held LOW for a minimum of 100ns to reset the device. When non-multiplexed CPU bus operation is selected, these lines provide the A0-A7 address lines to the internal memories. For Motorola multiplexed bus operation, this input is DS. This active HIGH DS input works in conjunction with CS to enable the read and write operations. For Motorola non-multiplexed CPU bus operation, this input is DS. This active LOW input works in conjunction with CS to enable the read and write operations. For Intel multiplexed bus operation, this input is RD. This active LOW input sets the data bus lines (AD0-7, D8-15) as outputs. In the cases of Motorola non-multiplexed and multiplexed bus operations, this input is R/W. This input controls the direction of the data bus lines (AD0-7, D8-15) during a microprocessor access. For Intel multiplexed bus operation, this input is WR. This active LOW input is used with RD to control the data bus (AD0-7) lines as inputs. Active LOW input used by a microprocessor to activate the microprocessor port of IDT72V70190. This input is used if multiplexed bus operation is selected via the IM input pin. For Motorola non-multiplexed bus operation, connect this pin to ground. When IM is HIGH, the microprocessor port is in the multiplexed mode. When IM is LOW, the microprocessor port is in non-multiplexed mode. These pins are the eight least significant data bits of the microprocessor port. In multiplexed mode, these pins are also the input address bits of the microprocessor port. These pins are the eight most significant data bits of the microprocessor port. This active LOW output signal indicates that a data bus transfer is complete. When the bus cycle ends, this pin drives HIGH and then goes high-impedance, allowing for faster bus cycles with a weaker pull-up resistor. A pull-up resistor is required to hold a HIGH level when the pin is in high-impedance. This is a 4.096 Mb/s output containing 512 bits per frame respectively. The level of each bit is determined by the CCO bit in the connection memory. See External Drive Control Section. This is the output enable control for the TX0 to TX7 serial outputs. When ODE input is LOW and the OSB bit of the IMS register is LOW, TX0-7 are in a high-impedance state. If this input is HIGH, the TX0-7 output drivers are enabled. However, each channel may still be put into a high-impedance state by using the per channel control bit in the connection memory.
O I I I I I
A0-7 DS/RD
Address 0-7 Data Strobe/Read
I I
R/W / WR Read/Write / Write
I
CS AS/ALE IM AD0-7 D8-15 DTA
Chip Select Address Strobe or Latch Enable CPU Interface Mode
I I I
Address/Data Bus 0 to 7 I/O Data Bus 8-15 Data Transfer Acknowledgment Control Output Output Drive Enable I/O O
CCO ODE
O I
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IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
FUNCTIONAL DESCRIPTION
The IDT72V70190 is capable of switching 256 x 256, 64 Kbit/s PCM or N x 64 Kbit/s channel data. The device maintains frame integrity in data applications and minimum throughput delay for voice applications on a per channel basis. The serial input streams of the IDT72V70190 can have a bit rate of 2.048 Mb/s and are arranged in 125s wide frames, which contain 32 channels respectively. The data rates on input and output streams are identical. In Processor Mode, the microprocessor can access input and output timeslots on a per channel basis allowing for transfer of control and status information. The IDT72V70190 automatically identifies the polarity of the frame synchronization input signal and configures the serial streams to either ST-BUS(R) or GCI formats. With the variety of different microprocessor interfaces, IDT72V70190 has provided an Input Mode pin (IM) to help integrate the device into different microprocessor based environments: Non-multiplexed or Multiplexed. These interfaces provide compatibility with multiplexed and Motorola non-multiplexed buses. The device can also resolve different control signals eliminating the use of glue logic necessary to convert the signals (R/W/WR, DS/RD, AS/ALE). The frame offset calibration function allows users to measure the frame offset delay using a frame evaluation pin (FE). The input offset delay can be programmed for individual streams using internal frame input offset registers, see Table 8. The internal loopback allows the TX output data to be looped around to the RX inputs for diagnostic purposes. A functional Block Diagram of the IDT72V70190 is shown in Figure 1. DATA AND CONNECTION MEMORY The received serial data is converted to parallel format by internal serialto-parallel converters and stored sequentially in the data memory. The 8KHz input frame pulse (F0i) is used to generate channel and frame boundaries of the input serial data. Depending on the interface mode select (IMS) register, the usable data memory may be as large as 256 bytes. Data to be output on the serial streams (TX0-7) may come from either the data memory or connection memory. For data output from data memory (connection mode), addresses in the connection memory are used. For data to be output from connection memory, the connection memory control bits must set the particular TX output in Processor Mode. One time-slot before the data is to be output, data from either connection memory or data memory is read internally. This allows enough time for memory access and parallel-to-serial conversion. CONNECTION AND PROCESSOR MODES In the Connection Mode, the addresses of the input source data for all output channels are stored in the connection memory. The connection memory is mapped in such a way that each location corresponds to an output channel on the output streams. For details on the use of the source address data (CAB and SAB bits), see Table 10. Once the source address bits are programmed by the microprocessor, the contents of the data memory at the selected address are transferred to the parallel-to-serial converters and then onto a TX output stream. By having the each location in the connection memory specify an input channel, multiple outputs can specify the same input address. This can be a powerful tool used for broadcasting data. In Processor Mode, the microprocessor writes data to the connection memory. Each location in the connection memory corresponds to a particular output stream and channel number and is transferred directly to the parallel-toserial converter one time-slot before it is to be output. This data will be output
