Multiport cache memory control unit including a tag memory havin

Details Multiport cache memory control unit including a tag memory havin Multiport cache memory control unit including a tag memory havin

1991-01-25

1993-07-13

Gossage, Glenn

Static information storage and retrieval

Magnetic bubbles

Guide structure

36523005, 364DIG1, 36424341, 3642448, 3649659, G06F 1200, G06F 1300, G11C 1500

Patent

active

052281353

ABSTRACT:
A multiport cache memory control unit includes a central processing unit having N arithmetic units for executing arithmetic processing, a tag memory having N address ports for storing addresses, a multiport cache memory having N data ports for storing pieces of data at addresses which agree with the addresses stored in the tag memory, and a snoop address port through which a snoop operation is executed to detect an address signal. Arithmetic processing is executed in each of the arithmetic units by reading a piece of data from the cache memory after providing an address signal to the tag memory to check whether or not the data is stored in the cache memory. In cases where a cache miss occurs, a piece of data stored in a main memory unit is fetched through the snoop address port without halting the arithmetic processing. In cases where a snoop hit occurs, an address signal provided from another control unit is transmitted to the tag memory through the snoop address port without halting the arithmetic processing.

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