W9425G6EH_0812 Datasheet, PDF (1/54 Pages) Winbond – 4 M × 4 BANKS × 16 BITS DDR SDRAM

W9425G6EH
4 M × 4 BANKS × 16 BITS DDR SDRAM
Table of Contents-
1. GENERAL DESCRIPTION.............................................................................................................................4
2. FEATURES ....................................................................................................................................................4
3. KEY PARAMETERS ......................................................................................................................................5
4. PIN CONFIGURATION ..................................................................................................................................6
5. PIN DESCRIPTION........................................................................................................................................7
6. BLOCK DIAGRAM .........................................................................................................................................8
7. FUNCTIONAL DESCRIPTION.......................................................................................................................9
7.1 Power Up Sequence ..........................................................................................................................9
7.2 Command Function ..........................................................................................................................10
7.2.1 Bank Activate Command ......................................................................................................10
7.2.2 Bank Precharge Command ..................................................................................................10
7.2.3 Precharge All Command ......................................................................................................10
7.2.4 Write Command ...................................................................................................................10
7.2.5 Write with Auto-precharge Command...................................................................................10
7.2.6 Read Command ...................................................................................................................10
7.2.7 Read with Auto-precharge Command ..................................................................................10
7.2.8 Mode Register Set Command ..............................................................................................11
7.2.9 Extended Mode Register Set Command ..............................................................................11
7.2.10 No-Operation Command ......................................................................................................11
7.2.11 Burst Read Stop Command..................................................................................................11
7.2.12 Device Deselect Command ..................................................................................................11
7.2.13 Auto Refresh Command .......................................................................................................11
7.2.14 Self Refresh Entry Command...............................................................................................12
7.2.15 Self Refresh Exit Command .................................................................................................12
7.2.16 Data Write Enable /Disable Command .................................................................................12
7.3 Read Operation ................................................................................................................................12
7.4 Write Operation ................................................................................................................................13
7.5 Precharge.........................................................................................................................................13
7.6 Burst Termination .............................................................................................................................13
7.7 Refresh Operation ............................................................................................................................13
7.8 Power Down Mode ...........................................................................................................................14
7.9 Input Clock Frequency Change during Precharge Power Down Mode ............................................14
7.10 Mode Register Operation .................................................................................................................14
7.10.1 Burst Length field (A2 to A0) ................................................................................................14
7.10.2 Addressing Mode Select (A3)...............................................................................................15
Publication Release Date:Dec. 03, 2008
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Revision A08