Linux/DS90UB921-Q1: DS90UB921 and DS90UB948 resolution support

Xiongwei Huang60

Prodigy 220 points

Part Number: DS90UB921-Q1

Tool/software: Linux

Hello all

We have DS90UB921 as serilizer and DS90UB948 as deserlizer on our dra777p project, our display is 1920x720@24bit

while I try drive this with 94M pixel clock (calculate from panel reference ) I got display blink

and I have to get it work with 54M pixel clock ,blink disappeared

I want to know , if DS90UB921 and DS90UB948 (single lane) can support so high resolution 1920x720x24bit@60Hz ?,does band is enough ?

If support ,some special register should be set againest reset default value ?

regards

over 7 years ago

0 Davor Glisic over 7 years ago

TI__Expert 8165 points

Hello-

The DS90UB921 and DS90UB948 (single lane) can support up to 96 MHz PCLK. What is the cable length and cable type between them? Does reducing the cable length improve the situation?

Regards,
Davor

0 Xiongwei Huang60 over 7 years ago in reply to Davor Glisic

Prodigy 220 points

Hello Dovor

We have 1.5m lvds cable , does this too long ?

regards

0 Davor Glisic over 7 years ago in reply to Xiongwei Huang60

TI__Expert 8165 points

Hello-

The cable is not very long.

Please ensure PCLK meets the timing requirements (especially maximum allowable jitter) given in the datasheet. Good PCB layout is also critical to ensure no signal integrity issues. See PCB layout recommendations provided in the datasheet.

Regards,
Davor

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Linux/DS90UB921-Q1: DS90UB921 and DS90UB948 resolution support