Motorola MVME2300 Series 用户手册
2-44
Computer Group Literature Center Web Site
Raven PCI Bridge ASIC
2
START
Start Address. Determines the start address of a
particular memory area on the MPC 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
MPC address.
particular memory area on the MPC 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
MPC address.
END
End Address. Determines the end address of a particular
memory area on the MPC 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 MPC
address.
memory area on the MPC 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 MPC
address.
MPC Slave Address (3) Register
MSADD3, MSOFF3 and MSATT3 represent the only register group
which can be used to initiate access to the PCI Configuration Address
($80000CF8) and Configuration Data ($80000CFC) registers. Note that
this implies that MSxxx3 also represents the generation of PCI Special
Cycles. The power-up default values of MSADD3, MSOFF3 and
MSATT3 are set to allow access to PCI configuration space without MPC
register initialization. For additional information, please refer to the
description of the MSOFF3/MSATT3 registers under
which can be used to initiate access to the PCI Configuration Address
($80000CF8) and Configuration Data ($80000CFC) registers. Note that
this implies that MSxxx3 also represents the generation of PCI Special
Cycles. The power-up default values of MSADD3, MSOFF3 and
MSATT3 are set to allow access to PCI configuration space without MPC
register initialization. For additional information, please refer to the
description of the MSOFF3/MSATT3 registers under
.
To initiate a PCI cycle from the MPC bus, the MPC address must be
greater than or equal to the START field and less than or equal to the END
field.
greater than or equal to the START field and less than or equal to the END
field.
Address
MSADD3 - $FEFF0058
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
MSADD3
START
END
Operation
R/W
R/W
Reset
$8000
$8080