imp8980d A1 PROs co., Ltd., imp8980d Datasheet

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imp8980d

Manufacturer Part Number
imp8980d
Description
Pcm Digital Switch
Manufacturer
A1 PROs co., Ltd.
Datasheet
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 256 64kbit/s channels. Each of the eight
serial inputs and outputs consist of 32
64kbit/s channels multiplexed to form a
2048kbit/s ST-BUS stream. In addition,
the IMP8980D provides microprocessor
read and write access to individual
ST-BUS (Serial Telecom Bus) channels.
Figure 1 Functional Block Diagram
General Description
Features
STi0
STi1
STi2
STi3
STi4
STi5
STi6
STi7
This CMOS device is designed for
ST-BUS compatible
8-line x 32-channel inputs
8-line x 32-channel outputs
256 ports non-blocking switch
Single power supply (+5V)
30mW power consumption
Microprocessor-control interface
Pin-compatible with Mitel MT8980
Converter
Parallel
Serial
to
Memory
Data
C4i
Counter
Frame
DS
F0i
CS
Control Interface
Control Register
R/W
PCM Digital Switch
A5/
A0
V
DD
DTA
both in software-controlled digital voice
and data switching.
continuously at 2048kbit/s and are
arranged in 125µs wide frames which
contain 32 8-bit channels.
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
IMP8980D looks like a memory periph-
eral. The microprocessor can write to the
IMP8980D to establish switched connec-
tions between input ST-BUS channels and
output ST-BUS channels or to transmit
messages on output ST-BUS channels. By
reading from the IMP8980D, the micro-
processor can receive messages from
ST-BUS input channels or check which
Functional Description
V
SS
The ST-BUS architecture can be used
The ST-Bus serial streams operate
The IMP8980D can switch data from
D7/
D0
Connection
Memory
Output
CSTo
MUX
IMP8980D
Converter
Parallel
ODE
Serial
to
ISO 9001 Registered
STo0
STo1
STo2
STo3
STo4
STo5
STo6
STo7
®
1

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imp8980d Summary of contents

Page 1

... The microprocessor can write to the IMP8980D to establish switched connec- tions between input ST-BUS channels and output ST-BUS channels or to transmit messages on output ST-BUS channels. By reading from the IMP8980D, the micro- processor can receive messages from ST-BUS input channels or check which C4i V ...

Page 2

... 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 IMP8980D constructed. It also controls the CSTo pin. All ST-BUS timing is derived from the C4i and F0i signals. Software Control ...

Page 3

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 ...

Page 4

... ST-BUS output is monitored by a microprocessor (not shown) through an ST-BUS input on the bottom IMP8980D. Figure 8 shows how a simple digital switching system may be designed using the ST-BUS architecture. This is a private telephone network with 256 extensions which uses a single IMP8980D as a speech 0 IMP8980D DS-5-00 ...

Page 5

... IMP8980D for communication with the line interface circuits. A larger digital switching system may be designed by cascading a number of IMP8980Ds. Figure 9 shows four IMP8980Ds 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. ...

Page 6

... Line Interface Circuit with Codec (e.g. 8964) 8980 #1 STi0/7 STo0/7 8980 #2 STi0/7 STo0/7 8980 #3 STi0/7 STo0/7 8980 #4 STi0/7 STo0/7 MT9964 Line Divider Filter/Codec and Wire Signalling Converter Logic Line Repeated for Lines 2 to 255 Line 256 OUT 0/7 OUT 8/15 IMP8980D DS-5-00 ...

Page 7

Figure 10 Application Circuit D7-D0 A15-A0 MEK6802D3 R/W System MR VMA E 1 DTA 2 STi0 3 STi1 4 STi2 909Ω 5 STi3 1/4W 6 STi4 7 STi5 5V 8 STi6 IMP 9 STi7 5V 10 VDD 8980 11 F0i ...

Page 8

... Sourcing. V =2. Sinking 0.4V OL µA V between V and open circuit except when testing output levels or high impedance states switched to VDD or VSS when testing output levels or high impedance states. IMP8980D DS-5- ...

Page 9

AC Electrical Characteristics † - Clock Timing (Figures 12 and 13) Characteristics 1 Clock Period* 2 Clock Width High 3 Clock Width Low 4 Clock Transition Time 5 Frame Pulse Setup TIme 6 Frame Pulse Hold Time 7 Frame Pulse ...

Page 10

... STo0 to 0.8V STo7 t XCD Units Test Conditions KΩ*, C =150 =150 =150 =150 KΩ*, C =150 =150 =150 OED OED Bit Cell Boundaries t SIH t SIS IMP8980D DS-5- ...

Page 11

AC Electrical Characteristics † - Processor Bus (Figures 11 and 17) Characteristics 1 Chip Select Setup Time 2 Read/Write Setup Time 3 Address Setup Time 4 A cknowledgement Fast Delay Slow 5 Fast Write Data Setup Time 6 Slow Write ...

Page 12

... NB: Even when ODE is high, channels on the STo0-STo7 outputs can go high impedance under software control. CSTo Control ST-BUS Output (Complementary Output). Each frame of 256 bits on this ST-BUS output contains the values of bit 1 in the 256 locations of the Connection Memory High Connection. IMP8980D DS-5-00 ...

Page 13

... Figure 2 Pin Connections STi3 STi4 STi5 STi6 STi7 VDD F0i C4i Ordering Information Ordering Part Number IMP8980DC IMP8980DE IMP8980DP IMP8980DP Pin PLCC DTA 1 40 CSTo STi0 2 39 ODE STi1 3 38 STo0 STi2 4 37 STo1 ...

Page 14

... ISO 9001 Registered IMP, Inc. http://www.impweb.com 14 © IMP, Inc. IMP8980D DS-5-00 ...

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