ST-BUS Parallel Access Circuit
®
ISO-CMOS ST-BUS™ FAMILY MT8920B ST-BUS Parallel Access Circuit
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Features
• • • • • High speed pa...
Description
®
ISO-CMOS ST-BUS™ FAMILY MT8920B ST-BUS Parallel Access Circuit
www.datasheet4u.com
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 Information MT8920BE 28 Pin Plastic DIP MT8920BC 28 Pin Ceramic DIP MT8920BP 28 Pin Plastic J-Lead MT8920BS 28 Pin SOIC -40°C to 85°C
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 Computer to Digital PABX link Voice store and forward systems Interprocessor communications
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 Comp/ MUX Address Generator
STo1
F0i C4i
VSS
VDD
Figure 1 - Functional Block Diagram
3-3 3
MT8920B
CMOS
STi0 IACK...
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