Static information storage and retrieval – Associative memories – Ferroelectric cell
Patent
1989-07-11
1990-01-02
Fears, Terrell W.
Static information storage and retrieval
Associative memories
Ferroelectric cell
36518901, 36523005, 365221, 36523008, G11C 1500
Patent
active
048917885
ABSTRACT:
An almost full flag for a FIFO includes first and second counters for determining the proximity of the Read and Write pointers in the FIFO. A compare circuit is provided for comparing the output of the counters to determine when the count values are separated by a predetermined value. When the separation is equal to the predetermined value, the output of the comparitor goes low. A half flag is set when a Write operation occurs and the difference value between the Read and Write pointers increases. The set operation is performed in response to the presence of the compare signal at a low logic state at the time that the Write operation occurs, thus eliminating any delays in generating a transition in the compare circuit. The flag is reset when the compare signal is at the low logic state. Blanking circuitry is provided for blanking the reset operation when a Read operation occurs and the output of the comparator makes a transition from the first logic state to the second logic state. The blanking operation occurs for a predetermined duration of time to allow the counter to settle before performing the reset operation.
REFERENCES:
patent: 3704452 (1972-11-01), Beausoleil et al.
patent: 3708690 (1973-01-01), Paivnen
patent: 4803657 (1989-02-01), Giebel et al.
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