Datasheet

On-die termination effective resistances are defined and can be selected by any or all of the following options:
 MR1 A[10:8] (R
TT_NOM
) - Disable, 240Ω, 120Ω, 80Ω, 60Ω, 48Ω, 40Ω, and 34Ω.
 MR2 A[11:9] (R
TT_WR
) - Disable, 240Ω,120Ω, and 80Ω.
 MR5 A[8:6] (R
TT_PARK
) - Disable, 240Ω, 120Ω, 80Ω, 60Ω, 48Ω, 40Ω, and 34Ω.
ODT is applied to the following inputs:
 x16: DQs, LDM#, UDM#, LDQS, LDQS#, UDQS, and UDQS# inputs.
ODT Definition of Voltages and Currents
On die termination effective Rtt values supported are 240, 120, 80, 60, 48, 40, 34 ohms.
R
TT
=
V
DDQ
- Vout
| I out |
VSSQ
Chip In Termination Mode
R
TT
DQ
VDDQ
ODT
I
out
V
out
To other
circuitry like
Figure 163. On Die Termination
AS4C256M16D4
Confidential
- 147 of 201 -
Rev.1.0 Aug.2019