Motorola MVME2600 用户手册
2-10
Computer Group Literature Center Web Site
Operating Instructions
2
PCI Arbitration
There are seven potential PCI bus masters on the MVME2603/2604 single
board computer:
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 Programmer’s
Reference Guide, listed in
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 Programmer’s
Reference Guide, listed in
.
The arbitration assignments for the MVME2603/2604 are shown in the
following table.
following table.
Table 2-2. PCI Arbitration Assignments
PCI Bus Request
PCI Master(s)
PIB (Internal)
PIB
CPU
Secondary Ethernet
Secondary SCSI
Raven ASIC
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)