参数资料
型号: W9725G8JB-25I
厂商: WINBOND ELECTRONICS CORP
元件分类: DRAM
英文描述: DDR DRAM, PBGA84
封装: 8 X 12.50 MM, ROHS COMPLIANT, WBGA-84
文件页数: 9/86页
文件大小: 1462K
代理商: W9725G8JB-25I
W9725G8JB
Publication Release Date: Oct. 12, 2010
- 17 -
Revision A01
For proper operation of adjust mode, WL = RL - 1 = AL + CL - 1 clocks and tDS/tDH should be met as
shown in Figure 7. For input data pattern for adjustment, DT0 - DT3 is a fixed order and is not affected
by burst type (i.e., sequential or interleave).
OCD adjust mode
OCD calibration mode exit
WR
WL
DQS
tDS tDH
DT0
CLK
DQS_in
CMD
DQ_in
DM
NOP
EMRS
NOP
EMRS
CLK
DT1
DT2
DT3
Figure 7
– OCD Adjust Mode
7.2.3.3
Drive Mode
Drive mode, both Drive (1) and Drive (0), is used for controllers to measure DDR2 SDRAM Driver
impedance. In this mode, all outputs are driven out tOIT
after “enter drive mode” command and all
output drivers are turned-off tOIT
after “OCD calibration mode exit” command as shown in Figure 8.
Enter Drive mode
OCD calibration mode exit
EMRS
NOP
CLK
DQS
CMD
DQ
tOIT
DQs high for Drive (1)
DQs low for Drive (0)
DQS high & DQS low for Drive (1), DQS low & DQS high for Drive (0)
CLK
HI-Z
Figure 8
– OCD Drive Mode
相关PDF资料
PDF描述
W972GG8JB-25I 256M X 8 DDR DRAM, 0.4 ns, PBGA60
W972GG8JB-18 256M X 8 DDR DRAM, 0.35 ns, PBGA60
W9751G6JB-18 32M X 16 DDR DRAM, 0.35 ns, PBGA84
W981204AH-8H 32M X 4 SYNCHRONOUS DRAM, 6 ns, PDSO54
W981216BH75L 8M X 16 SYNCHRONOUS DRAM, 5.4 ns, PDSO54
相关代理商/技术参数
参数描述
W9725G8JB25ITR 制造商:Winbond Electronics Corp 功能描述:256M DDR2-800, X8, IND TEMP
W9725G8JB25TR 制造商:Winbond Electronics Corp 功能描述:256M DDR2-800, X8
W9725G8KB-18 制造商:Winbond Electronics 功能描述:IC MEMORY 制造商:Winbond Electronics Corp 功能描述:IC MEMORY
W9725G8KB-25 制造商:Winbond Electronics 功能描述:IC MEMORY 制造商:Winbond Electronics Corp 功能描述:IC MEMORY
W9725G8KB-25 TR 制造商:Winbond Electronics Corp 功能描述:256M DDR2-800, X8