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W9725G6KB25A Datasheet(HTML) 1 Page - Winbond

Part No. W9725G6KB25A
Description  DLL aligns DQ and DQS transitions with clock, Data masks (DM) for write data, Write Data Mask
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Maker  WINBOND [Winbond]
Homepage  http://www.winbond.com
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W9725G6KB25A Datasheet(HTML) 1 Page - Winbond

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W9725G6KB
4M  4 BANKS  16 BIT DDR2 SDRAM
Publication Release Date: Sep. 03, 2012
- 1 -
Revision A03
Table of Contents-
1.
GENERAL DESCRIPTION ...................................................................................................................4
2.
FEATURES ...........................................................................................................................................4
3.
ORDER INFORMATION .......................................................................................................................5
4.
KEY PARAMETERS .............................................................................................................................5
5.
BALL CONFIGURATION ......................................................................................................................6
6.
BALL DESCRIPTION............................................................................................................................7
7.
BLOCK DIAGRAM ................................................................................................................................8
8.
FUNCTIONAL DESCRIPTION..............................................................................................................9
8.1
Power-up and Initialization Sequence ...................................................................................................9
8.2
Mode Register and Extended Mode Registers Operation ...................................................................10
8.2.1
Mode Register Set Command (MRS)...............................................................................10
8.2.2
Extend Mode Register Set Commands (EMRS) ..............................................................11
8.2.2.1
Extend Mode Register Set Command (1), EMR (1)................................................11
8.2.2.2
DLL Enable/Disable ................................................................................................12
8.2.2.3
Extend Mode Register Set Command (2), EMR (2)................................................13
8.2.2.4
Extend Mode Register Set Command (3), EMR (3)................................................14
8.2.3
Off-Chip Driver (OCD) Impedance Adjustment ................................................................15
8.2.3.1
Extended Mode Register for OCD Impedance Adjustment ....................................16
8.2.3.2
OCD Impedance Adjust ..........................................................................................16
8.2.3.3
Drive Mode .............................................................................................................17
8.2.4
On-Die Termination (ODT) ...............................................................................................18
8.2.5
ODT related timings .........................................................................................................18
8.2.5.1
MRS command to ODT update delay .....................................................................18
8.3
Command Function.............................................................................................................................20
8.3.1
Bank Activate Command..................................................................................................20
8.3.2
Read Command ...............................................................................................................20
8.3.3
Write Command ...............................................................................................................21
8.3.4
Burst Read with Auto-precharge Command.....................................................................21
8.3.5
Burst Write with Auto-precharge Command .....................................................................21
8.3.6
Precharge All Command ..................................................................................................21
8.3.7
Self Refresh Entry Command ..........................................................................................21
8.3.8
Self Refresh Exit Command .............................................................................................22
8.3.9
Refresh Command ...........................................................................................................22
8.3.10
No-Operation Command ..................................................................................................23
8.3.11
Device Deselect Command..............................................................................................23
8.4
Read and Write access modes ...........................................................................................................23
8.4.1
Posted CAS ....................................................................................................................23


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