Static information storage and retrieval – Read/write circuit – Including signal comparison
Patent
1986-07-24
1989-05-23
Hecker, Stuart M.
Static information storage and retrieval
Read/write circuit
Including signal comparison
365221, 36523005, G11C 700, G11C 800
Patent
active
048336513
ABSTRACT:
A No-Fall-Through, FIFO memory includes a memory section comprising a plurality of locations for storing data words. Data words are written into the storage locations in response to a write clock input signal. Data words are read from the storage locations, in the same sequence as previously written, in response to a read clock signal. A write pointer maintains a write pointer value indicative of the number of data words which have been written. A read pointer maintains a read pointer value indicative of the number of data words which have been read. A comparator monitors the write pointer and read pointer values and detects differences between the two. The characteristics of the differences are utilized to control internal operations of the FIFO.
REFERENCES:
patent: 4151609 (1979-04-01), Moss
patent: 4419796 (1983-12-01), Hunter et al.
patent: 4507760 (1985-03-01), Fraser
patent: 4694426 (1987-09-01), Mason
patent: 4714994 (1987-12-01), Oklobdzija et al.
United Technologies Mostek Preliminary Data Sheet, "512.times.9 BiPort.TM. Parallel In-Out FIFO MK4501/MK68345 N-12, 15, 20", printed Jul., 1983.
Hanjani Hassan M.
Seltzer Jeffrey H.
Gossage Glenn A.
Hecker Stuart M.
National Semiconductor Corporation
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