SINGLE_EDGE      1178 dev/ic/aic7xxx.c 					       (scsirate & SINGLE_EDGE)
SINGLE_EDGE      2015 dev/ic/aic7xxx.c 			scsirate &= ~(SXFR_ULTRA2|SINGLE_EDGE|ENABLE_CRC);
SINGLE_EDGE      2021 dev/ic/aic7xxx.c 					scsirate |= SINGLE_EDGE;