W9425G6EH Datasheet, PDF (1/50 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
Publication Release Date:Apr. 11, 2008
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Revision A04