SN65DSI83-Q1: 0x0a bit7 abnormal read back

Wilson Guo11

Part Number: SN65DSI83-Q1
Other Parts Discussed in Thread: DSI-TUNER

Hi Expert,

Recently, my customer found some units report "PLL not enabled" (0x0a bit7 turns to 0),while the function is OK. This happens frequently, and if we read back 0x0d, the value is 01. And no matter 0x0a bit7 read 0 or 1, the function is always OK.

If we manually write 0x0d with 00, display disappeared as we expected and 0x0a bit7 is 0. At this time, we write 0x0d with 01, display is OK but 0x0a bit7 is still 0.

Could you pls help on this case, is there any possible reason that might cause this issue(0x0a bit7 abnormal low)? Thanks!

Best Regards,

Wilson

over 5 years ago

0 Ikechukwu Anyiam over 5 years ago

TI__Mastermind 35130 points

Hi Wilson,

Are you also seeing the PLL_Unlock bit in register 0xE5 being set (clear this register by writing 0xFF to it the first time you read from it)?

Regards,

I.K.

0 Wilson Guo11 over 5 years ago in reply to Ikechukwu Anyiam

TI__Prodigy 570 points

Hi I.K.

0xE5 read back value is 01.

BRs,

Wilson

0 Ikechukwu Anyiam over 5 years ago in reply to Wilson Guo11

TI__Mastermind 35130 points

Hi Wilson,

It keeps reading 0x01 even after clearing the register? In this case their DSI CLK may be unstable. Can you fill out the settings in the DSI-Tuner and attach the .dsi file (press ctrl+e after filling out the settings to export the .dsi file)?

Here is a training video on how to use the tool: https://training.ti.com/configuring-sn65dsi8x-single-channel-dsi-single-link-lvds-operation

Please also provide a register dump of the DSI83.

Regards,

I.K.

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SN65DSI83-Q1: 0x0a bit7 abnormal read back