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C6670 AIF2 test transfer data error



I am testing AIF2 on C6670 EVM,  but I got some error when I transfer data on it.

The environment is: AIF2 LOOPBACK,  CPRI 15 bit I + 15 bit Q,  LTE 20M HZ, 4X, 2AxC   , I test this on all of the lte cpri test project on aif2/test projects, but the result is the same: 

when using the project to test some regular data , it is all right, send 0x00000001 recv same, send 0xffffffff recv same, but when I send  0x88888888 recv 0xC000C000, send 0x8fff8ffff recv 0xC000C000, what's wrong whit it..., I can't find any explanation.

And where can I find the internal 16 bit data change to outside 15bit data, which bit is nonuse? send 0xffffffff recv 0xffffffff, every bit seems transfered and recvd.

Waiting for your advices, thank you .