SN65DP159: Question about SN65DP159RSB.

Masazumi Ishii

Part Number: SN65DP159

Hello

I have a question about SN65DP159RSB.

We have received an answer previously with this title and it was carried out. (Output stop)

Contents
Perform the following work.

Write 0xF0 to 0x10 of page 1.
Stop the output on the Tx side.

{0xFF, 0x01}, // Select Page 1

{0x10, 0xF0}, // Disable all Tx Lanes

{0xFF, 0x00}, // Select Page 0

However, although I wrote to register 0xF0 in the register, the output did not stop.

In addition, we confirmed the following.

· 0x0F in signal output state

· After reading 0xF0, reading it again gets 0x0F

· When the cable is not connected, 0XF0

As a result, the output is automatically set, and in order to change here

It is necessary to switch to manual setting mode.

Is this content correct?

Thank you.

over 6 years ago

0 David (ASIC) Liu over 6 years ago

TI__Guru**** 177396 points

Masazumi-san

Are you using DP159 in DP retimer mode and are you also in I2C mode? Would you please check to make sure I2C_EN is high?

Thanks
David

0 Masazumi Ishii over 6 years ago in reply to David (ASIC) Liu

Genius 3945 points

HI.

Thank you for your reply.

We are using HDMI in Source Mode. (0 Ah 7 BIT: 0)

ReTimer setting is auto setting. (0 Ah [1: 0] BIT: 01)

I also use I2C.
I2C_EN pin is used at high level.

Thank you.

0 David (ASIC) Liu over 6 years ago in reply to Masazumi Ishii

TI__Guru**** 177396 points

Masazumi-san

Let me see if I can duplicate this on my EVM and then reply back to you.

Thanks
David

0 Masazumi Ishii over 6 years ago in reply to David (ASIC) Liu

Genius 3945 points

Hello

thank you for your answer.

I can not do it because I do not have EVM of SN 65DP 159 RSB, but I tried it because there was EVM of TMDS 181.

The result is as attached.
The setting is not reflected. (I can not set it)

Why?

Thank you.

TMDS181REG.pdf

0 Masazumi Ishii over 6 years ago in reply to Masazumi Ishii

Genius 3945 points

Hello

There are additional items in the mail of the other day.
Although it was not described by the specification,
I want to stop the output in the state where the signal is input to the Rx side (the cable is connected).

What to check
· How to write 0xF0 to 0x10 of page 1
· How to stop other output signals

Thank you.

0 Nicholaus_Malone over 6 years ago in reply to Masazumi Ishii

TI__Mastermind 27925 points

Masazumi-san,

David is out on vacation for a little while, so I will be helping you. The 0x10 register may be autonomously updated by the DP159. Could you try writing a 0 to bit 3 on register 0x09 (PD_EN)? This should disable the output.

Regards,

0 Masazumi Ishii over 6 years ago in reply to Nicholaus_Malone

Genius 3945 points

Hello.

thank you for your answer.

Register will change automatically.
But is there a way to stop only the output without changing registers or turning to power down mode?

Thank you.

0 David (ASIC) Liu over 6 years ago in reply to Masazumi Ishii

TI__Guru**** 177396 points

Masazumi-san

We will check on our EVM, would you please send me a scope capture of the transmitter output when 0xF0 (disable) and 0xF0 (enable) is written to register 0x10h at page 1?

Thanks
David

0 Satoshi Yoshida over 6 years ago in reply to David (ASIC) Liu

TI__Prodigy 660 points

Hi David-san,
Please allow me to interrupt this thread.
I'm working together with Masazumi-san for supporting customer.

We have tried to disable TX depends on your advice,
   > {0xFF, 0x01} , // Select Page 1
   >   {0x10, 0xF0} , //Disable all Tx Lanes
   > {0xFF, 0x00} , // Select Page 0
but unfortunately it couldn't go well.

And then we've confirmed below as the result of reading this register,
      0x0F .... read under normal operation, no register writing (connected cable, outputted TX)
    0x0F .... read after writing "0xF0" (cable: connected) -> overwritten automatically???
      0xF0 .... read after writing "0xF0" (cable: NOT connected)
It seems the register was overwritten automatically, is the behavior collect?
You had commented before,
    "Are you using DP159 in DP retimer mode and are you also in I2C mode?"
Does it mean that setting this register is not applicable in redriver mode?
Need to set "Automatic retimer for HDMI2.0" or anything else (shown on the datasheet P.36)?

Best regards,
Satoshi

0 David (ASIC) Liu over 6 years ago in reply to Satoshi Yoshida

TI__Guru**** 177396 points

Satoshi-san

If this is a HDMI application, then enable/disable TX are automatically handled by the DP159.

You can control enable/disable TX lanes in x-mode.

Thanks
David

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SN65DP159: Question about SN65DP159RSB.