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on the TX streams in every frame until the data is changed by the microprocessor. As the IDT72V70190 can be used in a wide variety of applications, the device also has memory locations to control the outputs based on operating mode. Specifically, the IDT72V70190 provides five per-channel control bits for the following functions: processor or connection mode, constant or variable delay, enables/three-state the TX output drivers and enables/disable the loopback function. In addition, one of these bits allows the user to control the CCO output. If an output channel is set to a high-impedance state through the connection memory, the TX output will be in a high-impedance state for the duration of that channel. In addition to the per-channel control, all channels on the ST-BUS(R) outputs can be placed in a high impedance state by either pulling the ODE input pin low or programming the Output Stand-By (OSB) bit in the interface mode selection register. This action overrides the per-channel programming in the connection memory bits. The connection memory data can be accessed via the microprocessor interface. The addressing of the devices internal registers, data and connection memories is performed through the address input pins and the Memory Select (MS) bit of the control register. For details on device addressing, see Software Control and Control Register bits description (Table 3 and 5). SERIAL DATA INTERFACE TIMING The master clock frequency must always be twice the data rate. For serial data rates of 2.048 Mb/s, the master clock (CLK) must be at 4.096 MHz. The input and output stream data rates will always be identical. The input 8 KHz frame pulse can be in either ST-BUS(R) or GCI format. The IDT72V70190 automatically detects the presence of an input frame pulse and identifies it as either ST-BUS(R) or GCI. In ST-BUS(R) format, every second falling edge of the master clock marks a bit boundary and the data is clocked in on the rising edge of CLK, three quarters of the way into the bit cell, see Figure 7. In GCI format, every second rising edge of the master clock marks the bit boundary and data is clocked in on the falling edge of CLK at three quarters of the way into the bit cell, see Figure 8. INPUT FRAME OFFSET SELECTION Input frame offset selection allows the channel alignment of individual input streams to be offset with respect to the output stream channel alignment (i.e. F0i). Although all input data comes in at the same speed, delays can be caused by variable path serial backplanes and variable path lengths which may be implemented in large centralized and distributed switching systems. Because data is often delayed, this feature is useful in compensating for the skew between clocks. Each input stream can have its own delay offset value by programming the frame input offset registers (FOR). The maximum allowable skew is +4.5 master clock (CLK) periods forward with resolution of 1/2 clock period. The output frame offset cannot be offset or adjusted. See Figure 5, Table 8 and 9 for delay offset programming. SERIAL INPUT FRAME ALIGNMENT EVALUATION The IDT72V70190 provides the frame evaluation (FE) input to determine different data input delays with respect to the frame pulse F0i. A measurement cycle is started by setting the start frame evaluation (SFE) bit low for at least one frame. When the SFE bit in the IMS register is changed from low to high, the evaluation starts. Two frames later, the complete frame evaluation (CFE) bit of the frame alignment register (FAR) changes from low to high to signal that a valid offset measurement is ready to be read from bits 0 to 11 of the FAR register. The SFE bit must be set to zero before a new
IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
measurement cycle started. In ST-BUS(R) mode, the falling edge of the frame measurement signal (FE) is evaluated against the falling edge of the ST-BUS(R) frame pulse. In GCI mode, the rising edge of FE is evaluated against the rising edge of the GCI frame pulse. See Table 7 and Figure 4 for the description of the frame alignment register. MEMORY BLOCK PROGRAMMING The IDT72V70190 provides users with the capability of initializing the entire connection memory block in two frames. To set bits 11 to 15 of every connection memory location, first program the desired pattern in bits 5 to 9 of the IMS register. The block programming mode is enabled by setting the memory block program (MBP) bit of the control register high. When the block programming enable (BPE) bit of the IMS register is set to high, the block programming data will be loaded into the bits 11 to 15 of every connection memory location. The other connection memory bits (bit 0 to bit 10) are loaded with zeros. When the memory block programming is complete, the device resets the BPE bit to zero. LOOPBACK CONTROL The loopback control (LPBK) bit of each connection memory location allows the TX output data to be looped backed internally to the RX input for diagnostic purposes. If the LPBK bit is high, the associated TX output channel data is internally looped back to the RX input channel (i.e., data from TX n channel m routes to the RX n channel m internally); if the LPBK bit is low, the loopback feature is disabled. For proper per-channel loopback operation, the contents of frame delay offset registers must be set to zero.
delay mode will be one frame. For example, when input time-slot 31 is switched to output time-slot 0. The maximum delay of 94 time-slots of delay occurs when time-slot 0 in a frame is switched to time-slot 31 in the frame. See Table 2.
