Programmable depth first-in, first-out memory

Details Programmable depth first-in, first-out memory Programmable depth first-in, first-out memory

1988-01-21

1992-03-17

Bowler, Alyssa H.

Static information storage and retrieval

Plural shift register memory devices

G11C 700, G11C 1900

Patent

active

050974424

ABSTRACT:
A first-in, first-out memory (10) can store a programmable number of data words at respective address locations within a memory (76). A read address generator (50, 58) generates a read pointer for pointing to a read address location in the memory (76). A depth address generator (42) points to a depth address location in the memory that is displaced from the read address location by a predetermined number of address locations. This depth address generator (42) is incremented to a next read depth address responsive to a read pulse (20) issued from a read/write controller (12). A write address generator (80) points to a write address location within memory (76). A comparator (52) compares the value stored in the write address generator (42) to the read depth address location stored in depth address generator (42) and is operable to generate a FULL memory status flag (24) responsive to their equality. Preferably, the comparator (52) also compares the read address to the write address, and is operable to generate an EMPTY status flag (26) responsive to their equality.

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FIFO RAM Controller Tackles Deep Data Buffering, by Tom Pai Computer Design Aug. 1, 1986 pp. 109-112.

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