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Winbond - 4M X 4 BANKS X 16 BITS DDR SDRAM

Numéro de référence W9425G6DH
Description 4M X 4 BANKS X 16 BITS DDR SDRAM
Fabricant Winbond 
Logo Winbond 





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W9425G6DH fiche technique
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W9425G6DH
4M × 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 ............................................................................................................. 9
7.2.1 Bank Activate Command ........................................................................................................9
7.2.2 Bank Precharge Command ....................................................................................................9
7.2.3 Precharge All Command ........................................................................................................9
7.2.4 Write Command .....................................................................................................................9
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 ..............................................................................................10
7.2.9 Extended Mode Register Set Command ..............................................................................10
7.2.10 No-Operation Command ......................................................................................................10
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...............................................................................................11
7.2.15 Self Refresh Exit Command .................................................................................................11
7.2.16 Data Write Enable /Disable Command .................................................................................12
7.3 Read Operation ................................................................................................................. 12
7.4 Write Operation ................................................................................................................. 12
7.5 Precharge .......................................................................................................................... 13
7.6 Burst Termination .............................................................................................................. 13
7.7 Refresh Operation ............................................................................................................. 13
7.8 Power Down Mode ............................................................................................................ 13
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:Nov. 20, 2007
- 1 - Revision A7

PagesPages 53
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