w9425g6eh Winbond Electronics Corp America, w9425g6eh Datasheet

w9425g6eh

Manufacturer Part Number

w9425g6eh

Description

4 M ? 4 Banks ? 16 Bits Ddr Sdram

Manufacturer

Winbond Electronics Corp America

Datasheet

1.W9425G6EH.pdf (53 pages)

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Table of Contents-

GENERAL DESCRIPTION............................................................................................................. 4

FEATURES .................................................................................................................................... 4

KEY PARAMETERS ...................................................................................................................... 5

PIN CONFIGURATION .................................................................................................................. 6

PIN DESCRIPTION........................................................................................................................ 7

BLOCK DIAGRAM ......................................................................................................................... 8

FUNCTIONAL DESCRIPTION....................................................................................................... 9

7.1

7.2

7.3

7.4

7.5

7.6

7.7

7.8

7.9

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

Power Up Sequence............................................................................................................ 9

Command Function ........................................................................................................... 10

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

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

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

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

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

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

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

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

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

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

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

Mode Register Set Command ..............................................................................................11

Extended Mode Register Set Command ..............................................................................11

4 M × 4 BANKS × 16 BITS DDR SDRAM

- 1 -

Publication Release Date:May 07, 2008

W9425G6EH

Revision A05

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