5-6
BajaPPC-750: PMC/PCI Interface
5.4 PCI Interface
The MPC106 must be initialized to enable the functions on the chip and to set up
the PCI bridge. The PCI bridge is used to decode portions of the local address bus
and the PCI address bus. Fig. 5-3 illustrates how the PCI bridge works.
Figure 5-3. PCI Bridge Memory Space
5.4.1 Device Mapping
Once the PCI bridge is initialized, PCI devices should be mapped so that they can
be accessed locally. In addition to the MPC106, there are two PMC expansion
slots and three PCI devices on the local PCI bus. Each PCI device requires its own
IDSEL address line as indicated in the table below:
Table 5-2. PCI Device Identification Mapping
PCI Device
IDSEL Address
PMC Slot 1
AD11
PMC Slot 2
AD12
Ethernet
AD15
VME bridge
AD16
ISA bridge
AD17
FEC0,0000
FD00,0000
0000,0000
8000,0000
0100,0000
Bridge
FEC0,0000
FD00,0000
0000,0000
8000,0000
0100,0000
PCI I/O Image
PCI
Memory
Image
Local RAM
PCI Memory Space
Local Space
Hex
Address
PCI I/O Space
Bridge
00C0,0000
0080,0000
0000,0000
PCI I/O
Bridge
PCI
Memory
FE80,0000
RAM Image
Physical
Содержание BajaPPC-750
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