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Computing (FOLDOC) dictionary
presence detect
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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).