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IMP8980D Datasheet(PDF) 1 Page - A1 PROs co., Ltd. |
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IMP8980D Datasheet(HTML) 1 Page - A1 PROs co., Ltd. |
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1 / 14 page  1 IMP8980D PCM Digital Switch Figure 1 Functional Block Diagram General Description This 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 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. Features ♦ 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 Functional Description The ST-BUS architecture can be used both in software-controlled digital voice and data switching. The ST-Bus serial streams operate continuously at 2048kbit/s and are arranged in 125 µs wide frames which contain 32 8-bit channels. The IMP8980D 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 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 Serial to Parallel Converter Frame Counter Control Register Control Interface Output MUX Connection Memory Parallel to Serial Converter ODE STi0 STi1 STi2 STi3 STi4 STi5 STi6 STi7 STo0 STo1 STo2 STo3 STo4 STo5 STo6 STo7 DS CS R/W A5/ A0 DTA D7/ D0 CSTo C4i F0i VDD VSS Data Memory ISO 9001 Registered ® |
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Similar Description - IMP8980D |
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