System Bus Routing
R
86 Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide
Figure 53, Customer Reference Platform System Bus Routing – Bottom Layer
Bottom Layer
Addr
Data
Roughly half of the signals are routed on the bottom of the board referenced to GND, and the other
half of the signals are routed on the top of the board referenced to V
CCP
. The signals are routed
from the MCH to both sides of the processor socket. No signals are routed through the center of
the socket.
Careful attention must be paid when routing the system bus signal in order to maintain good power
delivery for the processor. It is important that the V
CCP
and GND flood is continuous from the
OSCONs to the high frequency ceramic capacitors to help minimize the inductance of the power
and ground planes.