The bridge supports legacy interrupts for PCI if selected by the C_INTERRUPT_PIN parameter. (Can only be set to 1 when C_INCLUDE_RC = 0.) A value of 1 selects INTA, as defined in
Table: Top-Level Parameters
. If a legacy interrupt for PCI support is selected and the
msi_enable
output pin indicates that the bridge has endpoint MSI functionality disabled
(
MSI_enable
= 0), the
intx_msi_request
pin is defined as
INTX
. When the
INTX
pin goes High, an assert
INTA
message is sent. When the
INTX
pin goes Low, a deassert
INTA
message is sent. The interrupts needs to be synchronized to
axi_aclk_out
. These messages are defined in the PCI 2.1 specification. The
intx_msi_request
pin input is valid only when the bridge is operating in Endpoint mode (C_INCLUDE_RC=0).