Digital Equipment AlphaServer 1200, Service Manual

Page: 32 / 278

1-20
1.8.2 System Bus to PCI Bus Bridge
The bridge is the physical interconnect between the system bus and the PCI bus.
Figure 1-10 System bus to PCI bus Bridge Block Diagram
PCI Bus
System Bus
Control
Address
ECC & Data
<63:0>
ECC & Data
<127:64>
AD<31:0>
AD<63:32>
Control
Data A to B &
B to A bus
Data A
to B bus
PKW0507-97
CAP
MDPA
MDPB