Frame buffer self-test

Details Frame buffer self-test Frame buffer self-test

1987-10-26

1988-10-25

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

324121R, 358139, H04N 1704, H04N 1702

Patent

active

047807555

ABSTRACT:
A color graphic display system has self-test capability for testing system elements between the frame buffer and the display monitor inputs. The DAC output analog signals are converted to a digital signal and processed to provide an output test bit, which is input to the graphics processor. Additional self-test hardware includes address and data lines from the graphics processor to the color map for directly loading test bit patterns into the color map. The system self-tests the frame buffer, shift registers and DACs by loading various predetermined test bit patterns into the frame buffer and the color map; cycling that data through the display system; reading the test bit; comparing the output test bit values to expected values; and reporting any errors detected. The system also includes a method for self-testing the refresh counter address path into the frame buffer.

REFERENCES:
patent: 4536760 (1985-08-01), Navarro
patent: 4607288 (1986-08-01), Freyberger
patent: 4628254 (1986-12-01), Bristol
patent: 4700227 (1987-10-01), Liebel

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