9.7.5.3 REFCLK to Lanes Connectivity

The REFCLK of a quad can connect to all Lanes of the TXPLL (in addition to that which the REFCLK can connect), as well as all the other Lanes below it (including from different quads). Connection up the Cascade path is illegal.

Green arrows indicate legal connection and red arrows indicate illegal connection from the REFCLK to the Lanes.

Figure 9-29. REFCLK to Lanes Connection—Legal (Down the Cascade Path) and Illegal (Up the Cascade Path)