Xilinx Virtex UltraScale+ FPGAs - Page 30

GTM Transceiver TX Reset in Response to Completion
of Configuration
The TX reset sequence shown in TX Inializaon and Reset is not automacally started to follow
global GSR. It must meet these condions:
1. TXRESETMODE must be set to sequenal mode.
2. GTTXRESET must be used.
3. All TXPMARESETMASK and TXPCSRESETMASK bits should be set to High.
4. GTTXRESET cannot be driven Low unl the associated PLL is locked.
5. Ensure that GTPOWERGOOD is High before releasing PLLRESET and GTTXRESET.
If the reset mode is defaulted to single mode, then you must:
1. Wait another 300–500 ns.
2. Assert PLLRESET and GTTXRESET following the reset sequence described in the following
gure.
RECOMMENDED: Use the associated PLLLOCK from the PLL to release GTTXRESET from High to
Low as shown in the gure. The TX reset state machine waits when GTTXRESET is detected High and
starts the reset sequence unl GTTXRESET is released Low.
Figure 14: GTM Transmitter Initialization after Configuration
GTM Transceiver TX Reset in Response to GTTXRESET
Pulse in Full Sequential Reset
The GTM transceiver allows you to reset the enre TX completely at any me by sending
GTTXRESET an acve-High pulse. These condions must be met when using GTTXRESET:
1. TXRESETMODE must be set to sequenal mode.
2. All TXPMARESETMASK and TXPCSRESETMASK bits should be held High during the reset
sequence before TXRESETDONE is detected High.
Chapter 2: Shared Features
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 30
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