Instruction decoding in data processing apparatus

Details Instruction decoding in data processing apparatus Instruction decoding in data processing apparatus

1981-01-16

1983-12-06

Smith, Jerry

Boots, shoes, and leggings

G06F 936, G06F 942

Patent

active

044197268

ABSTRACT:
An instruction decoding system for data processing apparatus in which alternative instruction interpretations are made possible through hardware sensing of the operational state of one or more machine elements. In one embodiment, a zero detect unit is used to sense the state of a subroutine stack used in a microprogrammed system, therefore permitting a generic "exit" microcommand to be interpreted either as a "return" or a "decode" depending upon the state of the subroutine stack.

REFERENCES:
patent: 3533076 (1970-10-01), Perkins et al.
patent: 3636523 (1972-01-01), De Sandre et al.
patent: 4074355 (1978-02-01), Tubbs
patent: 4224668 (1980-09-01), Peters et al.
patent: 4338661 (1982-07-01), Tredennick et al.
patent: 4338663 (1982-07-01), Strecker et al.

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