Operating Instructions
2-9
2
PCI Arbitration
There are 7 potential PCI bus masters on the MVME2603/2604
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 ASIC (PCI/VME bus bridge controller)
❏
PMC Slot 1 (PCI mezzanine card)
❏
PMC Slot 2 (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 Series Single Board
Computer ProgrammerÕs Reference Guide
(part number V2600A/PG).
The arbitration assignments for the MVME2603/2604 are shown in
the following table.
Table 2-2. PCI Arbitration Assignments
PCI Bus Request
PCI Master(s)
PIB (Internal)
PIB
CPU
Secondary Ethernet
Secondary SCSI
Raven ASIC
Request 0
PMC Slot 2 (PCIX)
Request 1
PMC Slot 1
Request 2
Ethernet
Request 3
SCSI
Request 4
VMEbus (Universe ASIC)
Содержание MVME2603-1121A
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