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TMDS181RGZEVM: TMDS181 Test with Quantumdata 780E

Kai Hsiao
Guru 12675 points
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

  • 0
    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 in reply to Moises Garcia
    Guru 12675 points

    dear Moises

    FYI

    Fullscreen Update_CSR.txt Download 
    CSR PAGE 0
00	54
01	4D
02	44
03	53
04	31
05	38
06	31
07	20
08	01
09	02
0A	B1
0B	02
0C	00
0D	00
15	80
18	00
19	00
1A	00
1B	00
1C	00
1D	00
1E	00
1F	00
20	0A
CSR PAGE 1
00	C3
04	A0
05	00
13	F7
4C	03
4D	00
4E	55
4F	74
B0	5E
B1	88

    Fullscreen Default_CSR.txt Download 
    CSR PAGE 0
00	54
01	4D
02	44
03	53
04	31
05	38
06	31
07	20
08	01
09	02
0A	B1
0B	02
0C	00
0D	00
15	80
18	00
19	00
1A	00
1B	00
1C	00
1D	00
1E	00
1F	00
20	0A
CSR PAGE 1
00	C3
04	A0
05	00
13	07
4C	03
4D	20
4E	00
4F	70
B0	5E
B1	88

  • 0 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 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 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 in reply to Moises Garcia
    Guru 12675 points

    dear Moises 

    check the register again 

    Only CSR page1 have different ,below have attached file 

    Register.rar

  • 0 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 in reply to Moises Garcia
    TI__Guru 60870 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 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 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 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 in reply to Kai Hsiao
    TI__Guru 60870 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 in reply to JMMN
    Guru 12675 points

    Dear Jmmn

    As below 

  • 0 in reply to Kai Hsiao
    TI__Guru 60870 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 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 in reply to Kai Hsiao
    TI__Guru 60870 points
    Hi Kai,

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

    Thanks!
    JMMN
  • 0 in reply to JMMN
    TI__Guru 60870 points
    Hi Kai,

    Please let me know if you have received the video.

    Thanks,
    JMMN
  • 0 in reply to JMMN
    TI__Guru 60870 points
    Hi Kai,

    Please let me know if you have any further questions.

    Thanks,
    JMMN