DS90UB954-Q1: Video streaming issue with one particular board

SHIJU R

Part Number: DS90UB954-Q1
Other Parts Discussed in Thread: DS90UB953-Q1,

Tool/software:

Hi Team,

I have used the part DS90UB954-Q1 De-Serializer in my board and with DS90UB953-Q1 Combinations in Camera Module. One of my board iam facing video streaming issue ,MIPI output is not coming from the Deserializer. When connecting the same camera to the other board video stream getting properly. One particular board having issue with DS90UB954-Q1 De-Serializer. The configurations we are applying are same for both working board and Non working board. Pease refer the below register status read out from both boards. In Non working board it seems CSI disabled (With 0x33 status read) . Is there any internal diagnostics making this CSI disable? Can you please guide me for further debug.

We are only using one port RX0.

Register Address DS90UB954-Q1	Non Working Board	working board	Remarks
0x04	0xdf	0xdf	TRUE
0x05	0x01	0x01	TRUE
0x06	0x00	0x00	TRUE
0x4D	0x13	0x13	TRUE
0x4E	0x04	0x6d	FALSE
0x55	0x00	0x00	TRUE
0x56	0x00	0x00	TRUE
0x57	0x00	0x00	TRUE
0x7A	0x00	0x00	TRUE
0x7B	0x00	0x00	TRUE
0xB9	0x33	0x33	TRUE
0xD0	0x00	0x00	TRUE
0x24	0x00	0x00	TRUE
0x36	0x00	0x00	TRUE
0x37	0x00	0x00	TRUE
0x35	0x00	0x01	FALSE
0x73	0x00	0x05	FALSE
0x74	0x00	0x14	FALSE
0x75	0x00	0x06	FALSE
0x7C	0x20	0x20	TRUE
0x7D	0x00	0x00	TRUE
0xB3	0x00	0x08	FALSE
0x6D	0x78	0x7c	FALSE
0xB8	0x88	0x8c	FALSE
0x33	0x00	0x01	FALSE

Thanks Regards

SHIJU.R

10 months ago

0 Thomas Bejin 10 months ago

TI__Mastermind 24861 points

Hi Shiju,

Do you know if the camera is streaming on the non-working board? I can see that the SER/DES are locked in register 0x4D, however in the line count and line length registers (0x73-0x76) are all 0x00 on the non-working board.

Best,

Thomas

0 Thomas Bejin 10 months ago in reply to Thomas Bejin

TI__Mastermind 24861 points

Hi Shuji,

One other item to bring-up, there's a different strap for coax vs STP mode on the des in register 0x6D. Mode is also different in register 0xB8. Do you know if the voltage on the mode pin & voltage divider which selects it is the same?

Best,

Thomas

0 SHIJU R 10 months ago in reply to Thomas Bejin

Prodigy 50 points

Hi Thomas,

Voltage at the Mode pin is same for both boards. But while reading the registers those mode seems different. Any other reason will be there for this kind mode mode change other than mode pin settings?

0 Thomas Bejin 10 months ago in reply to SHIJU R

TI__Mastermind 24861 points

Hi Shiju,

The mode is set at power-up, could you confirm that the power sequence is correct here? Included reference from the datasheet below:

Best,

Thomas

0 SHIJU R 10 months ago in reply to Thomas Bejin

Prodigy 50 points

Hi Thomas,

Sorry for the late reply

Here Green is 1.8V , Yellow internal 1.1V and Orange is PDB Pin ,

Internal 1.1V is generated along with 1.8V input. Is is may be due to any internal failure?

0 Thomas Bejin 10 months ago in reply to SHIJU R

TI__Mastermind 24861 points

Hi,

Let me check back on the details of this tomorrow for you.

Best,

Thomas

0 Thomas Bejin 10 months ago in reply to Thomas Bejin

TI__Mastermind 24861 points

Hi Shuji,

I don't see the mode pin in the power sequence, do you know if this can be captured as well? Looking back at the abnormal registers I can see that the mode was strapped incorrectly, the pin may not have stabilized by the time PDB reached logic high.

Best,

Thomas

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DS90UB954-Q1: Video streaming issue with one particular board