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Original question:

TMDS181: TMDS181 no signal issue

TMDS181: No signal output when worked in 4K@60

Thomas Gan1
Prodigy 70 points

Part Number: TMDS181

Hi David,

I meet the same issue  when I used 4K@60.

https://e2e.ti.com/support/interface/f/138/t/947429?tisearch=e2e-quicksearch&keymatch=TMDS181

How to fix this issue in finally?

  • 0
    TI__Guru**** 183821 points

    Hi,

    Are you able to see the video with 4k@30?

    Can you please share your schematic and TMDS181 page 0 and page 1 register dump? To access page 1 register, please write 0x01 to register 0xFF first, and then dump register from 0x00 to 0xB1.

    Can you also probe the TMDS181 clock output and verify the clock out frequency is 150MHz for 4k@60?

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 70 points

    Hi David ,

    Thanks your quickly response.

    Yes ,4K@30 is ok.

    Please refer to the attachment for schematic and register dump.

    I upload " Register_TMDS181_4K@30" and "Register_TMDS181_4K@60" in the attachment.

    BTW,I have tried to configure the function mode to all of below modes and the termination ( 75 Ω to 150 Ω) for HDMI TX ,but the 4k@60 still can't work.

    DEV_FUNC_MODE. This field selects the device working function mode.
    00 – Redriver mode: 250 Mbps – 3.4 Gbps
    01 – Automatic redriver to retimer crossover at 1.0 Gbps (default)
    10 – Automatic retimer when HDMI2.0a based upon
    TMDS_CLOCK_RATIO_STATUS
    11 – Retimer mode across full range 250 Mbps to 6 Gbps

    distribute_output_card.pdf

    Fullscreen Register_TMDS181_4K@30.txt Download 
    page 0:
~ # i2c_read 0 0xB9 0x0 0xff 0x1 0x1 0x1
*** Board tools : ver0.0.1_20121120 *** 
[debug]: {source/utils/cmdshell.c:167}cmdstr:i2c_read
i2c_num:0x0, dev_addr:0xb9; reg_addr:0x 0; reg_addr_end:0xff; reg_width: 1; data_width: 1; reg_step:0x 1. 

