Static information storage and retrieval – Read/write circuit – Parallel read/write
Patent
1993-09-01
1995-06-20
Popek, Joseph A.
Static information storage and retrieval
Read/write circuit
Parallel read/write
365221, 365236, 36518907, 36523005, G11C 700
Patent
active
054266122
ABSTRACT:
The number of bits of data items read in parallel fashion and the number of bits of data items written in parallel fashion are related to be at least a whole number multiple of 2, thereby to achieve enhancement in the efficiency of data transfer between a semiconductor memory device and the exterior thereof.
Further, in a semiconductor memory device of FIFO type, the number of stored data items is calculated using the values of a write counter and a read counter, thereby to achieve the accurate acquisition of the number of stored data items even when the operations of reading and writing data items coincide.
In a semiconductor memory device having a built-in address counter, the value of the address counter or an external address signal is selected on the basis of an external instruction in order to address a memory cell, thereby to achieve facilitation of random accesses to memory cells and also the clearing of the data items of any desired memory cells.
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Ichige Hiroshi
Kono Junichi
Okochi Toshio
Hitachi , Ltd.
Hoang Huan
Popek Joseph A.
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