ECC protected TXT/RX buffers
Consider adding memory protection to TXT buffer and RX buffers. Such option could implement either simple parity, or more complex ECC. An extra bit/bits could be stored for each word. During read, the value read from RAM would be checked towards ECC value. In case of mis-match, Interrupt could be fired.
Verification of this feature would require "force/release" with combination of external names (or modifying content of memory via test access).
In case of mis-match, a flag could be set, or an interrupt could be fired.
This option could be present as synthesis option ("sup_ram_ecc").
It is questionable how to implement this option. Adding a single bit, could be implemented in flop array, if more protection bits are added, additional RAM could be considered.