DS90UB949-Q1EVM: DS90UB948-Q1EVM

Hello,
What is the PCLK freq and jitter? What type of cable are you using and what is the insertion/return loss of the cable? It is actually the quality of the cable that matters rather than just length.

Is your AEQ set to auto adapt so the EQ can adapt to optimal values? If the signal is not present or stable at the 948 input when the deserializer is powered up you can do a digital reset or AEQ_RESTART on the 948 afterwards so EQ can adapt to optimal values.

Hi,

Thank you for your quick response and help.

The cable that I am using is 15-metes Rosenberger Dacar R535 cable which is suggested in your datasheet.

The PCLK is around 75 and 70 MHz at serializer and deserializer, respectively.

Could you please explain in more detail how I can change AEQ setup? Should I do it by software or hardware?

As I mentioned before, the quality of the picture is not good. As I found in GUI software, for both serilizer and deserializer, it is mentioned that both DDCP and Repeater Mode are disabled. Do you think enabling them can help us? If yes, can you please explain how to change them? 

Thank you very much for your forthcoming response.

Thank you for your help.

Unfortunately, I do not have another cable.

Actually I did so but it did not help.

Do you have any other suggestion? Thanks.

Do you mean another cable did not help? Is it the same length or shorter cable? Does the digital reset or AEQ reset on the 948 help?

Are you following the power up and PDB requirements in the datasheet? The PDB should not be asserted until the power supplies are ramped up and at stable levels within the specification in the datasheet.

Have you verified LOCK pin is good? You can also try BIST mode to establish that the link between 948 and 949 is good. The PASS pin can be used in BIST to check if any error is detected.

Thank you for your response.
No, I mean the digital reset did not work. As I mentioned before, I do not have another cable.
The lock pin is green when I am connecting the Video source. I will check BIST and Pass LEDs later.
What do you mean PDB requirement? Deserialzier is turned on after the serialzier is turned on correctly. The current drawn by both serializer and deserialzier is reasonable and good.
What do you think about repeater mode? In both serializer and deserializer, the repeater mode is off but I do not know how can I turn it on as I asked you before.

Ok see how the BIST mode and PASS looks. For the PDB requirement you can refer to the device datasheets - basically making sure the PDB is asserted after the supplies are ramped up properly. Also making sure the power supplies are brought up in the correct sequence if specified in the datasheet.
You can also get a shorter cable to check if that helps in your setup.
The repeater application is really for extending transmission to multiple display devices over multiple links. In your case you only have a single display.

Thank you for your response.

To try more and more, I have connected 4 SMA COAX cables between the SER/DESER with a length of 0.5m. However, the picture quality is exactly the same as that of the case with using a 15-meters STP cable.

Do you have any suggestion? If I send some pictures of my setup, do you think that they may help you to solve this issue? Thanks.

Have you tried BIST and PASS?
You need to break the link into multiple pieces and see what is causing this. For eg you can use the pattern gen in 948 to verify the link to display is working correctly. In case this is not due to the FPD-Link interface between the 949 and 948.

Could you please elaborate on the recommended status of BIST and PASS?

Also, I have a question. The display show 1 and half of the original data. I mean that the display does not show a full screen picture and instead in the Y axis, the display show about 1 and half of the original picture. Do you know what is the reason? Does this can affect the quality of the picture? What do you think about the effect of EDID on the quality of the shown picture? 

Thank you for your forthcoming response.

Please refer to the 948 datasheet BIST section 8.3.15 for additional information on BIST mode and how it works.

8.3.15.1 BIST Configuration And Status
The BIST mode is enabled at the deserializer by pin (BISTEN) or BIST configuration register. The test may
select either an external PCLK or the 33 MHz internal Oscillator clock (OSC) frequency in the Serializer. In the
absence of PCLK, the user can select the internal OSC frequency at the deserializer through the BISTC pin or
BIST configuration register.
When BIST is activated at the deserializer, a BIST enable signal is sent to the serializer through the Back
Channel. The serializer outputs a test pattern and drives the link at speed. The deserializer detects the test
pattern and monitors it for errors. The deserializer PASS output pin toggles to flag each frame received
containing one or more errors. The serializer also tracks errors indicated by the CRC fields in each back channel
frame.
The BIST status can be monitored real time on the deserializer PASS pin, with each detected error resulting in a
half pixel clock period toggled LOW. After BIST is deactivated, the result of the last test is held on the PASS
output until reset (new BIST test or Power Down). A high on PASS indicates NO ERRORS were detected. A Low
on PASS indicates one or more errors were detected. The duration of the test is controlled by the pulse width
applied to the deserializer BISTEN pin. LOCK status is valid throughout the entire duration of BIST

Thank you so much for your suggestions. The problem of picture quality is solved.

Now, we have a problem with the picture shown on the display. Our display is 1080p. The picture shown on this is a one and half of the original data. I mean the picture is repeated.

I have tried the internal timing in the video control tab of the TI software and I found that when I am enabling pattern generator with 720p quality, the picture size is the same as that I have seen when I am connecting my external video source. However, when I am enabling pattern generator with 1080p quality, it shows a full screen picture without any repetitive picture.

I think the problem is that, in the HDMI tab of the serializer in the software, the active video source is detected as 1280*720 with a frequency of 75 MHz no matter what is the quality picture of the transmitted data. I think id did not care about the video source quality. The cable of the FPD link 3 is about 1 meter. 

In the datasheet, it is mentioned that your device is able to send and receive video data up to 1080p. Could you please let me know how can I change the resolution of the Serializer from 720p to 1080p?

Hello,
It is easier to miss if any later questions are added to the original thread. It would be better to create a new thread or you can click on creating a related thread so original thread is still referenced for the additional question.