Details

The die supports 4 pairs of PCIe Refclk output pads, PCIE_REFCLK[3:0]. However, the package only supports one output, PCIE_REFCLK1. The PCIE_REFCLK3 pads are incorrectly connected to the PCIE_REFCLK1_P/N_OUT package pins instead of the PCIE_REFCLK1 pads.

Workaround

Enable the PCIE_REFCLK1_P/N_OUT pins and select the desired source by setting the PCIE_REFCLK3_CLKSEL register instead of the PCIE_REFCLK1_CLKSEL register.

This will be fixed as a rolling change to the package substrate. The package will be modified to connect the die PCIE_REFCLK1 pads to the package PCIE_REFCLK1_P/N_OUT output pins.

Software can future proof for this change by setting both the PCIE_REFCLK1_CLKSEL and PCIE_REFCLK3_CLKSEL registers. Production software on the updated package should only set PCIE_REFCLK1_CLKSEL.