SPRUJB3 March 2024 AM67 , AM67A , TDA4AEN-Q1 , TDA4VEN-Q1
The Vendor Specific Capability signal of the PCIe core, F0_VSEC_INTERRUPT_OUT, is used to generate interrupts to the EP from the RP. The F0_VSEC_INTERRUPT_OUT represents the interrupt for the EP Physical Function 0. This signal is used to generate the PCIE_DOWNSTREAM_PULSE interrupt to the local host.
The RP can write to the Vendor Specific Control registers (PCIE_CORE_PFn_I_VENDOR_SPECIFIC_CONTROL_REG) to assert this signal at the EP and this will trigger the PCIE_DOWNSTREAM_PULSE interrupt to the EP host.