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VenkateshSathar's avatar
VenkateshSathar
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

using DSPs in the FPGA as ALMs for standard FFT IP

Hi, We are using standard FPGA FFT IP for our design given by intel. we want to use many FFT IPs parallely for that the problem that we are seeing is resources for ALMs required is not suffiecient ...
VenkateshSathar's avatar
VenkateshSathar
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

1) when you turn off the auto DSP block replacement, means it will switch to ALM

-- I tried all the settings, none of the setting in it made it to take DSP consumed.

2) How many FFT IP that you have use in your design? Is that fine for your to have certain IP to use ALM totally?

-- Right now around 8 FFT IPs used of 2048 length each, but I need to use 8 more 256 FFT IPs too. I need ALMs to be free and let DSPs be used for the atleast allocated calculations according to datasheet. That is not happening now. According to datasheet it should consume some DSPs also so that the ALMs consumed will reduce.

3) unless the FFT IP have a setting for you to control the usage, but seems there dont have.

-- Unfortunately yes, I tried to see option in FFT IP given by INTEL, there is no option for DSPs selection related.

What kind of solution you guys propose now to make DSPs to be consumed for the respective logic atleast?