On-line verification of video display generator

Details On-line verification of video display generator On-line verification of video display generator

G - Physics

09

G

375/4

G09G 3/00 (2006.01)

Patent

CA 1254683

ABSTRACT OF THE INVENTION On-line verification apparatus of a display generation system comprises a memory which has a display portion and an inactive display portion, the display portion storing display information, and the inactive display portion storing test data. Scan logic controls a monitor, the scan logic accessing the memory at a predetermined location corresponding to a predetermined position of a scan beam of the monitor. A generator, generates display control information to provide information control signals to the scan beam thereby providing the visual display corresponding to the display information stored in the display portion of the memory. A register stores display control information generated from the test data stored in the inactive display portion of the memory, the register being enabled by a control signal generated from the scan logic indicating the end of a display frame, the control signal corresponding in time to when the test data is being accessed by the scan logic. The scan logic is operative during a period of time that the monitor is blanked, the monitor being blanked allowing the scan beam of the monitor to be positioned to a beginning point of the display. An element compares the display control information stored in the register corresponding to the test data, to an expected result, the comparison being performed during the period of time the monitor is blanked, thereby verifying on-line that the display generation system is functioning correctly.

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