Motorola MVME2400 Interrupt Handling, PCI Arbitration Assignments, PCI Bus Request PCI Masters

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Programming the MVME240x

The arbitration assignments for the MVME240x are shown in Table 4-2.

Table 4-2. PCI Arbitration Assignments

PCI Bus Request	PCI Master(s)
PIB (Internal)	PIB
CPU	Hawk ASIC
Request 0	PMC Slot 2
Request 1	PMC Slot 1
Request 2	PCI Expansion Slot
Request 3	Ethernet
Request 4	Universe ASIC (VMEbus)

Interrupt Handling

The Hawk ASIC, which controls the PHB (PCI Host Bridge) and the MPU/local bus interface functions on the MVME240x, performs interrupt handling as well. Sources of interrupts may be any of the following:

❏The Hawk ASIC itself (timer interrupts, transfer error interrupts, or memory error interrupts)

❏The processor (processor self-interrupts)

❏The PCI bus (interrupts from PCI devices)

❏The ISA bus (interrupts from ISA devices)

Figure 4-2 illustrates interrupt architecture on the MVME240x. For details on interrupt handling, refer to the MVME2400-Series VME Processor Module Programmer’s Reference Guide .

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