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I am trying to implement PCI-Express functionality in an Altera PCI-Express capable device. Does the PCI-Express hard IP support INTA, INTB, INTC, and INTD legacy interrupts?

PCI Express

Altera's PCIe core only supports INTA.

For details, please refer to the materials at the URL link below and Table 8-1 on page 191.
  https://www.altera.com/en_US/pdfs/literature/ug/ug_pci_express.pdf


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