鈥?/div>
256 x 256 channel non-blocking switch
Serial Telecom Bus Compatible (ST-BUS
廬
)
8 RX inputs鈥?2 channels at 64 Kbit/s per serial line
8 TX output鈥?2 channels at 64 Kbit/s per serial line
Three-state serial outputs
Microprocessor Interface (8-bit data bus)
3.3V Power Supply
Available in 44-pin Plastic Leaded Chip Carrier (PLCC), 48-pin
Small Shrink Outline Package (SSOP), and 44-pin Plastic Quad
Flatpack (PQFP)
Operating Temperature Range -40擄C to +85擄C
擄
擄
3.3V I/O with 5V Tolerant Inputs
and output channels. Those 256 channels are divided into 8 serial inputs and
outputs, each of which consists of 32 channels (64 Kbit/s per channel) to form
a multiplexed 2.048 Mb/s stream.
FUNCTIONAL DESCRIPTION
A functional block diagram of the IDT72V8980 device is shown on below.
The serial ST-BUS
廬
streams operate continuously at 2.048 Mb/s and are
arranged in 125碌s wide frames each containing 32, 8-bit channels. Eight input
(RX0-7) and eight output (TX0-7) serial streams are provided in the
IDT72V8980 device allowing a complete 256 x 256 channel non-blocking
switch matrix to be constructed. The serial interface clock (C4i) for the device
is 4.096 MHz.
The received serial data is internally converted to a parallel format by the
on chip serial-to-parallel converters and stored sequentially in a 256-position
Data Memory. By using an internal counter that is reset by the input 8 KHz frame
pulse,
F0i,
the incoming serial data streams can be framed and sequentially
addressed.
DESCRIPTION:
The IDT72V8980 is a ST-BUS
廬
compatible digital switch controlled by a
microprocessor. The IDT72V8980 can handle as many as 256, 64 Kbit/s input
FUNCTIONAL BLOCK DIAGRAM
C4i
F0i
V
CC
GND
RESET
(1)
ODE
RX0
RX1
RX2
RX3
RX4
RX5
RX6
RX7
Timing
Unit
TX0
Output MUX
Transmit
Serial Data
Streams
TX1
TX2
Receive
Serial Data
Streams
Data
Memory
Control Register
Connection
Memory
TX3
TX4
TX5
TX6
TX7
Microprocessor Interface
5705 drw01
DS
CS
R/W A0
DTA
D0/
A5/
D5
CCO
NOTE:
1. The
RESET
Input is only provided on the SSOP package.
IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The ST-BUS
錚?/div>
is a trademark of Mitel Corp.
AUGUST 2003
DSC-5705/5
1
錚?/div>
2003 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
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