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DS320PR410: Redriver proximity to receiver

Steven Ray
Prodigy 10 points
Part Number: DS320PR410

Tool/software:

Hi,

When using a redriver (e.g. DS320PR410) in a PCIe design, are there any
limitations on how close (i.e. minimum distance) it may be to an endpoint?

In our instance, the output of the DS320PR410 feeds immediately (within
1 inch) into a PCIe switch (Microchip PM8536). Are there any concerns
with only 1 inch between the redriver output and the input of a PCIe switch?

Thanks,

Steve

  • 0
    TI__Mastermind 28050 points

    Hi Steve,

    There is no minimum distance recommendation between the Tx side of the redriver and the EP or RC receiver. DS320PR410 and other linear redrivers do not apply any Tx equalization, so a minimum distance requirement may be dependent on the minimum EQ setting of the receiver.

    There is a minimum distance recommendation between the Rx side of the redriver and the EP or RC transmitter. DS320PR410 has a minimum Rx CTLE setting of 4.5dB @ 16GHz, so the channel should have roughly at least 4.5dB of loss. If FR4 material is used, this is roughly 3.5in.

    These guidelines should only be used as a rule of thumb. The best way to determine if DS320PR410 will work well in a certain environment is to perform IBIS-AMI simulations. We have an IBIS-AMI model available in our secure resources folder. If you are interested, you can request access here.

    https://www.ti.com/secureresources/PCIE5-REDRIVERS-DESIGN

    Best,

    Lucas