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1701 : FIR-Filter : ROM Address exceeds 1024

SigmaDSP & SigmaStudio stmoeller60 Jan 3, 2011 00:00 2 replies Original on forum ↗
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stmoeller60 Question
Jan 3, 2011 00:00

How big can FIR Filter get for 1701 ? not more than 1024 table entries ?

ADIApproved Reply
Jan 3, 2011 00:00

An FIR filter on the ADAU1701 will use 1 program instruction/tap, 1 parameter/tap, and 1 data memory word/tap. Both the program and parameter RAM sizes on the ADAU1701 are 1024 words, so that's the maximum size FIR filter that you can implement. In your actual implementation, the maximum size will be a bit less than 1024 taps because you'll need to use at least a few of the instructions for reading the inputs and writing to the outputs.

stmoeller60 Reply
Jan 4, 2011 00:00

Thanks !