Intel Pentium 4 User Manual

Hub Interface Routing
R
130 Intel
®
Pentium
®
4 Processor / Intel
®
850 Chipset Family Platform Design Guide
8.2.4 8-Bit Hub Interface Compensation
The hub interface uses a compensation signal to adjust buffer characteristics to the specific board
characteristic. The hub interface requires Resistive Compensation (RCOMP).
Table 32. 8-Bit Hub Interface RCOMP Resistor Values
Component Hub Interface
Buffer Mode
Trace
Impedance
RCOMP Resistor
Value
RCOMP Resistor
Tied to
ICH2 Normal 60 Ω ± 15% 40 Ω ± 2% or 39 Ω ± 1% VCC1_8
MCH Normal 60 Ω ± 15% 40 Ω ± 2% or 39 Ω ± 1% VSS
8.2.5 8-Bit Hub Interface Decoupling Guidelines
To improve I/O power delivery, use two 0.1 µF capacitors per each component (i.e., the ICH2 and
MCH). These capacitors should be placed within 150 mils from each package, adjacent to the
rows that contain the hub interface. If the layout allows, wide metal fingers running on the VSS
side of the board should connect the VCC1_8 side of the capacitors to the VCC1_8 power pins.
Similarly, if layout allows, metal fingers running on the VCC1_8 side of the board should connect
the ground side of the capacitors to the VSS power pins.

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