MICROPROCESSOR INTERFACE
The IDT72V70190 provides a parallel microprocessor interface for multiplexed or non-multiplexed bus structures. This interface is compatible with Motorola non-multiplexed and multiplexed buses. If the IM pin is low a Motorola non-multiplexed bus should be connected to the device. If the IM pin is high, the device monitors the AS/ALE and DS/RD to determine what mode the IDT72V70190 should operate in. If DS/RD is low at the rising edge of AS/ALE, then the mode 1 multiplexed timing is selected. If DS/RD is high at the rising edge of AS/ALE, then the mode 2 multiplexed bus timing is selected. For multiplexed operation, the required signals are the 8-bit data and address (AD0-AD7), 8-bit Data (D8-D15), Address strobe/Address latch enable (AS/ ALE), Data strobe/Read (DS/RD), Read/Write /Write (R/W / WR), Chip select (CS) and Data transfer acknowledge (DTA). See Figure 11 and Figure 12 for multiplexed parallel microport timing. For the Motorola non-multiplexed bus, the required signals are the 16-bit data bus (AD0-AD7, D8-D15), 8-bit address bus (A0-A7) and 4 control lines (CS, DS, R/W and DTA). See Figure 13 and 14 for Motorola non-multiplexed microport timing. The IDT72V70190 microport provides access to the internal registers, connection and data memories. All locations provide read/write access except for the data memory and the frame alignment register which are read only. MEMORY MAPPING The address bus on the microprocessor interface selects the internal registers and memories of the IDT72V70190. If the A7 address input is low, then A6 through A0 are used to address the interface mode selection (IMS), control (CR), frame alignment (FAR) and frame input offset (FOR) registers (Table 4). If the A7 is high, A6 and A5 are low, then A4 through A0 are used to select 32 locations corresponding to data rate of the ST-BUS(R). The address input lines and the stream address bits (STA) of the control register allow access to the entire data and connection memories. The control and IMS registers together control all the major functions of the device, see Figure 3. As explained in the Serial Data Interface Timing and Switching Configurations sections, after system power-up, the IMS register should be programmed immediately to establish the desired switching configuration. The data in the control register consists of the memory block programming bit (MBP), the memory select bit (MS) and the stream address bits (STA). As explained in the Memory Block Programming section, the MBP bit allows the entire connection memory block to be programmed. The memory select bit is used to designate the connection memory or the data Memory. The stream address bits select internal memory subsections corresponding to input or output serial streams. The data in the IMS register consists of block programming bits (BPD0BPD4), block programming enable bit (BPE), output stand by bit (OSB) and start frame evaluation bit (SFE). The block programming and the block programming enable bits allows users to program the entire connection memory (see Memory Block Programming section). If the ODE pin is low, the OSB bit enables (if high) or disables (if low) all ST-BUS(R) output drivers. If the ODE pin is high, the contents of the OSB bit is ignored and all TX output drivers are enabled.
DELAY THROUGH THE IDT72V70190
The switching of information from the input serial streams to the output serial streams results in a throughput delay. The device can be programmed to perform time-slot interchange functions with different throughput delay capabilities on the per-channel basis. For voice applications, variable throughput delay is best as it ensures minimum delay between input and output data. In wideband data applications, constant throughput delay is best as the frame integrity of the information is maintained through the switch. The delay through the device varies according to the type of throughput delay selected in the V/C bit of the connection memory. VARIABLE DELAY MODE (V/C BIT = 0) In this mode, the delay is dependent only on the combination of source and destination channels and is independent of input and output streams. The minimum delay achievable in the IDT72V70190 is three time-slots. If the input channel data is switched to the same output channel (channel n, frame p), it will be output in the following frame (channel n, frame p+1). The same is true if input channel n is switched to output channel n+1 or n+2. If the input channel n is switched to output channel n+3, n+4,..., the new output data will appear in the same frame. Table 1 shows the possible delays for the IDT72V70190 in the variable delay mode. CONSTANT DELAY MODE (V/C BIT = 1) In this mode, frame integrity is maintained in all switching configurations by making use of a multiple data memory buffer. Input channel data is written into the data memory buffers during frame n will be read out during frame n+2. In the IDT72V70190, the minimum throughput delay achievable in the constant
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IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
CONNECTION MEMORY CONTROL The CCO pin is a 4.096 Mb/s output, which carries 512 bits. The contents of the CCO bit of each connection memory location are output on the CCO pin once every frame. The contents of the CCO bits of the connection memory are transmitted sequentially on to the CCO pin (2 bit cells for each bit in connection memory) and are synchronous with the data rates on the other serial streams. The CCO bit is output one channel before the corresponding channel on the serial streams. If the ODE pin or the OSB bit is high, the OE bit of each connection memory location controls the output drivers-enables (if high) or disables (if low). See Table 4 for detail. The processor channel (PC) bit of the connection memory selects between Processor Mode and Connection Mode. If high, the contents of the connection memory are output on the TX streams. If low, the stream address bit (SAB) and the channel address bit (CAB) of the connection memory defines the source information (stream and channel) of the time-slot that will be switched to the output
from data memory. The V/C (Variable/Constant Delay) bit in each connection memory location allows the per-channel selection between variable and constant throughput delay modes. If the LPBK bit is high, the associated TX output channel data is internally looped back to the RX input channel (i.e., RX n channel m data comes from the TX n channel m). If the LPBK bit is low, the loopback feature is disabled. For proper per-channel loopback operation, the contents of the frame delay offset registers must be set to zero.
