m52d128168a Elite Semiconductor Memory Technology Inc., m52d128168a Datasheet - Page 31

• Manufacturer Part Number: m52d128168a
• Description: 2m X 16 Bit X 4 Banks Mobile Synchronous Dram
• Manufacturer: Elite Semiconductor Memory Technology Inc.

Power Up Sequence
C L O C K
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.)
2. Start clock and maintain stable condition for a minimum.
3. The minimum of 200us after stable power and clock (CLK), apply NOP & take CKE high.
4. Issue precharge commands for all banks of the device.
5. Issue 2 or more auto-refresh commands.
6. Issue mode register set command to initialize the mode register.
7. Issue extended mode register set command to set PASR and DS.
Elite Semiconductor Memory Technology Inc.
A 1 0 / A P
-
-
A D D R
B A 1
B A 0
C K E
D Q M
C A S
W E
R A S
C S
D Q
Apply VDD before or at the same time as VDDQ
Apply VDDQ
( A l l B a n k s )
P r e c h a r g e
0
H i g h l e v e l i s n e c e s s a r y
H i g h l e v e l i s n e c e s s a r y
H i g h - Z
1
2
t
R P
A u t o R e f r e s h
3
4
5
6
t
R F C
7
8
A u t o R e f r e s h
9
10
11
12
t
R F C
13
14
M o d e R e g i s t e r S e t
15
Publication Date: Aug. 2009
Revision: 1.3
K e y
M52D128168A
16
E x t e n d e d M o d e
t
M R D
R e g i s t e r S e t
17
K e y
18
t
M R D
: D o n ' t c a r e
19
R o w A c t i v e
R A
B S
B S
R A
20
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