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W9425G6EH
4 M × 4 BANKS × 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
7.10.2 Addressing Mode Select (A3)...............................................................................................15
Publication Release Date:Dec. 03, 2008
-1-
Revision A08
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