Apparatus for buffer control bypass

Details Apparatus for buffer control bypass Apparatus for buffer control bypass

1983-08-30

1988-05-03

Chan, Eddie P.

Boots, shoes, and leggings

G06F 1300

Patent

active

047424540

ABSTRACT:
Access control to a high speed data buffer in a data processing machine is bypassed in order to enhance the speed of access of data which must be retrieved from a large capacity main storage facility without requiring additional circuitry in the data processing machine. Access control normally requires an entire line of data to be present in a cache before allowing a read to a portion of the line. When lines are moved in to the cache, only sub-line increments are loaded at a time. Thus, when a line is being moved in from a main store to the cache, the increment that satisfies a pending request for access is transferred first. The access control is overridden to allow access to the increment before the balance of the line is transferred.

REFERENCES:
patent: 3573744 (1971-04-01), Rigazio
patent: 4208716 (1980-06-01), Porter et al.
patent: 4258418 (1981-03-01), Heath
patent: 4527233 (1985-07-01), Ambrosius, IV et al.

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