Intel Pentium 4 User Manual

System Bus Routing
R
66 Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide
Common Clock
Common clock signals should be routed to a minimum pin to pin motherboard length of 6 inches
and a maximum motherboard length of 10 inches.
Figure 33. Processor Topology
850 MCH Processor
Length L1
Package trace
Motherboard PCB trace
Pad Pad
5.3.1.2 Design Considerations
Intel has found that the following recommendations aid in the routing of the processor, given the
example stack-up shown in Figure 9.
• Line width is 7.0 mil.
• Trace to trace spacing is 13.0 mil (except in component breakout where spacing is
constrained where 5 mil spacing is acceptable)
Table 12. Processor Package Lengths
Net Name Intel
®
Pentium
®
4 Processor in
478-pin Package Length (inches)
Intel
®
Pentium
®
4 Processor with
512-KB L2 Cache on 0.13 Micron
Process Package Length (inches)
Address Group 0
ADSTB#[0] 0.201 0.219
A#[03] 0.344 0.393
A#[04] 0.249 0.281
A#[05] 0.139 0.170
A#[06] 0.394 0.436
A#[07] 0.279 0.330
A#[08] 0.130 0.157
A#[09] 0.369 0.374
A#[10] 0.323 0.330
A#[11] 0.230 0.261
A#[12] 0.382 0.407
A#[13] 0.396 0.420
A#[14] 0.335 0.362

Intel Pentium 4 Specifications

General

Brand	Intel
Model	Pentium 4
Category	Computer Hardware
Language	English