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W9725G6IB
4M × 4 BANKS × 16 BIT DDR2 SDRAM
Table of Contents-
1.
2.
3.
4.
5.
6.
7.
7.1
7.2
GENERAL DESCRIPTION ...................................................................................................................4
FEATURES ...........................................................................................................................................4
KEY PARAMETERS .............................................................................................................................5
BALL CONFIGURATION ......................................................................................................................6
BALL DESCRIPTION............................................................................................................................7
BLOCK DIAGRAM ................................................................................................................................8
FUNCTIONAL DESCRIPTION..............................................................................................................9
Power-up and Initialization Sequence ...................................................................................................9
Mode Register and Extended Mode Registers Operation ...................................................................10
7.2.1
7.2.2
7.2.2.1
7.2.2.2
7.2.2.3
7.2.2.4
7.2.3
7.2.3.1
7.2.3.2
7.2.3.3
7.2.4
7.2.5
7.2.5.1
Mode Register Set Command (MRS)...............................................................................10
Extend Mode Register Set Commands (EMRS) ..............................................................11
Extend Mode Register Set Command (1), EMR (1)................................................11
DLL Enable/Disable................................................................................................12
Extend Mode Register Set Command (2), EMR (2)................................................13
Extend Mode Register Set Command (3), EMR (3)................................................14
Off-Chip Driver (OCD) Impedance Adjustment ................................................................15
Extended Mode Register for OCD Impedance Adjustment ....................................16
OCD Impedance Adjust ..........................................................................................16
Drive Mode .............................................................................................................17
On-Die Termination (ODT)...............................................................................................18
ODT related timings .........................................................................................................18
MRS command to ODT update delay.....................................................................18
7.3
Command Function.............................................................................................................................20
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
7.3.6
7.3.7
7.3.8
7.3.9
7.3.10
7.3.11
Bank Activate Command..................................................................................................20
Read Command ...............................................................................................................20
Write Command ...............................................................................................................21
Burst Read with Auto-precharge Command.....................................................................21
Burst Write with Auto-precharge Command .....................................................................21
Precharge All Command ..................................................................................................21
Self Refresh Entry Command ..........................................................................................21
Self Refresh Exit Command .............................................................................................22
Refresh Command ...........................................................................................................22
No-Operation Command ..................................................................................................23
Device Deselect Command..............................................................................................23
7.4
Read and Write access modes ...........................................................................................................23
7.4.1
7.4.1.1
Posted CAS ....................................................................................................................23
Examples of posted CAS operation......................................................................23
Publication Release Date: Oct. 23, 2009
-1-
Revision A04
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