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W9725G6IB Datasheet Preview

W9725G6IB Datasheet

4M X 4 BANKS X 16 BIT DDR2 SDRAM

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W9725G6IB
4M × 4 BANKS × 16 BIT DDR2 SDRAM
Table of Contents-
1. GENERAL DESCRIPTION ...................................................................................................................4
2. FEATURES ...........................................................................................................................................4
3. KEY PARAMETERS .............................................................................................................................5
4. BALL CONFIGURATION ......................................................................................................................6
5. BALL DESCRIPTION............................................................................................................................7
6. BLOCK DIAGRAM ................................................................................................................................8
7. FUNCTIONAL DESCRIPTION..............................................................................................................9
7.1 Power-up and Initialization Sequence ...................................................................................................9
7.2 Mode Register and Extended Mode Registers Operation ...................................................................10
7.2.1
Mode Register Set Command (MRS)...............................................................................10
7.2.2
Extend Mode Register Set Commands (EMRS) ..............................................................11
7.2.2.1
Extend Mode Register Set Command (1), EMR (1)................................................11
7.2.2.2
DLL Enable/Disable................................................................................................12
7.2.2.3
Extend Mode Register Set Command (2), EMR (2)................................................13
7.2.2.4
Extend Mode Register Set Command (3), EMR (3)................................................14
7.2.3
Off-Chip Driver (OCD) Impedance Adjustment ................................................................15
7.2.3.1
Extended Mode Register for OCD Impedance Adjustment ....................................16
7.2.3.2
OCD Impedance Adjust ..........................................................................................16
7.2.3.3
Drive Mode .............................................................................................................17
7.2.4
On-Die Termination (ODT)...............................................................................................18
7.2.5
ODT related timings .........................................................................................................18
7.2.5.1
MRS command to ODT update delay.....................................................................18
7.3 Command Function.............................................................................................................................20
7.3.1
Bank Activate Command..................................................................................................20
7.3.2
Read Command ...............................................................................................................20
7.3.3
Write Command ...............................................................................................................21
7.3.4
Burst Read with Auto-precharge Command.....................................................................21
7.3.5
Burst Write with Auto-precharge Command .....................................................................21
7.3.6
Precharge All Command ..................................................................................................21
7.3.7
Self Refresh Entry Command ..........................................................................................21
7.3.8
Self Refresh Exit Command .............................................................................................22
7.3.9
Refresh Command ...........................................................................................................22
7.3.10
No-Operation Command ..................................................................................................23
7.3.11
Device Deselect Command..............................................................................................23
7.4 Read and Write access modes ...........................................................................................................23
7.4.1
Posted CAS ....................................................................................................................23
7.4.1.1
Examples of posted CAS operation......................................................................23
Publication Release Date: Oct. 23, 2009
- 1 - Revision A04




winbond

W9725G6IB Datasheet Preview

W9725G6IB Datasheet

4M X 4 BANKS X 16 BIT DDR2 SDRAM

No Preview Available !

W9725G6IB
7.4.2
Burst mode operation.......................................................................................................24
7.4.3
Burst read mode operation...............................................................................................25
7.4.4
Burst write mode operation ..............................................................................................25
7.4.5
Write data mask ...............................................................................................................26
7.5 Burst Interrupt .....................................................................................................................................26
7.6 Precharge operation............................................................................................................................27
7.6.1
Burst read operation followed by precharge.....................................................................27
7.6.2
Burst write operation followed by precharge ....................................................................27
7.7 Auto-precharge operation ...................................................................................................................27
7.7.1
Burst read with Auto-precharge........................................................................................28
7.7.2
Burst write with Auto-precharge .......................................................................................28
7.8 Refresh Operation...............................................................................................................................29
7.9 Power Down Mode..............................................................................................................................29
7.9.1
Power Down Entry ...........................................................................................................30
7.9.2
Power Down Exit..............................................................................................................30
7.10 Input clock frequency change during precharge power down .............................................................30
8. OPERATION MODE ...........................................................................................................................31
8.1 Command Truth Table ........................................................................................................................31
8.2 Clock Enable (CKE) Truth Table for Synchronous Transitions............................................................32
8.3 Data Mask (DM) Truth Table...............................................................................................................32
8.4 Function Truth Table ...........................................................................................................................33
8.5 Simplified Stated Diagram...................................................................................................................36
9. ELECTRICAL CHARACTERISTICS ...................................................................................................37
9.1 Absolute Maximum Ratings.................................................................................................................37
9.2 Operating Temperature Condition.......................................................................................................37
9.3 Recommended DC Operating Conditions ...........................................................................................37
9.4 ODT DC Electrical Characteristics ......................................................................................................38
9.5 Input DC Logic Level...........................................................................................................................38
9.6 Input AC Logic Level ...........................................................................................................................38
9.7 Capacitance ........................................................................................................................................39
9.8 Leakage and Output Buffer Characteristics ........................................................................................39
9.9 DC Characteristics ..............................................................................................................................40
9.9.1
DC Characteristics for -25/-3 speed grades .....................................................................40
9.10 IDD Measurement Test Parameters....................................................................................................42
9.11 AC Characteristics ..............................................................................................................................43
9.12 AC Input Test Conditions ....................................................................................................................63
9.13 Differential Input/Output AC Logic Levels ...........................................................................................63
9.14 AC Overshoot / Undershoot Specification ...........................................................................................64
9.14.1
AC Overshoot / Undershoot Specification for Address and Control Pins: ........................64
9.14.2
AC Overshoot / Undershoot Specification for Clock, Data, Strobe and Mask pins:..........64
10.
10.1
10.2
TIMING WAVEFORMS .......................................................................................................................65
Command Input Timing.......................................................................................................................65
Timing of the CLK Signals...................................................................................................................65
Publication Release Date: Oct. 23, 2009
- 2 - Revision A04


Part Number W9725G6IB
Description 4M X 4 BANKS X 16 BIT DDR2 SDRAM
Maker winbond
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