Honored Contributor
Honored ContributorWhen I configure the device the GXB_TX11 SMA connector has a jittery 50 MHz clock output. Then when I choose a PRBS sequence and hit Start in the Transceiver Toolkit to control the Tx channel the output shows PRBS data, but it's also just as slow (instead of the 6.4453 Gbps it's supposed to be), and there's occasional "bursts" of voltage on the scope.
In the Transceiver Toolkit the TX/CMU PLL status and RX CDR PLL status both show 'PLL not locked'. The TCL console command alt_xcvr_custom_is_tx_pll_locked returns 0. In SignalTap the pll_locked signal (which the handbook refers to as 'A high on this signal indicates that the TX PLL is locked') is always 0. So the transmitter is transmitting something, even if it's not what I expect, and the PLL is not locked.
