Storage control system that prohibits writing in certain areas

Details Storage control system that prohibits writing in certain areas Storage control system that prohibits writing in certain areas

1995-10-19

1998-07-07

Swann, Tod R.

Computer graphics processing and selective visual display system

Computer graphic processing system

Interface

345521, G06F 1562

Patent

active

057776326

ABSTRACT:
In a display memory 10, a display data storage area designation register 11 designates a display data storage area, and a mask bit width designation register 12 designates a write mask bit width. According to certain data provided by address parameters of a re-writable memory, the display data storage area designation register, and the mask bit width designation register, a mask control signal generator 13 provides a mask control signal for an external address data to a write control unit 14. The mask control signal is generated from a set of comparisons based on the width of the re-writable memory and the mask bit width to determine what data in the memory may be re-written. The write control unit 14 writes only certain bits of external write data into the display memory 10.

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Patent Abstracts of Japan, vol. 12, No. 291 (E-644), Aug. 9, 1988.

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