3.1.9. TX PMA Bonding
Enable bonding by selecting the Enable TX PMA bonding option in the TX PMA tab of the Native PHY IP GUI. You can only bond channels within the same transceiver tile (24 channels). The transceiver Native PHY IP core does not support reconfiguration between bonded and non-bonded channel configurations.
The Native PHY IP core restricts the maximum number of channels to 24 for bonded configuration and provides an information message to notify you of the restriction. The fitter enforces the placement restriction to make sure all the bonded channels yield a valid placement.
TX PMA bonded channels must be placed contiguously from the bottom to the top. Use the E-Tile Channel Placement Tool for your channel placement.
When you enable TX PMA bonding, the maximum channel-to-channel skew is 2 UI + 125 ps.
There are two mechanisms by which to facilitate bonding:
- Transceiver interface deskew logic
- Dedicated balanced transceiver reference clock tree
Once you enable bonding in the Native PHY IP core, both of these bonding mechanisms are activated.
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