0x0 0x54
0x1 0x4d
0x2 0x44
0x3 0x53
0x4 0x31
0x5 0x38
0x6 0x31
0x7 0x20
0x8 0x1
0x9 0x2
0xa 0xb1
0xb 0x0
0xc 0x0
0xd 0x0
0xe 0x0
0xf 0xf
0x10 0x0
0x11 0x0
0x12 0x0
0x13 0x0
0x14 0x0
0x15 0x80
0x16 0x0
0x17 0x60
0x18 0x0
0x19 0x0
0x1a 0xc7
0x1b 0x2
0x1c 0xd
0x1d 0x8
0x1e 0x8
0x1f 0x0
0x20 0xa
0x21 0x0
0x22 0x0
0x23 0x0
0x24 0x0
0x25 0x0
0x26 0x0
0x27 0x0
0x28 0x0
0x29 0x0
0x2a 0x0
0x2b 0x0
0x2c 0x0
0x2d 0x0
0x2e 0x0
0x2f 0x0
0x30 0x0
0x31 0x0
0x32 0x0
0x33 0x0
0x34 0x0
0x35 0x0
0x36 0x0
0x37 0x0
0x38 0x0
0x39 0x0
0x3a 0x0
0x3b 0x0
0x3c 0x0
0x3d 0x0
0x3e 0x0
0x3f 0x0
0x40 0x0
0x41 0x0
0x42 0x0
0x43 0x0
0x44 0x0
0x45 0x0
0x46 0x0
0x47 0x0
0x48 0x0
0x49 0x0
0x4a 0x0
0x4b 0x0
0x4c 0x0
0x4d 0x0
0x4e 0x0
0x4f 0x0
0x50 0x0
0x51 0x0
0x52 0x0
0x53 0x0
0x54 0x0
0x55 0x0
0x56 0x0
0x57 0x0
0x58 0x0
0x59 0x0
0x5a 0x0
0x5b 0x0
0x5c 0x0
0x5d 0x0
0x5e 0x0
0x5f 0x0
0x60 0x0
0x61 0x0
0x62 0x0
0x63 0x0
0x64 0x0
0x65 0x0
0x66 0x0
0x67 0x0
0x68 0x0
0x69 0x0
0x6a 0x0
0x6b 0x0
0x6c 0x0
0x6d 0x0
0x6e 0x0
0x6f 0x0
0x70 0x0
0x71 0x0
0x72 0x0
0x73 0x0
0x74 0x0
0x75 0x0
0x76 0x0
0x77 0x0
0x78 0x0
0x79 0x0
0x7a 0x0
0x7b 0x0
0x7c 0x0
0x7d 0x0
0x7e 0x0
0x7f 0x0
0x80 0x0
0x81 0x0
0x82 0x0
0x83 0x0
0x84 0x0
0x85 0x0
0x86 0x0
0x87 0x0
0x88 0x0
0x89 0x0
0x8a 0x0
0x8b 0x0
0x8c 0x0
0x8d 0x0
0x8e 0x0
0x8f 0x0
0x90 0x0
0x91 0x0
0x92 0x0
0x93 0x0
0x94 0x0
0x95 0x0
0x96 0x0
0x97 0x0
0x98 0x0
0x99 0x0
0x9a 0x0
0x9b 0x0
0x9c 0x0
0x9d 0x0
0x9e 0x0
0x9f 0x0
0xa0 0x0
0xa1 0x0
0xa2 0x0
0xa3 0x0
0xa4 0x0
0xa5 0x0
0xa6 0x0
0xa7 0x0
0xa8 0x0
0xa9 0x0
0xaa 0x0
0xab 0x0
0xac 0x0
0xad 0x0
0xae 0x0
0xaf 0x0
0xb0 0x0
0xb1 0x0
0xb2 0x0
0xb3 0x0
0xb4 0x0
0xb5 0x0
0xb6 0x0
0xb7 0x0
0xb8 0x0
0xb9 0x0
0xba 0x0
0xbb 0x0
0xbc 0x0
0xbd 0x0
0xbe 0x0
0xbf 0x0
0xc0 0x0
0xc1 0x0
0xc2 0x0
0xc3 0x0
0xc4 0x0
0xc5 0x0
0xc6 0x0
0xc7 0x0
0xc8 0x0
0xc9 0x0
0xca 0x0
0xcb 0x0
0xcc 0x0
0xcd 0x0
0xce 0x0
0xcf 0x0
0xd0 0x0
0xd1 0x0
0xd2 0x0
0xd3 0x0
0xd4 0x0
0xd5 0x0
0xd6 0x0
0xd7 0x0
0xd8 0x0
0xd9 0x0
0xda 0x0
0xdb 0x0
0xdc 0x0
0xdd 0x0
0xde 0x0
0xdf 0x0
0xe0 0x0
0xe1 0x0
0xe2 0x0
0xe3 0x0
0xe4 0x0
0xe5 0x0
0xe6 0x0
0xe7 0x0
0xe8 0x0
0xe9 0x0
0xea 0x0
0xeb 0x0
0xec 0x0
0xed 0x0
0xee 0x0
0xef 0x0
0xf0 0x0
0xf1 0x0
0xf2 0x0
0xf3 0x0
0xf4 0x0
0xf5 0x0
0xf6 0x0
0xf7 0x0
0xf8 0x0
0xf9 0x0
0xfa 0x0
0xfb 0x0
0xfc 0x0
0xfd 0x0
0xfe 0x0
0xff 0x0
[END]
~ # 
Page 1:
~ # i2c_write 0 0xB8 0xff 0x1
*** Board tools : ver0.0.1_20121120 *** 
[debug]: {source/utils/cmdshell.c:167}cmdstr:i2c_write
dev_addr:0xb8; reg_addr:0xff; reg_value:0x 1; reg_width: 1; data_width: 1.
[END]
~ # i2c_read 0 0xB9 0x0 0xff 0x1 0x1 0x1
*** Board tools : ver0.0.1_20121120 *** 
[debug]: {source/utils/cmdshell.c:167}cmdstr:i2c_read
i2c_num:0x0, dev_addr:0xb9; reg_addr:0x 0; reg_addr_end:0xff; reg_width: 1; data_width: 1; reg_step:0x 1. 

