Test Pattern Generation
A self-test pattern signal comes out from pin PB3/PAT. It can generate a cross hatch picture, a inverted
cross hatch picture, a whit epicture or a black picture.
8
×
8 cross hatch
Inverted 8
×
8 cross hatch
White Picture
Black Picture
The test pattern signal is generated when SELF and ENPAT are both set to “1”. This video signal will
synchronize to the free-running Hsync and Vsync, no matter which frequency is chosen. The following
diagram shows the timing relationship of cross hatch picture.
HSO
PAT
T
1
T
2
T
1
T
3
T
2
HSO
VSO
T
1
T
2
T
3
31.1kHz
60.8Hz
6us
1us
62.5ns
47.9kHz
74.9Hz
5.125us
0.625us
62.5ns
64kHz
62.5Hz
3.625us
0.875us
62.5ns
51
Содержание Diamond Scan 51
Страница 9: ...6 MultiSync MV521 Diamand Scan 51 ...
Страница 71: ...11 Monolithic triple 13 5nS CRT driver 68 ...
Страница 72: ...69 ...
Страница 73: ...70 ...
Страница 74: ...71 ...
Страница 103: ...95 SCHEMATIC DIAGRAMS 1 Video Board ...
Страница 104: ...96 2 Main Board ...