W9425G6DH Ver la hoja de datos (PDF) - Winbond

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W9425G6DH

4M × 4 BANKS × 16 BITS DDR SDRAM

Winbond 

W9425G6DH

4M × 4 BANKS × 16 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 ............................................................................................................. 9

7.2.1 Bank Activate Command ........................................................................................................9

7.2.2 Bank Precharge Command ....................................................................................................9

7.2.3 Precharge All Command ........................................................................................................9

7.2.4 Write Command .....................................................................................................................9

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 ..............................................................................................10

7.2.9 Extended Mode Register Set Command ..............................................................................10

7.2.10 No-Operation Command ......................................................................................................10

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...............................................................................................11

7.2.15 Self Refresh Exit Command .................................................................................................11

7.2.16 Data Write Enable /Disable Command .................................................................................12

7.3 Read Operation ................................................................................................................. 12

7.4 Write Operation ................................................................................................................. 12

7.5 Precharge .......................................................................................................................... 13

7.6 Burst Termination .............................................................................................................. 13

7.7 Refresh Operation ............................................................................................................. 13

7.8 Power Down Mode ............................................................................................................ 13

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:Nov. 20, 2007

-1-

Revision A7

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