Sata Spread Spectrum

Sata Spread Spectrum

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ASUS Striker II Extreme: Mucho Bang, Mucho Bucks
by Kris Boughton on April 11, 2008 7:00 AM EST

Posted in
Motherboards

Index
It's getting expensive…
ASUS Striker II Extreme Board Layout and Features
ASUS Striker II Extreme Specifications
Test System Configuration and Methodology
Overall System Performance with PCMark Vantage
Synthetic 3D Graphics Results
Game Testing - Crysis
Game Testing - Unreal Tournament 3
Game Testing - Company of Heroes: Opposing Fronts
Intel 45nm Quad-Core Overclocking
Memory Access Latency and Read Performance
Memory Write and Copy Performance
Complete BIOS Tuning Guide - "Extreme Tweaker"
Complete BIOS Tuning Guide - "Extreme Tweaker" (Cont'd)
Complete BIOS Tuning Guide - "Memory Timing Setting"
Complete BIOS Tuning Guide - "Over Voltage"
Complete BIOS Tuning Guide - "Over Voltage" (Cont'd)
Complete BIOS Tuning Guide - "CPU Configuration"
Complete BIOS Tuning Guide - "Spread Spectrum Control"
Final Thoughts and Recommendations

Complete BIOS Tuning Guide - "CPU Configuration"
Final Thoughts and Recommendations

Index
It's getting expensive…
ASUS Striker II Extreme Board Layout and Features
ASUS Striker II Extreme Specifications
Test System Configuration and Methodology
Overall System Performance with PCMark Vantage
Synthetic 3D Graphics Results
Game Testing - Crysis
Game Testing - Unreal Tournament 3
Game Testing - Company of Heroes: Opposing Fronts
Intel 45nm Quad-Core Overclocking
Memory Access Latency and Read Performance
Memory Write and Copy Performance
Complete BIOS Tuning Guide - "Extreme Tweaker"
Complete BIOS Tuning Guide - "Extreme Tweaker" (Cont'd)
Complete BIOS Tuning Guide - "Memory Timing Setting"
Complete BIOS Tuning Guide - "Over Voltage"
Complete BIOS Tuning Guide - "Over Voltage" (Cont'd)
Complete BIOS Tuning Guide - "CPU Configuration"
Complete BIOS Tuning Guide - "Spread Spectrum Control"
Final Thoughts and Recommendations

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Complete BIOS Tuning Guide
- "Spread Spectrum Control"
Spread spectrum controls are really added
to motherboards for one purpose only - they are sometimes needed so that a device
for sale within the US can include a legitimate Declaration of Conformity stating
compliance with Part 15 of the Federal Communications Commission (FCC) Rules. This
stipulates that operation of the device (motherboard), (a) may not cause harmful
interference, and (b) must accept any interference received, including interference
that may cause undesired operation. Sales of electronic devices within the US require
the strict observation of all FCC rules and regulations.
As a general requirement, every motherboard
must be capable of generating and distributing more than one common clocking signal
used to coordinate latching times as needed for the transfer and receipt of data
across the many high-speed interfaces found in today's systems. Because it is uncommon
for different busses to share similar operating frequencies, and because each must
be kept independent of the others, a significant portion of motherboard resources
are spent locating, monitoring, and regulating these circuits. Each circuit must
include a reference frequency, or known base frequency, from which all other frequencies
can be derived. A local oscillator usual provides this functionality.
The problem is these oscillators can
sometimes cause electromagnetic interference (EMI) centered about their operating
frequencies. In an effort to prevent these types of undesired interferences the
FCC, an independent licensing organization for devices capable of transmitting electromagnetic
signals, either intended or otherwise, operating under the purview of the US government,
enacted "Rule 15," effectively limiting the output power of such devices.
Engineers, looking for a way to meet
regulation, began using a method for limiting such interferences called spread spectrum
clocking. Spread spectrum clocking causes the signal regulation circuit to slightly
vary the frequency about the target frequency, effectively "spreading"
the power over a somewhat larger frequency band. The method of operation can be
used to control system output power below the FCC standard limits, allowing for
a claim of full compliance.
As you can imagine, even the smallest
variation in a clocking signal can be enough to create data transfer errors. The
fundamentals of overclocking demand the cleanest, purest signal possible, which
is why spread spectrum should always be disabled unless you have
a good reason to enable it. Ergo, CPU Spread Spectrum , PCIE
Spread Spectrum , MCP PCIE Spread Spectrum , SATA
Spread Spectrum , and LDT Spread Spectrum should all
be set to Disabled.

В настоящее время, корпорация Dell Technologies не осуществляет отгрузок товаров и запасных частей, не оказывает услуги для Российских пользователей. Приносим извинения за причиненные неудобства. Пожалуйста, направляйте Ваши вопросы и заявления по адресу электронной почты DellTech.Moscow@dell.com либо по почтовому адресу : 123112, г. Москва, Пресненская набережная, 10, Блок С, 3 этаж, ООО «Делл»

All Books Conferences Courses Journals & Magazines Standards Authors Citations
Abstract: This work presents a new architecture of spread-spectrum clock generator providing 1.5-Gbit/s, 3-Gbit/s and 6-Gibt/s SATA compatible specifications. A two-stage delta-sig... View more
This work presents a new architecture of spread-spectrum clock generator providing 1.5-Gbit/s, 3-Gbit/s and 6-Gibt/s SATA compatible specifications. A two-stage delta-sigma modulator is proposed to simplify the hardware and to overcome the nonlinearity issue of triangular control voltage induced by supply voltage, process and temperature variations. The peak energy of the output clock spectrum is reduced by 17.3 dB at 6-GHz. The chip is designed in a 0.18-um CMOS process with an area of 0.57times0.45 mm
2
. The power consumption is 106 mW at a power supply of 1.8-V.
Date of Conference: 17-20 September 2008
Date Added to IEEE Xplore : 10 October 2008
Conference Location: Newport Beach, CA
References is not available for this document.

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Serial ATA (SATA) is one of the most popular ways to perform data transmission in PC's storage device at a fast data rate [1]. In current PCs, SATA I/II 1.5/3.0 Gbit/s are already a standard. The roadmap involves 6.0 Gbit/s in the near future [2]. The high speed clock that is required by SATA, however, also brings about serious electromagnetic interference (EMI) [1]. Disregarding this problem may lead to breakdown of system applications. One of the most flexible and efficient ways to reduce EMI is using spread spectrum scheme on system clock.
2007 IEEE International Symposium on Circuits and Systems
IEEE Transactions on Circuits and Systems II: Express Briefs
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