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M13S128324A-5BG Datasheet(PDF) 9 Page - Elite Semiconductor Memory Technology Inc.

Part # M13S128324A-5BG
Description  1M x 32 Bit x 4 Banks Double Data Rate SDRAM
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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.

M13S128324A-5BG Datasheet(HTML) 9 Page - Elite Semiconductor Memory Technology Inc.

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ESMT
M13S128324A
Elite Semiconductor Memory Technology Inc.
Publication Date : Jul. 2009
Revision : 2.3
9/50
Basic Functionality
Power-Up and Initialization Sequence
The following sequence is required for POWER UP and Initialization.
1. Apply power and attempt to maintain CKE at a low state (all other inputs may be undefined.)
-
Apply VDD before or at the same time as VDDQ.
-
Apply VDDQ before or at the same time as VTT & VREF).
2. Start clock and maintain stable condition for a minimun of 200us.
3. The minimun of 200us after stable power and clock (CLK, CLK ), apply NOP & take CKE high.
4. Issue precharge commands for all banks of the device.
*1
5. Issue EMRS to enable DLL. (To issue “DLL Enable” command, provide “Low” to A0, “High” to BA0 and “Low” to all of
the rest address pins, A1~A11 and BA1)
*1
6. Issue a mode register set command for “DLL reset”. The additional 200 cycles of clock input is required to lock the DLL.
(To issue DLL reset command, provide “High” to A8 and “Low” to BA0)
*2
7. Issue precharge commands for all banks of the device.
8. Issue 2 or more auto-refresh commands.
9. Issue a mode register set command with low to A8 to initialize device operation.
*1 Every “DLL enable” command resets DLL. Therefore sequence 6 can be skipped during power up. Instead of it, the
additional 200 cycles of clock input is required to lock the DLL after enabling DLL.
*2 Sequence of 6 & 7 is regardless of the order.
* When the operating frequency is changed, DLL reset should be required again.
After DLL reset again, the minimum 200 cycles of clock input is needed to lock the DLL.
CL K
CL K
Co m m a n d
0
1
2
3
4
5
6
7
8
9
1011
1213
14
1516
17
1819
t RP
pr ec h a r g e
Al l B a n k s
EM R S
MR S
Dll R e s e t
t RP
pr e c ha r g e
Al l B a n k s
1s t A u t o
Re f r e s h
t RF C
2n d
Aut o
Re f r e s h
t RF C
Mo de
Reg ist er S e t
An y
Co m m a n d
mi n . 2 0 0 C y c l e
Po w e r u p & I n it iali za t i on S eque nce
t MR D
t MR D
t MR D


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