| 释义 |
presence detect presence detect (storage)A means of identifying a memory chip to the memorycontroller logic. The original scheme, called ParallelPresence Detect (PPD) used a separate pin for each bit ofinformation. As the number of pins can not be very large thisonly allowed to identify the density and the speed of thechips. To allow for additional information the SerialPresence Detect (SPD) scheme was introduced which uses aserial EEPROM to store the presence detect information andrequires only two pins (one for enabling it and one for data). |