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RVadl's avatar
RVadl
Icon for New Contributor rankNew Contributor
7 years ago

PCIe BAR mapping

Background: Our system with Altera Cyclone IV FPGA requires 5 devices namely 3 Ethernet MACs and 2 HDLC channels on Cyclone IV FPGA. We are using a PCIe interface between FPGA and processor. Qu...
anilinintel's avatar
anilinintel
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

you can connect more than 1 device to any bar. I usually connect 4 devices to bar2 and i will start with 0x0 for the first device and i will maintain continuity till the last device. you can do this by editing <bar tab> in qsys design . you have to take one more caution here, if your vmap is 64MB from the host then all the devices u connect together together to any single bar should not exceed 64MB. ofcourse, if it is above that , u can use windowing in host appcode or HW windowing via address span extender. Hope this helps dude!!!