K4G323222A Datasheet, PDF (18/49 Pages) Samsung semiconductor – 32Mbit SGRAM

K4G323222A
BASIC FEATURE AND FUNCTION DESCRIPTIONS
1. CLOCK Suspend
CMOS SGRAM
1) Clock Suspended During Write (BL=4)
2) Clock Suspended During Read (BL=4)
CLK
CMD
WR
CKE
Internal
CLK
Masked by CKE
RD
Masked by CKE
DQ(CL2)
DQ(CL3)
D0 D1
D0 D1
D2 D3
D2 D3
Not Written
Note : CKE to CLK disable/enable=1 clock
2. DQM Operation
1) Write Mask (BL=4)
CLK
CMD
DQMi
Note 1
DQ(CL2)
DQ(CL3)
WR
D0 D1
Masked by DQM
D3
D0 D1
D3
DQM to Data-in Mask = 0CLK
Q0 ^DQ01
Q0
Q2
Q3
Q1
Q2 Q3
Suspended Dout
2) Read Mask (BL=4)
RD
Masked by DQM
Hi-Z
Q0
Q2 Q3
Hi-Z _{Q1 Q2}
Q3
DQM to Data-out Mask = 2CLK
3) DQM with Clock Suspended (Full Page Read) ^{Note 2}
CLK
CMD
RD
CKE
DQM
DQ(CL2)
DQ(CL3)
Hi-Z
Q0
Q2
Hi-Z
Q1
Hi-Z
Q4
Hi-Z
Q3
Hi-Z
Q6 Q7 Q8
Hi-Z
Q5 Q6 Q7
*Note : 1. There are 4 DQMi(i=0~3).
Each DQMi masks 8 DQi′s.(1 Byte, 1 Pixel for 8 bpp)
2. DQM makes data out Hi-Z after 2 clocks which should masked by CKE " L".
Rev. 1.3 (Dec. 2000)
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