RMAC_ADDR_DATA0_MEM
PIF_WCSR(RMAC_ADDR_DATA0_MEM, val << 16);
PIF_WCSR(RMAC_ADDR_DATA0_MEM, 0xffffffffffff0000ULL);
PIF_WCSR(RMAC_ADDR_DATA0_MEM, 0x8000000000000000ULL);
val = PIF_RCSR(RMAC_ADDR_DATA0_MEM);