Xilinx 7 Series User Manual page 59

Table 2-22: Recommended Resets for Common Situations (Cont'd)
Situation
After remote power up
Electrical idle
(2)
After connecting RXN/RXP
After recovered clock becomes stable
After an RXBUFFER error
After changing channel bonding mode on the
fly
After PRBS error
After comma realignment
After entering or exiting Far-End PMA
loopback
After entering or exiting Near-End PMA
loopback
Notes:
1. The recommended reset has the smallest impact on the other components of the GTP transceiver.
2. It is assumed that RXN/RXP are connected simultaneously.
After Power-up and Configuration
The entire GTP RX requires a reset after configuration. See
to Completion of Configuration
After Turning on a Reference Clock to the PLL Being Used
If the reference clock(s) changes or GTP transceiver(s) are powered up after configuration,
GTRXRESET should be toggled after the PLL fully completes its reset procedure.
After Changing the Reference Clock to the PLL Being Used
Whenever the reference clock input to the PLL is changed, the PLL must be reset afterwards to
ensure that it locks to the new frequency. The GTRXRESET should be toggled after the PLL fully
completes its reset procedure.
After Assertion/Deassertion of PLL[0/1]PD, for the PLL Being Used
When the PLL being used goes back to normal operation after power down, the PLL must be reset.
The GTRXRESET should be toggled after the PLL fully completes its reset procedure.
After Assertion/Deassertion of RXPD[1:0]
After the RXPD signal is deasserted, GTRXRESET must be toggled.
7 Series FPGAs GTP Transceivers User Guide
UG482 (v1.9) December 19, 2016
Components to
be Reset
Entire RX GTRXRESET
Entire RX Handled automatically with appropriate attribute
settings
Entire RX GTRXRESET
RX Elastic Buffer RXBUFRESET
RX Elastic Buffer RXBUFRESET
RX Elastic Buffer RX elastic buffer is reset automatically after change in
channel bonding mode by setting
RXBUF_RESET_ON_CB_CHANGE to TRUE
PRBS Error PRBSCNTRESET
Counter
RX Elastic Buffer RX elastic buffer is reset automatically after comma
(optional) realignment by setting
RXBUF_RESET_ON_COMMAALIGN to TRUE
Entire TX GTTXRESET
Entire RX GTRXRESET
for procedure.
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Reset and Initialization
(1)
Recommended Reset
GTP Transceiver RX Reset in Response
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