66 Mhz Clock Routing Length Guidelines; 82850E Platforms; 3V66 Clock Routing Requirement For Intel; Figure 28. Agp_66 Clock Routing Topology - Intel Pentium 4 Design Manual

R
4.4.2

66 MHz Clock Routing Length Guidelines

Table 8. 66 MHz Clock Routing Length Guidelines

Clock Group
AGP_66
CLK_66
NOTE: The routing length value of Z is 5 to 9 inches.
Figure 28 and Figure 29 show the recommended clock routing topologies for the 66 MHz clocks.

Figure 28. AGP_66 Clock Routing Topology

Figure 29. CLK_66 Clock Routing Topology

4.4.2.1

3V66 Clock Routing Requirement for Intel

The 3V66 trace (CK_G_66M_MCH) from the Clock Chip to MCH cannot be shorter than the
CPU Clock trace (CK_H_100M_MCH, CK_H_100M_MCH).
® ®
Intel Pentium 4 Processor / Intel
Length of Trace A (in)
0" to 0.5"
0" to 0.5"
CK00
Clock
A
Synthesizer
CK00
Clock
Synthesizer
®
850 Chipset Family Platform Design Guide
Platform Clock Routing Guidelines
Length of Trace B (in)
Z + (4" – 5")
R1
B
R1
A B
R1
A B
Clk_Routing_CLK-66
®

82850E Platforms

R1 (Ω)
Z 33
33
AGP Connector
Clk_Routing_AGP-66
MCH
ICH2
57