Hi ,
My ctm use VGA-> RGB 444. 1080p60.
The circuit exactly follows our EVM, however the power circuit, schmit trigger on HS/VS input, and external osc has been replaced by newer parts. I have onsite reviewed their schematic.
The configuration file(the register value) comes from slec029.
The Problem is, by default, there is no correct VSOUT outputs. It should be 60Hz positive pulse, but we can only observe the random negative pulse, which doesnt show a fixed frequency.
Then we modify the register 36h, the bit 1, VS BP,using the raw PC graphic vysnc as the VSOUT, then VSOUT has correct VSYNC output.
Customer dont want to use the VSOUT that way because the position of the image output is not correct and can not be adjusted by known registers and I also helped them tuned that. They would prefer to follow our recommend register setting.
Today I carried the TVP7002 EVM to customer, it works well, the VSOUT can output under our register setting. I compared the register value between the boards, expect for the RO register (24h,25h, which depends on input RGB signal), others are exactly the same.
I also jumped the I2C from EVM to ctm board, and try to configure the ctm board, it doesnt give correct VSOUT.
Then the issue should be from their HW side I think.
Could you kindly add your comment what is possibly the cause?
Thanks and Best Regards,
Eason