Motorola MVME2400 Series Wartungshandbuch Seite 148

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2-90 Computer Group Literature Center Web Site
Hawk PCI Host Bridge & Multi-Processor Interrupt Controller
2
XSOFFx PPC Slave Offset. This register contains a 16-bit offset
that is added to the upper 16 bits of the PPC address to
determine the PCI address used for transfers from the PPC
bus to PCI. This offset allows PCI resources to reside at
addresses that would not normally be visible from the
PPC bus. It is initialized to $8000 to facilitate a zero based
access to PCI space.
The PPC Slave Attributes Register3
(XSATT3) contains attribute
information associated with the mapping of PPC memory space to PCI
memory/IO space. The bits within the XSATT3 register are defined as
follows:
REN Read Enable. If set, the corresponding PPC slave is
enabled for read transactions.
WEN Write Enable. If set, the corresponding PPC slave is
enabled for write transactions.
WPEN Write Post Enable. If set, write posting is enabled for the
corresponding PPC slave.
IOM PCI I/O Mode. If set, the corresponding PPC slave will
generate PCI I/O cycles using spread addressing as
defined in the section on Generating PCI Cycles. When
clear, the corresponding PPC slave will generate PCI I/O
cycles using contiguous addressing.
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