Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

pcie interface

we need to generate MSI interrupt to the application driver from the PCIe.The signal which we observed for generating interrupt in PCIe is "app_msi_req". Kindly could someone help us,if we have to generate the request from FPGA the signal is followed by few other signal like "app_msi_tc" , "msi_app_num". We are not able to get any info regarding this signals....could some one help us on this issue.....we need to write rtl to drive this values..what are the values to be driven????

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    13 years ago

    This information is defined in the PCIe User Guide - see link below:

    http://www.altera.com/literature/ug/ug_pci_express.pdf#page=124

    The app_msi_num[4:0] vector is to identify which of the 32 possible MSI interrupts you are asserting. The app_msi_tc[2:0] is identify which traffic class to send the MSI interrupt.

    I recommend getting a copy of the PCIe spec and digging in a bit on MSI, then come back to the PCIe User Guide. It will make more sense.