Intel Pentium 4 User Manual

Layout Review Checklist
R
Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide 273
16.1.6 AGTL+ ( V
REF
HDVREF [3:0], HAVREF [1:0] and CCVREF)
√ Recommendations Reason/Impact/Documentation
• Processor must have at least one dedicated
voltage divider. There are four GTLREF
signals on the processor. Keep voltage
divider within 1.5 inches of the first V
REF
pin.
• Refer to Section 5.3.
• 82850 MCH requires one dedicated voltage
divider. Voltage divider must be within 1.5
inches of MCH V
REF
ball.
• Refer to Section 5.5.
• Decouple each voltage divider with a 1 µF
capacitor and each V
REF
pin with a 220 pF
capacitor as close to the pin as possible.
• This recommendation provides a low
impedance line without the cost of additional
plane or island.
• Refer to Section 5.3.
• When routing V
REF
use a ~12 mil line trace
width.
• This recommendation provides a low
impedance line without the cost of additional
plane or island.
• Refer to Section 5.2.
• Keep other signals 10 mils away from V
REF
signal.
• V
REF
signal must be a clean as possible
from noise.
• Refer to Section 5.3.

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