DCC_CFG_SC_VL_TABLE_15_0
reg = read_csr(dd, DCC_CFG_SC_VL_TABLE_15_0);
write_csr(dd, DCC_CFG_SC_VL_TABLE_15_0,
write_csr(dd, DCC_CFG_SC_VL_TABLE_15_0, DC_SC_VL_VAL(