
	Where results make sense

Topic: Serial Presence Detect

In the News (Mon 28 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Serial Presence Detect - Wikipedia, the free encyclopedia
		Serial Presence Detect (SPD) refers to a standardized way to access manufacturer information from a computer memory module.
		The JEDEC standards require certain parameters to be placed in the lower 128 bytes of an EEPROM located on the memory module.
		These bytes often contain timing parameters, manufacturer, serial number, and other useful information about the module.
	en.wikipedia.org /wiki/Serial_Presence_Detect (110 words)

	Define serial presence detect - a Whatis.com definition - see also: SPD (Site not responding. Last check: 2007-10-21)
		When a computer is booted (started), serial presence detect (SPD) is information stored in an electrically erasable programmable read-only memory (EEPROM) chip on a synchronous dynamic random access memory (SDRAM) memory module that tells the basic input/output system (BIOS) the module's size, data width, speed, and voltage.
		Before SPD, memory chips were identified with parallel presence detect (PPD).
		PPD used a separate PIN for each bit of information, which meant that only the speed and density of the memory module could be stored because of the limited space for pins.
	searchsmb.techtarget.com /sDefinition/0,,sid44_gci533524,00.html (258 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		Serial presence detect replaced the parallel methodology and was standardized by JEDEC (at the request of major system manufacturers).
		A serial EEPROM is used to store the presence detect information as well as much more information.
		Serial presence detect uses 2 pins (one for data and one for "enable") to detect the presence of modules serially.
	www.macrotronusa.com /glossary/page27.html (181 words)

	PCTechGuide - The PC Technology Guide
		For a number of years, Parallel Presence Detect (PPD) was the traditional method of relaying the required information by using a number of resistors.
		This led to JEDEC defining a new standard, serial-presence detect (SPD).
		The Serial Presence Detect function is implemented using an 8-pin serial EEPROM chip.
	www.pctechguide.com /03memory_Presence_detect.htm (156 words)

	Glossary Search Results (Site not responding. Last check: 2007-10-21)
		Serial Port - A data port/connection standard that is usually used to connect modems and mice.
		Serial ports are largely being eliminated in favor of much faster USB and FireWire connection standards.
		Serial Presence Detect (SPD) - An 8-pin serial EEPROM chip available on some SDRAM memory that keeps specific information about a DIMM's size, speed, voltage, drive strength, number of row and column addresses, DIMM manufacturer, and RAM manufacturer.
	www.geek.com /glossary/glossary_search.cgi?s (10967 words)

	SPD Management
		The Serial Presence Detect is a small 256 bytes, 8-pin EEPROM chip mounted on a 168-pin DIMM module or a 144-pin SO DIMM module.
		SPD are becoming more critical for SDRAM modules as the motherboard interface for SDRAM has more complex set of options.
		Once the SPD information is edited, it can be saved by choosing the SAVE AS function from the File menu and saved with a .SPD extension, or it can be sent to SIMCHECK II's buffer for subsequent programming the SPD* of your modules.
	www.memorytesters.com /sim2/man_spd.htm (1165 words)

	LostCircuits, Tech Advice Guide
		In order to standardize the SDRAM interface, the so-called Serial Presence Detect was introduced in 1998 as part of the PC100 specifications hammered out by Intel.
		The SPD is a small EEPROM located in the corner of the DIMM's PCB and contains all necessary specifications of the DIMMs including speed of the individual components as CAS and bank cycle time as well as valid settings for the module and the manufacturer's code.
		One potential drawback of the SPD is that it is not write protected and, thus, anyone with an EEPROM writer can reprogram it to show data out of specs which suggest better quality than actually present.
	www.lostcircuits.com /advice/bios2/9.shtml (1069 words)

	LinuxElectrons: STMicro Introduces SPD EEPROM For JEDEC DDR2 Standard (Site not responding. Last check: 2007-10-21)
		The SPD is used on the latest versions of the DIMMs (Dual Inline Memory Modules) that provide most of the system memory in desktop PCs and printers, and in set-top boxes.
		The use of Serial Presence Detect memories is mandatory for all new 168-pin and 200-pin DDR2 modules.
		The SPD operates within a single supply voltage range of 1.7V to 3.6V, as required by DDR2, and is specified for the 0 to +70 degrees C temperature range.
	www.linuxelectrons.com /article.php/20040527023114309/print (497 words)

	Semiconductors datasheet Parts begin by 34 Page1
		34RC02JE-TE13 : 2-kb I2C Serial EePROM, Serial Presence Detect
		34RC02JI-TE13 : 2-kb I2C Serial EePROM, Serial Presence Detect
		34RC02LE-TE13 : 2-kb I2C Serial EePROM, Serial Presence Detect
	www.digchip.com /datasheets/parts/34/parts_34.php (144 words)

	SDRAM FAQ (Site not responding. Last check: 2007-10-21)
		These modules are typically used in Servers due to their added reliability (they place much less of an electrical load on the memory controller and therefore make it possible to have as many as 16 or 32 modules in a large system).
		Serial Presence Detect (or SPD) information is stored inside of a special component on the memory module.
		The information is read by the computer's BIOS during boot to tell the computer how to properly configure the memory controller for the memory modules that are installed in the system.
	www.corsairmicro.com /main/tsdramfaq.html (719 words)