0x0 0xc3
0x1 0x1
0x2 0x3f
0x3 0x0
0x4 0xa0
0x5 0x0
0x6 0x0
0x7 0x0
0x8 0x4
0x9 0x0
0xa 0x0
0xb 0x33
0xc 0x0
0xd 0x0
0xe 0x11
0xf 0x0
0x10 0xf
0x11 0x0
0x12 0x0
0x13 0x7
0x14 0x0
0x15 0x0
0x16 0x0
0x17 0x0
0x18 0x0
0x19 0x0
0x1a 0x0
0x1b 0x0
0x1c 0x0
0x1d 0x0
0x1e 0x0
0x1f 0x0
0x20 0x0
0x21 0x0
0x22 0x0
0x23 0x0
0x24 0x0
0x25 0x0
0x26 0x0
0x27 0x0
0x28 0x0
0x29 0x0
0x2a 0x0
0x2b 0x0
0x2c 0x0
0x2d 0x0
0x2e 0x0
0x2f 0x0
0x30 0x7
0x31 0x30
0x32 0x8
0x33 0x0
0x34 0x0
0x35 0x0
0x36 0x0
0x37 0x0
0x38 0x8
0x39 0x0
0x3a 0x8
0x3b 0x8
0x3c 0x4
0x3d 0x6
0x3e 0x0
0x3f 0x0
0x40 0x80
0x41 0x80
0x42 0x80
0x43 0x80
0x44 0xff
0x45 0x0
0x46 0x0
0x47 0x0
0x48 0xff
0x49 0x3f
0x4a 0x3f
0x4b 0xff
0x4c 0x3
0x4d 0x10
0x4e 0x33
0x4f 0x70
0x50 0x0
0x51 0x0
0x52 0x0
0x53 0x0
0x54 0x0
0x55 0x0
0x56 0x0
0x57 0x0
0x58 0x0
0x59 0x0
0x5a 0x0
0x5b 0x0
0x5c 0x40
0x5d 0x40
0x5e 0x40
0x5f 0x40
0x60 0x0
0x61 0x0
0x62 0x0
0x63 0x0
0x64 0x0
0x65 0x0
0x66 0x0
0x67 0x0
0x68 0x0
0x69 0x0
0x6a 0x0
0x6b 0x0
0x6c 0x0
0x6d 0x0
0x6e 0x0
0x6f 0x0
0x70 0x0
0x71 0x0
0x72 0x0
0x73 0x0
0x74 0x0
0x75 0x0
0x76 0x0
0x77 0x0
0x78 0x0
0x79 0x0
0x7a 0x0
0x7b 0x0
0x7c 0x0
0x7d 0x0
0x7e 0x0
0x7f 0x0
0x80 0x0
0x81 0x20
0x82 0x0
0x83 0x0
0x84 0x0
0x85 0x0
0x86 0x0
0x87 0x0
0x88 0x0
0x89 0x0
0x8a 0x0
0x8b 0x0
0x8c 0x0
0x8d 0x0
0x8e 0x0
0x8f 0x0
0x90 0x0
0x91 0x0
0x92 0x0
0x93 0x0
0x94 0x0
0x95 0x0
0x96 0x0
0x97 0x0
0x98 0x0
0x99 0x0
0x9a 0x0
0x9b 0x0
0x9c 0x0
0x9d 0x0
0x9e 0x0
0x9f 0x0
0xa0 0x0
0xa1 0x0
0xa2 0x1
0xa3 0x0
0xa4 0x0
0xa5 0x0
0xa6 0x0
0xa7 0x0
0xa8 0x0
0xa9 0x0
0xaa 0x0
0xab 0x0
0xac 0x0
0xad 0x0
0xae 0x0
0xaf 0x0
0xb0 0xbe
0xb1 0x88
0xb2 0x0
0xb3 0x0
0xb4 0x0
0xb5 0x0
0xb6 0x0
0xb7 0x0
0xb8 0x0
0xb9 0x0
0xba 0x0
0xbb 0x0
0xbc 0x0
0xbd 0x0
0xbe 0x0
0xbf 0x0
0xc0 0x0
0xc1 0x0
0xc2 0x0
0xc3 0x0
0xc4 0x0
0xc5 0x0
0xc6 0x0
0xc7 0x0
0xc8 0x0
0xc9 0x0
0xca 0x0
0xcb 0x0
0xcc 0x0
0xcd 0x0
0xce 0x0
0xcf 0x0
0xd0 0x0
0xd1 0x0
0xd2 0x0
0xd3 0x0
0xd4 0x0
0xd5 0x0
0xd6 0x0
0xd7 0x0
0xd8 0x0
0xd9 0x0
0xda 0x0
0xdb 0x0
0xdc 0x0
0xdd 0x0
0xde 0x0
0xdf 0x0
0xe0 0x0
0xe1 0x0
0xe2 0x0
0xe3 0x0
0xe4 0x0
0xe5 0x0
0xe6 0x0
0xe7 0x0
0xe8 0x0
0xe9 0x0
0xea 0x0
0xeb 0x0
0xec 0x0
0xed 0x0
0xee 0x0
0xef 0x0
0xf0 0x0
0xf1 0x0
0xf2 0x0
0xf3 0x0
0xf4 0x0
0xf5 0x0
0xf6 0x0
0xf7 0x0
0xf8 0x0
0xf9 0x0
0xfa 0x0
0xfb 0x0
0xfc 0x0
0xfd 0x0
0xfe 0x0
0xff 0x1
[END]
~ #
    Fullscreen Register_TMDS181_4K@60.txt Download 
    Page 0:

