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Float or tie to ground unused PCIE connections?

Question asked by chris_f on Jun 6, 2017
Latest reply on Jun 9, 2017 by gusarambula

IMX7DCEC page 18 (Table 3) says:

 

PCIE_VPH/PCIE_VPH_TX/PCIE_VPH_RX Short these pins to VDDA_PHY1P8 if using PCIe. User can leave these pins floating if not using PCIe.
PCIE_VP/PCIE_VP_TX/PCIE_VP_RX Short these pins to VDDD_1P0CAP if using PCIe. User can leave these pins floating if not using PCIe.

 

Page 20 (Table 5) however, says:

Recommendation if Unused:

PCIE_VP,PCIE_VP_RX,PCIE_VP_TX, PCIE_VPH,PCIE_VPH_RX,PCIE_VPH_TX, PCIE_REXT Tie to ground

 

 

Which is right? Leaving floating is clearly preferable from a routing point of view.

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