Electrical Specifications
The electrical design of the SDRAM DIMM is defined by the JEDEC standard 21-C specification. The specification is available from the Electronics Industry Association's website, at
http://www.jedec.org/download/freestd/pub21/
The presence detect serial EEPROM specified in the JEDEC standard is required and must be set to properly define the DIMM configuration. Details about the required values for each byte on presence detect EEPROM can be found in sections 4.5.4 and 4.1.2.5 of the JEDEC standard 21-C specification.
Capacitance of the data lines must be kept to a minimum. Individual DRAM devices should have a pin capacitance of not more than 5 pF on each data pin.
Important:
RAM modules for the Power Mac G4 must conform to the PC100 specification. In particular, they must behave correctly when the CKE signal is low, as defined in the specification.