W9425G8EH Datasheet, PDF (1/53 Pages) Winbond – 8M × 4 BANKS × 8 BITS DDR SDRAM

W9425G8EH
8M × 4 BANKS × 8 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: Jul. 04, 2008
-1-
Revision A01