Xilinx Virtex UltraScale+ FPGAs

Figure 45: RX Data Received
RXUSRCLK and RXUSRCLK2 Generation
The RX interface includes two parallel clocks: RXUSRCLK and RXUSRCLK2. RXUSRCLK is the
internal clock for the PCS logic in the GTM transmier. The required rate for RXUSRCLK
depends on the internal datapath width of the GTM_DUAL primive and the RX line rate of the
GTM transmier. The following equaon shows how to calculate the required rate for
RXUSRCLK for all cases.
RXUSRCLK Rate =
Line Rate
Internal Datapath Width
Chapter 4: Receiver
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 114
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