Motorola MVME2300 Series 用户手册
2-46
Computer Group Literature Center Web Site
Raven PCI Bridge ASIC
2
WPEN
Write-Post Enable. If set, write-posting is enabled for the
corresponding MPC slave.
corresponding MPC slave.
MEM
PCI Memory Cycle. If set, the corresponding MPC slave
will generate transfers to or from PCI memory space.
When clear, the corresponding MPC slave will generate
transfers to or from PCI I/O space using the addressing
mode defined by the IOM field.
will generate transfers to or from PCI memory space.
When clear, the corresponding MPC slave will generate
transfers to or from PCI I/O space using the addressing
mode defined by the IOM field.
IOM
PCI I/O Mode. If set, the corresponding MPC slave will
generate PCI I/O cycles using spread addressing as
defined in the section on
generate PCI I/O cycles using spread addressing as
defined in the section on
. When clear, the corresponding MPC slave will
generate PCI I/O cycles using contiguous addressing.
This field only has meaning when the MEM bit is clear.
This field only has meaning when the MEM bit is clear.
MPC Slave Offset/Attribute (3) Registers
MSOFF3
MPC Slave Offset. Contains a 16-bit offset that is added
to the upper 16 bits of the MPC address to determine the
PCI address used for transfers from the MPC bus to PCI.
This offset allows PCI resources to reside at addresses that
would not normally be visible from the MPC bus. It is
initialized to $8000 to facilitate a zero-based access to PCI
space.
to the upper 16 bits of the MPC address to determine the
PCI address used for transfers from the MPC bus to PCI.
This offset allows PCI resources to reside at addresses that
would not normally be visible from the MPC bus. It is
initialized to $8000 to facilitate a zero-based access to PCI
space.
Address
MSOFF3/MSATT3 - $FEFF005C
Bit
0 1 2 3 4 5 6 7 8 9
1
0
0
1
1
1
1
2
2
1
3
3
1
4
4
1
5
5
1
6
6
1
7
7
1
8
8
1
9
9
2
0
0
2
1
1
2
2
2
2
3
3
2
4
4
2
5
5
2
6
6
2
7
7
2
8
8
2
9
9
3
0
0
3
1
1
Name
MSOFF3
MSATT3
RE
N
N
WE
N
WP
E
N
IOM
Operation
R/W
R
R/W
R/W
R
R/W
R
R
R
R/W
Reset
$8000
$00
1
1
0
0
0
0
0
0