Ppc Slave Offset/Attribute (0, 1 And 2) Registers - Motorola MVME2400 Series Programmer's Reference Manual

PPC Slave Offset/Attribute (0, 1 and 2) Registers

Address XSOFF0/XSATT0 - $FEFF0044
XSOFF1/XSATT1 - $FEFF004C
XSOFF2/XSATT2 - $FEFF0054
Bit
Name XSOFFx
Operation R/W
Reset $0000
The PPC Slave Offset Registers (XSOFF0, XSOFF1, and XSOFF2)
contains offset information associated with the mapping of PPC memory
space to PCI memory/io space. The field within the XSOFFx registers is
defined as follows:
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.
The PPC Slave Attributes Registers (XSATT0, XSATT1, and XSATT2)
contain attribute information associated with the mapping of PPC memory
space to PCI memory/io space. The bits within the XSATTx registers 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 enable for the
corresponding PPC Slave.
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XSATTx
R
$00
Registers
2
2-85