ISP_SPRIV_TACTIVE
#define XS_S_TACTIVE(sccb) (sccb)->ccb_h.spriv_field0 |= ISP_SPRIV_TACTIVE
#define XS_C_TACTIVE(sccb) (sccb)->ccb_h.spriv_field0 &= ~ISP_SPRIV_TACTIVE
#define XS_TACTIVE_P(sccb) ((sccb)->ccb_h.spriv_field0 & ISP_SPRIV_TACTIVE)