Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

W9725G6KB25A Datasheet(PDF) 27 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) 27 Page - Winbond

Back Button W9725G6KB25A Datasheet HTML 23Page - Winbond W9725G6KB25A Datasheet HTML 24Page - Winbond W9725G6KB25A Datasheet HTML 25Page - Winbond W9725G6KB25A Datasheet HTML 26Page - Winbond W9725G6KB25A Datasheet HTML 27Page - Winbond W9725G6KB25A Datasheet HTML 28Page - Winbond W9725G6KB25A Datasheet HTML 29Page - Winbond W9725G6KB25A Datasheet HTML 30Page - Winbond W9725G6KB25A Datasheet HTML 31Page - Winbond Next Button
Zoom Inzoom in Zoom Outzoom out
 27 / 87 page
background image
W9725G6KB
Publication Release Date: Sep. 03, 2012
- 27 -
Revision A03
8.6
Precharge operation
The Precharge Command is used to precharge or close a bank that has been activated. The
Precharge Command can be used to precharge each bank independently or all banks simultaneously.
Three address bits A10, BA0 and BA1 are used to define which bank to precharge when the
command is issued.
Table 4
– Bank selection for precharge by address bits
A10
BA1
BA0
Precharge Bank(s)
LOW
LOW
LOW
Bank 0 only
LOW
LOW
HIGH
Bank 1 only
LOW
HIGH
LOW
Bank 2 only
LOW
HIGH
HIGH
Bank 3 only
HIGH
Don
‟t Care
Don
‟t Care
All Banks
8.6.1
Burst read operation followed by precharge
Minimum Read to Precharge command spacing to the same bank = AL + BL/2 + max(RTP, 2) - 2 clks
For the earliest possible precharge, the precharge command may be issued on the rising edge which
is “Additive Latency (AL) + BL/2 + max(RTP, 2) - 2 clocks” after a Read command. A new bank active
(command) may be issued to the same bank after the RAS precharge time (tRP). A precharge
command cannot be issued until tRAS is satisfied.
The minimum Read to Precharge spacing has also to satisfy a minimum analog time from the rising
clock edge that initiates the last 4-bit prefetch of a Read to Precharge command. This time is called
tRTP (Read to Precharge). For BL = 4 this is the time from the actual read (AL after the Read
command) to Precharge command. For BL = 8 this is the time from AL + 2 clocks after the Read to the
Precharge command. (Example timing waveforms refer to 11.15 to 11.19 Burst read operation
followed by precharge diagram in Chapter 11)
8.6.2
Burst write operation followed by precharge
Minimum Write to Precharge Command spacing to the same bank = WL + BL/2 clks + tWR
For write cycles, a delay must be satisfied from the completion of the last burst write cycle until the
Precharge Command can be issued. This delay is known as a write recovery time (tWR) referenced
from the completion of the burst write to the precharge command. No Precharge command should be
issued prior to the tWR delay. (Example timing waveforms refer to 11.20 to 11.21 Burst write operation
followed by precharge diagram in Chapter 11)
8.7
Auto-precharge operation
Before a new row in an active bank can be opened, the active bank must be precharged using either
the Precharge command or the Auto-precharge function. When a Read or a Write command is given
to the DDR2 SDRAM, the CAS timing accepts one extra address, column address A10, to allow the
active bank to automatically begin precharge at the earliest possible moment during the burst read or
write cycle. If A10 is LOW when the READ or WRITE command is issued, then normal Read or Write
burst operation is executed and the bank remains active at the completion of the burst sequence. If
A10 is HIGH when the Read or Write command is issued, then the Auto-precharge function is
engaged. During Auto-precharge, a Read command will execute as normal with the exception that the
active bank will begin to precharge on the rising edge which is CAS Latency (CL) clock cycles before
the end of the read burst.


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