Devices are required to stick to a protocol so which the interrupt-ask for (IRQ) traces is usually shared. The PCI bus includes 4 interrupt lines, INTA# via INTD#, all of which can be obtained to each product. Nearly 8 PCI units share the same IRQ line (INTINA# by way of https://nathanlabsadvisory.com/3rd-party-security-audit-assessment/