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SN75LVCP600S: When to use a redriver on SATA

designer01
Prodigy 160 points
Part Number: SN75LVCP600S

Hi there... I'm using the same SATA circuit in a new design as I did on an older design that was fully functional.  However, the new hardware attached to the SATA port is not being recognized.  I'm wondering if I need a redriver.  Question is, when do I need to use a redriver such as the LVCP600S?

  • 0
    TI__Mastermind 43795 points

    Hi,

    Redrivers are used on high speed interfaces when the interconnect or channel attenuation approaches or exceeds the maximum value specified in the standard.  For an interface like PCIe the maximum is ~ 20 dB @ 4GHz for a Gen3 channel.  For SATA the meaningful specification is probably a receiver eye mask.  High levels of attenuation will make it impossible for a SATA transmitter to meet the eye mask at the receiver.  In this case adding a redriver is a relatively easy solution to help compensate for the channel loss and clean up the receiver eye opening.

    Regards,

    Lee 

  • 0 in reply to Lee Sledjeski
    TI__Mastermind 43795 points

    Typically whan a SATA port is not recognized there is a problem with OOB signaling.  I would recommend to put a scope on the interface and see if the OOB signaling looks clean or if there is something out of specification with the waveforms.

    Regards,

    Lee