w9425g8eh Winbond Electronics Corp America, w9425g8eh Datasheet

w9425g8eh

Manufacturer Part Number

w9425g8eh

Description

8m ? 4 Banks ? 8 Bits Ddr Sdram

Manufacturer

Winbond Electronics Corp America

Datasheet

1.W9425G8EH.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

7.2.11

7.2.12

7.2.13

7.2.14

7.2.15

7.2.16

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

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

No-Operation Command ......................................................................................................11

Burst Read Stop Command..................................................................................................11

Device Deselect Command ..................................................................................................11

Auto Refresh Command .......................................................................................................11

Self Refresh Entry Command...............................................................................................12

Self Refresh Exit Command .................................................................................................12

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

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

8M × 4 BANKS × 8 BITS DDR SDRAM

- 1 -

Publication Release Date: Jul. 04

Revision A01

2008

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