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TSchu3's avatar
TSchu3
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10 months ago

Arria 10 M20k block usage- More block with less memory bits?

Hello I have a design that fits on the Arria 10 GX dev board with chip 10AX11552F4sI1SG which has 2713 M20K blocks. The total memory bits for this design are 36,171,984, all 2713 blocks are used. ...
Fpga Devkit
ShengN_altera's avatar
ShengN_altera
Icon for Super Contributor rankSuper Contributor
9 months ago

Hi,


May I know is there any further update or concern?


Thanks,

Regards,

Sheng


TSchu3's avatar
TSchu3
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9 months ago

Ok, so the problem seems to be that the new project targeting the smaller Arria device is not using any MLABS.

The original project on the larger Arria, is using many MLABs.

The settings that I am aware of that cover MLAB usage are

Auto RAM to MLAB Conversion- This is set to ON in both projects
Equivalent RAM and MLAB Paused read capabilities- Set to CARE in both projects

Equivalent RAM and MLAB power up- Set to AUTO in both projects

MLAB add timing contraints for mised port feed through mode setting don't care- set to OFF in both projects

They match which is expected since the new smaller chip project is just an archive of the original (and functional) project but moved to a different (smaller) chip.


What could cause the new project to not use any MLABs? Other settings I'm missing?

Thanks again.

  • TSchu3's avatar
    TSchu3
    Icon for Occasional Contributor rankOccasional Contributor
    9 months ago

    Does anyone have any suggestions? This problem still does not make any sense to me and none of the suggested ideas/issues explain what I am seeing.

    Thanks.