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Operating Instructions
2
PCI Arbitration
There are seven potential PCI bus masters on the MVME2700 single board
computer:
❏ Raven ASIC (MPU/PCI bus bridge controller)
❏ Winbond W83C553 PIB (PCI/ISA bus bridge controller)
❏ DECchip 21140 Ethernet controller
❏ SYM53C825A SCSI controller
❏ Universe II ASIC (PCI/VME bus bridge controller)
❏ PMC Slot 1 (PCI mezzanine card)
❏ PMCspan (PCI expansion)
The Winbond W83C553 PIB device supplies the PCI arbitration support
for these seven types of devices. The PIB supports flexible arbitration
modes of fixed priority, rotating priority, and mixed priority, as
appropriate in a given application. Details on PCI arbitration can be found
in the MVME2600/2700 Series Single Board Computer Programmer’s
Reference Guide.
The arbitration assignments for the MVME2700 are shown in the
following table.
Table 2-3. PCI Arbitration Assignments
PCI Bus Request PCI Master(s)
PIB (Internal) PIB
CPU Raven ASIC
Request 0 PMCspan (PCIX)
Request 1 PMC Slot 1
Request 2 Ethernet
Request 3 SCSI
Request 4 VMEbus (Universe II ASIC)
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