Microcomputer with bus interchange module

Details Microcomputer with bus interchange module Microcomputer with bus interchange module

1984-06-15

1985-03-05

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 300

Patent

active

045035008

ABSTRACT:
A system for real-time digital signal processing employs a single-chip microcomputer device having separate on-chip program ROM and data RAM, with separate address and data paths for program and data. An external program address bus allows off-chip program fetch in an expansion mode, with the opcode returned by an external data bus. A bus interchange module allows transfer between the separate internal program and data busses in special circumstances. The internal busses are 16-bit, while the ALU and accumulator are 32-bit. A multiplier circuit produces a single state 16.times.16 multiply function separate from the ALU, with 32-bit output to the ALU. One input to the ALU passes through a 0-to-15 bit shifter with sign extension.

REFERENCES:
patent: 4309754 (1982-01-01), Dinwiddie, Jr.
patent: 4339793 (1982-07-01), Marenin
patent: 4348743 (1982-09-01), Dozier
patent: 4378589 (1983-03-01), Finnegan et al.

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