Microcomputer with self-test of microcode

Details Microcomputer with self-test of microcode Microcomputer with self-test of microcode

1981-07-02

1984-12-25

Gruber, Felix D.

Boots, shoes, and leggings

371 38, G06F 1100, G06F 700

Patent

active

044907834

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 microcode bits, or all macrocode and microcode 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 access all bytes of microcode (or both microcode and 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: 3517171 (1970-06-01), Avizienis
patent: 3959636 (1976-05-01), Johnson et al.
patent: 4128873 (1978-12-01), Lamiaux
patent: 4141068 (1979-02-01), Mager et al.
patent: 4191996 (1980-03-01), Chesley

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