GTS Transceiver PHY User Guide

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

2.2.3. Unused PMA Rules

To save power, you can power down unused GTS transceiver banks that you do not plan to use in the future. Connect the PMA power supplies (VCCEHT_GTS and VCCERT_GTS) of the unused banks to ground to power them down and use the PRESERVE_UNUSED_XCVR .qsf assignment. This is supported in the following scenarios:
  1. All GTS transceiver banks on the same side are unused. You may ground all the transceiver PMA bank supplies on the unused side.
  2. Some GTS transceiver banks on one side are unused. Depending on devices, only some banks support power down. Refer to Selected E-Series GTS Transceiver Banks that Support Power Down and Selected D-Series GTS Transceiver Banks that Support Power Down for the specific banks that can support power down in this scenario for you to ground the unused PMA bank power supplies.
Table 5.  Selected E-Series GTS Transceiver Banks that Support Power Down
Device 11 GTS Transceiver Banks that Support Power Down 12
B32A Package B23A Package M16A Package 13
A5E 028 1A 1A 14
A5E 043 1B 14
A5E 052 1A, 4A, or both 1B 14
A5E 065 1A, 4A, or both 1B 14
Table 6.  Selected D-Series GTS Transceiver Banks that Support Power Down
Device GTS Transceiver Banks that Support Power Down12
B32B Package B23D Package
A5D 010 1A, 4A, or both 1A
A5D 025 1A, 4A, or both 1A
A5D 031 1A, 4A, or both 1A
A5D 051 1A and 1B 14
A5D 064 1A and 1B, 4A and 4B, or all 1A, 1B, 4A and 4B 14
Apply the following .qsf assignment to the specific GTS transceiver bank that you want to power down:
set_instance_assignment -name PRESERVE_UNUSED_XCVR_CHANNEL OFF -to <pinname>
where <pinname> is the pinout location of any transceiver channel in the corresponding bank that you want to power down.
For example:
set_instance_assignment -name PRESERVE_UNUSED_XCVR_CHANNEL OFF -to BY129
Using A5E 065B F32A device as an example, the GTS transceiver bank 1A, where the BY129 pin resides, is set to power down.
You must preserve currently unused PMA channels that you plan to use in the future as described in the table below.
Table 7.  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 Intel FPGA 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 is disconnected during operation, hold the TX and RX PMA channels in reset before disconnecting the reference clock.
11 A5E 008 and A5E 013 devices have only 1 GTS transceiver bank, which is on the left side. If unused, you can power them down.
12 If all GTS transceiver banks on the same side are unused, you can power them down.
13 Device group B only.
14 No package combination for this device.