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shvlad's avatar
shvlad
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6 years ago

How to configure DSP block in "three 9x9 multipliers" mode?

Hi everyone Please help me configure DSP block in "three 9x9 multipliers" mode. I have a Cyclone V family chip, I've read this document https://www.intel.com/content/dam/www/programmable/us/en/pdfs/...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
6 years ago
Hi, I would like to apologize for the delay in response. It seems like I encounter some issues with notification reaching my mailbox. Sorry for the inconvenience. As I understand it, you have some inquiries related to fitting 3 9x9 multipliers into a single DSP block in CV devices. As we understand it from the handbook seems like this is something feasible. I understand that you mentioned that when using mult IP it seems like not working as well. Mind further elaborate on the issue you encounter with the mult IP? Would you mind to share with me a simple test design of your using the mult IP so that I could have a better understanding of the configuration as well as to facilitate further debugging. Please let me know if there is any concern. Thank you. Best regards, Chee Pin
shvlad's avatar
shvlad
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6 years ago

Dear Mr. Pin

Thank you for your answer.

I've prepared a test project (archive was attached to this message). There are three ways to create a mult in this project. Please comment or uncomment "define" in line 2-5 and check them.

For ways 0 and 2 I have one DSP, but incorrect result, and correct result, but 3 DSPs for a way 1.

Please, give me an example where DSP block works in 3-mult mode. I've seen a lot of beautiful pictures, but I haven't seen any code examples.