Extended control word decoding

Details Extended control word decoding Extended control word decoding

1982-03-18

1984-12-11

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 930

Patent

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044882190

ABSTRACT:
Extended control word decode circuitry increases the number of simultaneous functions performed during execution of a control word in the central processing unit (CPU) of a computer system. A first field of a control word is decoded into 2.sup.n decodes for testing or specifying a first set of CPU conditions. A second field in the control word is decoded into 2.sup.m -X decodes for testing or specifying a second set of CPU conditions. The X decodes, which together with the 2.sup.n decodes of the first field test or specify multiples or pairs of a third set of CPU conditions and inhibit the 2.sup.n decodes from testing or specifying said first set of CPU conditions.

REFERENCES:
patent: 3792441 (1974-02-01), Wymore
patent: 4042972 (1977-08-01), Gruner
patent: 4117536 (1978-09-01), Bodner
patent: 4266272 (1981-05-01), Berglund
patent: 4293907 (1981-10-01), Huang
IRE Transactions on Electronic Computers-A Method of Increasing the Number of Orders in a Digital Computer., Jun. 1962, p. 416.
IBM Technical Disclosure Bulletin-"Saving Bits in a Control Store Word by Redefining Branch Fields", Jan. 1982, vol. 24, No. 8.

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