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Performance comparison for FIR accelerator between 214xx and 215xx

Question asked by Hfuhrhurr on Jan 29, 2018
Latest reply on Apr 9, 2018 by Jithul_Janardhanan

Hi all,

 

I have seen some questions regarding the performance of the FIR accelerator on the 215xx processor but unfortunately could not find a direct comparison of the max throughput.

So, correct me if I am wrong (and I hope somebody does ...):

Given the formulas from the processor hardware refererences for both platforms

215xx: (195 + 2 × N × 11 + W × (N/4+2) ) × C SCLK cycles

214xx: (49 + 4 × N +W(N/4 + 2)) × C PCLK cycles
where

N = 512 taps, W=16 samples and C = 8 channels

I get

215xx: 108312 SCLK cycles
214xx: 33416 PCLK cycles

Assuming a sampling rate of 48 kHz, 214xx PCLK = 225MHz and 215xx SCLK = 125MHz, with 16 samples block processing, this means, that the processing load is

214xx: 44.5% of the max available processing time

215xx: 260% of the max available processing time

which means that the 215xx is not able to process what the 214xx can do while yawning and painting it's fingernails.

 

Questions:

Is my assumption that the max SCLK is 125 MHz and the accelerator runs on this correct?

Is the performance really that bad?

 

Best regards,

 

Rainer

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