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MT8920B Datasheet St-bus Parallel ACcess Circuit

Manufacturer: Mitel Networks Corporation

Overview: ® ISO-CMOS ST-BUS™ FAMILY MT8920B ST-BUS Parallel Access Circuit ..

General Description

The ST-BUS Parallel Access Circuit (STPA) provides a simple interface between Mitel’s ST-BUS and parallel system environments.

• • • Applications • • • • • Parallel control/data access to T1/CEPT digital trunk interfaces Digital signal processor interface to ST-BUS puter to Digital PABX link Voice store and forward systems Interprocessor munications D7-D0 A4-A0 Tx0 Dual Port Ram 32 X 8 Parallelto-serial Converter STo0 CS DS, OE R/W, WE DTACK, BUSY, DCS IRQ, 24/32 IACK, MS1 A5, STCH MMS Rx0 Dual Port Ram 32 X 8 Parallel Port Interface Interrupt Registers Control Registers Serial-toParallel Converter STi0 Tx1 Dual Port Ram 32 X 8 Parallelto-Serial Converter p/ MUX Address Generator STo1 F0i C4i VSS VDD Figure 1 - Functional Block Diagram 3-3 3 MT8920B CMOS STi0 IACK, MS1 F0i C4i VDD MMS DTACK, BUSY, DCS 4 3 2 1 28 27 26 • 28 PIN PDIP/CERDIP/SOIC Figure 2 - Pin Connections Pin Description Pin # 1 2 Name C4i F0i Description‡ 4.096 MHz Clock.

The ST-BUS timing clock used to establish bit cell boundaries for the serial bus.

Key Features

  • High speed parallel access to the serial ST-BUS Parallel bus optimized for 68000 µP (mode 1) Fast dual-port RAM access (mode 2) Access time: 120 nsec Parallel bus controller (mode 3) - no external controller required Flexible interrupt capabilities - two independent/programmable interrupt sources with auto-vectoring Selectable 24 and 32 channel operation Programmable loop-around modes Low power CMOS technology ISSUE 6 June 1996 Ordering Inform.

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