km4132g271b Samsung Semiconductor, Inc., km4132g271b Datasheet - Page 27

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

KM4132G271B
(Continued)
*Note : 1. DQM byte masking.
Pixel and I/O masking : By Mask at Write Per Bit Mode, the selected bit planes 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
Assume 8bpp,
White = "0000,0000", Red="1010,0011", Green ="1110,0001", Yellow ="0000,1111", Blue ="1100,0011"
i) STEP
i) ILLUSTRATION
¨ ç SMRS(LCR) : Load color(for 8bpp, through x 32 DQ color0-3 are loaded into color registers)
¨ è SMRS(LMR ): Load mask. Mask[31-0] ="1111,1111,1101,1101, 0100,0010,0111,0110"
¨ é Row Active with DSF "H" : I/O Mask by Write Per Bit Mode Enable
¨ ê Block Write with DQ[31-0] = "0111,0111,1111,1111,0101,0101,1110,1110"
--> Byte 3 : No I/O Masking ; Byte 2 : I/O Masking ; Byte 1 : I/O and Pixel Masking ; Byte 0 : DQM Byte Maskin g
Load(color3, color2, color1, color0) = (Blue, Green, Yellow, Red)
Before
Block
(Pixel
Block
Color Register
Mask Register
Color Register
Write
Write
data)
After
Before Write
DQ
After Write
&
I/O(=DQ)
I/O(=DQ)
DQMi
DQMi
See PIXEL TO DQ MAPPING TABLE.
By Pixel Data issued through DQ pin, the selected pixels keep the original data.
Note 2
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
Yellow DQ
Yellow DQ
Yellow DQ
Yellow DQ
Yellow DQ
Yellow DQ
31
Yellow DQ
Yellow DQ
31
1 1 0 0 0 0 1 1
1 1 1 1 1 1 1 1
0 0 0 0 1 1 1 1
1 1 0 0 0 0 1 1
PIXEL MASK
Color3=Blue
DQM
DQM
Yellow
Yellow
Yellow
Blue
Blue
Blue
Blue
Blue
Blue
Blue
Blue
3
3
=0
=0
24
25
26
28
29
30
27
31
=H
=H
=H
=H
=H
=H
24
=L
=L
24
2-0
, DQ
= "1100,0011,1110,0001,0000,1111,1010,0011"
0-31
Yellow DQ
Yellow DQ
Yellow DQ
Yellow DQ
Yellow DQ
Yellow DQ
Yellow DQ
Yellow DQ
23
23
1 1 1 0 0 0 0 1
1 1 0 1 1 1 0 1
0 0 0 0 1 1 1 1
1 1 0 0 0 0 1 1
Color2=Green
control each pixel.
I/O MASK
DQM
DQM
Yellow
Green
Blue
Blue
Blue
Blue
Blue
Blue
Blue
Blue
Blue
- 27
2
2
=0
=0
16
17
18
19
20
21
22
23
=H
=H
=H
=H
=H
=H
=H
=H
16
16
2-0
PIXEL & I/O MASK
(000-111).
Green DQ
Green DQ
Green DQ
Color1=Yellow
Green DQ
Green DQ
Green DQ
15
0 0 0 0 1 1 1 1
0 1 0 0 0 0 1 0
1 1 1 0 0 0 0 1
1 0 1 0 0 0 1 1
15
Green DQ
Green DQ
DQM
DQM
Yellow
Green
Green
Green
Green
Green
Red
Red
Red
Red
Red
1
1
=0
=0
10
12
14
11
13
15
8
9
=H
=L
=H
=H
=H
=L
=L
=L
8
8
(Pixel Mask)
1 0 1 0 0 0 1 1
0 1 1 1 0 1 1 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
7
White DQ
White DQ
White DQ
White DQ
White DQ
White DQ
7
White DQ
White DQ
Color0=Red
BYTE MASK
DQM
DQM
Note 1
White
White
White
White
White
White
White
White
White
White
Red
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
Note 1
0
0