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M13L2561616A-2A Datasheet(PDF) 27 Page - Elite Semiconductor Memory Technology Inc.

Part No. M13L2561616A-2A
Description  Double-data-rate architecture, two data transfers per clock cycle
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Manufacturer  ESMT [Elite Semiconductor Memory Technology Inc.]
Direct Link  http://www.esmt.com.tw/index.asp
Logo ESMT - Elite Semiconductor Memory Technology Inc.

M13L2561616A-2A Datasheet(HTML) 27 Page - Elite Semiconductor Memory Technology Inc.

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ESMT
M13L2561616A (2A)
Elite Semiconductor Memory Technology Inc.
Publication Date : Sep. 2012
Revision : 1.0
27/49
Auto Refresh & Self Refresh
Auto Refresh
An auto refresh command is issued by having CS , RAS and CAS held low with CKE and WE high at the rising edge of
the clock (CLK). All banks must be precharged and idle for tRP(min) before the auto refresh command is applied. No control of
the external address pins is requires once this cycle has started because of the internal address counter. When the refresh
cycle has completed, all banks will be in the idle state. A delay between the auto refresh command and the next activate
command or subsequent auto refresh command must be greater than or equal to the tRFC(min).
A maximum of eight consecutive AUTO REFRESH commands (with tRFC(min)) can be posted to any given DDR SDRAM
meaning that the maximum absolute interval between any AUTO REFRESH command and the next AUTO REFRESH
command is 8 x tREFI .
CO M M A N D
CK E = Hi g h
t RP
PR E
Auto
Refresh
CM D
t RF C
CL K
CL K
Self Refresh
A self refresh command is defines by having CS , RAS , CAS and CKE held low with WE high at the rising edge of the
clock (CLK). Once the self refresh command is initiated, CKE must be held low to keep the device in self refresh mode. During
the self refresh operation, all inputs except CKE are ignored. Since CKE is an input, VREF must be maintained during self refresh.
The clock is internally disabled during self refresh operation to reduce power consumption. The self refresh is exited by
supplying stable clock input before returning CKE high, asserting deselect or NOP command and then asserting CKE high for
longer than tXSRD for locking of DLL.
CO M M A N D
CKE
t XSNR (m i n )
Self
Ref resh
Auto
Ref resh
NO P
t IS
CL K
CL K
NOP
NO P
NO P
NO P
NO P
t IS
Note: After self refresh exit, input an auto refresh command immediately.


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