~ # i2c_read 0 0xB9 0x0 0xff 0x1 0x1 0x1
*** Board tools : ver0.0.1_20121120 *** 
[debug]: {source/utils/cmdshell.c:167}cmdstr:i2c_read
i2c_num:0x0, dev_addr:0xb9; reg_addr:0x 0; reg_addr_end:0xff; reg_width: 1; data_width: 1; reg_step:0x 1. 

0x0 0x54
0x1 0x4d
0x2 0x44
0x3 0x53
0x4 0x31
0x5 0x38
0x6 0x31
0x7 0x20
0x8 0x1
0x9 0x2
0xa 0x33
0xb 0x18
0xc 0x0
0xd 0x0
0xe 0x0
0xf 0xf
0x10 0x0
0x11 0x0
0x12 0x0
0x13 0x0
0x14 0x0
0x15 0x80
0x16 0x0
0x17 0x70
0x18 0x0
0x19 0x0
0x1a 0xc5
0x1b 0x2
0x1c 0x1
0x1d 0x8
0x1e 0x8
0x1f 0x0
0x20 0xa
0x21 0x0
0x22 0x0
0x23 0x0
0x24 0x0
0x25 0x0
0x26 0x0
0x27 0x0
0x28 0x0
0x29 0x0
0x2a 0x0
0x2b 0x0
0x2c 0x0
0x2d 0x0
0x2e 0x0
0x2f 0x0
0x30 0x0
0x31 0x0
0x32 0x0
0x33 0x0
0x34 0x0
0x35 0x0
0x36 0x0
0x37 0x0
0x38 0x0
0x39 0x0
0x3a 0x0
0x3b 0x0
0x3c 0x0
0x3d 0x0
0x3e 0x0
0x3f 0x0
0x40 0x0
0x41 0x0
0x42 0x0
0x43 0x0
0x44 0x0
0x45 0x0
0x46 0x0
0x47 0x0
0x48 0x0
0x49 0x0
0x4a 0x0
0x4b 0x0
0x4c 0x0
0x4d 0x0
0x4e 0x0
0x4f 0x0
0x50 0x0
0x51 0x0
0x52 0x0
0x53 0x0
0x54 0x0
0x55 0x0
0x56 0x0
0x57 0x0
0x58 0x0
0x59 0x0
0x5a 0x0
0x5b 0x0
0x5c 0x0
0x5d 0x0
0x5e 0x0
0x5f 0x0
0x60 0x0
0x61 0x0
0x62 0x0
0x63 0x0
0x64 0x0
0x65 0x0
0x66 0x0
0x67 0x0
0x68 0x0
0x69 0x0
0x6a 0x0
0x6b 0x0
0x6c 0x0
0x6d 0x0
0x6e 0x0
0x6f 0x0
0x70 0x0
0x71 0x0
0x72 0x0
0x73 0x0
0x74 0x0
0x75 0x0
0x76 0x0
0x77 0x0
0x78 0x0
0x79 0x0
0x7a 0x0
0x7b 0x0
0x7c 0x0
0x7d 0x0
0x7e 0x0
0x7f 0x0
0x80 0x0
0x81 0x0
0x82 0x0
0x83 0x0
0x84 0x0
0x85 0x0
0x86 0x0
0x87 0x0
0x88 0x0
0x89 0x0
0x8a 0x0
0x8b 0x0
0x8c 0x0