INITIALIZATION OF THE IDT72V70190
After power up, the state of the connection memory is unknown. As such, the outputs should be put in high impedance by holding the ODE low. While the ODE is low, the microprocessor can initialize the device, program the active paths, and disable unused outputs by programming the OE bit in connection memory. Once the device is configured, the ODE pin (or OSB bit depending on initialization) can be switched.
Control Register
CRb7
CRb6
CRb5
CRb4
CRb3
CRb2
CRb1
CRb0
CRb4 0 1
The Control Register is only accessed when A7-A0 are all zeroed. When A7 =1, up to 32 bytes are randomly accessable via A0-A4 at any one instant. Of which stream these bytes (channels) are accessed is determined by the state of CRb2 -CRb0.
Connection Memory
Data Memory Channel 0 Channel 0 Channel 0 Channel 0 Channel 0 Channel 0 Channel 0 Channel 0 Channel 1 Channel 1 Channel 1 Channel 1 Channel 1 Channel 1 Channel 1 Channel 1 Channel 2 Channel 2 Channel 2 Channel 2 Channel 2 Channel 2 Channel 2 Channel 2 Channel 31 Channel 31 Channel 31 Channel 31 Channel 31 Channel 31 Channel 31 Channel 31
CRb2 0 0 0 0 1 1 1 1
CRb1 0 0 1 1 0 0 1 1
CRb0 Stream 0 0 1 1 2 0 1 3 0 4 1 5 0 6 1 7
10000000
10000001
10000010
10011111
Figure 3. Addressing Internal Memories 6
External Address Bits A7-A0
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IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
TABLE 1 -- VARIABLE THROUGHPUT DELAY VALUE
Input Rate Delay for Variable Throughput Delay Mode (m - output channel number) (n - input channel number) m n+2 2.048 Mb/s 32 - (n-m) time-slots m-n + 32 time-slots m-n time-slots
TABLE 2 -- CONSTANT THROUGHPUT DELAY VALUE
Input Rate 2.048 Mb/s Delay for Constant Throughput Delay Mode (m - output channel number) (n - input channel number) 32 + (32 - n) + m time-slots
TABLE 3 -- INTERNAL REGISTER AND ADDRESS MEMORY MAPPING
A7(1) 0 0 0 0 0 1 1 1 1 1 A6 0 0 0 0 0 0 0 0 0 0 A5 0 0 0 0 0 0 0 0 0 0 A4 0 0 0 0 0 0 0 . 1 1 A3 0 0 0 0 0 0 0 . 1 1 A2 0 0 0 0 1 0 0 . 1 1 A1 0 0 1 1 0 0 0 . 1 1 A0 0 1 0 1 0 0 1 . 0 1 Location Control Register, CR Interface Mode Selection Register, IMS Frame Alignment Register, FAR Frame Input Offset Register 0, FOR0 Frame Input Offset Register 1, FOR1 Ch0 Ch1 . Ch30 Ch31
NOTE: 1. Bit A7 must be high for access to data and connection memory positions. Bit A7 must be low for access to registers.
