km4132g271b Samsung Semiconductor, Inc., km4132g271b Datasheet - Page 26

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

KM4132G271B
14. Mask Functions
*Note : 1. DQM byte masking.
1) Normal Write
2) Block Write
I/O masking : By Mask at Write Per Bit Mode, the selected bit planes keep the original data.
Pixel masking : By Pixel Data issued through DQ pin, the selected pixels keep the original data.
2. At normal write, ONE column is selected among columns decorded by A
At block write, instead of ignored address A
If bit plane 0, 3, 7, 9, 15, 22, 24, and 31 keep the original value.
If Pixel 0, 4, 9, 13, 18, 22, 27 and 31 keep the original white color.
i) STEP
i) ILLUSTRATION
i) STEP
i) ILLUSTRATION
Assume 8bpp,
White = "0000,0000", Red="1010,0011", Green = "1110,0001", Yellow = "0000,1111", Blue = "1100,0011"
¨ ç SMRS(LMR) :Load mask[31-0]="0111, 1110, 1011, 1111, 0111, 1101, 0111, 0110"
¨ è Row Active with DSF "H" :Write Per Bit Mode Enable
¨ é Perform Normal Write.
¨ ç SMRS(LCR) :Load color(for 8bpp, through x32 DQ color0-3 are loaded into color registers)
¨ è Row Active with DSF "L" : I/O Mask by Write Per Bit Mode Disable
¨ é Block write with DQ[31-0] = "0111, 0111, 1011, 1011, 1101, 1101, 1110, 1110"
Load(color3, color2, color1, color0) = (Blue, Green, Yellow, Red)
External Data-in
Before
Block
(Pixel
Block
Mask Register
Color Register
Write
Write
data)
After
Before Write
DQ
After Write
&
I/O(=DQ)
I/O(=DQ)
See PIXEL TO DQ MAPPING TABLE.
DQMi
DQMi
Note 2
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
31
31
White DQ
White DQ
White DQ
White DQ
White DQ
White DQ
1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 0
White DQ
White DQ
Color3=Blue
DQM
DQM
White
White
Blue
Blue
Blue
Blue
Blue
Blue
3
3
=0
=0
24
25
26
28
29
30
27
31
= "1100,0011, 1110, 0001, 0000, 1111, 1010, 0011"
=H
=H
=H
=H
=H
=H
=L
=L
24
24
2-0
, DQ
0-31
23
23
1 1 1 1 1 1 1 1
1 0 1 1 1 1 1 1
0 0 0 0 0 0 0 0
1 0 1 1 1 1 1 1
Color2=Green
White DQ
White DQ
White DQ
White DQ
White DQ
White DQ
White DQ
White DQ
control each pixel.
DQM
DQM
Green
Green
Green
Green
Green
Green
White
White
- 26
2
2
=0
=0
16
17
19
20
21
23
18
22
=H
=H
=H
=H
=H
=H
=L
=L
16
16
2-0
(000-111).
Color1=Yellow
White DQ
White DQ
White DQ
White DQ
White DQ
15
0 0 0 0 0 0 0 0
0 1 1 1 1 1 0 1
1 1 1 1 1 1 1 1
1 0 0 0 0 0 1 0
15
White DQ
White DQ
White DQ
DQM
DQM
Yellow
Yellow
Yellow
Yellow
Yellow
Yellow
White
White
1
1
=0
=0
10
11
12
14
15
13
8
9
=H
=L
=H
=H
=H
=H
=H
=L
8
8
0 0 0 0 0 0 0 0
0 1 1 1 0 1 1 0
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
7
White DQ
White DQ
White DQ
White DQ
White DQ
White DQ
7
White DQ
White DQ
Color0=Red
DQM
DQM
Note 1
White
White
White
White
White
White
White
White
0
0
Rev. 2.4 (May 1998)
=1
CMOS SGRAM
=1
1
2
3
5
6
7
0
4
=H
=H
=H
=H
=H
=H
=L
=L
0
0