Digital processor using current state comparison for providing f

Details Digital processor using current state comparison for providing f Digital processor using current state comparison for providing f

1989-08-03

1992-08-11

Lee, Thomas C.

Boots, shoes, and leggings

3642217, 3642283, 364229, 364230, 3642303, 3642305, 364265, 3642664, 3642665, 3642666, 3642675, 3642676, 3642681, 3642678, 3642689, 3642694, 3642318, 364DIG1, G06F 930, G06F 938, G06F 1108, G06F 1134

Patent

active

051387085

ABSTRACT:
A highly fault-tolerant processor is comprised of first and second central processing units (CPU) executing the same instruction sequence. Each CPU provides a state vector representing the current state thereof. The current state of each CPU is defined by the contents of a set of appropriate registers of the CPU after the CPU has completed execution of an instruction. The bits comprising the state vectors are compared by EXCLUSIVE OR gates, the outputs of which being ORed to provide a fail flag indicative of whether or not the state vectors agree with respect to each other. The state previous to the current state is stored external to the CPUs in a state image storage. The external image of the previous state is stored by pushing the existing contents of each of the registers in the set from one of the CPUs into the external image storage prior to the contents of the register being changed pursuant to the execution of the current instruction.

REFERENCES:
patent: 4805107 (1989-02-01), Kieckhafer et al.
patent: 4816989 (1989-03-01), Finn et al.
patent: 4972363 (1990-11-01), Nguyen et al.
patent: 4980857 (1990-12-01), Walter et al.

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