Method of internal self-test of microprocessor using microcode

Details Method of internal self-test of microprocessor using microcode Method of internal self-test of microprocessor using microcode

1984-01-03

1987-02-03

Atkinson, Charles E.

Excavating

364200, G06F 1100

Patent

active

046413081

ABSTRACT:
A microprocessor device is used in an adapter for a communications loop of the closed ring, one-way, token-passing local area network type. Each station has a host processor with a host CPU, a main memory, and a system bus, and has an adapter including the microprocessor tested according to the invention. The adapter coupled to the main memory by the system bus and includes a local CPU (the microprocessor), a local read/write memory, and a local bus. A transmit-and-receive controller is coupled to the local bus to directly access the local read/write memory; when this station receives a free token, the transmit-and-receive controller copies the message frame to be transmitted from the local read/write memory to the outgoing signal path, converting from parallel to serial. When a message addressed to this station is received, the controller converts it from serial to parallel, and copies the message frame into the local read/write memory via the local bus. Testing of the microprocessor is accomplished by internal self-test of the registers of the device, using the microcode of the control ROM initiated by a test control input.

REFERENCES:
patent: 4127768 (1978-11-01), Negi et al.
patent: 4347608 (1982-08-01), Appiano et al.
patent: 4402044 (1983-08-01), McDonough et al.
patent: 4517661 (1985-05-01), Graf et al.

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