AHC_DT            235 dev/ic/aic7xxxvar.h AHC_DT		= 0x00800,	/* Double Transition transfers */
AHC_DT            269 dev/ic/aic7xxxvar.h AHC_AIC7892_FE	= AHC_AIC7890_FE|AHC_DT|AHC_AUTORATE|AHC_AUTOPAUSE,