Service manual

1-28 AlphaServer 4000/4100 Service Manual
1.14 System Bus to PCI Bus Bridge Module
The bridge module is the physical interconnect between the system motherboard
and any PCI motherboard in the system.
Figure 1-18 Bridge Module
MDPB
MDPA
CAP
PCI Bus
Control
Address
ECC & Data
<63:0>
ECC & Data
<127:64>
AD<31:0>
AD<63:32>
Control
Data A t o B &
BtoAbus
Dat a A
to B bus
PKW0426r-96