System for writing a plurality of data bits less than from the t

Details System for writing a plurality of data bits less than from the t System for writing a plurality of data bits less than from the t

1997-04-17

1999-11-30

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

395110, 395115, G06F 1314

Patent

active

059960329

ABSTRACT:
Register write circuitry (250) writes to a plurality of data register bits (276) using a single register write operation by storing both designated address bits (276) and an address field (274) for addressing a predetermined data register. The designation address bits (276) designate predetermined bits (A.sub.4,A.sub.2,A.sub.2,A.sub.1) within data register (76) to which data was to be written. Writing data (274) only to predetermined bits (276) in a register write operation uses a single write enable command (272) in a programmable and selectable manner without performing a read-modify-write or requiring the storage of a bit image of the register.

REFERENCES:
patent: 3926087 (1975-12-01), Griffis
patent: 4369440 (1983-01-01), Piguet et al.
patent: 5195176 (1993-03-01), Lung
patent: 5276826 (1994-01-01), Rau et al.

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