Memory system

Details Memory system Memory system

G - Physics

11

C

354/237

G11C 8/00 (2006.01) G11C 7/00 (2006.01) G11C 7/22 (2006.01) G11C 8/12 (2006.01) G11C 8/18 (2006.01)

Patent

CA 1262969

ABSTRACT OF THE DISCLOSURE A memory system provided with two data buffers respectively in the word and bit directions thereof and capable of selecting the two data buffers and controlling the input/output directions of the data buffer selected so as to be able to provide both word and bit accesses. The memory system includes a word-direction read inhibit mask means to inhibit mask reading on given memories existing in a word direction in a memory array, word-direction write inhibit mask means to inhibit mask writing on the above memory, and bit-direction inhibit mask means to inhibit mask reading or writing on the memories existing in a bit direction in the memory array. To be able to detect a given color code out of color codes stored in an image memory quickly in the word access, outputs are inverted for each screen of the image memory, and when the color code to be detected exists all bits in a pixel output are set to "is". To realize a multi-function memory system, the memory system is equipped with a command function permitting realization of various modes, structures and opera- tions, and a chip select function allowing the image memory and program memory to coexist.

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