TABLE 4 -- OUTPUT HIGH IMPEDANCE CONTROL
OE bit in Connection Memory 0 1 1 1 1 ODE pin Don't Care 0 0 1 1 OSB bit in IMS Register Don't Care 0 1 1 0 TX Output Driver Status Per Channel High-Impedance High-Impedance Enable Enable Enable
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IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
TABLE 5 -- CONTROL REGISTER (CR) BITS
Read/Write Address: Reset Value: 15 0 Bit 15-6 5 4 14 0 13 0 00H. 0000H. 12 0 11 0 10 0 9 0 8 0 7 0 6 0 5 MBP 4 MS 3 0 2 1 0
STA2 STA1 STA0
Name Unused MBP (Memory Block Program) MS (Memory Select) Unused STA2-0 (Stream Address Bits)
Description Must be zero for normal operation. When 1, the connection memory block programming feature is ready for the programming of Connection Memory high bits, bit 11 to bit 15. When 0, this feature is disabled. When 0, connection memory is selected for read or write operations. When 1, the data memory is selected for read operations and connection memory is selected for write operations. (No microprocessor write operation is allowed for the data memory). Must be zero for normal operation. The binary value expressed by these bits refers to the input or output data stream, which corresponds to the subsection of memory made accessible for subsequent operations. (STA2 = MSB, STA0 = LSB)
3 2-0
TABLE 6 -- INTERFACE MODE SELECTION (IMS) REGISTER BITS
Read/Write Address: Reset Value: 15 0 14 0 13 0 01H, 0000H. 12 0 11 0 10 0 9 8 7 6 5 4 BPE 3 OSB 2 SFE 1 0 0 0
BPD4 BPD3 BPD2 BPD1 BPD0
Bit 15-10 9-5 Unused
Name Must be zero for normal operation. BPD4-0 (Block Programming Data)
Description These bits carry the value to be loaded into the connection memory block whenever the memory block programming feature is activated. After the MBP bit in the control register is set to 1 and the BPE bit is set to 1, the contents of the bits BPD4-0 are loaded into bit 15 and 11 of the connection memory. Bit 10 to bit 0 of the connection memory are set to 0. A zero to one transition of this bit enables the memory block programming function. The BPE and BPD4-0 bits in the IMS register have to be defined in the same write operation. Once the BPE bit is set HIGH, the device requires two frames to complete the block programming. After the programming function has finished, the BPE bit returns to zero to indicate the operation is completed. When the BPE = 1, the BPE or MBP can be set to 0 to abort to ensure proper operation. When BPE = 1, the other bit in the IMS register must not be changed for two frames to ensure proper operation. When ODE = 0 and OSB = 0, the output drivers of TX0 to TX7 are in high impedance mode. When ODE= 0 and OSB = 1, the output driver of TX0 to TX7 function normally. When ODE = 1, TX0 to TX7 output drivers function normally. A zero to one transition in this bit starts the frame evaluation procedure. When the CFE bit in the FAR register changes from zero to one, the evaluation procedure stops. To start another fame evaluation cycle, set this bit to zero for at least one frame. Must be zero for normal operation.
4
BPE (Begin Block Programming Enable)
3
OSB (Output Stand By) SFE (Start Frame Evaluation) Unused
2
1-0
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IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
TABLE 7 -- FRAME ALIGNMENT REGISTER (FAR) BITS
Read/Write Address: Reset Value: 15 0 Bit 15-13 12 11 10-0 14 0 13 0 02H. 0000H. 12 CFE 11 10 9 FD9 8 FD8 7 FD7 6 FD6 5 FD5 4 FD4 3 FD3 2 FD2 1 FD1 0 FD0
FD11 FD10
Name Unused CFE (Complete Frame Evaluation) FD11 (Frame Delay Bit 11) FD10-0 (Frame Delay Bits)
Description Must be zero for normal operation. When CFE = 1, the frame evaluation is completed and bits FD10 to FD0 bits contains a valid frame alignment offset. This bit is reset to zero, when SFE bit in the IMS register is changed from 1 to 0. The falling edge of FE (or rising edge for GCI mode) is sampled during the CLK-high phase (FD11 = 1) or during the CLK-low phase (FD11 = 0). This bit allows the measurement resolution to 1/2 CLK cycle. The binary value expressed in these bits refers to the measured input offset value. These bits are rest to zero when the SFE bit of the IMS register changes from 1 to 0. (FD10 - MSB, FD0 - LSB)
ST-BUS Frame
CLK
Offset Value
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
FE Input
(FD[10:0] = 06H) (FD11 = 0, sample at CLK LOW phase)
GCI Frame
CLK
Offset Value
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
FE Input
(FD[10:0] = 09H) (FD11 = 1, sample at CLK HIGH phase)
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Figure 4. Example for Frame Alignment Measurement 9
IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
TABLE 8 -- FRAME INPUT OFFSET REGISTER (FOR) BITS
Read/Write Address: Reset Value: 15
OF32
03H for FOR0 register, 04H for FOR1 register. 0000H for all FOR registers. 12
DLE3
14
OF31
13
OF30
11
OF22
10
OF21
9
OF20
8
DLE2
7
OF12
6
OF11
5
OF10
4
DLE1
3
OF02
2
OF01
1
OF00
0
DLE0
15
OF72
14
OF71
13
OF70
12
DLE7
11
OF62
10
OF61
9
OF60
8
FOR0 Register 7 6
OF52 OF51
5
OF50
4
DLE5
3
OF42
2
OF41
1
OF40
0
DLE4
DLE6
FOR1 Register Name(1) OFn2, OFn1, OFn0 (Offset Bits 2, 1 & 0) DLEn (Data Latch Edge) Description These three bits define how long the serial interface receiver takes to recognize and store bit 0 from the RX input pin: i.e., to start a new frame. The input frame offset can be selected to +4.5 clock periods from the point where the external frame pulse input signal is applied to the F0i input of the device. See Figure 5. ST-BUS(R) mode: GCI mode:
NOTE: 1. n denotes an input stream number from 0 to 7.
