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question about srio message transfer

hi, all:
we designed a board with 2 6678, both of them connect to xilinx v6 by SRIO, it is like
the following:
                               DSP A <-> v6 <-> DSP B
DSP A send message (type11) to v6, then v6 send the received message to DSP B.
When data payload is small which can fit into one packet (256 bytes), v6 can forward
the data normally. But when the payload is large ( e.g. 300) which broken into 2 
segments, DSP B can't receive the correct data. When the data is received by DSP B,
the RXU should assembles 2 segments into one message and push it upto user.
In our case, the 2 segments turn into 2 messages, the 1st message's descriptor is OK, but
the CC (completion code) of the 2nd message is 10 which means Error, TimeOut on receiving
one of the segments. We can't figure out what can cause this error.
Can someone give advice? Thanks.