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Altera_Forum's avatar
Altera_Forum
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9 years ago

PCIe traffic from fpga

Hello, I am having some problems in sending data from FPGA to a processor via PCI express by using dev kits. I manage to send data from processor to FPGA via PCI express, but not ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Have you enabled Bus Mastering? There is a bit in the configuration space that determines whether or not the device should be allowed to send data autonomously on the PCIe bus (a process called bus mastering). This is usually something the OS will enable if your driver asks for it. How to enable it will depend on what OS you use (Linux vs. Windows) and what driver framework you build on.