Hello:
Current program with the use DS90UB925Q and DS90UB926Q transmission of video signals, the specific connection in the form of: Computer graphics -> DVI decode -> DS90UB925Q-> DS90UB926Q-> DVI encoder -> display graphics output resolution of 720P @ 60HZ, but the monitor does not video output, found no DE elapsed after DS90UB926Q deserializer, HS, VS and PCLK (at this time DS90UB925Q the General Status [0x0c] register is 0x05, namely PCLK and Link were normal .DS90UB926Q the LOCK pin is high, PASS pin is low).
My basic configuration: LFMODE, Repeater, Backward Compatible, I2S Channel B are configured as L. Video data is 24bit RGB888.
I try to use DS90UB926Q generation Test pattern ([0x64]: 0x31, [0x65]: 0x04), can not be displayed correctly, after measuring DS90UB926Q end discovery data, HS, VS, DE and PCLK are present does not exist. I also tried to use DS90UB925Q output test pattern, after DS90UB926Q end result is still not deserializer DE, HS, VS and PCLK.
I do not know what caused this DS90UB926Q end No output behavior occurs because, in addition there are several other minor problems:
One problem: DS90UB926Q the LOCK pin is H mean anything, what this PLL is locked represented. PASS pin is L, does it mean that the serial data before being DS90UB926Q deserializer is wrong.
Second problem: DS90UB925Q and DS90UB926Q can generate test chart. If, DS90UB926Q in the output test pattern, can provide PCLK themselves.
Question three: Are there similar applications use the recommended configuration.