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C5505 MIPS

Michael Steen Jensen
Prodigy 50 points

I have an algorithm that at 56MIPS should have an execution time of around 24uS.

But with a C5505 @120Mhz it takes 44-50us - with >=120MIPS I would have expected 12us or so.

The code is running in SARAM, parameters/data is placed in DARAM.

Using CLK_OUT it was verified that the DSP is in fact running at 120Mhz. In the test setup , all
interrupts DMA's + I2S's  are disabled , and an I/O port used for the actual measurement. No DSP/BIOS is used, its
just a simple loop calling the algorithm. Code is loaded using CCS and a XDS100 interface.

Any idea's why I dont see the expected performance ?

- other than the specified execution time for the algorithm being wrong.