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Original question:

DS250DF810: Approx. Post de-emphasis question

DS250DF810: DS250DF810 test tool and the related guider

Oliver Ou
Intellectual 2845 points
Part Number: DS250DF810

Hi, 

In customer's system, DS250DF810 supports 100G-CR4 which follows IEEE802.3bj, in which it defines test requirement as listed below.  Could you provide tool and the related guide on how to implement the request as listed below? Thanks a lot. 

TX disable

PRBS9

Request transmitter to be set to 'PRESET' condition

Abs Coefficient Step Size c(1) inc c(0) hold c(-1) hold

Abs Coefficient Step Size c(1) dec c(0) hold c(-1) hold

Abs Coefficient Step Size c(1) hold c(0) inc c(-1) hold

Abs Coefficient Step Size c(1) hold c(0) dec c(-1) hold

Abs Coefficient Step Size c(1) hold c(0) hold c(-1) inc

Abs Coefficient Step Size c(1) hold c(0) hold c(-1) dec

set to c(1) zero c(0) minimum and c(-1) minimum

set to c(1) minimum c(0) minimum and c(-1) zero

Oliver Ou

  • 0
    TI__Mastermind 19235 points

    Hi Oliver,

    The DS250DF810 retimer does not implement state machine logic required to handle the IEEE link training function. The local host may instead manually set the retimer Tx FIR main, pre-cursor and post-cursor tap settings via I2C writes to retimer channel registers 0x3D through 0x3F. You may refer to the TI retimer programming guide for more details related to retimer channel registers. You can request access to technical documents such as the retimer programming guide via the TI.com product page.

    www.ti.com/.../DS250DF810

    Cordially,

    Rodrigo Natal

    HSSC Applications Engineer

  • 0 in reply to Rodrigo Natal
    TI__Guru* 93670 points
    Hi Oliver,
    Thanks to Rodrigo, he provided feedback on this three days ago. We are going to close this case and please either reopen or open a new case - if there is an update or a new question.
    Regards,,,nasser