IDMA on MPC82xx

[john ke]

Any one who has any experience when using IDMA on mpc82xx? 
Currently, the status what I have got is, memory-to-memory mode, both Data bus had been set to 60x-bus,which means DDTB and SDTB are working on 60x-bus. if set DMA_WRAP in DCM as 64-byte, SS_MAX,STS and DTS in (IDMA Parameter RAM) all to 32 Bytes, there woking good!
But if set DMA_WRAP more than 64-byte(i.e 256-bytes)  ,SS_MAX,STS and DTS in (IDMA Parameter RAM) all to 7*32 Bytes when WRAP = 256 . then got some issues:
1.some bytes in a packet had been changed oddly. for example if  some bytes in the packet is "20 0f 17 2c...." after 
IDMA transmission , the bytes will be changed as "20 1d 17 2c", there is a slightly different with "17" and "1d".
2. some bytes had been swapped , for example "20 0f 17 2c" , after transmission , the bytes in packet was "2c 17 0f 20".
any ideas?
 
 
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