Extend TXT Buffer and RX Buffer RAMs
Right now, read is executed every clock cycle from these RAMs. This is not desirable and "CE" or "RE" signal shall be added.
Thisway, RAM will load data only when CE is high and keep previous data on its output. This needs to be added to TXT Buffer RAM and RX Buffer RAM. Inferred RAM wrapper must be extended by these signals. CE signals shall be separate for each port.