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ESMT
M12L64164A
Elite Semiconductor Memory Technology Inc.
Publication Date: May 2008
Revision: 3.3
18/46
BASIC FEATURE AND FUNCTION DESCRIPTIONS
1. CLOCK Suspend
2. DQM Operation
*Note :1. CKE to CLK disable/enable = 1CLK.
2. DQM masks data out Hi-Z after 2CLKs which should masked by CKE ”L”.
3. DQM masks both data-in and data-out.
C L K
C M D
D Q M
D Q ( C L 2 )
D Q ( C L 3 )
R D
Q0
Q2
Q3
Q1
Q2
Q3
D 0
D 1
D 3
D 1
D 3
D 0
W R
M a s k e d b y D Q M
M a s k e d b y D Q M
C L K
C M D
D Q M
D Q ( C L 2 )
D Q ( C L 3 )
C K E
R D
Q0
Q2
Q4
H i - Z
H i - Z
H i - Z
Q6
Q7
Q8
Q5
Q6
Q7
Q1
Q3
H i - Z
H i - Z
H i - Z
H i - Z
H i - Z
1 ) W r i t e M a s k ( B L = 4 )
2 ) R e a d M a s k ( B L = 4 )
D Q M t o D a t a - i n M a s k = 0
D Q M t o D a t a - o u t M a s k = 2
3 ) D Q M w i t h c l c o k s u s p e n d e d ( F u l l P a g e R e a d )
* N o t e 2
I n t e r n a l
C L K
Q9
Q8
C L K
CM D
CK E
I nt e r n al
CL K
DQ ( C L 2 )
DQ ( C L 3 )
R D
Q 2
Q 0
Q 1
Q 3
Q 0
Q 1
Q 3
D 0
D1
D2
D3
D1
D 2
D 3
D0
W R
M a s k e d b y C K E
1 ) C l o c k S u s p e n d e d D u r i n g W r i t e ( B L = 4 )
2 ) C l o c k S u s p e n d e d D u r i n g R e a d ( B L = 4 )
N o t W r i tt e n
Su s pe nd ed D ou t
Q 2