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Altera_Forum's avatar
Altera_Forum
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11 years ago

How to connect my FIFO to mSGDMA inside Qsys?

I create my PCIe project based on Wiki's examples, removed the DDR3 and added FIFO inside Qsys. I can't connect my FIFOs to mSGDMA after i added them to my Qsys. I attached the project.
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

Yes, QSYS will automatically insert a MM-Bridge. But this is not very efficient.

An example:

You want to connect ten PIOs with 32Bit width to your PCIe, QSYS will create ten Bridges between PCIe and the PIOs.

This will need many ressources on your FPGA.

The Better way:

Implement one MM-Bridge by yourself and connect all ten PIOs to the Bridge and the other Port to PCIe. By this way you safe the Ressources for nine Bridges.