Description

Solution

To properly enable the Digital Monitor, the following are the bit settings for GTX and GTH:

GTX Transceiver:

PCS_RSVD_ATTR[6] = 1'b1

DMONITOR_CFG[23:0]
[15] - Reserved. Set to 1'b1.
[14:1] - Reserved. Set to 14'h0080 (bit[8]=1'b1).
[0] - DMONITOR SELECT: Set to 1'b1 to monitor Digital Monitor signals, Set to 1'b0 when not monitoring

RX_DEBUG_CFG[11:0] = As per user guide (UG476 v1.9.1, Table 2-41) to select the adaptation loop to monitor

GTH Transceiver:

CFOK_CFG[41] = 1'b1

DMONITOR_CFG[23:0]
[15] - Reserved. Set to 1'b1.
[14:1] - Reserved. Set to 14'h0080 (bit[8]=1'b1).
[0] - DMONITOR SELECT: Set to 1'b1 to monitor Digital Monitor signals, Set to 1'b0 when not monitoring

RX_DEBUG_CFG[13:0] = As per user guide (UG476 v1.9.1, Table 2-41) to select the adaptation loop to monitor
RXCDR_CFG[81] = 1'b0

Note: In GTH PCIe Gen 3 mode when RXCDR_CFG[81] = 1'b1, the Digital Monitor cannot be used to monitor the adaptation loops.