DLEn = 0, if clock rising edge is at the 3/4 point of the bit cell. DLEn = 1, if when clock falling edge is at the 3/4 of the bit cell. DLEn = 0, if clock falling edge is at the 3/4 point of the bit cell. DLEn = 1, if when clock rising edge is at the 3/4 of the bit cell.
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IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
TABLE 9 -- OFFSET BITS (OFn2, OFn1, OFn0, DLEn) & FRAME DELAY BITS (FD11, FD2-0)
Input Stream Offset No clock period shift (Default) + 0.5 clock period shift + 1.0 clock period shift + 1.5 clock period shift + 2.0 clock period shift + 2.5 clock period shift + 3.0 clock period shift + 3.5 clock period shift + 4.0 clock period shift + 4.5 clock period shift FD11 1 0 1 0 1 0 1 0 1 0 Measurement Result from Frame Delay Bits FD2 0 0 0 0 0 0 0 0 1 1 FD1 0 0 0 0 1 1 1 1 0 0 FD0 0 0 1 1 0 0 1 1 0 0 OFn2 0 0 0 0 0 0 0 0 1 1 Corresponding Offset Bits OFn1 0 0 0 0 1 1 1 1 0 0 OFn0 0 0 1 1 0 0 1 1 0 0 DLEn 0 1 0 1 0 1 0 1 0 1
ST-BUS F0i
CLK
RX Stream
Bit 7
offset = 0,
DLE = 0
RX Stream
Bit 7
offset = 1,
DLE = 0
RX Stream
Bit 7
offset = 0,
DLE = 1
RX Stream
Bit 7
offset = 1, DLE = 1
denotes the 3/4 point of the bit cell
GCI F0i
CLK
RX Stream
Bit 0
offset = 0,
DLE = 0
RX Stream
Bit 0
offset = 1,
DLE = 0
RX Stream
Bit 0
offset = 0,
DLE = 1
RX Stream
Bit 0
offset = 1, DLE = 1
denotes the 3/4 point of the bit cell
5717 drw05
Figure 5. Examples for Input Offset Delay Timing 11
IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
TABLE 10 -- CONNECTION MEMORY BITS
15
LPBK
14
V/C
13
PC
12
CCO
11
OE
10
0
9
SAB2
8
SAB1
7
SAB0
6
0
5
0
4
CAB4
3
CAB3
2
CAB2
1
CAB1
0
CAB0
Bit 15 14
13
Name LPBK (Per Channel Loopback) V/C (Variable/Constant Throughput Delay) PC (Processor Channel) CCO (Control Channel Output) OE (Output Enable) Unused SAB2-0 (Source Stream Address Bits) Unused CAB4-0 (Source Channel Address Bits)
Description When 1, the RX n channel m data comes from the TX n channel m. For proper per channel loopback operations, set the delay offset register bits OFn[2:0] to zero for the streams which are in the loopback mode. This bit is used to select between the variable (LOW) and constant delay (HIGH) mode on a per-channel basis. When 1, the contents of the connection memory are output on the corresponding output channel and stream. Only the lower byte (bit 7 - bit 0) will be output to the TX output pins. When 0, the contents of the connection memory are the data memory address of the switched input channel and stream. This bit is output on the CCO pin one channel early. The CCO bit for stream 0 is output first. This bit enables the TX output drivers on a per-channel basis. When 1, the output driver functions normally. When 0, the output driver is in a high-impedance state. Must be zero for normal operation. The binary value is the number of the data stream for the source of the connection. Must be zero for normal operation. The binary value is the number of the channel for the source of the connection.
12 11 10 9,8,7(1) 6,5(1) 4-0(1)
NOTE: 1. If bit 13 (PC) of the corresponding connection memory location is 1 (device in processor mode), then these entire 8 bits (SAB0, bits 6-5, CAB4 - CAB0) are output on the output channel and stream associated with this location.
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IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VCC Vi IO TS PD Parameter Supply Voltage Voltage on Digital Inputs Current at Digital Outputs Storage Temperature Package Power Dissapation -65 Min. -0.3 GND -0.3 Max. 5.0 5.5 20 +125 1 Unit V V mA C W
RECOMMENDED DC OPERATING CONDITIONS
Symbol VCC VIH VIL TOP Parameter Positive Supply Input HIGH Voltage Input LOW Voltage Operating Temperature Commercial Min. 3.0 2.0 GND -40 Typ. Max. 3.6 Vcc 0.8 +85 Units V V V C
NOTE: 1. Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
NOTE: 1. Voltages are with respect to ground unless other wise stated.
DC ELECTRICAL CHARACTERISTICS
Symbol ICC
(1)
Characteristics Supply Current Input Leakage (input pins) Input Leakage (I/O pins) Input Pin Capacitance High-impedance Leakage Output HIGH Voltage Output LOW Voltage Output Pin Capacitance @ 2.048 Mb/s
Min. 2.4
Typ. 7
Max. 10 15 50 10 5 0.4 10
Units mA A A pF A V V pF
IIL IBL CI IOZ VOH VOL CO
NOTE: 1. Outputs Unloaded.
