AB1_DESC
SIG_EXPR_DECL_SINGLE(VPIG3, VPI18, VPI18_DESC, AB1_DESC);
SIG_EXPR_DECL_SINGLE(VPIG3, VPI24, VPI24_DESC, AB1_DESC);
SIG_EXPR_DECL_SINGLE(VPIG3, VPI30, VPI30_DESC, AB1_DESC);
SIG_EXPR_LIST_DECL_SINGLE(AB1, PWM3, PWM3, AB1_DESC);