serial presence detect

1 definition found

serial presence detect - Free On-line Dictionary of Computing (26 May 2007) :

  presence detect
  Parallel Presence Detect
  PPD
  Serial Presence Detect
  SPD
  
     <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).
  
     (1998-03-07)