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W972GG8JB25I Datasheet(PDF) 1 Page - Winbond |
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W972GG8JB25I Datasheet(HTML) 1 Page - Winbond |
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1 / 87 page  W972GG8JB 32M 8 BANKS 8 BIT DDR2 SDRAM Publication Release Date: Dec. 03, 2012 - 1 - Revision A03 Table of Contents- 1. GENERAL DESCRIPTION ...................................................................................................................4 2. FEATURES ...........................................................................................................................................4 3. ORDER INFORMATION .......................................................................................................................4 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 ...............................................................................................................21 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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