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Altera_Forum's avatar
Altera_Forum
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12 years ago

Pcie Address problems

I'm running the PCIE to external memory design(an431) on the cyclone 4 starter kit, and I'm confused with some address issues. 1. From the Qsys design, I can see the onchip mem start from addre...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

When an Avalon master access is done for a PCIe slave access the high address bits depend on the BAR, the low address bits come from the PCIe address.

The way PCIe BARs are setup by sopc is confusing since it tries to hide this - so digs itself into a hole, dunno if qsys is any better.