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W9725G6IB Dataheets PDF



Part Number W9725G6IB
Manufacturers winbond
Logo winbond
Description 4M X 4 BANKS X 16 BIT DDR2 SDRAM
Datasheet W9725G6IB DatasheetW9725G6IB Datasheet (PDF)

W9725G6IB 4M × 4 BANKS × 16 BIT DDR2 SDRAM Table of Contents- 1. GENERAL DESCRIPTION 4 2. FEATURES ....4 3. KEY PARAMETERS ...

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W9725G6IB 4M × 4 BANKS × 16 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 Extend Mode Register Set Command (1), EMR (1)................................................11 7.2.2.2 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 OCD Impedance Adjust ..........................................................................................16 7.2.3.3 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 ...............................................................................................................20 7.3.3 Write Command ...............................................................................................................21 7.3.4 Burst Read with Auto-precharge Command.....................................................................21 7.3.5 Burst Write with Auto-precharge Command .....................................................................21 7.3.6 Precharge All Command ..................................................................................................21 7.3.7 Self Refresh Entry Command ..........................................................................................21 7.3.8 Self Refresh Exit Command .............................................................................................22 7.3.9 Refresh Command ...........................................................................................................22 7.3.10 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: Oct. 23, 2009 - 1 - Revision A04 W9725G6IB 7.4.2 Burst mode operation..................................................


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