RTASE_MITI_COUNT_BIT_NUM
time_unit = msb - RTASE_MITI_COUNT_BIT_NUM;
time_count = time_us >> (msb - RTASE_MITI_COUNT_BIT_NUM);
if (msb >= RTASE_MITI_COUNT_BIT_NUM) {
pkt_num_unit = msb - RTASE_MITI_COUNT_BIT_NUM;
RTASE_MITI_COUNT_BIT_NUM);