W9425G6EH データシートの表示（PDF） - Winbond

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W9425G6EH

4 M × 4 BANKS × 16 BITS DDR SDRAM

Winbond 

W9425G6EH

4 M × 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 ..........................................................................................................................10

7.2.1 Bank Activate Command ......................................................................................................10

7.2.2 Bank Precharge Command ..................................................................................................10

7.2.3 Precharge All Command ......................................................................................................10

7.2.4 Write Command ...................................................................................................................10

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

7.2.9 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 Read Operation ................................................................................................................................12

7.4 Write Operation ................................................................................................................................13

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

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

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

7.8 Power Down Mode ...........................................................................................................................14

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

7.10.2 Addressing Mode Select (A3)...............................................................................................15

Publication Release Date:Dec. 03, 2008

-1-

Revision A08

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