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REFCLK FLEXIO Assignment for CopprLink External

ECN Affected Document
CopprLink External Cable Spec for PCIe 5.0 and 6.0 Version 1.0
Date
09/10/2025
Technology
Group
Specification Type
  • Move REFCLK from FLEXIO3_RC/FLEXIO4_RC/FLEXIO3_NRC/FLEXIO4_NRC to FLEXIO1_RC/FLEXIO2_RC/FLEXIO1_NRC/FLEXIO2_NRC to match the signal direction of the optional PCIe x1 Tx/Rx direction on x4 and x8 connectors and ensure that REFCLK Tx is placed on the same board as PCIe Tx for other lanes.
  • Update the CMIS description fields for FLEXIO to clarify signal directions and maximum speeds. 
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