Test Point
VCC
S1 is open circuit except when testing output levels or high impedance states. S2 is switched to VCC or GND when testing output levels or high impedance states.
Output Pin S1 CL GND
RL S2 GND
5717 drw06
Figure 6. Output Load 13
IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
AC ELECTRICAL CHARACTERISTICS - FRAME PULSE AND CLK
Symbol tFPW tFPS tFPH tCP tCH tCL tr, tf Characteristics Frame Pulse Width (ST-BUS , GCI) Bit rate = 2.048 Mb/s
(R)
Min. 26 5 10 190 85 85
Typ.
Max. 295 300 150 150 10
Units ns ns ns ns ns ns ns
Frame Pulse Setup time before CLK falling (ST-BUS(R) or GCI) Frame Pulse Hold Time from CLK falling (ST-BUS or GCI) CLK Period CLK Pulse Width HIGH CLK Pulse Width LOW Clock Rise/Fall Time Bit rate = 2.048 Mb/s Bit rate = 2.048 Mb/s Bit rate = 2.048 Mb/s
(R)
AC ELECTRICAL CHARACTERISTICS - SERIAL STREAMS (1)
Symbol tSIS tSIH tSOD tDZ tZD tODE tXCD Characteristics RX Setup Time RX Hold Time TX Delay - Active to Active TX Delay - Active to High-Z TX Delay - High-Z to Active Output Driver Enable (ODE) Delay CCO Output Delay Min. 0 10 Typ. Max. 30 40 32 32 32 30 40 Unit ns ns ns ns ns ns ns ns ns CL = 30pF CL = 200pF RL = 1K, CL = 200pF RL = 1K, CL = 200pF RL = 1K, CL = 200pF CL = 30pF CL = 200pF Test Conditions
NOTE: 1. High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL.
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IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
tFPW
F0i
tFPS
CLK
tFPH
tCP
tCH
tCL
tr
tf
tSOD
TX Bit 0, Last Ch (1) Bit 7, Channel 0 Bit 6, Channel 0 Bit 5, Channel 0
tSIS
RX Bit 0, Last Ch(1)
tSIH
Bit 6, Channel 0 Bit 5, Channel 0
5717 drw07
Bit 7, Channel 0
NOTE: 1. last channel = ch 31.
Figure 7. ST-BUS(R) Timing
tFPW
F0i
tFPS
CLK
tFPH
tCP
tCH
tCL
tr
tf
tSOD
TX Bit 7, Last Ch(1) Bit 0, Channel 0 Bit 1, Channel 0 Bit 2, Channel 0
tSIS
RX Bit 7, Last Ch(1)
tSIH
Bit 0, Channel 0 Bit 1, Channel 0 Bit 2, Channel 0
5717 drw08
NOTE: 1. last channel = ch 31.
Figure 8. GCI Timing
CLK
(ST-BUS or WFPS mode)
CLK
(GCI mode)
tDZ TX
VALID DATA
ODE
tZD
tODE
VALID DATA
tODE
VALID DATA
5717 drw10
TX tXCD CCO
TX
5717 drw09
Figure 9. Serial Output and External Control 15
Figure 10. Output Driver Enable (ODE)
IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
AC ELECTRICAL CHARACTERISTICS - MULTIPLEXED BUS TIMING (INTEL)
Symbol tALW tADS tADH tALRD tDDR tCSRW tRW tCSR tDHR tWW tALWR tCSW tDSW tSWD tDHW tAKD
(1)
Parameter ALE Pulse Width Address Setup from ALE falling Address Hold from ALE falling RD Active after ALE falling Data Setup from DTA LOW on Read CS Hold after RD/WR RD Pulse Width (Fast Read) CS Setup from RD Data Hold after RD WR Pulse Width (Fast Write) WR Delay after ALE falling CS Setup from WR Data Setup from WR (Fast Write) Valid Data Delay on Write (Slow Write) Data Hold after WR Inactive Acknowledgment Delay: Reading/Writing Registers Reading/Writing Memory
Min. 20 3 3 3 5 5 45 0 10 45 3 0 20
Typ.
Max.
