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.
Combining a temperature sensor with 4Kbit Serial EEPROM, the AT30TSE004A is designed for DRAM memory modules that support Serial Presence Detect (SPD).
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.