GTS Transceiver PHY User Guide

ID 817660
Date 7/08/2024
Public
Document Table of Contents

2.6.2. Datapath Clock Network

There are 2 datapath clocking modes, the system PLL clocking mode and the PMA clocking mode.
For the system PLL clocking mode, where the datapath is clocked by the system PLL:
  • The system PLL clocking mode must be used for PCIe, Ethernet, PCS direct and FEC direct modes.
  • The PMA direct mode can also be clocked by system PLL.
  • System PLL clocking must be used for dynamic reconfiguration.
Figure 25. System PLL Clocking Mode
For the PMA clocking mode, which can only be used for PMA direct mode:
  • TX datapath is clocked by the TX PLL
  • RX datapath is clocked by the CDR
Figure 26. PMA Clocking Mode
Refer to Supported PMA Data Widths and Date Rates for supported data rates.