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 ?
IDT's DDR4 chipset includes register, data buffers and thermal sensors with serial presence detect (SPD).
According to IDT, its DDR4 register is part of a chipset that includes data buffers and thermal sensors with serial presence detect (SPD).
The model STTS424 is a stand-alone digital temperature sensor, while the STTS424E02 integrates the temperature sensor with a 2 Kbit serial presence detect EEPROM that is used on DIMMs to store timing parameters and other information about the module.
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.
Combining a temperature sensor with 4Kbit Serial EEPROM, the AT30TSE004A is designed for DRAM memory modules that support Serial Presence Detect (SPD).
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.
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.
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.
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.
NASDAQ: MCHP), a leading provider of microcontroller and analog semiconductors, today announced a series of Serial Presence Detect (SPD) EEPROM devices that support the latest Double Data Rate 2 (DDR2) DIMM modules used in today's high-speed PCs, as well as future DDR3 DIMM modules.
UpgradeDetect not only offers users a comprehensive list of suggested computer upgrades, it also alerts users if their system's oft-unprotected Serial Presence Detect (SPD) chip is at risk for virus.
Microchip's serial EEPROMs in 2x3 millimeter DFN packages can be used for a variety of existing and new applications, including: personal computers (serial presence detect in DIMM modules for laptops and PCs); consumer electronics (digital cameras, toys, remote controls, alarm systems and providing storage for programmable settings in sports/diving watches); wireless headsets (storage for programmable settings in Bluetooth headsets); and handheld scanners (storage for calibration settings in various types of scanners).