AHD_SPCHK_ENB_A
ahd->flags = AHD_SPCHK_ENB_A|AHD_RESET_BUS_A|AHD_TERM_ENB_A
sxfrctl1 |= (ahd->flags & AHD_SPCHK_ENB_A) != 0 ? ENSPCHK : 0;
ahd->flags &= ~AHD_SPCHK_ENB_A;
ahd->flags |= AHD_SPCHK_ENB_A;