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DS280DF810: Device Not Common Data Rate Config Question

Qiang Ren
Intellectual 2065 points
Part Number: DS280DF810

Tool/software:

Hello Team,

Currently my customer wants to set the DS280DF810 data rate to 27.34375G which isn't common data rate in the programming guide. We have bring up the device with common data rate setting to 25Gsps and working, based on that, we change the register as below to configure the 27.34375G:

0x60=0X5C, 0x61=0X44, 0x62=0X5C, 0x63=0X44

But the CDR is unlocked, signal is detected, 0x78 reads bit4=0 and bit5=1. So I want to double confirm with you if the only writes below are required to change the data rate of this device, or any other extra writes are needed to do? 

For next move in my side, I will try assert CDR reset and release CDR reset and see if the CDR is locked.

Thanks!

Regards,

Qiang

  • 0
    TI__Mastermind 19235 points

    Hi Qiang,

    My team will be getting back to you soon with our recommendations.

    Regards,

    HSSC Applications Manager

  • 0 in reply to Rodrigo Natal
    TI__Mastermind 27980 points

    Hi Qiang,

    Please make the following register writes, keeping in mind write masks. This procedure will configure the CDR for 27.34375 Gbps.

    • Address, Value, Mask, Comment
    • 0x60 0x5C 0xFF
    • 0x61 0xC4 0xFF // bit 7 needs to be enabled. This is an override bit to enable manual data rate selection.
    • 0x62 0x5C 0xFF
    • 0x63 0xC4 0xFF // bit 7 needs to be enabled. This is an override bit to enable manual data rate selection.
    • 0x64 0xFF 0xFF // set PPM tolerance to max
    • 0x09 0x04 0x04 // enable override for divider setting
    • 0x18 0x00 0x70 // force divide-by-1 setting
    • 0x0A 0x0C 0x0C // assert CDR reset
    • 0x0A 0x00 0x0C // release CDR reset

    Best,

    Lucas