The serial transceiver transceivers output clocks from both the receiver and
the transmitter called RXOUTCLK and TXOUTCLK.
RXOUTCLK is a word-rate recovered clock generated by the CDR in
the serial transceiver. TXOUTCLK is a word-rate clock generated by
the serial transceiver TX.
Typically, RXOUTCLK and TXOUTCLK are routed
through global clock buffers (BUFG). After being buffered by a BUFG the
RXOUTCLK drives the RXUSRCLK and
RXUSCRCLK2 ports of the serial transceiver and the rx_clk port of the SMPTE UHD-SDI core. Likewise, the
global version of TXOUTCLK drives the TXUSRCLK and
TXUSRCLK2 ports of the serial transceiver and the tx_clk port of the SMPTE UHD-SDI core.