DataWord is the 4-bit data seed field that supplies the background data for the test algorithm at instruction load.
In the Go/No-Go algorithm, the Read Write Read March (y-fast) and Bang algorithms do not use the data seed value. Table 3.2 shows the data that the Go/No-Go algorithm uses.
The data seed enables you to select values stored into arrays for IDDQ ATPG, or to select data words to search for unexpected sensitivities during march or bit-line stress tests. The MBIST engine replicates the four bits of data 16 times to give the full 64 bits of data required on the MBISTDIN[63:0] port of the MBIST interface.