Intel 80312 I/O Companion Chip - ECEE

Intel ® 80312 I/O Companion ChipPCI and Peripheral Interrupt Controller Unit2.4 Operational BlocksThe PCI And Peripheral Interrupt Controller provides the connections to the Intel ® 80200processor. These connections are shown in Figure 2-1.Figure 2-1.Interrupt Controller ConnectionsP_INTA# OutputP_INTB# OutputP_INTC# OutputP_INTD# OutputS_INTD# Select bitS_INTC# Select bitS_INTB# Select bitS_INTA# Select bitIntel® 80312 I/O Companion ChipOutbound Doorbell 0Outbound Doorbell 1Outbound Doorbell 2Outbound Doorbell 3S_INTA#/IRQ0muxS_INTB#/IRQ1muxInterruptCombiningLogicFIQ#S_INTC#/IRQ2muxS_INTD#/IRQ3muxDMA Channel 0 Interrupt PendingDMA Channel 1 Interrupt PendingDMA Channel 2 Interrupt PendingPerformance Monitor Unit Interrupt PendingApplication Accelerator Interrupt PendingFIQ1 InterruptLatchI2C Bus Interface Unit Interrupt PendingMessaging Unit Interrupt PendingFIQ2 InterruptLatchBus Interface Unit ErrorPrimary PCI Bridge Interface ErrorSecondary PCI Bridge Interface ErrorPrimary ATU ErrorSecondary ATU ErrorMemory Controller Unit ErrorDMA Channel 0 ErrorDMA Channel 1 ErrorDMA Channel 2 ErrorMessaging Unit ErrorApplication Accelerator Unit ErrorIRQ InterruptLatchIRQ#Developer’s Manual 2-3