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Honored Contributor
Honored ContributorPCIe MSI Interrupt
HI, I have Cyclone V/GT with Gen2 4 lane DMA example design. The FPGA card is plugged into PC running Windows 7. I wrote a windows driver. It seems that the MSI interrupt is not received. After t...
Altera_ForumHonored Contributor
Honored ContributorTo enable MSI interrupts, ensure the CRA port is enabled, host side needs to set the MSI enable bit and Interrupt Disable bit.
1. Set MSI Enable of MSI Control register, this bit is mapped to bit[16] of offset 0x50 in configuration space register. 2. Set Interrupt Disable bit[10] of Command register at configuration space offset register 0x4 to disable legacy interrupt. 3. Set bit[1] (Memory space) and bit[2] (Bus Master) of Command Register at configuration space offset register 0x4 to enable the ability to generate MSI message. Once users trigger the rxm_irq, the PCIe core will generates the interrupt message.
