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W9425G6EH Datasheet

  • W9425G6EH

  • 4 M 】 4 BANKS 】 16 BITS DDR SDRAM

  • 50頁(yè)

  • WINBOND

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W9425G6EH
4 M
脳
4 BANKS
脳
16 BITS DDR SDRAM
Table of Contents-
1.
2.
3.
4.
5.
6.
7.
GENERAL DESCRIPTION............................................................................................................. 4
FEATURES .................................................................................................................................... 4
KEY PARAMETERS ...................................................................................................................... 5
PIN CONFIGURATION .................................................................................................................. 6
PIN DESCRIPTION........................................................................................................................ 7
BLOCK DIAGRAM ......................................................................................................................... 8
FUNCTIONAL DESCRIPTION....................................................................................................... 9
7.1
7.2
Power Up Sequence............................................................................................................ 9
Command Function ........................................................................................................... 10
7.2.1
7.2.2
7.2.3
7.2.4
7.2.5
7.2.6
7.2.7
7.2.8
7.2.9
Bank Activate Command ......................................................................................................10
Bank Precharge Command ..................................................................................................10
Precharge All Command ......................................................................................................10
Write Command ...................................................................................................................10
Write with Auto-precharge Command...................................................................................10
Read Command ...................................................................................................................10
Read with Auto-precharge Command ..................................................................................10
Mode Register Set Command ..............................................................................................11
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
7.4
7.5
7.6
7.7
7.8
7.9
7.10
Read Operation ................................................................................................................. 12
Write Operation ................................................................................................................. 13
Precharge .......................................................................................................................... 13
Burst Termination .............................................................................................................. 13
Refresh Operation ............................................................................................................. 13
Power Down Mode ............................................................................................................ 14
Input Clock Frequency Change during Precharge Power Down Mode ............................ 14
Mode Register Operation .................................................................................................. 14
7.10.1 Burst Length field (A2 to A0) ................................................................................................14
-1-
Publication Release Date:Apr. 11, 2008
Revision A04

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