Xilinx Virtex UltraScale+ FPGAs - Chapter 3: Transmitter

Chapter 3
Transmitter
This chapter shows how to congure and use each of the funconal blocks inside the transmier
(TX). Each transceiver includes an independent transmier, which consist of a PCS and a PMA.
The following gure shows the funconal blocks of the transmier. Parallel data ows from the
device logic into the TX interface through the PCS and PMA, and then out the TX driver as high-
speed serial data.
Figure 24: GTM Transceiver TX Block Diagram
Pattern
Generator
Polarity
FIFO
To RX Parallel
Data (Near-End
PCS Loopback)
From RX Parallel
Data (Far-End
PCS Loopback)
TX
Interface
FEC
Gray
Encoder
Pre-
Coder
TX PCS
PIS
O
TX
Driver
TX
Pre/
Pre2/
Post
Emp
TX PMA
X20910-052818
The key elements within the GTM transceiver TX are:
1. TX Interface
2. TX FEC
3. TX Buer
4. TX Paern Generator
5. TX Polarity Control
6. TX Gray Encoder
7. TX Pre-Coder
8. TX Fabric Clock Output Control
9. TX Congurable Driver
Chapter 3: Transmitter
UG581 (v1.0) January 4, 2019 www.xilinx.com
Virtex UltraScale+ GTM Transceivers 54
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