Semiconductor memory device performing last in-first out operation and the method for controlling the same
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United States of America Patent
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Apr 27, 1993
Issued Date -
N/A
app pub date -
Mar 12, 1992
filing date -
Oct 14, 1989
priority date (Note) -
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Abstract
A LIFO device includes a plurality of memory circuits (1), a write address pointer (2) and a read-out address pointer (3). The write address pointer (2) selects the memory circuit (1) in which data are to be written, while the read-out address pointer (3) selects the memory circuit (1) from which data are to be read out. Each of the write address pointer (2) and the read-out address pointer (3) alternately and repeatedly performs the count-up operation for selecting the memory circuits in a predetermined sequence and the count-down operation of selecting the memory circuits in a sequence which is the reverse of the predetermined sequence. Control is also so made that the selection by the read-out address pointer (3) precedes the selection by the write address pointer (2).
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