M14D2561616A Datasheet, PDF (30/59 Pages) Elite Semiconductor Memory Technology Inc. – 4M x 16 Bit x 4 Banks DDR II SDRAM

ESMT
M14D2561616A
ODT (On Die Termination)
On Die Termination (ODT) is a feature that allows a DDR2 SDRAM to turn on/off termination resistance for each DQ, all
DQS/ , and all DM signals via the ODT control pin. The ODT feature is designed to improve signal integrity of the memory
channel by allowing the DRAM controller to independently turn on/off termination resistance for any or all devices.
The ODT function is supported for Active and Standby modes. ODT is turned off and not supported in Self Refresh mode.
Timing for ODT Update Delay
CLK
CLK
Command
ODT
tAOFD
EMRS(1)
NOP
tIS
Internal
Rtt Setting
Old setting
tMOD(max.)
tMOD(min.)
Updating
New Setting
Note: t_AOFD must be met before issuing EMRS(1) command. ODT must remain low for the entire duration of t_MOD
window.
ODT Timing for Active and Standby Mode
T0
T1
T2
T3
T4
T5
CLK
CLK
CKE
ODT
Internal
Term Res.
tIS
tIS
tAOND
tAON(min.)
tAOFD
Rtt
tAON(max.)
tAOF(min.)
T6
tAOF(max.)
Elite Semiconductor Memory Technology Inc.
Publication Date : Feb. 2009
Revision : 1.1
30/59