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W9425G6DH

4M

脳

4 BANKS

脳

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 ............................................................................................................. 9

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 ........................................................................................................9

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

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

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

Write with Auto-precharge Command...................................................................................10

Read Command ...................................................................................................................10

Read with Auto-precharge Command ..................................................................................10

Mode Register Set Command ..............................................................................................10

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

7.4

7.5

7.6

7.7

7.8

7.9

7.10

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

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

Precharge .......................................................................................................................... 13

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

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

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

Input Clock Frequency Change during Precharge Power Down Mode ............................ 14

Mode Register Operation .................................................................................................. 14

7.10.1 Burst Length field (A2 to A0) ................................................................................................14

-1-

Publication Release Date:Nov. 20, 2007

Revision A7

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