W9425G6JB
4 M 4 BANKS 16 BITS DDR SDRAM
Table of Contents-
1.
2.
3.
4.
5.
6.
7.
8.
GENERAL DESCRIPTION............................................................................................................. 4
FEATURES .................................................................................................................................... 4
ORDER INFORMATION ................................................................................................................ 4
KEY PARAMETERS ...................................................................................................................... 5
BALL CONFIGURATION ............................................................................................................... 6
BALL DESCRIPTION..................................................................................................................... 7
BLOCK DIAGRAM ......................................................................................................................... 8
FUNCTIONAL DESCRIPTION....................................................................................................... 9
8.1
8.2
Power Up Sequence............................................................................................................ 9
Command Function ........................................................................................................... 10
8.2.1 Bank Activate Command........................................................................................ 10
8.2.2 Bank Precharge Command .................................................................................... 10
8.2.3 Precharge All Command ........................................................................................ 10
8.2.4 Write Command...................................................................................................... 10
8.2.5 Write with Auto-precharge Command .................................................................... 10
8.2.6 Read Command...................................................................................................... 10
8.2.7 Read with Auto-precharge Command .................................................................... 10
8.2.8 Mode Register Set Command ................................................................................ 11
8.2.9 Extended Mode Register Set Command................................................................ 11
8.2.10 No-Operation Command ........................................................................................ 11
8.2.11 Burst Read Stop Command.................................................................................... 11
8.2.12 Device Deselect Command.................................................................................... 11
8.2.13 Auto Refresh Command......................................................................................... 11
8.2.14 Self Refresh Entry Command................................................................................. 12
8.2.15 Self Refresh Exit Command ................................................................................... 12
8.2.16 Data Write Enable /Disable Command................................................................... 12
8.3
8.4
8.5
8.6
8.7
8.8
8.9
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
Publication Release Date: Oct. 04, 2012
- 1 -
Revision A03
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