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DS160PR412: AC-coupling

Part Number: DS160PR412
Other Parts Discussed in Thread: DS160PR421,

Hi 

The PCIE switching method is as shown in the figure below, two PCIEs share a slot Customers have the following questions about DS160PR412 & S160PR421

1. Does the RX AC-coupling red frame of PR421 still need capacitors?

2. For DS160PR412, the TX is placed close to the SLOT, so is DS160PR421 the same in the SLOT or close to the CPU 3. Are there two LAYOUT Guides?

  • Hi Gareth,

    1). Yes it does. Typically in PCIe applications these AC coupling Caps are integrated within the TX driving PCIe slot A. So you may not need these Caps since they are already integrated in the PCIe device that is plugged into the X8 PCIE SLOT in your first diagram.

    2). Typically PR412 is placed closed to the CPU such that all the media loss is on the input of the PR412 device.

    Regards ,, Nasser

  • Hi Nasser

    About Equalization Control Settings PR421/ PR412(Table7-1) and DS160PR412-421EVM Evaluation Module(Table2-4) have different values, which one is correct

  • Hi Gareth,

    You may have an old revision of the data sheet. The latest revision - March 2020 table 3 - shows EQs same as what you have in EVM table 2-4. So please use table 2-4 of the EVM.

    Regards ,, Nasser