Semiconductor memory capable of executing logical operation

Details Semiconductor memory capable of executing logical operation Semiconductor memory capable of executing logical operation

1986-07-08

1989-05-16

Hecker, Stuart N.

Static information storage and retrieval

Read/write circuit

Including specified plural element logic arrangement

365205, 365207, 365210, 307465, 307468, G11C 700, G11C 1140

Patent

active

048315915

ABSTRACT:
A semiconductor memory is capable of executing a logical operation, which comprises at least one sense amplifier having a pair of inputs connected to a pair of bit lines; and a pair of output lines connected to the pair of bit lines, respectively. At least a pair of memory cells and a pair of dummy cells are connected to the pair of bit lines, respectively. Further, at least a pair of word lines are connected to the pair of memory cells, respectively, and a pair of dummy word lines connected to the pair of dummy cells, respectively. A word selecting circuit is connected to the pair of word lines and is capable of activating the pair of word lines at the same time. In addition, a dummy cell selecting circuit is connected to the pair of dummy word lines and adapted to alternatively activate the pair of dummy cells. A controller is provided for controlling the word selecting circuit and the dummy cell selecting circuit so that the sense amplifier is activated after the pair of word lines is activated by the word selecting circuit and a selected one of the dummy cells is activated by the dummy cell selecting circuit. As a result, the result of a logical operation on two bits of data respectively read from the pair of memory cells will be outputted on the pair of data lines.

REFERENCES:
patent: 4203159 (1980-05-01), Wanlas
patent: 4292676 (1981-09-01), Henig
patent: 4310902 (1982-01-01), Broughton
patent: 4409499 (1983-10-01), Zapisek et al.
patent: 4418293 (1983-11-01), McAlexander, III et al.
patent: 4546273 (1985-10-01), Osman
patent: 4583012 (1986-04-01), Smith et al.

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