
4 |
Programming the MVME240x
The arbitration assignments for the MVME240x are shown in Table
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
❏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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