0x8d 0x0
0x8e 0x0
0x8f 0x0
0x90 0x0
0x91 0x0
0x92 0x0
0x93 0x0
0x94 0x0
0x95 0x0
0x96 0x0
0x97 0x0
0x98 0x0
0x99 0x0
0x9a 0x0
0x9b 0x0
0x9c 0x0
0x9d 0x0
0x9e 0x0
0x9f 0x0
0xa0 0x0
0xa1 0x0
0xa2 0x0
0xa3 0x0
0xa4 0x0
0xa5 0x0
0xa6 0x0
0xa7 0x0
0xa8 0x0
0xa9 0x0
0xaa 0x0
0xab 0x0
0xac 0x0
0xad 0x0
0xae 0x0
0xaf 0x0
0xb0 0x0
0xb1 0x0
0xb2 0x0
0xb3 0x0
0xb4 0x0
0xb5 0x0
0xb6 0x0
0xb7 0x0
0xb8 0x0
0xb9 0x0
0xba 0x0
0xbb 0x0
0xbc 0x0
0xbd 0x0
0xbe 0x0
0xbf 0x0
0xc0 0x0
0xc1 0x0
0xc2 0x0
0xc3 0x0
0xc4 0x0
0xc5 0x0
0xc6 0x0
0xc7 0x0
0xc8 0x0
0xc9 0x0
0xca 0x0
0xcb 0x0
0xcc 0x0
0xcd 0x0
0xce 0x0
0xcf 0x0
0xd0 0x0
0xd1 0x0
0xd2 0x0
0xd3 0x0
0xd4 0x0
0xd5 0x0
0xd6 0x0
0xd7 0x0
0xd8 0x0
0xd9 0x0
0xda 0x0
0xdb 0x0
0xdc 0x0
0xdd 0x0
0xde 0x0
0xdf 0x0
0xe0 0x0
0xe1 0x0
0xe2 0x0
0xe3 0x0
0xe4 0x0
0xe5 0x0
0xe6 0x0
0xe7 0x0
0xe8 0x0
0xe9 0x0
0xea 0x0
0xeb 0x0
0xec 0x0
0xed 0x0
0xee 0x0
0xef 0x0
0xf0 0x0
0xf1 0x0
0xf2 0x0
0xf3 0x0
0xf4 0x0
0xf5 0x0
0xf6 0x0
0xf7 0x0
0xf8 0x0
0xf9 0x0
0xfa 0x0
0xfb 0x0
0xfc 0x0
0xfd 0x0
0xfe 0x0
0xff 0x0
[END]
~ # 

Page 1:

~ # i2c_write 0 0xB8 0xff 0x1
*** Board tools : ver0.0.1_20121120 *** 
[debug]: {source/utils/cmdshell.c:167}cmdstr:i2c_write
dev_addr:0xb8; reg_addr:0xff; reg_value:0x 1; reg_width: 1; data_width: 1.
[END]
~ # i2c_read 0 0xB9 0x0 0xff 0x1 0x1 0x1
*** Board tools : ver0.0.1_20121120 *** 
[debug]: {source/utils/cmdshell.c:167}cmdstr:i2c_read
i2c_num:0x0, dev_addr:0xb9; reg_addr:0x 0; reg_addr_end:0xff; reg_width: 1; data_width: 1; reg_step:0x 1. 

