DS90UB921-Q1: DS90UB921 can transmit test pattern but can't transmit source data

Leilei Yue

Prodigy 30 points

Part Number: DS90UB921-Q1

RH850 D1M1 +DS90UB921----------------------->DS90UB926+LCD

RGB18bit

480*240

over 8 years ago

0 Steven(Shenzhen) Shi over 8 years ago

TI__Mastermind 30515 points

Leilei,
please check the interface between 850D1M1 and UB921, to secure the PCLK, DIN/VS/HS, and UB921 mode_sel/PDB are connected correctly, thanks.

regards,
Steven

0 Leilei Yue over 8 years ago in reply to Steven(Shenzhen) Shi

Prodigy 30 points

The Picture can transmit half.

The Lock signal is no good. High low high low

0 Steven(Shenzhen) Shi over 8 years ago in reply to Leilei Yue

TI__Mastermind 30515 points

Leilei,
if the LOCK is not stable, it seems the link has many noises. you can try the cable? connector? and the on-board supply noise? also, whether you had controlled the trace diff. impedance at 100ohms?

best regards,
Steven

Interface

Interface forum

DS90UB921-Q1: DS90UB921 can transmit test pattern but can't transmit source data