Motorola MVME2300 Series 사용자 설명서
5-1
5
5
Programming Details
Introduction
This chapter discusses details of several programming functions that are
not tied to any specific ASIC chip.
not tied to any specific ASIC chip.
PCI Arbitration
PCI arbitration is performed by the PCI-to-ISA Bridge (PIB) which
supports six PCI external PCI masters. The PIB can also be a PCI master
for ISA DMA functions. The arbitration assignments on the MVME2300
series are as follows:
supports six PCI external PCI masters. The PIB can also be a PCI master
for ISA DMA functions. The arbitration assignments on the MVME2300
series are as follows:
Upon power-up, the PIB defaults to a “round-robin” arbitration mode. The
relative priority of each request/grant pair can be customized via PCI
Priority Control Register 1. Refer to the W83C553 Data Book for
additional details, in
relative priority of each request/grant pair can be customized via PCI
Priority Control Register 1. Refer to the W83C553 Data Book for
additional details, in
.
Table 5-1. PCI Arbitration Assignments
Pci Bus Request
PCI Master(s)
PIB (internal)
PIB
CPU
Raven ASIC
Request 0
PMC Slot 2
Request 1
PMC Slot 1
Request 2
PCIX Slot
Request 3
Ethernet
Request 4
Universe ASIC (VMEbus)