W9425G6KH
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
PIN CONFIGURATION ..................................................................................................................................6
PIN 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
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
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10 Mode Register Operation .................................................................................................................14
8.10.1 Burst Length field (A2 to A0) ................................................................................................14
8.10.2 Addressing Mode Select (A3)...............................................................................................15
8.10.3 CAS Latency field (A6 to A4)................................................................................................16
8.10.4 DLL Reset bit (A8)................................................................................................................16
8.10.5 Mode Register /Extended Mode register change bits (BA0, BA1)........................................16
8.10.6 Extended Mode Register field ..............................................................................................16
8.10.7 Reserved field ......................................................................................................................16
OPERATION MODE ....................................................................................................................................17
9.
Publication Release Date: Nov. 17, 2014
Revision: A02
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