	Module FAQ (Site not responding. Last check: 2007-10-21)
		Serial presence-detect is module-specific data stored in an on-board serial EEPROM.
		The data is used by the host system to determine what type, size, and speed the memory module is. The SPD also contains the manufacturer's data such as date codes and part numbers.
		The SDA pin (serial address/data I/O) is an open drain terminal, which requires a pull-up resistor to Vcc.
	www.micron.com /products/modules/faq_modules.html (333 words)

	Understanding DDR Serial Presence Detect (SPD) Table (Site not responding. Last check: 2007-10-21)
		Serial Presence Detect (SPD) data is probably the most misunderstood subject in the memory module industry.
		The SPD data actually provide vital information to the system Bios to keep the system working in optimal condition with the memory DIMM.
		On the serial number setting, JEDEC has no specification on the data format nor dictates the location of Most Significant Bit.
	www.simmtester.com /page/news/showpubnews.asp?num=101 (1826 words)

	BBPC News \| BuildOrBuy - SPD (Serial Presence Detect)
		The timing values listed as SPD settings are the values programmed into the Memory Module's SPD.
		The EEPROM (Electrically Erasable Programmable Read Only Memory) chip on a DIMM module are used for storing Memory chip Specifications, including Capacity, Speed, Voltage, Row and Column Addresses Strobe (RAS and CAS) plus Manufacturer.
		SPD timimg values are read by system's Bios as default settings for Memory Settings.
	www.buildorbuy.org /spd.html (72 words)

	SimpleTech Consumer Pages
		Serial Presence Detect (SPD) is a small EEPROM mounted on the DIMM that contains information about the DIMM module's size, data width, speed, voltage, etc. The Serial Presence Detect helps the system bios identify the memory as the correct type and properly configure the memory.
		The SPD is a line of code that allows the computer to identify the memory's functional makeup and how to interact with it.
		ECC (Error Checking and Correcting) performs "double bit detection and single bit correction." This means that if you have a single bit memory error, the chipset and memory will find and repair the error on the fly without you knowing that it happened.
	www.simpletech.com /support/support_faq-mem.php (3273 words)

	Expodata Systems the UK's Premier Supplier of PC Diagnostics & Memory Testers (Site not responding. Last check: 2007-10-21)
		The Serial Presence Detect (SPD) device is a small 8 pin EEPROM chip, having 256 bytes, mounted on a 168-pin DIMM module or a 144-pin SO DIMM module.
		Tthe SPD data of a PC133 modules is similar to the PC-100 SPD data, with the exception of byte 9 (SDRAM device cycle time CL=3) set to 75h (7.5nS) and byte 10 (SDRAM device access time from clock at CL=3) set to 54h (5.4nS).
		The acquired values will then be compared to the SPD data that is read and subsequently be displayed in the test log for comparative purposes.
	www.pctestpro.com /support/s2_ap12.htm (978 words)

	DatasheetArchive: Semiconductor Datasheets Page 5218 (Site not responding. Last check: 2007-10-21)
		Serial Electrically-Erasable PROM (EEPROM) - VCC=2.7 to 6V
		Serial Electrically-Erasable PROM (EEPROM) - VCC=1.8 to 6V
		Serial Electrically-Erasable PROM (EEPROM) - VCC=2.5 to 6V
	www.datasheetarchive.com /datasheet/pdf/5218.html (218 words)

	Intel Ram Scam
		"A series of beeps during POST (booting) with the pattern 1-3-3-1 indicates that there was a problem during memory detection.
		These companies and their links are found at http://developer.intel.com/design/motherbd/dk/DK_MEM.HTM After phoning several wholesalers and distributors for these companies, it was starting to appear that Intel will approve these companies and tell them what to program in the Serial Presence Detect EEPROM for a price.
		Some distributors and dealers tried to justify it by saying that this was Intels way of controlling the quality of the ram that goes into their motherboard.
	www.execulink.com /~impact/intel_memory_scam.htm (859 words)

	presence detect - FOLDOC Definition (Site not responding. Last check: 2007-10-21)
		The original scheme, called Parallel Presence Detect (PPD) used a separate pin for each bit of information.
		As the number of pins can not be very large this only allowed to identify the density and the speed of the chips.
		To allow for additional information the Serial Presence Detect (SPD) scheme was introduced which uses a serial EEPROM to store the presence detect information and requires only two pins (one for enabling it and one for data).
	www.nightflight.com /foldoc-bin/foldoc.cgi?presence+detect (116 words)

