U21_DESC
SIG_EXPR_DECL_SINGLE(ROMD4, ROM8, U21_DESC, VPOOFF0_DESC);
SIG_EXPR_DECL_SINGLE(ROMD4, ROM16, U21_DESC, VPOOFF0_DESC);
SIG_EXPR_DECL_SINGLE(ROMD4, ROM16S, U21_DESC, VPOOFF0_DESC);
SIG_EXPR_DECL_SINGLE(VPODE, VPO12, U21_DESC, VPO12_DESC);
SIG_EXPR_DECL_SINGLE(VPODE, VPO24, U21_DESC, VPO12_DESC);
SIG_EXPR_DECL_SINGLE(VPOG6, VPO, U21_DESC, VPO_DESC, CRT_DVO_ES_DESC);
SIG_EXPR_DECL_SINGLE(VPOG6, VPOOFF1, U21_DESC, VPOOFF1_DESC, CRT_DVO_ES_DESC);
SIG_EXPR_DECL_SINGLE(VPOG6, VPOOFF2, U21_DESC, VPOOFF2_DESC, CRT_DVO_ES_DESC);