ESMT
BASIC FEATURE AND FUNCTION DESCRIPTIONS
1. CLOCK Suspend
M12S64322A
1) Cl oc k Su spe nd ed Du r in g W rite ( BL=4)
2) Clock Suspended During Read (BL=4)
CLK
CMD
WR
RD
CKE
Internal
CLK
DQ( CL 2)
D0
D1
Mask ed by C K E
D2
D3
Q0
Q1
Q2
Q3
DQ( CL3)
D0
D1
D2
D3
Q0
Q1
Q2
Q3
Not W r itten
Su s pen ded Dou t
2. DQM Operation
1)W rite Mask (BL=4)
2) Read Mas k (B L=4)
CLK
CMD
WR
RD
DQM
Ma s k e d b y D Q M
Ma s k e d b y D Q M
Hi-Z
DQ(CL2)
D0
D1
D3
Q0
Q2
Q3
DQ(CL3)
D0
D1
D3
Hi-Z
Q1
Q2
Q3
DQ M t o D at a- i n M a sk = 0
DQ M t o D at a- ou t Ma sk = 2
*Note2
3)DQM with clcok su sp end ed (F ull Page Read )
CLK
CMD
RD
CKE
Inter nal
CLK
DQM
Hi- Z
Hi-Z
DQ(CL2)
Q0
Hi-Z
Q2
Hi-Z
Q4
Hi-Z
Q6
Q7
Q8
Hi-Z
DQ(CL3)
Q1
Q3
Q5
Q6
Q7
*Note : 1. CKE to CLK disable/enable = 1CLK.
2. DQM masks data out Hi-Z after 2CLKs which should masked by CKE 鈥滾鈥?
3. DQM masks both data-in and data-out.
Elite Semiconductor Memory Technology Inc.
Publication Date: May. 2007
Revision: 1.0
18/46