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W631GG6KB
10.9 On-Die Termination (ODT) Levels and Characteristics
10.9.1 ODT Levels and I-V Characteristics
On-Die Termination effective resistance R TT is defined by bits A9, A6 and A2 of the MR1 Register.
ODT is applied to the DQ, DM and DQS/DQS# pins.
A functional representation of the on-die termination is shown in Figure 97. The individual pull-up and
pull-down resistors ( R TT Pu and R TT Pd ) are defined as follows:
R TT Pu =
R TT Pd =
V DDQ - V Out
I Out
V Out
I Out
under the condition that R TT Pd is turned off
under the condition that R TT Pu is turned off
Chip in Termination Mode
ODT
I pu
R TT pu
To other
circuitry
like RCV, ...
R TT pd
V DDQ
I out = I Pd - I Pu
DQ
I out
V out
I pd
V SSQ
Figure 97 – On-Die Termination: Definition of Voltages and Currents
Publication Release Date: Dec. 09, 2013
Revision A05
- 113 -
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