m52s128168a-7tig Elite Semiconductor Memory Technology Inc., m52s128168a-7tig Datasheet - Page 9

• Manufacturer Part Number: m52s128168a-7tig
• Description: 2m X 16 Bit X 4 Banks Synchronous Dram
• Manufacturer: Elite Semiconductor Memory Technology Inc.

ESMT
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.)
2. Start clock and maintain stable condition for a minimum.
3. The minimum of 200us after stable power and clock (CLK, 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.
C L O C K
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 V
( A l l B a n k s )
P r e c h a r g e
0
DD
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
before or at the same time as V
1
2
t
R P
A u t o R e f r e s h
3
4
5
6
Preliminary
t
R F C
DDQ.
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
Revision : 1.4
15
Publication Date : Sep. 2008
K e y
16
t
E x t e n d e d M o d e
M R D
R e g i s t e r S e t
17
M53D128168A
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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