RAM based FIFO memory half-full detection apparatus and method

Details RAM based FIFO memory half-full detection apparatus and method RAM based FIFO memory half-full detection apparatus and method

1992-02-24

1996-02-06

Whitfield, Michael A.

Static information storage and retrieval

Magnetic bubbles

Guide structure

36518904, 365221, 365236, 364DIG1, G06F 1200, G11C 800

Patent

active

054902576

ABSTRACT:
A method for detecting a half-full condition of a first-in, first-out memory array. The method of the invention includes the steps of a) moving a write pointer through the array to write data to alternating rows of the memory array; b) moving a read pointer through the array to read data from the alternating rows of the memory array in first-in, first-out order; and c) providing a half-full indication when the read pointer and the write pointer point to adjacent rows in the memory array. This method eliminates the need to route lines across the array to detect a half-full condition, thereby reducing die and power requirements and offering an increase in speed.

REFERENCES:
patent: 3851313 (1974-11-01), Chang
patent: 4486854 (1984-12-01), Yuni
patent: 4864543 (1989-09-01), Ward et al.
patent: 4875196 (1989-10-01), Spaderna et al.
patent: 4888739 (1989-12-01), Frederick et al.
patent: 4954987 (1990-09-01), Auvinen et al.
patent: 5084841 (1992-01-01), Williams et al.

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