RX Equalization (for 32 bit PMA only)

You use the RX equalization evaluation interface to update the far-end transmitter’s de-emphasis settings.

The PMA_RX_EQ_EVAL input starts the evaluation. When evaluation completes, the PMA_RX_EQ_EVAL_COMPLETE and PMA_RX_LINK_EVAL_FB_DIR_CHANGE output signals are valid upon assertion of PMA_RX_EQ_EVAL_STATUS. The PMA_RX_LINK_EVAL_FB_DIR_CHANGE signal provides the evaluation result.

During evaluation, you can de-assert PMA_RX_EQ_TRAINING_DATA_VALID if you do not want the incoming RX serial data to be used for the evaluation. For system power up, inialitize PMA_RX_EQ_TRAINING_DATA_VALID to 1’b1.

Do not assert PMA_RX_EQ_EVAL while RX_EQ_EVAL_STATUS is asserted. After asserting PMA_RX_EQ_EVAL, do not de-asserted it until PMA_RX_EQ_EVAL_STATUS has been asserted.