Ppc Slave Offset/Attribute (3) Registers - Motorola MVME5100 Programmer's Reference Manual

The fields within XSADD3 are defined as follows:
START
END

PPC Slave Offset/Attribute (3) Registers

Address
Bit
Name
Operation
Reset Regbase 0xfeff0000 => $8000
Regbase 0xfefe0000 => $7000
The PPC Slave Offset Register 3 (XSOFF3) contains offset information
associated with the mapping of PPC memory space to PCI I/O space. The
field within the XSOFF3 register is defined as follows:
XSOFFx
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Start Address. This field determines the start address of a
particular memory area on the PPC bus which will be used
to access PCI bus resources. The value of this field will be
compared with the upper 16 bits of the incoming PPC
address.
End Address. This field determines the end address of a
particular memory area on the PPC bus which will be used
to access PCI bus resources. The value of this field will be
compared with the upper 16 bits of the incoming PPC
address.
XSOFF3/XSATT3 - $FEFF005C
XSOFF3
R/W
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.
XSATT3
R
$00
Registers
2
2-91