Method of identifying flag bits

Details Method of identifying flag bits Method of identifying flag bits

1988-01-27

1990-02-20

Gruber, Felix D.

Boots, shoes, and leggings

364580, 364300, 371 291, 371 511, G06F 1100, G06F 1130, G06F 1574

Patent

active

049032194

ABSTRACT:
A technique for determining and resetting one or more flags in a digital word in memory in which the flags comprise added bits in known locations different from any of the magnitude bits in the word. A sign bit is included and a flag is set by making its bit value differ from that of the sign bit. A digital word from the memory is AND'd with a bit mask to check the flag bit location. A parity routine is run to determine whether the flag bit is set, and if so, the memory location of the word and the type of flag is recorded. The word with the flag bit set is XOR'd with another bit mask to reset the flag bit so that the word may be returned to its memory location with the flag reset.

REFERENCES:
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patent: 4379332 (1983-04-01), Busser et al.
patent: 4393498 (1983-07-01), Jackson et al.
patent: 4394742 (1983-07-01), Crummer et al.
patent: 4463729 (1984-08-01), Bullis et al.
patent: 4551803 (1985-11-01), Hosaka et al.
patent: 4562728 (1986-01-01), Timmerman
patent: 4751633 (1988-06-01), Henn et al.
patent: 4752899 (1988-06-01), Newman et al.

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