Why is the tx_ready_err CSR register bit flagged after the JESD204C Intel® FPGA IP is reset in the Intel® Stratix® 10 devices?

Description

After the JESD204C Intel® FPGA IP link is up in Intel®  Stratix® 10 devices, if there is a warm reset applied to the IP, an unexpected tx_ready_err CSR register bit might be flagged right after the IP is reset.

This is due to the transceiver getting reset and tx_ready being deasserted after the mgmt_clk (avs_clk domain) is out of reset.

Resolution

To work around this problem do either of the following:

1. Clear the error interrupt.
2. To avoid the interrupt, prolong the mgmt_clk (avs clk domain) reset when there is an IP reset to avoid errors being flagged during the reset period. 

This problem is fixed starting from the Intel® Quartus® Prime Pro Edition Software version 19.3.