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DS110DF111- CDR Bypass mode for STM1, STM4

Mahesh KC03
Intellectual 1360 points

Hello,

One of my customer is using this retimer for his front port optical application. The data baud rate is OC-192(9.95G) mainly. The device also needs to support STM1- 155.52 Mbps and STM4- 622 Mbps for which the CDR bypass mode is sufficient.

To put the device in CDR bypass, 

0x09[5] = 1'b to over ride the setting

0x1E[7:5] = 000'b to set it to raw data.

Is there any other register write needed to ensure the raw mode? Does the VCO rate/subrate register need to be configured to the corresponding rate(STM-64 = 9.953G) to operate in bypass?

  • 0
    TI__Mastermind 43795 points

    Hi Mahesh,

    In addition you should disable the Lock Monitoring, SBT, PPM, and  FLD checks in the registers

    Add register writes

    0x0C[3] = 0'b to disable SBT

    0x2F[2] = 0'b to disable PPM

    0x2F[1] = 0'b to disable FLD

    0x3E[7] = 0'b to disable Lock monitoring

    I would program the VCO rate/subrate to = STM-64 (9.953G) so only the above registers would need to be re-programmed for the higher datarate.

    Regards,

    Lee