Main Memory Technology Direction - Micron
Main Memory Technology Direction - Micron
Main Memory Technology Direction - Micron
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DDR2 to DDR3 Comparison<br />
Standard Features<br />
Features/Options DDR2 DDR3 Comments<br />
Data strobes<br />
Data bus termination<br />
Rtt<br />
Single-ended or<br />
differential<br />
ondie termination<br />
(ODT)<br />
opt. on MB<br />
Rtt values 50, 75, 150 ohm<br />
Rtt allowed<br />
Read, writes,<br />
standby<br />
Differential only Reduce data strobe crosstalk<br />
ondie termination<br />
(ODT)<br />
opt. on MB<br />
120, 60, 40, 30,<br />
20 ohm<br />
Optimized for higher data rates<br />
Support higher data rates<br />
Writes, standby DDR3 does not allow during reads<br />
Dynamic ODT None 120, 60 ohm Supports 2-slot; writes only<br />
DQ driver impedance 18 ohm 34 ohm<br />
Driver/ODT<br />
calibration<br />
None External resistor<br />
Optimized for 2-slot and pt-to-pt<br />
systems<br />
Improves accuracy over voltage<br />
and temperature
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