參數(shù)資料
型號: W972GG8JB-25
廠商: WINBOND ELECTRONICS CORP
元件分類: DRAM
英文描述: 256M X 8 DDR DRAM, 0.4 ns, PBGA60
封裝: 11 X 11.50 MM, ROHS COMPLIANT, WBGA-60
文件頁數(shù): 10/86頁
文件大?。?/td> 1466K
代理商: W972GG8JB-25
W972GG8JB
Publication Release Date: Feb. 18, 2011
- 18 -
Revision A02
7.2.4
On-Die Termination (ODT)
On-Die Termination (ODT) is a new feature on DDR2 components that allows a DRAM to turn on/off
termination resistance for each DQ, DQS/ DQS , RDQS/ RDQS , and DM signal 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 DRAM devices.
The ODT function can be used for all active and standby modes. ODT is turned off and not supported
in Self Refresh mode. (Example timing waveforms refer to 10.3, 10.4 ODT Timing for
Active/Standby/Power Down Mode and 10.5, 10.6 ODT timing mode switch at entering/exiting power
down mode diagram in Chapter 10)
DRAM
Input
Buffer
Input
Pin
VDDQ
sw1
Rval3
VDDQ
sw2
sw3
Rval1
Rval2
Rval1
Rval2
Rval3
sw1
sw2
sw3
VSSQ
Switch (sw1, sw2, sw3) is enabled by ODT pin.
Selection among sw1, sw2, and sw3 is determined by “Rtt (nominal)” in EMR (1).
Termination included on all DQs, DM, DQS, DQS , RDQS, and RDQS pins.
Figure 9
– Functional Representation of ODT
7.2.5
ODT related timings
7.2.5.1
MRS command to ODT update delay
During normal operation the value of the effective termination resistance can be changed with an
EMRS command. The update of the Rtt setting is done between tMOD,min and tMOD,max, and CKE
must remain HIGH for the entire duration of tMOD window for proper operation. The timings are shown
in the following timing diagram.
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