TIME SLOT INTERCHANGE DIGITAL SWITCH
Description
www.
DataSheet4U.
com
TIME SLOT INTERCHANGE DIGITAL SWITCH 256 x 256
.
EATURES:
• • • • • • • • •
IDT728980
256 x 256 channel non-blocking switch Serial Telecom Bus Compatible (ST-BUS®) 8 RX inputs—32 channels at 64 Kbit/s per serial line 8 TX output—32 channels at 64 Kbit/s per serial line Three-state serial outputs Microprocessor Interface (8-bit data bus) 5V Power Supply Available in 44-pin Plastic Leaded Chip Carrier (PLCC), 40-pin Plastic Dip (P-DIP) and 44-pin Plastic Quad Flatpack (PQFP) Operating Temperature Range -40°C to +85°C
outputs, each of which consists of 32 channels (64 Kbit/s per channel) to form a multiplexed 2.
048 Mb/s stream.
.
UNCTIONAL DESCRIPTION
A functional block diagram of the IDT728980 device is shown on below.
The serial ST-BUS® streams operate continuously at 2.
048 Mb/s and are arranged in 125µs wide frames each containing 32, 8-bit channels.
Eight input (RX0-7) and eight output (TX0-7) serial streams are provided in the IDT728980 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.
Data to be output on the serial streams may come from two sources: Data Memory or Connection Memory.
The Connection Memory is 16 bits wide and
DESCRIPTION:
The IDT728980 is a ST-BUS® compatible digital switch controlled by a microprocessor.
The IDT728980 can handle as many as 256, 64 Kbit/s input and output channels.
Those 256 channels are divided into 8 serial inputs and
.
UNCTIONAL BLOCK DIAGRAM
C4i
F0i
VCC
GND
ODE
RX0 RX1 RX2 RX3 RX4 RX5 RX6 RX7
Timing Unit
TX0
Output MUX Transmit Serial Data Streams
TX1 TX2
Receive Serial Da...
Similar Datasheet
