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參數(shù)資料
| 型號： | W947D6HBHX5E |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | DRAM |
| 英文描述： | 8M X 16 DDR DRAM, 5 ns, PBGA60 |
| 封裝： | 8 X 9 MM, 0.80 MM PITCH, HALOGEN FREE AND LEAD FREE, VFBGA-60 |
| 文件頁數(shù)： | 40/60頁 |
| 文件大?。?/td> | 1160K |
| 代理商： | W947D6HBHX5E |
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W947D6HB / W947D2HB
128Mb Mobile LPDDR
Publication Release Date:Jun,17, 2011
- 45 -
Revision A01-003
7.14 Clock Stop
Stopping a clock during idle periods is an effective method of reducing power consumption.
The LPDDR SDRAM supports clock stop under the following conditions:
the last command (ACTIVE, READ, WRITE, PRECHARGE, AUTO REFRESH or MODE REGISTER SET) has
executed to completion, including any data-out during read bursts; the number of clock pulses per access
command depends on the devices AC timing parameters and the clock frequency;
the related timing conditions (tRCD, tWR, tRP, tRFC, tMRD) has been met;
CKE is held High
When all conditions have been met, the device is either in “idle state” or “row active state” and clock stop mode
may be entered with CK held Low and CK held High.
Clock stop mode is exited by restarting the clock. At least one NOP command has to be issued before the next
access command may be applied. Additional clock pulses might be required depending on the system
characteristics.
The following Figure shows clock stop mode entry and exit.
Initially the device is in clock stop mode
The clock is restarted with the rising edge of T0 and a NOP on the command inputs
With T1 a valid access command is latched; this command is followed by NOP commands in order to allow for
clock stop as soon as this access command is completed
Tn is the last clock pulse required by the access command latched with T1
The clock can be stopped after Tn
7.14.1 Clock Stop Mode Entry and Exit
Valid
NOP
CMD
NOP
Tn
T2
T1
T0
CK
CKE
Command
DQ,DQS
Timing
Condition
(High-Z)
= Don't Care
Enter Clock
Stop Mode
Valid
Command
Exit Clock
Stop
Mode
Clock
Stopped
Address
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| WMS128K8C-120FEIEA | 128K X 8 STANDARD SRAM, 120 ns, CDFP32 |
| WMS128K8L-100FEIE | 128K X 8 STANDARD SRAM, 100 ns, CDFP32 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W947D6HBHX5I | 制造商:WINBOND 制造商全稱:Winbond 功能描述:128Mb Mobile LPDDR |
| W947D6HBHX5I TR | 制造商:Winbond Electronics Corp 功能描述: |
| W947D6HBHX6E | 制造商:Winbond Electronics Corp 功能描述:IC LPDDR SDRAM 128MBIT 60VFBGA |
| W947D6HBHX6G | 制造商:WINBOND 制造商全稱:Winbond 功能描述:128Mb Mobile LPDDR |
| W948D2FB | 制造商:WINBOND 制造商全稱:Winbond 功能描述:256Mb Mobile LPDDR |
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