The ECC Fault Injection registers, FI_D and FI_ECC, facilitates testing of the software drivers. When set, the ECC Fault Injection register XORs with the DDR4 SDRAM datapath to simulate errors in the memory. It is ideal for injection to occur here because this is after the encoding has been completed. There is only support to insert errors on the first data beat, therefore there are two to four FI_D registers to accommodate this. During operation, after the error has been inserted into the datapath, the register clears itself.