presence detect

presence detect

(storage)
A means of identifying a memory chip to the memory controller logic. 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).
References in periodicals archive ?
Combining a temperature sensor with 4Kbit Serial EEPROM, the AT30TSE004A is designed for DRAM memory modules that support Serial Presence Detect (SPD).
Corsair's Mac Memory features special Serial Presence Detect (SPD) profile characteristics, so that Macs can self-configure for optimal performance for critical applications.
These devices complement the latest IDT family of low power temperature sensors with serial presence detect (SPD) for a full low power solution for enterprise-class memory modules.
a leading provider of microcontroller, mixed-signal, analog and Flash-IP solutions, today introduced a new 4Kb I2C Serial Presence Detect (SPD) EEPROM device the 3404.
Additionally, the ability to capture Serial Presence Detect (SPD) data lets developers automatically discover the memory parameters used by system under test.
This new open standard enhances the Serial Presence Detect (SPD), thus simplifying overclocking for beginners and providing unparalleled control for experts.
The new product family includes a stand-alone temperature sensor (TS3000GB2), as well as one with an integrated 256-byte EEPROM array (TSE2002GB2) on a single, monolithic die for non-volatile storage of user information, such as system configuration data for the Serial Presence Detect (SPD) feature of the memory module.
GENEVA, March 8 /PRNewswire-FirstCall/ -- STMicroelectronics (NYSE: STM), a leader in analog ICs, has introduced the STTS2002, an integrated Serial Presence Detect (SPD) EEPROM memory and temperature-monitoring IC.
The IDT offering includes a stand-alone temperature sensor (TS3000B3), as well as one with an integrated 256-byte EEPROM array (TSE2002B3) on a single, monolithic die for non-volatile storage of user information, such as system configuration in a Serial Presence Detect (SPD) for memory modules.
The new STTS424 is a standalone digital temperature sensor, while the STTS424E02 integrates the temperature sensor with a 2 Kbit Serial Presence Detect (SPD) EEPROM that is used on DIMMs to store timing parameters and other information about the module, in accordance with JEDEC requirements.
Shipping immediately in 4GB memory kits, the HyperX([R]) PC2-6400 CL4 SO-DIMMs offer the additional benefit of Serial Presence Detect (SPD) capabilities to provide performance benefits to a wider array of notebooks.
Developed as an extension to the traditional Serial Presence Detect (SPD) found on today's high-performance DIMMS, Enhanced Performance Profiles allow memory manufacturers to integrate additional module performance data in the unused portion of the JEDEC standard SPD, allowing compatible motherboards to read and take advantage of added performance capabilities.