register_fail:AMBA:AXI3:signal_valid_rdata_when_rvalid_high_check] Description: Monitor Check for X or Z on RDATA when RVALID is high

This error message indicates that there is a monitor check failure in the AXI3 protocol. Specifically, the check is for the RDATA signal when the RVALID signal is high. The monitor has detected that the RDATA signal contains X (unknown) or Z (high-impedance) values when it should not.

This error can occur due to various reasons such as a timing violation, a data corruption issue, or a design bug. To resolve the issue, you should carefully review the design and simulation results to identify the root cause of the problem. You may also need to consult the AXI3 protocol specification to ensure that the design adheres to the standard.

Once you have identified the cause of the issue, you can take appropriate measures to fix it. This may involve modifying the design, adjusting timing constraints, or adding error correction mechanisms. It is important to thoroughly test the design after making any changes to ensure that the issue has been resolved.