Semiconductor memory device having arithmetic means

Details Semiconductor memory device having arithmetic means Semiconductor memory device having arithmetic means

1988-11-30

1990-06-12

Moffitt, James W.

Static information storage and retrieval

Read/write circuit

Plural use of terminal

36518908, 36523003, 365195, 36518905, G11C 700, G11C 1140

Patent

active

049339001

ABSTRACT:
A single chip semiconductor memory device having an arithmetic circuit to conduct plural kinds of arithmetic operations and a mask control circuit for inhibiting a substantial change in data in memory irrespective of the operations of the arithmetic circuit when it is brought into a masking state. The semiconductor memory device takes a preset operation mode for receiving from the outside a control signal for the arithmetic circuit and the mask control circuit. This control signal for the arithmetic circuit and the mask control circuit, which is given to the semiconductor memory device when in the preset operation mode, is latched in the semiconductor memory device until the device is brought again into the preset operation mode.

REFERENCES:
patent: 4387423 (1983-06-01), King et al.
patent: 4402043 (1983-08-01), Guttag et al.
patent: 4496944 (1985-01-01), Collmeyer et al.
patent: 4680701 (1987-07-01), Cochran
"Nikkei Electronics" of Nikkei, McGraw Hill Corp., Feb. 11, 1985, pp. 219-229.
"Hitachi IC Memory Data Book", Sep. 1983, pp. 314-320.

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