收藏本站
W631GG6KB
8.4
No OPeration (NOP) Command
The No OPeration (NOP) command is used to instruct the selected DDR3 SDRAM to perform a NOP
(CS# LOW and RAS#, CAS#, and WE# HIGH). This prevents unwanted commands from being
registered during idle or wait states. Operations already in progress are not affected.
8.5
Deselect Command
The DESELECT function (CS# HIGH) prevents new commands from being executed by the DDR3
SDRAM. The DDR3 SDRAM is effectively deselected. Operations already in progress are not affected.
8.6
DLL-off Mode
DDR3 DLL- off mode is entered by setting MR1 bit A0 to ―1‖; this will disable the DLL for subsequent
operations until A0 bit is set back to ―0‖. The MR1 A0 bit for DLL control can be switched either during
initialization or later. Refer to section 8.8 “ Input clock frequency change ” on page 28.
The DLL-off Mode operations listed below are an optional feature for DDR3. The maximum clock
frequency for DLL-off Mode is specified by the parameter t CK(DLL_OFF) . There is no minimum
frequency limit besides the need to satisfy the refresh interval, t REFI .
Due to latency counter and timing restrictions, only one value of CAS Latency (CL) in MR0 and CAS
Write Latency (CWL) in MR2 are supported. The DLL-off mode is only required to support setting of
both CL=6 and CWL=6.
DLL-off mode will affect the Read data Clock to Data Strobe relationship (t DQSCK ), but not the Data
Strobe to Data relationship (t DQSQ , t QH ). Special attention is needed to line up Read data to controller
time domain.
Comparing with DLL-on mode, where t DQSCK starts from the rising clock edge (AL+CL) cycles after
the Read command, the DLL-off mode t DQSCK starts (AL+CL - 1) cycles after the read command.
Another difference is that t DQSCK may not be small compared to t CK (it might even be larger than t CK )
and the difference between t DQSCK min and t DQSCK max is significantly larger than in DLL-on mode.
The timing relations on DLL-off mode READ operation is shown in the following Timing Diagram
(CL=6, BL=8):
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
CK#
CK
Command
READ
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
Address
Bank
Col b
RL (DLL_on) = AL + CL = 6 (CL = 6, AL = 0)
CL = 6
DQS,DQS# (DLL_on)
DQ (DLL_on)
RL (DLL_off) = AL + ( CL – 1 ) = 5
Dout
b
Dout
b+1
Dout
b+2
Dout
b+3
Dout
b+4
Dout
b+5
Dout
b+6
Dout
b+7
t DQSCK ( DLL _off)_min
DQS,DQS# (DLL_off)
DQ (DLL_off)
Dout
b
Dout
b+1
Dout
b+2
Dout
b+3
Dout
b+4
Dout
b+5
Dout
b+6
Dout
b+7
t DQSCK ( DLL _on)_max
DQS,DQS# (DLL_off)
DQ (DLL_off)
Dout
b
Dout
b+1
Dout
b+2
Dout
b+3
Dout
b+4
Dout
b+5
Dout
b+6
Dout
b+7
Note:
The tDQSCK is used here for DQS, DQS# and DQ to have a simplified diagram;
the DLL_off shift will affect both timings in the same way and the skew between
all DQ, and DQS, DQS# signals will still be tDQSQ.
TRANSITIONING DATA
DON'T CARE
Figure 9 – DLL-off mode READ Timing Operation
Publication Release Date: Dec. 09, 2013
Revision A05
- 25 -
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
W9412G6IH-5 IC DDR-400 SDRAM 128MB 66TSSOPII
W9412G6JH-5I IC DDR SDRAM 128MBIT 66TSOPII
W9425G6EH-5 IC DDR-400 SDRAM 256MB 66TSSOPII
W9425G6JH-5I IC DDR SDRAM 256MBIT 66TSOPII
W947D2HBJX5E IC LPDDR SDRAM 128MBIT 90VFBGA
W948D2FBJX5E IC LPDDR SDRAM 256MBIT 90VFBGA
W949D2CBJX5E IC LPDDR SDRAM 512MBIT 90VFBGA
W971GG6JB25I IC DDR2 SDRAM 1GBIT 84WBGA
相关代理商/技术参数
W631GG8KB-11 制造商:Winbond Electronics Corp 功能描述:IC DDR3 SDRAM 1GBIT 制造商:Winbond Electronics Corp 功能描述:IC DDR3 SDRAM 1GBIT 78WBGA
W631GG8KB-12 制造商:Winbond Electronics Corp 功能描述:DRAM Chip DDR3 SDRAM 1G-Bit 128Mx8 1.5V 制造商:Winbond Electronics Corp 功能描述:IC DDR3 SDRAM 1GBIT 制造商:Winbond Electronics Corp 功能描述:IC DDR3 SDRAM 1GBIT 78WBGA
W631GG8KB-15 制造商:Winbond Electronics Corp 功能描述:IC DDR3 SDRAM 1GBIT 制造商:Winbond Electronics Corp 功能描述:IC DDR3 SDRAM 1GBIT 78WBGA
W632 制造商:LUMINIS 制造商全称:LUMINIS 功能描述:Wall mount
W632GG6KB-11 制造商:Winbond Electronics Corp 功能描述:IC DDR3 SDRAM 2GBIT 96WBGA
W632GG8KB-11 制造商:Winbond Electronics Corp 功能描述:IC DDR3 SDRAM 2GBIT 78WBGA
W634 制造商:LUMINIS 制造商全称:LUMINIS 功能描述:Wall mount
W638 制造商:LUMINIS 制造商全称:LUMINIS 功能描述:Wall mount