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CCS/TMS320C6670: What is the computional formula of SSL submodule of BCP in c6670 DSP?

Part Number: TMS320C6670

Tool/software: Code Composer Studio

Recently, I am using the SSL submodule of BCP to do soft-demodulation.  The input data format of SSL is based on WiMax standard. According to the UG of BCP, SSL outputs the LLR soft bits. As we know, the LLR compuational formula is log(sum(exp(-(r-s0).^2)/-SIGMA2)/sum(exp(-(r-s1).^2)/-SIGMA2)), so with the aid of Matlab, the LLR can be reached, but unfortunately, the result is inconsistent with output of SSL submodule (even if consider the quantization effect of SSL). Can anybody tell me where the problem is?  What is the computional formula of SSL? Thank you very much!