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TMS320C5505: DSP library FIR() cycles

Part Number: TMS320C5505

Hi Guys,

Am using ezDSPVC5505 USB Stick.

Am trying to use the DSP LIB function FIR( ). 

Number of input samples : 2

Number of coeff : 65

When my API is run and cycles measured, it taked around 418 cycles which is high.

As per the DSP Lib ref guide, the number of cycles should be approximately 160.

I downloaded DSP library and if i run the example code, it takes 177 cycles.

Why there is a difference. I have placed all my data in DARAM which is a requirement of the library.

Kindly let me know what could be reason/issue??.

Thanks and Regards

Ramprasad