can asyn and iso transmit datas in the same cycle with tsb12lv32 and tsb41ab3?

Good morning,thank you for your ever help about my questiones. now we are puzzeled again,can't find a way.Would you like to do me a favor ? we use tsb12lv32 and tsb41ab3,one node is configured to send 128 isochronus packages per block by DM port and send asynchronus response package through ATF.sometime the transmission is normal.but before the node finishes sending 128 iso package,it receives one asyn request package,after it finishes sending asyn response package by atf,the traffic of iso is resumed but it only send less than 128 iso package. then tsb12lv32's terminal dmdone is forever low.it can't send iso unless power off and then power on. in my opinion ,in one 125us cycle ,it sends iso fistly and then transmits asyn. it should not conflict iso and asyn.why not? some CFR registers is set as follows: 04h:08030024; 08h:d6741a08; 38h:00400a0 can you give me some sugguesions. look forward to your reply soonly.:)