Multi-bit write feature for video RAM

Details Multi-bit write feature for video RAM Multi-bit write feature for video RAM

1983-08-30

1986-10-28

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340747, 340750, 340798, G09G 128

Patent

active

046201866

ABSTRACT:
In a video display system having a video random access memory (RAM) including a plurality of color memory banks, with one memory bank for each of the primary colors, provision is made for simultaneously writing to all of the color banks. A central processor unit (CPU) places data onto the system bus and asserts WRT-R, WRT-G and/or WRT-B signals in selectively writing at the same time to any or all of the video RAM banks, where the primary colors are red, green and blue. Logic circuitry coupled to the three RAM banks then gates designated Row and Column Address Strobe (RAS and CAS) signals to each of the color arrays followed by color video data signals. The time required to thus write video display information into the multi-bank video RAM array is thus reduced and system video data throughput correspondingly increased.

REFERENCES:
patent: 3928845 (1975-12-01), Clark
patent: 4026555 (1977-05-01), Kirschner et al.
patent: 4092728 (1978-05-01), Baltzer
patent: 4342029 (1982-07-01), Hofmanis et al.
patent: 4451824 (1984-05-01), Thayer et al.
patent: 4468814 (1984-08-01), Field

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