TMDS181RGZEVM: TMDS181 Test with Quantumdata 780E

Kai Hsiao

Part Number: TMDS181RGZEVM
Other Parts Discussed in Thread: TMDS181

dear Sir

When we test TMDS181EVM with Quantumdata 780E

We need to re-click "apply updates" then quantumdata can display out normally (all of register is default ,just only re-click "apply updates")

May I know your suggest??

Please refer to below link

over 6 years ago

0 Moises Garcia over 6 years ago

TI__Mastermind 23815 points

Hi Kai,

Does ti work when you apply a reset on the board?
The default registers in the GUI may no be the same of the default registers in the TMDS181, could you send the values fo the raw registers before and after the apply updates?

Does it work in GPIO mode?

Regards

0 Kai Hsiao over 6 years ago in reply to Moises Garcia

Guru 12675 points

dear Moises

FYI

Update_CSR.txt

Default_CSR.txt

0 Moises Garcia over 6 years ago in reply to Kai Hsiao

TI__Mastermind 23815 points

Hi Kai,

The default register doesn't look like default state.

Is this issue happening with other displays?

Could you check HPD_SNK is low when there is no display connected?

If instead of doing "Apply Updates" you toggle the register 0x09[3] in the advanced register access, does it work?

Regards

0 Kai Hsiao over 6 years ago in reply to Moises Garcia

Guru 12675 points

dear Moises

We will check again

But I would like to know why register file have CSR PAGE 0 and CSR PAGE 1 ,What 's different between that

Thanks

0 Moises Garcia over 6 years ago in reply to Kai Hsiao

TI__Mastermind 23815 points

Hi Kai,

The registers in page 0 are the ones you can see in the datasheet, these are needed for normal operation.
The registers in page 1 are used for internal TI debugging, it gives us more details about the state of the device.

Regards

0 Kai Hsiao over 6 years ago in reply to Moises Garcia

Guru 12675 points

dear Moises

check the register again

Only CSR page1 have different ,below have attached file

0 Moises Garcia over 6 years ago in reply to Kai Hsiao

TI__Mastermind 23815 points

Hi Kai,

The default register still doesn't look like default state.
Is this issue happening with other displays?
Could you check HPD_SNK is low when there is no display connected?
If instead of doing "Apply Updates" you toggle the register 0x09[3] in the advanced register access, does it work?

I see you didn't add register 0x00 from page 1, is it the same for both scenarios? what is the value there?

Regards

0 JMMN over 6 years ago in reply to Moises Garcia

TI__Guru 60865 points

Hi Kai,

Can you send me screen caps of any of the screens of the EyeScan tool that you modify? Also, can I get a pic of the board jumper settings? Last, which data rate / resolution are you running in the test? I don't see a similar issue with the QD980 box in my lab so I'd like to duplicate your setup.

Thanks,

JMMN

0 Kai Hsiao over 6 years ago in reply to Moises Garcia

Guru 12675 points

Dear Sir

0x00 Register as below

When the cable insert EVM ,the HPD_SNK voltage is 4.5V

TMDS181 Test Register.rar

0 Moises Garcia over 6 years ago in reply to Kai Hsiao

TI__Mastermind 23815 points

Hi Kai,

I'm sorry for the confusion, I looking for the registers dump and voltage in HPD_SNK when the EVM is connected to the video generator but disconnected to quantum data equipment.

Regards

0 Kai Hsiao over 6 years ago in reply to Moises Garcia

Guru 12675 points

Dear Moises

I will ask our customer to check video generator's register value

But could you check the TMDS181 connect to Quantumdata's result first ?

1. below is default value without any cable on EVM

2. Below is connect input and output cable on TMDS181EVM and before click "apply update" => no display output

3. Below is connect input and output cable on TMDS181EVM and After click "apply update" => display normally

0 JMMN over 6 years ago in reply to Kai Hsiao

TI__Guru 60865 points

Hi Kai,

Can you provide a photo of the EVM so I can duplicate the jumper settings for my test? It looks like the EQ may be off.

Thanks,

JMMN

0 Kai Hsiao over 6 years ago in reply to JMMN

Guru 12675 points

Dear Jmmn

As below

0 JMMN over 6 years ago in reply to Kai Hsiao

TI__Guru 60865 points

Hi Kai,

Thanks for sharing the photo. I noticed that you have the EVM in I2C mode but you are configuring the pins (SIG_EN and PRE_SEL). The pin configurations are ignored if the EVM is put in I2C mode. Can you confirm if removing the jumper on I2C_EN fixes the need for "apply updates"?

Please note that when the TMDS181 is put in I2C mode, the TX terminations must be manually set. In my testing with a QD980 box and the same switch settings you show above, I do not need to hit "apply updates", but I do see some signal quality issues since the HDMI 2.0 terminations (75-150 ohms) are not enabled. I have tried several different sources and I have not needed to hit "apply updates" for the EVM to work with any of them.

Regards,
JMMN

0 Kai Hsiao over 6 years ago in reply to JMMN

Guru 12675 points

Dear Jmmn

Could you help to make a video
When our customer remove the jumper , still have this issue of no display

Thanks

0 JMMN over 6 years ago in reply to Kai Hsiao

TI__Guru 60865 points

Hi Kai,

Please accept the request I just sent, so I can send the video directly to you.

Thanks!
JMMN

0 JMMN over 6 years ago in reply to JMMN

TI__Guru 60865 points

Hi Kai,

Please let me know if you have received the video.

Thanks,
JMMN

0 JMMN over 6 years ago in reply to JMMN

TI__Guru 60865 points

Hi Kai,

Please let me know if you have any further questions.

Thanks,
JMMN

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TMDS181RGZEVM: TMDS181 Test with Quantumdata 780E