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DS250DF230: invert the output signal

Okutsu
Prodigy 180 points
Part Number: DS250DF230

Hi. I have a question.

If I want to invert the signal, the bit to change the setting are

Add : 0x3D[6], 0x3E[6], 0x3F[6]

Bit name : FIR_C0_SGN, FIR_CN1_SGN, FIR_CP1_SGN

 

Is the above correct?
Also, please tell me how to change the settings in that case.

  • +1
    TI__Mastermind 19235 points

    That is correct. See routine below taken from the TI retimer programming guide.

    6.10   Invert Output Data Polarity

     Invert the polarity of the output data.

    Table 28. Invert the Polarity of the Output Data

    STEP

    SHARED/ CHANNEL REGISTER SET

    OPERATION

    REGISTER ADDRESS [HEX]

    REGISTER VALUE [HEX]

    WRITE MASK [HEX]

    COMMENT

    1

    Channel

    Write

    3D

    80

    80

    Enable FIR

    2

    Channel

    Read

    3D

     

     

    Read main-cursor polarity (bit

    6)

    3

    Channel

    Read

    3E

     

     

    Read pre-cursor polarity (bit

    6)

    4

    Channel

    Read

    3F

     

     

    Read post-cursor polarity (bit

    6)

    5

    Channel

    Write

    3D

    Invert bit 6 from step 1

    40

    Invert the polarity bit for the main-cursor

    6

    Channel

    Write

    3E

    Invert bit 6 from step 2

    40

    Invert the polarity bit for the pre-cursor

    7

    Channel

    Write

    3F

    Invert bit 6 from step 3

    40

    Invert the polarity bit for the post-cursor