W632GU8KB Datasheet, PDF (112/160 Pages) Winbond – 32M X 8 BANKS X 8 BIT DDR3L SDRAM

W632GU8KB
10.9 On-Die Termination (ODT) Levels and Characteristics
10.9.1 ODT Levels and I-V Characteristics
On-Die Termination effective resistance RTT 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 (RTTPu and RTTPd) are defined as follows:
RTTPu = ^{VDDQ - VOut}
I _Out
under the condition that RTTPd is turned off
RTTPd = ^VOut
I _Out
under the condition that RTTPu is turned off
Chip in Termination Mode
ODT
Ipu
VDDQ
RTTpu
Iout = IPd - IPu
To other
circuitry
like RCV, ...
RTTpd
Ipd
DQ
Iout
Vout
VSSQ
Figure 97 – On-Die Termination: Definition of Voltages and Currents
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Publication Release Date: Jan. 20, 2015
Revision: A05