Units ns ns ns ns ns ns ns ns
Test Conditions
CL = 150pF
20
ns ns ns ns ns
CL = 150pF, RL = 1K
122 5 43/43 760/750 22
ns ns ns ns ns CL = 150pF CL = 150pF CL = 150pF, RL = 1K
tAKH (1)
Acknowledgment Hold Time
NOTE: 1. High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL.
tALW
ALE
tADS tADH
AD0-AD7 D8-D15
ADDRESS DATA
tALRD
CS
tCSRW
tCSR
RD
tRW
tDHR
tCSW
WR
tWW tDSW
tDHW
tALWR
DTA
tSWD tAKD
tDDR
tAKH
5717 drw11
Figure 11. Multiplexed Bus Timing (Intel Mode) 16
IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
AC ELECTRICAL CHARACTERISTICS - MULTIPLEXED BUS TIMING (MOTOROLA)
Symbol tASW tADS tADH tDDR tCSH tCSS tDHW tDWS tSWD tRWS tRWH tDHR(1) tDSH tAKD Parameter ALE Pulse Width Address Setup from AS falling Address Hold from AS falling Data Setup from DTA LOW on Read CS Hold after DS falling CS Setup from DS rising Data Hold after Write Data Setup from DS - Write (Fast Write) Valid Data Delay on Write (Slow Write) R/W Setup from DS Rising R/W Hold from DS Rising Data Hold after Read DS Delay after AS falling Acknowledgment Delay: Reading/Writing Registers Reading/Writing Memory tAKH(1) Acknowledgment Hold Time 43/43 760/750 22 ns ns ns CL = 150pF CL = 150pF CL = 150pF, RL = 1K 60 5 10 10 20 Min. 20 3 3 5 0 0 5 20 122 Typ. Max. Units ns ns ns ns ns ns ns ns ns ns ns ns ns CL = 150pF, RL = 1K CL = 150pF Test Conditions
NOTE: 1. High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL.
DS
tRWS
R/W
tRWH
tASW
AS
tDSH
tADS
AD0-AD7 D8-D15 WR AD0-AD7 D8-D15 RD CS ADDRESS
tADH
tSWD
tDHW tDWS
DATA
tDHR
ADDRESS DATA
tCSH tCSS tDDR
DTA
tAKD
tAKH
5717 drw12
Figure 12. Multiplexed Bus Timing (Motorola Mode) 17
IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
AC ELECTRICAL CHARACTERISTICS-MOTOROLA NON-MULTIPLEXED BUS MODE
Symbol tCSS tRWS tADS tCSH tRWH tADH tDDR tDHR tDSW tSWD tDHW tAKD Parameter CS Setup from DS falling R/W Setup from DS falling Address Setup from DS falling CS Hold after DS rising R/W Hold after DS Rising Address Hold after DS Rising Data Setup from DTA LOW on Read Data Hold on Read Data Setup on Write (Fast Write) Valid Data Delay on Write (Slow Write) Data Hold on Write Acknowledgment Delay: Reading/Writing Registers Reading/Writing Memory tAKH(1) Acknowledgment Hold Time 43/43 760/750 22 ns ns ns CL = 150pF CL = 150pF CL = 150pF, RL = 1K 5 Min. 0 10 2 0 2 2 2 10 5 122 20 Typ. Max. Units ns ns ns ns ns ns ns ns ns ns ns CL = 150pF CL = 150pF, RL = 1K Test Conditions
NOTE: 1. High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL.
DS
tCSS
CS
tCSH
tCSS
tCSH
tRWS
R/W
tRWH
tRWS
tRWH
tADS
A0-A7 VALID WRITE ADDRESS
tADH
tADS
VALID READ ADDRESS
tADH
tDSW
AD0-AD7/ D8-D15
tDHW tDDR
tDHR
VALID READ DATA
VALID WRITE DATA
tAKD
DTA
tAKH
tAKD
tAKH
5717 drw13
Figure 13. Motorola Non-Multiplexed Asyncronous Bus Timing 18
IDT72V70190 3.3V TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
COMMERCIAL TEMPERATURE RANGE
CLK GCI CLK ST-BUS
tDSS
DS
tDSS tDSPW tCSH tCSS tCSH
tCSS
CS
tRWS
R/W
tRWH
tRWS
tRWH
tADS
A0-A7
tADH
VALID WRITE ADDRESS
tADS
tADH
VALID READ ADDRESS
tSWD
AD0-AD7/ D8-D15
tDHW
VALID WRITE DATA
tDHR
VALID READ DATA
tCKAK
DTA
tDDR tAKH tCKAK tAKH
5717 drw14
Figure 14. Motorola Non-Multiplexed Syncronous Bus Timing
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ORDERING INFORMATION
IDT XXXXXX Device Type XX Package X Process/ Temperature Range BLANK Commercial (-40C to +85C)
PF TF
Thin Plastic Quad Flatpack (TQFP, PN64-1) Small Thin Quad Flat Pack (STQFP, PP64-1)
72V70190
256 x 256 3.3V Time Slot Interchange Digital Switch
5717 drw15
DATASHEET DOCUMENT HISTORY
5/02/2000 1/03/2001 1/25/2001 08/06/2001 03/24/2003 pg.1 pgs. 4, 5, 9, 10, 13, 15, 16, 17, 18 and 19. pgs. 13 and 18. pg. 1 pg 1. CORPORATE HEADQUARTER 2975 Stender Way Santa Clara, CA 95054 for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com
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for Tech Support: 408-330-1753 email: TELECOMhelp@idt.com

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