Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

W9725G6KB25A Datasheet(PDF) 10 Page - Winbond

Part # W9725G6KB25A
Description  DLL aligns DQ and DQS transitions with clock, Data masks (DM) for write data, Write Data Mask
Download  87 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W9725G6KB25A Datasheet(HTML) 10 Page - Winbond

Back Button W9725G6KB25A Datasheet HTML 6Page - Winbond W9725G6KB25A Datasheet HTML 7Page - Winbond W9725G6KB25A Datasheet HTML 8Page - Winbond W9725G6KB25A Datasheet HTML 9Page - Winbond W9725G6KB25A Datasheet HTML 10Page - Winbond W9725G6KB25A Datasheet HTML 11Page - Winbond W9725G6KB25A Datasheet HTML 12Page - Winbond W9725G6KB25A Datasheet HTML 13Page - Winbond W9725G6KB25A Datasheet HTML 14Page - Winbond Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 87 page
background image
W9725G6KB
Publication Release Date: Sep. 03, 2012
- 10 -
Revision A03
Notes:
1. To guarantee ODT off, VREF must be valid and a LOW level must be applied to the ODT pin.
2. VREF must be within
 300 mV with respect to VDDQ/2 during supply ramp time.
3. VDD/VDDL voltage ramp time must be no greater than 200 mS from when VDD ramps from 300 mV to VDD min.
4. The VDDQ voltage ramp time from when VDD min is achieved on VDD to when VDDQ min is achieved on VDDQ must be no
greater than 500 mS
tCH tCL
tIS
tIS
400nS
NOP
PRE
ALL
EMRS
MRS
PRE
ALL
REF
MRS
REF
EMRS
EMRS
ANY
CMD
tRP
tMRD
tMRD
tRP
tRFC
tRFC
tOIT
Follow OCD
Flow chart
OCD
CAL. Mode
Exit
OCD
Default
min 200 Cycle
DLL
Reset
DLL
Enable
CLK
CLK
CKE
Command
ODT
tMRD
Figure 1
– Initialization sequence after power-up
8.2
Mode Register and Extended Mode Registers Operation
For application flexibility, burst length, burst type, CAS Latency, DLL reset function, write recovery
time (WR) are user defined variables and must be programmed with a Mode Register Set (MRS)
command. Additionally, DLL disable function, driver impedance, additive CAS Latency, ODT (On Die
Termination), single-ended strobe and OCD (off chip driver impedance adjustment) are also user
defined variables and must be programmed with an Extended Mode Register Set (EMRS) command.
Contents of the Mode Register (MR) or Extended Mode Registers EMR (1), EMR (2) and EMR (3) can
be altered by re-executing the MRS or EMRS Commands. Even if the user chooses to modify only a
subset of the MR or EMR (1), EMR (2) and EMR (3) variables, all variables within the addressed
register must be redefined when the MRS or EMRS commands are issued.
MRS, EMRS and Reset DLL do not affect array contents, which mean re-initialization including those
can be executed at any time after power-up without affecting array contents.
8.2.1
Mode Register Set Command (MRS)
( CS = "L", RAS = "L", CAS = "L", WE = "L", BA0 = "L", BA1 = "L", A0 to A12 = Register Data)
The mode register stores the data for controlling the various operating modes of DDR2 SDRAM. It
programs CAS Latency, burst length, burst sequence, test mode, DLL reset, Write Recovery (WR) and
various vendor specific options to make DDR2 SDRAM useful for various applications. The default
value in the Mode Register after power-up is not defined, therefore the Mode Register must be
programmed during initialization for proper operation.
The DDR2 SDRAM should be in all bank precharge state with CKE already HIGH prior to writing into
the mode register. The mode register set command cycle time (tMRD) is required to complete the write
operation to the mode register. The mode register contents can be changed using the same command
and clock cycle requirements during normal operation as long as all banks are in the precharge state.
The mode register is divided into various fields depending on functionality. Burst length is defined by
A[2:0] with options of 4 and 8 bit burst lengths. The burst length decodes are compatible with DDR


Similar Part No. - W9725G6KB25A

ManufacturerPart #DatasheetDescription
logo
Winbond
W9725G6KB25I-TR WINBOND-W9725G6KB25I-TR Datasheet
1Mb / 87P
   4M X 4 BANKS X 16 BIT DDR2 SDRAM
More results

Similar Description - W9725G6KB25A

ManufacturerPart #DatasheetDescription
logo
Winbond
W971GG6JB25I WINBOND-W971GG6JB25I Datasheet
1Mb / 87P
   DLL aligns DQ and DQS transitions with clock, Auto Refresh and Self Refresh modes, Write Data Mask
logo
Alliance Semiconductor ...
AS4C4M32D1A-5BIN ALSC-AS4C4M32D1A-5BIN Datasheet
2Mb / 64P
   DLL aligns DQ and DQS transitions
logo
ATMEL Corporation
AT24C16A ATMEL-AT24C16A_14 Datasheet
257Kb / 20P
   Write Protect Pin for Hardware Data Protection
AT24C32A ATMEL-AT24C32A_14 Datasheet
228Kb / 18P
   Write Protect Pin for Hardware Data Protection
AT24HC04B ATMEL-AT24HC04B_14 Datasheet
706Kb / 18P
   Write Protect Pin for Hardware Data Protection
AT24C04AN-10SU-1.8 ATMEL-AT24C04AN-10SU-1.8 Datasheet
194Kb / 21P
   Write Protect Pin for Hardware Data Protection
logo
Integrated Silicon Solu...
IS43LR16800G ISSI-IS43LR16800G Datasheet
1Mb / 43P
   DM for write masking only
logo
ATMEL Corporation
AT24C02A ATMEL-AT24C02A_14 Datasheet
563Kb / 16P
   Write Protect Pin for Hardware Data Protection
AT24C128 ATMEL-AT24C128_14 Datasheet
149Kb / 17P
   Write Protect Pin for Hardware and Software Data Protection
AT24C256 ATMEL-AT24C256_14 Datasheet
149Kb / 17P
   Write Protect Pin for Hardware and Software Data Protection
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com