Microcomputer with self-test of macrocode

Details Microcomputer with self-test of macrocode Microcomputer with self-test of macrocode

1981-06-22

1989-01-10

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 900

Patent

active

047978082

ABSTRACT:
A microcomputer device contains a CPU with an arithmetic/logic unit and data/address registers on a single semiconductor integrated circuit having on-chip macrocode and microcode storage. A macrocode word is fetched from an on-chip ROM and stored in an instruction register in the CPU, then a sequence of microcode words is fetched from the microcode store based on this macrocode word. A check-code based on some function of all macrocode bits is stored in on-chip ROM upon manufacture. To test a device after fabrication is complete, a test program (resident in ROM or downloaded into on-chip RAM) is executed to address all bytes of macrocode and perform some cummulative function on it via the ALU to see if the same check-code is produced. If so, an output indicates a good unit.

REFERENCES:
patent: 3959636 (1976-05-01), Johnson et al.
patent: 4128873 (1978-12-01), Lamiaux
patent: 4141068 (1979-02-01), Mager et al.
patent: 4153933 (1979-05-01), Blume et al.
patent: 4191996 (1980-03-01), Chesley

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