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DS160PR410: Power-On Default Equalization Configuration at I2C Slave Mode ?

MINHO BAEK
Prodigy 40 points

Part Number: DS160PR410

Hello Team, 

I have a question about Power-On Default Equalization Configuration at I2C Slave Mode.

in documents(DS160PR410 Programming Guide) , default values are listed below.

- default value of reg_03 : 0x80

- default value of reg_04 : 0x16

It seems that the default values are not listed in the CTLE Index Table. (Table 8 of documents)

Q1. please tell me the CTLE Gain value corresponding to this default value. (xxx dB at 4GHz/ yyy dB at 8GHz)

Q2. Without ANY register modification after power on, which value of CTLE Gain?

Best Regards,

  • 0
    TI__Mastermind 27922 points

    Hello,

    Please reference the "Reset" column of Table 23 in the Programming Guide. All of the EQ boost values are 0 by default. 

    This corresponds to a CTLE index of 0 in Table 8, as shown in the "Register Value" column.

    Therefore, the default CTLE gain value is -0.3dB at 4Ghz and -0.8dB at 8GHz.

    Thank you for your question. 

     

  • 0 in reply to David Creger
    Prodigy 40 points

    Thanks for your reply!

    but, in Table 8 of Programming Guide ... 

    - CTLE Index 0 (-0.3dB @ 4GHz / -0.8dB @ 8GHz) : 
      > the default value of reg_03 is 0x80. this is match with Table 8.
      > the default value of reg_04 is 0x16(value of bit 0 is '0').
         but in Table 8, the value of bit 0 in reg_04 is '1'.

    It does not match the default value and the setting value of CTLE Index 0,

    So, I think the Power-On-Default setting is not the same as CTLE Index 0.
    because bit 0 of reg_04 is related to [CTLE Stage 1 Bypass].

    Could you give me more details on this?

    Best Regards,

  • +1 in reply to MINHO BAEK
    TI__Guru* 93570 points

    Hi Minho,

    Device - in default mode with CTLE settings of 0 - has about 4-5dB residual gain. It would be a good idea to use IBIS-AMI model of the device to do overall signal integrity analyses for your application.

    Regards  ,, Nasser