DS90UB960-Q1: only port0 Video is not synchronized

Hi Elec,

Thanks for your inquiry.

It appears that the DS90UB935 register maps attached below have the same value for registers 0x22 and 0x35. Could you please help to provide the register map from the DS90UB960 of port0 (sync error) and a register map from a port which is not experiencing any sync issues? Could you also let me know if you have lock between the port0 DS90UB935 and DS90UB960, and if you can communicate with the port0 DS90UB935 through remote I2C from the DS90UB960?

 Best,

Thomas

Hi Thomas,

Sorry that I attached 935 register. 

• OK 960 register dump

• abnormal 960 register dump

Could you please advise some reason why the video is not sync? Thanks.

BR,

Elec Cheng

Hi Elec,

 Thanks for your follow up.

 From the DS90UB960 register 0x18 it appears that you are using internally generated frame sync from the port0 back-channel frame clock. Is port0 consistently unable to synchronize, or is this an intermittent issue? I also saw that register 0x21 was set at 28, enabling basic synchronized forwarding on CSI-2 port0, and synchronized forwarding with line concatenation enabled for CSI-2 port1. Does switching the forwarding mode on port0 affect the ability of this port to synchronize?

 Best,

Thomas

Hi Thomas,

Thomas Bejin said:

 From the DS90UB960 register 0x18 it appears that you are using internally generated frame sync from the port0 back-channel frame clock. Is port0 consistently unable to synchronize, or is this an intermittent issue?

I am still checking this question with customer. Will let you know.

Thomas Bejin said:

I also saw that register 0x21 was set at 28, enabling basic synchronized forwarding on CSI-2 port0, and synchronized forwarding with line concatenation enabled for CSI-2 port1. Does switching the forwarding mode on port0 affect the ability of this port to synchronize?

I guess there might be some mistake here. 0x28 means 0010_1000. Both ports are the same settings, which is Synchronous forwarding with line interleaving. Thanks.

BR,

Elec Cheng

Hi Thomas,

Thanks for your support. The customer finds the issue lies in ISP. The change a new one and it works. But I still want to know the cause why 960 is "not synchronize". On the other word, what is the 960 synchronized mechanism? Understanding this will make it easier for future debug. Thanks.

BR,

Elec Cheng

Hi Elec,

Thanks for your reply, glad to know that the customer has identified the root cause of the issue. Let me confirm tomorrow with my team what could have caused the 960 to display this synchronization error.

Best,

Thomas

Hi Thomas,

Thanks.

BR,
Elec Cheng