Service manual

1-16 AlphaServer 4000/4100 Service Manual
1.8 System Architecture
Alpha microprocessor chips are used in these systems. The CPU, memory, and
the I/O bridge module(s) are connected to the system bus motherboard.
Figure 1-12 Architecture Diagram
PKW0421E-96
System Bus
Memory
Pair
CPU
PCI/EISA
Slot
System to
PCI Bus
Bridge 0
PCI Slot
EISA
Bridge
PCI/EISA
Slot
PCI/EISA
Slot
128-Bit Data Bus + 16 ECC and 40-Bit Command/Address Bus
PCI Motherboard
(left hand)
PCI Motherboard
(right hand)
System to
PCI Bus
Bridge 1
System to
PCI Bus
Bridge 2
PCI Slot
PCI Slot
PCI Slot
PCI Slot
System to
PCI Bus
Bridge 3
PCI Slot
PCI Slot
PCI Slot
PCI Slot
6
4
B
i
t
P
C
I
PCI Slot
PCI Slot
PCI Slot
PCI Slot
6
4
B
i
t
P
C
I
6
4
B
i
t
P
C
I
6
4
B
i
t
P
C
I
Left Hand
Bridge
Right Hand
Bridge
4100 only
4100 only
4100 only
4000
only
4000
only
4100 only