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DDR SDRAM specification was finalized by JEDEC in June 2000 (JESD79). [9] JEDEC has set standards for the data rates of DDR SDRAM, divided into two parts. The first specification is for memory chips, and the second is for memory modules. The first retail PC motherboard using DDR SDRAM was released in August 2000. [10]
ddr, ISO 639-3 code for the Dhudhuroa language; Disarmament, demobilization and reintegration, a component of peace processes; DNA-damage response, for repairing damaged DNA; Double data rate, a data transfer strategy of a computer bus DDR SDRAM, a computer memory standard that uses double-data-rate transfers; DDr., title for a double doctorate ...
East Germany (German: Ostdeutschland [ˈɔstˌdɔʏtʃlant] ⓘ), officially known as the German Democratic Republic (GDR; Deutsche Demokratische Republik [ˈdɔʏtʃə demoˈkʁaːtɪʃə ʁepuˈbliːk] ⓘ, DDR [ˌdeːdeːˈʔɛʁ] ⓘ), was a country in Central Europe from its formation on 7 October 1949 until its reunification with West Germany on 3 October 1990.
DDR SDRAM (sometimes called DDR1 for greater clarity) doubles the minimum read or write unit; every access refers to at least two consecutive words. Typical DDR SDRAM clock rates are 133, 166 and 200 MHz (7.5, 6, and 5 ns/cycle), generally described as DDR-266, DDR-333 and DDR-400 (3.75, 3, and 2.5 ns per beat).
DDR SDRAM popularized the technique of referring to the bus bandwidth in megabytes per second, the product of the transfer rate and the bus width in bytes. DDR SDRAM operating with a 100 MHz clock is called DDR-200 (after its 200 MT/s data transfer rate), and a 64-bit (8-byte) wide DIMM operated at that data rate is called PC-1600, after its ...
Double data rate SDRAM (DDR SDRAM or DDR) was a later development of SDRAM, used in PC memory beginning in 2000. Subsequent versions are numbered sequentially (DDR2, DDR3, etc.). DDR SDRAM internally performs double-width accesses at the clock rate, and uses a double data rate interface to transfer one half on each clock edge. DDR2 and DDR3 ...
The German Democratic Republic (GDR), German: Deutsche Demokratische Republik (DDR), often known in English as East Germany, existed from 1949 to 1990. [1] It covered the area of the present-day German states of Mecklenburg-Vorpommern, Brandenburg, Berlin (excluding West Berlin), Sachsen, Sachsen-Anhalt, and Thüringen.
The notch on DDR2 DIMMs is in a different position from DDR DIMMs, and the pin density is higher than DDR DIMMs in desktops. DDR2 is a 240-pin module, DDR is a 184-pin module. Notebooks have 200-pin SO-DIMMs for DDR and DDR2; however, the notch on DDR2 modules is in a slightly different position than on DDR modules.