	Hardware Analysis - Forum - Serial Presence Detect?
		Serial Presence Detect(SPD) device data missing or inconclusive, "Properly programmed SPD device Data is required for reliable operation, DDR 266Mhz memory assumed at slowest settings." Then it said Dual Channel requires identical memory.
		Is it saying this last message to acknowledge thats Dual channel is working or that my sticks arent identical.
		The first message seems to me that its saying my ram is running at slowest possible speed until I get properly programmed SPD device data but im unsure.
	www.hardwareanalysis.com /content/topic/36255 (358 words)

	parallel presence detect - a Whatis.com definition
		Parallel presence detect (PPD) is a method of using resistors to communicate a memory module's speed and density to the basic input/output system (BIOS) when a computer
		The BIOS uses this information to configure the memory modules to run correctly or to detect if an incorrect memory module has been installed.
		Today, serial presence detect (SPD) is used on newer memory modules because SPD can store up to 400 times more information than PPD.
	whatis.techtarget.com /gDefinition/0,294236,sid44_gci537871,00.html (210 words)

	serial presence detect - OneLook Dictionary Search (Site not responding. Last check: 2007-10-21)
		We found 4 dictionaries with English definitions that include the word serial presence detect:
		Tip: Click on the first link on a line below to go directly to a page where "serial presence detect" is defined.
		Serial Presence Detect : Free On-line Dictionary of Computing [home, info]
	www.onelook.com /?w=serial+presence+detect (85 words)

	Industrial Newsroom
		Featuring 2 Kb capacity, Model M34E02 fufills Serial Presence Detect function used in high-speed memory modules conforming to JEDEC DDR2 specification.
		Geneva, May 27, 2004 — STMicroelectronics (NYSE: STM) has introduced a new application specific EEPROM designed to fulfill the Serial Presence Detect (SPD) function used in the new generation of higher speed memory modules conforming to the JEDEC DDR2 specification.
		It follows ST’s existing M34C02 SPD, but as well as the Permanent Software Protection for the lower 128 bytes — which are write protected in response to a specific instruction sequence — a temporary lock/unlock command has been added for the convenience of DRAM module makers.
	news.thomasnet.com /printready.html?prid=452134 (789 words)

	PPD or SPD Presence detect 8-pin serial EEPROM chip (Site not responding. Last check: 2007-10-21)
		SPD - Table of Fundamental Memory type (Appendix A)
		SPD - Table of Superset Memory Types (Appendix B)
		SPD - FPM and EDO DRAM (Appendix C)
	bugclub.org /eric/memory/ppd.html (213 words)

	The PC-100 Standard
		The speed of the memory chips is only one of several factors in the overall equation.
		Other factors include the quality and accuracy of the individual chips, the printed circuit board (PCB), the engineering of the circuitry on the PCB and the presence of an SPD (serial presence detect) device, to name a few.
		In addition, SDRAM chips must be used in conjunction with a correctly programmed EEPROM, a serial presence detect device that accurately defines the memory's characteristics, on a properly designed Printed Circuit Board.
	www.dewassoc.com /performance/memory/pc100_std.htm (1338 words)

	Intel® SR440BX Motherboard - Serial Presence Detect (SPD) Message on Boot
		Properly programmed SPD device data is required for reliable operation.
		"SERIAL PRESENCE DETECT (SPD) device data missing or inconclusive.
		For systems installed in data critical applications, we recommend using properly configured SPD memory.
	www.intel.com /support/motherboards/desktop/SR440BX/sb/cs-013652.htm (267 words)

	Zomi Computer & Internet Association (Site not responding. Last check: 2007-10-21)
		It is like saying that all the bits along one row are all on the same page, and the part will assume the same page is intended until a different page is specified.
		A bit added to a group of bits to detect the presence of an error.
		The parity bit looks at the other 8 bits and determines if they are even or odd and correspondingly is a 0 or 1.
	www.zcia.net /modules.php?name=Memory_Terms (3081 words)

	WinDrivers Computer Tech Support Forums - 'serial presence detect - device data missing
		AMI type bios...when i removed the company logo and allowed normal booting i see the message "'serial presence detect - device data missing".
		Hi Freddy, usually an SPD error refers to a bad memory component on Intel motherboards, quick way to find out is swap the memory, some Intel boards are pickier than others when it comes to using generic stuff.
		Comedy is simply a funny way of being serious.
	forums.windrivers.com /showthread.php?t=1841 (205 words)

	SPD - Security Policy Database, Serial Presence Detect, Software Product Description, System Products Division
		SPD - Security Policy Database, Serial Presence Detect, Software Product Description, System Products Division
		A clipless pedal system with a recessed cleat devised by Shimano primarily for mountain biking (SPD = Shimano Pedalling Dynamics!).
		Every attempt has been made to provide you with the correct acronym for SPD.
	www.auditmypc.com /acronym/SPD.asp (192 words)

	Computer Technology Forum - SPD (Serial Presence Detect) Prob..
		Computer Technology Forum - SPD (Serial Presence Detect) Prob..
		initially when during startup everything went ok and all devices were detected properly..
		!SPD (serial presence detect) unable to detect serial device!
	www.tech-forums.net /showthread.php?s=&threadid=6629 (221 words)

	SPD interface(Serial presence detect) - FPGA
		Posted: Fri Jun 10, 2005 8:17 am Post subject: SPD interface(Serial presence detect)
		I am implementing a SPD interface in an FPGA.
		SPD controller, or the state machine or microprocessor controlling it?)
	www.castalk.com /ftopic7024.html (2437 words)

Try your search on: Qwika (all wikis)