Lattice Semiconductor CertusPro-NX - Table of Contents

CertusPro-NX SerDes/PCS Usage Guide
Preliminary Technical Note
FPGA-TN-02245-0.81 © 2020-2021 Lattice Semiconductor 3
All rights reserved. CONFIDENTIAL
Contents
Glossary .............................................................................................................................................................................. 11
Introduction ................................................................................................................................................................ 14
Features ...................................................................................................................................................................... 15
Using This Technical Note ........................................................................................................................................... 16
Standards Supported .................................................................................................................................................. 17
Architecture Overview ................................................................................................................................................ 18
Device Architecture ........................................................................................................................................... 18
SerDes/PCS Architecture ................................................................................................................................... 19
PCI Express Architecture ................................................................................................................................... 20
MPCS Architecture ............................................................................................................................................ 22
Reference Clock Architecture ............................................................................................................................ 24
Multi-Protocol Design Consideration ................................................................................................................ 25
SerDes/PCS Block Signal Interface .................................................................................................................... 25
Detailed Interface Descriptions ......................................................................................................................... 27
Control and Status Signals ................................................................................................................................. 43
Detailed Channel Block Diagram ....................................................................................................................... 44
SerDes/PCS Function Description ............................................................................................................................... 47
SerDes (PMA) .................................................................................................................................................... 47
PMA Controller .................................................................................................................................................. 49
PCI Express PCS ................................................................................................................................................. 49
MPCS ................................................................................................................................................................. 50
Quad Common .................................................................................................................................................. 70
Reference Clock ................................................................................................................................................. 70
Clocks and Reset ......................................................................................................................................................... 72
MPCS Channel Clock Detail ............................................................................................................................... 72
MPCS Quad Clock Detail .................................................................................................................................... 76
MPCS Quad-to-Quad Clock Connection ............................................................................................................ 77
Clock Frequency ................................................................................................................................................ 78
Application Case ................................................................................................................................................ 79
PMA Clock Divider ............................................................................................................................................. 85
SerDes/PCS Reset .............................................................................................................................................. 85
SerDes Equalization .................................................................................................................................................... 89
Tx Equalization .................................................................................................................................................. 90
Rx Equalization .................................................................................................................................................. 92
SerDes/PCS Debug Capabilities .................................................................................................................................. 93
Loopback Mode ................................................................................................................................................. 93
Signal Detector .................................................................................................................................................. 95
Loss of Lock ....................................................................................................................................................... 96
ECO Editor ......................................................................................................................................................... 97
Eye Monitor ....................................................................................................................................................... 97
SerDes/PCS Register Access .................................................................................................................................... 98
Register Access Bus ........................................................................................................................................... 98
Register Space ................................................................................................................................................... 99
Protocol Mode ...................................................................................................................................................... 100
PCI Express Mode ............................................................................................................................................ 100
Generic 8B/10B Mode ..................................................................................................................................... 100
PMA Only Mode .............................................................................................................................................. 101
Ethernet Mode ................................................................................................................................................ 101
SLVS-EC Mode ................................................................................................................................................. 103
DisplayPort Mode ............................................................................................................................................ 104
CoaXPress Mode ............................................................................................................................................. 104
SerDes/PCS Block Latency..................................................................................................................................... 105