RAC_CPU_SHIFT
enable |= (RAC_DATA_INST_EN_MASK << (cpu * RAC_CPU_SHIFT));
en_mask |= ((1 << RACPREFDATA_SHIFT) << (cpu * RAC_CPU_SHIFT));
shift = cpu * RAC_CPU_SHIFT + RACPREFDATA_SHIFT;
enable |= RAC_DATA_INST_EN_MASK << (cpu * RAC_CPU_SHIFT);