ASC_IOP_REG_AX   1293 dev/ic/advlib.h #define ASC_READ_CHIP_AX(iot, ioh)				bus_space_read_2((iot), (ioh), ASC_IOP_REG_AX)
ASC_IOP_REG_AX   1294 dev/ic/advlib.h #define ASC_WRITE_CHIP_AX(iot, ioh, data)			bus_space_write_2((iot), (ioh), ASC_IOP_REG_AX, data)