0 Replies Latest reply on Jun 21, 2011 3:27 AM by fabry_77

    pci express legacy irq routing (series 6 chipset)

    fabry_77

      Hi,

      I don't understand how the legacy irq generated from an endpoint attached to one of the 8 pciexpress port is routed to the PIC.

      I found register to route the pci pirqn# to PIC lines, and other registers to route internal functions to PIC lanes.

      But nothing to decide, for example, how the "intan" of pciexpress port 1 became (it seems) "pirqa#" and then "irq5" of the PIC. Is it a fixed routing or there is something I missed?

      Really thanks for any help,

      Fabrizio