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Numéro de référence | W972GG8JB | ||
Description | 32M X 8 BANKS X 8 BIT DDR2 SDRAM | ||
Fabricant | Winbond | ||
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1 Page
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W972GG8JB
32M 8 BANKS 8 BIT DDR2 SDRAM
Table of Contents-
1. GENERAL DESCRIPTION ...................................................................................................................4
2. FEATURES ...........................................................................................................................................4
3. KEY PARAMETERS .............................................................................................................................5
4. BALL CONFIGURATION ......................................................................................................................6
5. BALL DESCRIPTION............................................................................................................................7
6. BLOCK DIAGRAM ................................................................................................................................8
7. FUNCTIONAL DESCRIPTION..............................................................................................................9
7.1 Power-up and Initialization Sequence ...................................................................................................9
7.2 Mode Register and Extended Mode Registers Operation ...................................................................10
7.2.1
Mode Register Set Command (MRS)...............................................................................10
7.2.2
Extend Mode Register Set Commands (EMRS) ..............................................................11
7.2.2.1
7.2.2.2
Extend Mode Register Set Command (1), EMR (1)................................................11
DLL Enable/Disable................................................................................................12
7.2.2.3
Extend Mode Register Set Command (2), EMR (2)................................................13
7.2.2.4
Extend Mode Register Set Command (3), EMR (3)................................................14
7.2.3
Off-Chip Driver (OCD) Impedance Adjustment ................................................................15
7.2.3.1
Extended Mode Register for OCD Impedance Adjustment ....................................16
7.2.3.2
7.2.3.3
OCD Impedance Adjust..........................................................................................16
Drive Mode .............................................................................................................17
7.2.4
On-Die Termination (ODT)...............................................................................................18
7.2.5
ODT related timings .........................................................................................................18
7.2.5.1
MRS command to ODT update delay.....................................................................18
7.3 Command Function.............................................................................................................................20
7.3.1
Bank Activate Command..................................................................................................20
7.3.2
Read Command ...............................................................................................................21
7.3.3
7.3.4
Write Command ...............................................................................................................21
Burst Read with Auto-precharge Command.....................................................................21
7.3.5
7.3.6
7.3.7
Burst Write with Auto-precharge Command.....................................................................21
Precharge All Command ..................................................................................................21
Self Refresh Entry Command ..........................................................................................21
7.3.8
Self Refresh Exit Command.............................................................................................22
7.3.9
7.3.10
Refresh Command ...........................................................................................................22
No-Operation Command ..................................................................................................23
7.3.11
Device Deselect Command..............................................................................................23
7.4 Read and Write access modes ...........................................................................................................23
7.4.1
Posted CAS ....................................................................................................................23
7.4.1.1
Examples of posted CAS operation .....................................................................23
Publication Release Date: Feb. 18, 2011
- 1 - Revision A02
Datasheet pdf - http://www.DataSheet4U.net/
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Pages | Pages 30 | ||
Télécharger | [ W972GG8JB ] |
No | Description détaillée | Fabricant |
W972GG8JB | 32M X 8 BANKS X 8 BIT DDR2 SDRAM | Winbond |
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