1-2 AlphaServer DS20 User’s Guide
1.1
System Architecture
The AlphaServer DS20 is a high-performance system. Figure 1–1 shows the
system architecture.
Figure 1–1 System Architecture
C chip
CPU 1
(optional)
CPU 0
B cache
B cache
8 D chips
P chip
P chip
Memory
Banks
Up to 2
Memory
Banks
64 bit PCI
64 bit PCI
Command, Address, and Control lines for each Memory Array
Control lines for D chips
Memory
Data
Bus
CPU
Data
Bus
CAPbus
PA D
Bus
CMD/
Addr.
CMD/
Addr.
Probe/
Addr.
Probe/
Addr.
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