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Winbond

W972GG8KB Datasheet Preview

W972GG8KB Datasheet

32M x 8-BANKS x 8-BIT DDR2 SDRAM

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W972GG8KB
32M 8 BANKS 8 BIT DDR2 SDRAM
Table of Contents-
1. GENERAL DESCRIPTION ...................................................................................................................4
2. FEATURES ...........................................................................................................................................4
3. ORDER INFORMATION .......................................................................................................................4
4. KEY PARAMETERS .............................................................................................................................5
5. BALL CONFIGURATION ......................................................................................................................6
6. BALL DESCRIPTION............................................................................................................................7
7. BLOCK DIAGRAM ................................................................................................................................8
8. FUNCTIONAL DESCRIPTION..............................................................................................................9
8.1 Power-up and Initialization Sequence ...................................................................................................9
8.2 Mode Register and Extended Mode Registers Operation ...................................................................10
8.2.1
Mode Register Set Command (MRS)...............................................................................10
8.2.2
Extend Mode Register Set Commands (EMRS) ..............................................................11
8.2.2.1
Extend Mode Register Set Command (1), EMR (1)................................................11
8.2.2.2
DLL Enable/Disable................................................................................................12
8.2.2.3
Extend Mode Register Set Command (2), EMR (2)................................................13
8.2.2.4
Extend Mode Register Set Command (3), EMR (3)................................................14
8.2.3
Off-Chip Driver (OCD) Impedance Adjustment ................................................................15
8.2.3.1
Extended Mode Register for OCD Impedance Adjustment ....................................16
8.2.3.2
OCD Impedance Adjust ..........................................................................................16
8.2.3.3
Drive Mode .............................................................................................................17
8.2.4
On-Die Termination (ODT)...............................................................................................18
8.2.5
ODT related timings .........................................................................................................18
8.2.5.1
MRS command to ODT update delay.....................................................................18
8.3 Command Function.............................................................................................................................20
8.3.1
Bank Activate Command..................................................................................................20
8.3.2
Read Command ...............................................................................................................21
8.3.3
Write Command ...............................................................................................................21
8.3.4
Burst Read with Auto-precharge Command.....................................................................21
8.3.5
Burst Write with Auto-precharge Command .....................................................................21
8.3.6
Precharge All Command ..................................................................................................21
8.3.7
Self Refresh Entry Command ..........................................................................................21
8.3.8
Self Refresh Exit Command .............................................................................................22
8.3.9
Refresh Command ...........................................................................................................22
8.3.10
No-Operation Command ..................................................................................................23
8.3.11
Device Deselect Command..............................................................................................23
8.4 Read and Write access modes ...........................................................................................................23
8.4.1
Posted CAS ...................................................................................................................23
8.4.1.1
Examples of posted CAS operation .....................................................................23
8.4.2
Burst mode operation.......................................................................................................24
8.4.3
Burst read mode operation...............................................................................................25
8.4.4
Burst write mode operation ..............................................................................................25
8.4.5
Write data mask ...............................................................................................................26
8.5 Burst Interrupt .....................................................................................................................................26
8.6 Precharge operation............................................................................................................................27
Publication Release Date: Nov. 30, 2015
Revision: A03
-1-




Winbond

W972GG8KB Datasheet Preview

W972GG8KB Datasheet

32M x 8-BANKS x 8-BIT DDR2 SDRAM

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W972GG8KB
8.6.1
Burst read operation followed by precharge.....................................................................27
8.6.2
Burst write operation followed by precharge ....................................................................27
8.7 Auto-precharge operation ...................................................................................................................27
8.7.1
Burst read with Auto-precharge........................................................................................28
8.7.2
Burst write with Auto-precharge .......................................................................................28
8.8 Refresh Operation...............................................................................................................................29
8.9 Power Down Mode..............................................................................................................................29
8.9.1
Power Down Entry ...........................................................................................................30
8.9.2
Power Down Exit..............................................................................................................30
8.10 Input clock frequency change during precharge power down .............................................................30
9.
9.1
9.2
9.3
9.4
9.5
OPERATION MODE ...........................................................................................................................31
Command Truth Table ........................................................................................................................31
Clock Enable (CKE) Truth Table for Synchronous Transitions............................................................32
Data Mask (DM) Truth Table...............................................................................................................32
Function Truth Table ...........................................................................................................................33
Simplified Stated Diagram...................................................................................................................36
10. ELECTRICAL CHARACTERISTICS ...................................................................................................37
10.1 Absolute Maximum Ratings ................................................................................................................37
10.2 Operating Temperature Condition.......................................................................................................37
10.3 Recommended DC Operating Conditions ...........................................................................................37
10.4 ODT DC Electrical Characteristics ......................................................................................................38
10.5 Input DC Logic Level...........................................................................................................................38
10.6 Input AC Logic Level ...........................................................................................................................38
10.7 Capacitance ........................................................................................................................................39
10.8 Leakage and Output Buffer Characteristics ........................................................................................39
10.9 DC Characteristics ..............................................................................................................................40
10.10
IDD Measurement Test Parameters ..........................................................................................42
10.11
AC Characteristics .....................................................................................................................43
10.11.1
AC Characteristics and Operating Condition for -18 speed grade ...................................43
10.11.2
AC Characteristics and Operating Condition for -25/25I/-3 speed grades........................45
10.12
10.13
10.14
AC Input Test Conditions...........................................................................................................66
Differential Input/Output AC Logic Levels ..................................................................................66
AC Overshoot / Undershoot Specification .................................................................................67
10.14.1
10.14.2
AC Overshoot / Undershoot Specification for Address and Control Pins: ........................67
AC Overshoot / Undershoot Specification for Clock, Data, Strobe and Mask pins:..........67
11.
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
11.10
11.11
11.12
11.13
11.14
TIMING WAVEFORMS .......................................................................................................................68
Command Input Timing.......................................................................................................................68
ODT Timing for Active/Standby Mode.................................................................................................69
ODT Timing for Power Down Mode ....................................................................................................69
ODT Timing mode switch at entering power down mode ....................................................................70
ODT Timing mode switch at exiting power down mode ......................................................................71
Data output (read) timing ....................................................................................................................72
Burst read operation: RL=5 (AL=2, CL=3, BL=4) ................................................................................72
Data input (write) timing ......................................................................................................................73
Burst write operation: RL=5 (AL=2, CL=3, WL=4, BL=4) ....................................................................73
Seamless burst read operation: RL = 5 ( AL = 2, and CL = 3, BL = 4) ......................................74
Seamless burst write operation: RL = 5 ( WL = 4, BL = 4).........................................................74
Burst read interrupt timing: RL =3 (CL=3, AL=0, BL=8) .............................................................75
Burst write interrupt timing: RL=3 (CL=3, AL=0, WL=2, BL=8) ..................................................75
Write operation with Data Mask: WL=3, AL=0, BL=4) ...............................................................76
Publication Release Date: Nov. 30, 2015
Revision: A03
-2-


Part Number W972GG8KB
Description 32M x 8-BANKS x 8-BIT DDR2 SDRAM
Maker Winbond
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