GTS Transceiver PHY User Guide: Agilex™ 3 FPGAs and SoCs

ID 848344
Date 8/04/2025
Public
Document Table of Contents

2.2.3.2. Unused PMA Planned for Use in the Future

You must preserve currently unused PMA channels that you plan to use in the future as described in the table below.
Table 5.  Steps to Preserve Unused PMA Channels
Unused PMA Channel Scenario Steps to Preserve PMA Channel
Unused GTS transceiver bank Do not power down the bank. Connect PMA power supply to GTS transceiver bank.
Unused PMA channel not instantiated in design No action required as channels are preserved by default.
Unused PMA channel instantiated in design Hold TX and RX PMA in reset by asserting the i_tx_reset and i_rx_reset ports of the GTS PMA/FEC Direct PHY IP.
For TX PMA channels in operation, ensure that the data pattern is toggling. Do not send data patterns consisting of all zeros or all ones. If the reference clock becomes absent during operation, the TX and RX PMA channels must be held in reset.