0x0 0xc3
0x1 0x1
0x2 0x3f
0x3 0x0
0x4 0xa0
0x5 0x0
0x6 0x0
0x7 0x0
0x8 0x2
0x9 0x0
0xa 0x0
0xb 0x33
0xc 0x0
0xd 0x0
0xe 0x11
0xf 0x0
0x10 0xf
0x11 0x70
0x12 0x0
0x13 0x7
0x14 0x0
0x15 0x0
0x16 0x0
0x17 0x0
0x18 0x0
0x19 0x0
0x1a 0x0
0x1b 0x0
0x1c 0x0
0x1d 0x0
0x1e 0x0
0x1f 0x0
0x20 0x0
0x21 0x0
0x22 0x0
0x23 0x0
0x24 0x0
0x25 0x0
0x26 0x0
0x27 0x0
0x28 0x0
0x29 0x0
0x2a 0x0
0x2b 0x0
0x2c 0x0
0x2d 0x0
0x2e 0x0
0x2f 0x0
0x30 0x7
0x31 0x70
0x32 0x8
0x33 0x0
0x34 0x0
0x35 0x0
0x36 0x0
0x37 0x0
0x38 0x8
0x39 0x0
0x3a 0x8
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[END]
~ #




  • 0 in reply to David (ASIC) Liu
    Prodigy 70 points

    Yes ,I can probe the TMDS181 clock output is 150Mhz for 4k@60 in FPGA receive side.

    Info
    -----

    ------------
    HDMI RX SubSystem
    ------------

    ->HDMI RX Subsystem Cores
    : HDMI RX
    HDMI RX version : 03.00 (0403)

    HDMI RX Mode - DVI
    ------------
    HDMI RX timing
    ------------
    No HDMI RX stream
    Link quality
    ---------
    Link quality channel 0 : bad (65535)
    Link quality channel 1 : bad (65535)
    Link quality channel 2 : bad (65535)
    Audio
    ---------
    Format : Unknown
    Channels : 2
    ACR CTS : 0
    ACR N : 0
    Infoframe
    ---------
    RX header: 0

    ------------
    HDMI PHY
    ------------
    VPhy version : 02.02 (0000)

    GT status
    ---------
    RX reference clock frequency: 148498432 Hz
    DRU reference clock frequency: 125000000 Hz
    RX: CPLL
    RX state: ready

    CPLL settings
    -------------
    M : 1 - N1 : 5 - N2 : 4 - D : 1

    RX MMCM settings
    -------------
    Mult : 8 - Div : 1 - Clk0Div : 4 - Clk1Div : 8 - Clk2Div : 4

    DRU Settings
    -------------
    Version : 7
    DRU is disabled

    buffer:5,0040438780
    buffer:5,0040438780

  • 0 in reply to Thomas Gan1
    TI__Guru**** 183821 points

    Hi,

    There are two issues with this design that I saw from the schematic.

    1. TMDS181 supports DC-coupled HDMI, for AC-coupled HDMI, you need to use the DP159. 

    2. The TMDS181 DDC snoop mode is not implemented. The DDC snoop mode needs to be implemented so the TMDS_CLOCK_RATIO_STATUS bit switch between HDMI1.4 (Register 0x0B bit 1 = 0) and HDMI 2.0 (Register 0x0B bit 1 = 1). If the snoop mode is not implemented, then you need to manually switch the TMDS_CLOCK_RATIO_STATUS bit between HDMI1.4 and 2.0.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 70 points

    Hi David,

    According to your suggestion ,4K@60 can work now.

    Thanks your great support.

  • 0 in reply to David (ASIC) Liu
    Prodigy 90 points

    Hi David

      I have some questions  about TMDS181 with your help3022.I2C register dump.TXT2671.TMDS181-OUTPUT-SCH.pdf

    Using TMDS181RGZT and TPD12S016RKTR to build the HDMI signal channel between FPGA and display (FPGA is the sending end and the display is the receiving end).

    The current problem is: HDMI don't output to 4K or 1080P via i2c mode ,but HDMI signal can display via pin strap mode.

    Do you have any suggestion why TMDS181 don't have output via I2C mode?

  • 0 in reply to WANG
    TI__Guru**** 183821 points

    Hi, 

    Please see my response to your question in this ticket: 

    Thanks

    David