AS4SD4M16DG-10SLASHIT datasheet(3/50 Pages) AUSTIN

3 / 50 page

SDRAM

AS4SD4M16

Rev. 2.1 6/05

Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.

Austin Semiconductor, Inc.

TABLE OF CONTENTS

Functional Block Diagram - 4 Meg x 16 ........................................ 4

Pin Descriptions ............................................................................. 5

Functional Description ................................................................. 6

Initialization ............................................................................. 6

Mode Register ................................................................ 6

Burst Length ................................................................... 6

Burst Type ....................................................................... 7

CAS Latency ................................................................... 8

Operating Mode ............................................................. 8

Write Burst Mode .......................................................... 8

Commands ....................................................................................... 9

Truth Table 1 (Commands and DQM Operation) ...

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

Command Inhibit .................................................................... 10

No Operation (NOP) .................................................................10

Load Mode Register ............................................................. 10

Active ....................................................................................... 10

Read .......................................................................................... 10

Write ......................................................................................... 10

Precharge ................................................................................. 10

Auto Precharge ...................................................................... 10

Burst Terminate ...................................................................... 11

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

Self Refresh ............................................................................. 11

Operation ..................................................................................... 12

Bank/Row Activation ............................................................ 12

Reads ........................................................................................ 13

Writes ....................................................................................... 19

Precharge................................................................................... 21

Power-Down...............................................................................21

Clock Suspend......................................................................... 22

Burst Read/Single Write ...........................................................22

Concurrent Auto Precharge ................................................. 23

Truth Table 2 (CKE) ......................................................................2

Truth Table 3 (Current State, Same Bank) .........................

........ 26

Truth Table 4 (Current State, Different Bank) ...........................

Absolute Maximum Ratings ........................................................ 30

DC Electrical Characteristics and Operating Conditions......... 30

ICC Specifications and Conditions .............................................. 30

Capacitance ..................................................................................... 31

AC Electrical Characteristics (Timing Table) ............................31

Timing Waveforms

Initialize and Load Mode Register ..................................... 34

Power-Down Mode ................................................................ 35

Clock Suspend Mode ........................................................... 36

Auto Refresh Mode .............................................................. 37

Self Refresh Mode ................................................................. 38

Reads

Read - Without Auto Precharge ................................. 39

Read - With Auto Precharge ....................................... 40

Alternating Bank Read Accesses .............................. 41

Read - Full-Page Burst ......................................................... 42

Read - DQM Operation ................................................ 43

Writes

Write - Without Auto Precharge ................................ 44

Write - With Auto Precharge ...................................... 45

Alternating Bank Write Accesses .............................. 46

Write - Full-Page Burst ................................................. 47

Write - DQM Operation ............................................... 48

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