Hi team,
One of our customer's issues, I'm forwarding it below, could you please provide some troubleshooting suggestions?
When the customer was debugging DS90UB941AS - DS90UB926Q, the pclk input was normal, with 941 and 926 link locks, but no image output.
The oscilloscope measures the PCLK, DE, VS, and HS signals output by 926. The PCLK, DE, and HS signals are normal, but the VS signal is at a low level.
SOC(8155)----DSI1--->941----link1--->926
Display timing is as follows, DSI uses NonBurst_ VSPulse output. The PCLK measurement is 31.5MHz, the DE/HS signal is at 31.5KHz, and the VS signal has been consistently low.
According to the 4.6 Configuration of Sync Width for Event Mode/Burst Mode section of this manual in 941, does it mean: in NonBurst_ VSPulse, VS is generated based on the input of VSS, VSE, HSS, and HSE from DSI; In Event and Burst, VS is generated based on the VSS and HSS input from DSI.
May I ask if the lack of VS signal output is due to a configuration issue with 941, or is it due to missing VS and HS signals output by SOC DSI?
uVisWidth = '854'
uHsyncFrontPorch = '68'
uHsyncWidth = '6'
uHsyncBackPorch = '72'
uVisHeight = '480'
uVsyncFrontPorch = '35'
uVsyncWidth = '1'
uVsyncBackPorch = '9'
uPixelFreqInHz = '31500000'
Best Regards,
Amy Luo
