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COM Express Interfaces

Figure 59: PCI Bus Interrupt Routing

Most of these PCI devices only utilize the interrupt signal 'INTA#'. To distribute the interrupt

source of the devices over the interrupt signals 'INTB#', 'INTC#' and 'INTD#', an interrupt cross

routing scheme has to be implemented on the COM Express Carrier Board design. Figure 59

above and Table 49 below illustrate the PCI bus interrupt routing for the PCI bus slots 1-4.

Table 49: PCI Bus Interrupt Routing

Device Signal Slot / Device 1 Slot / Device 2 Slot / Device 3 Slot / Device 4

IDSEL PCI_AD[20] PCI_AD[21] PCI_AD[22] PCI_AD[23]

INTA# PCI_IRQ[A]# PCI_IRQ[B]# PCI_IRQ[C]# PCI_IRQ[D]#

INTB# (if used) PCI_IRQ[B]# PCI_IRQ[C]# PCI_IRQ[D]# PCI_IRQ[A]#

INTC# (if used) PCI_IRQ[C]# PCI_IRQ[D]# PCI_IRQ[A]# PCI_IRQ[B]#

INTC# (if used) PCI_IRQ[D]# PCI_IRQ[A]# PCI_IRQ[B]# PCI_IRQ[C]#

Requests and Grants cannot be shared. There should only be a single REQ / GNT pair per

device.

PICMG

COM Express

Carrier Board Design Guide Rev. 2.0 / December 6, 2013

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Kontron COMe Starterkit Eval T2 Manual de usuario Pagina 149