Intel Pentium 4 User Manual

Platform Clock Routing Guidelines
R
50 Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide
4.3.3.1 Trace Lengths
Figure 20 shows the critical RDRAM device clock routing sections, with the routing lengths for
each section defined in Table 6.
Figure 20. Rambus RDRAM* Device Clock Routing Dimension
RDRAM_Clk_Routing
MCH
DRCG
ABC
TERM
D
Table 6. Rambus RDRAM* Device Clock Routing Guidelines
Clock From
To Length
(inches)
300/400 MHz
RDRAM
Technology
Length
(inches)
533 MHz
RDRAM
Technology
Figure
20
Trace
Rambus DRCG*
Second RIMM*
connector
0.0 – 6.0 0.0 – 6.0 D
RIMM connector RIMM connector 0.4 – 1.0 0.4 – 1.0 B
CTM/CTM#
1
First RIMM
connector
Chipset 1.0 – 6.0 1.0 – 4.0 A
Chipset First RIMM connector 1.0 – 6.0 1.0 – 4.0 A
RIMM connector RIMM connector 0.4 – 1.0 0.4 – 1.0 B
CFM/CFM#
2
Second RIMM
connector
Termination 0.0 – 2.0 0.0 – 2.0 C
NOTES:
1. First RIMM connector to chipset:
Trace length needs to be compensated to match the RSL signals from chipset to first RIMM connector.
2. Chipset to first RIMM connector:
Trace length needs to be compensated to match the RSL signals from first RIMM connector to chipset.
In clock routing sections ‘A’ and ‘D’, it is recommended that the clock signals (CTM/CTM# and
CFM/CFM#) be routed differentially. An example recommended topology for microstrip
differential clock routing is shown in Figure 21.
Note: Clock trace widths and spacing may change with different prepreg thicknesses.

Intel Pentium 4 Specifications

General

Architecture	x86
Core Count	1
Microarchitecture	NetBurst
Manufacturer	Intel
Core Names	Willamette, Northwood, Prescott, Cedar Mill
Virtualization Technology	No
Release Date	November 20, 2000
Clock Speed	1.3 GHz to 3.8 GHz
FSB Speed	400 MHz to 1066 MHz
Socket	Socket 423, Socket 478, LGA 775
Introduced	2000
Product Line	Pentium
Front Side Bus	400 MHz to 1066 MHz
Hyper-Threading	Yes (Prescott and later)
64-bit Support	Yes (Prescott and later)
Instruction Set	MMX, SSE, SSE2, SSE3
Discontinued	2008
Process Technology	180 nm, 130 nm, 90 nm, 65 nm
L2 Cache	256 KB, 512 KB, 1 MB, 2 MB
Lithography	180 nm, 130 nm, 90 nm, 65 nm
L1 Cache	8 KB