km4132g271b Samsung Semiconductor, Inc., km4132g271b Datasheet - Page 19

• Manufacturer Part Number: km4132g271b
• Description: 128k X 32bit X 2 Banks Synchronous Graphic Ram Lvttl
• Manufacturer: Samsung Semiconductor, Inc.

KM4132G271B
BASIC FEATURE AND FUNCTION DESCRIPTIONS
1. CLOCK Suspend
2. DQM Operation
*Note : 1. There are 4 DQMi(i=0~3).
Note : CKE to CLK disable/enable=1 clock
DQ(CL2)
DQ(CL2)
DQ(CL3)
DQ(CL2)
DQ(CL3)
DQ(CL3)
3) DQM with Clock Suspended (Full Page Read)
Internal
CMD
DQM
CMD
CMD
DQMi
Note 1
CKE
CLK
CKE
2. DQM makes data out Hi-Z after 2 clocks which should masked by CKE " L".
CLK
CLK
CLK
Each DQMi masks 8 DQi s.(1 Byte, 1 Pixel for 8 bpp)
1) Clock Suspended During Write (BL=4)
1) Write Mask (BL=4)
RD
WR
WR
D
D
D
D
0
0
0
0
D
D
DQM to Data-in Mask = 0CLK
D
D
1
1
1
1
Q
Not Written
0
Masked by CKE
Masked by DQM
D
D
D
D
2
2
3
3
Hi-Z
Hi-Z
D
D
Note 2
3
3
Q
Q
2
1
- 19
2) Clock Suspended During Read (BL=4)
Hi-Z
Hi-Z
2) Read Mask (BL=4)
RD
RD
Q
Q
4
3
Hi-Z
Hi-Z
Q
Q
0
0
Hi-Z
Hi-Z
D
Q
Q
0
Q
Q
1
0
Masked by DQM
6
5
DQM to Data-out Mask = 2CLK
Q
Q
Suspended Dout
Q
Q
Masked by CKE
2
1
Q
Q
7
6
2
1
Q
Q
Rev. 2.4 (May 1998)
CMOS SGRAM
Q
Q
3
2
8
7
Q
Q
Q
3
2
3
Q
3