Microprocessor architecture for improved chip testability

Details Microprocessor architecture for improved chip testability Microprocessor architecture for improved chip testability

1979-07-30

1983-12-20

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 300, G06F 1100

Patent

active

044221410

ABSTRACT:
An improved architecture for a single chip microprocessor CPU includes provision for directly observing at its terminals the control signals from its instruction decoder to facilitate functional testing of the chip. The CPU, upon receiving a command signal transfers the signals on the control lines of its instruction decoder to its output terminals. In one embodiment of the invention the command signal is applied to the CPU chip at a designated input terminal. In another embodiment, the command signal is applied through a special instruction. The improvements permit increased functional test fault coverage and shorter test programs.

REFERENCES:
patent: 3585599 (1971-07-01), Hitt et al.
patent: 3825901 (1974-07-01), Golnek, Sr. et al.
patent: 4128873 (1978-12-01), Lamiaux
patent: 4130869 (1978-12-01), Kinoshita et al.
patent: 4167780 (1979-09-01), Hayashi

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