is42g32256 ETC-unknow, is42g32256 Datasheet - Page 23

• Manufacturer Part Number: is42g32256
• Description: 256k 16-mbit Synchronous Graphics
• Manufacturer: ETC-unknow

IS42G32256
Table 13. Mask Function Procedure (continued)
Integrated Silicon Solution, Inc.
ADVANCE INFORMATION SR037-0C
09/10/98
b. Illustration
Note:
1. At normal write, ONE column is selected among columns decoded by A2-0 (000-111).
3. Pixel and I/O masking: By Mask at Write Per Bit Mode, the selected bit planes keep the original data.
Assume 8bpp,
White = “0000, 0000”, Red = “1010, 0011”, Green = “1110, 0001”, Yellow = “0000, 1111”, Blue = ‘ 1100, 0011"
a. STEP
At block write, instead of ignored address A2-0, DQ0-31 control each pixel.
Before Block Write & DQ (Pixel data)
I.
II. SMRS(LMR) Load mask. Mask[31-0] = “1111, 1111, 1101, 1101, 0100, 0010, 0111, 0110”
III. Row Active with DSF “H” : I/O mask by Write Per Bit Mode Enable
IV. Block Write with DQ [31-0] = “0111, 0111,1111, 1111, 0101, 0101, 1110, 1110” (Pixel Mask)
After Block Write
Color Register
I/O (=DQ)
SMRS(LCR): Load color (for 8bpp, through x 32 DQ color0-3 are loaded into color registers)
Load (color3, color2, color1, color0, ) = (Blue, Green, Yellow, Red)
=“1100, 0011, 1110, 0001, 0000, 1111, 1010, 0011"
Byte 3 : No I/O Masking ; Byte 2: I/O Masking ; Byte 1: I/O and Pixel Masking ; Byte 0: DQM Byte Masking
DQMi
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
(1)
By Pixel Data issued through DQ pin, the selected pixels keep the original data.
See Pixel To DQ Mapping Table.
White DQ24=H
White DQ25=H
White DQ26=H
White DQ28=H
White DQ29=H
White DQ30=H
White DQ27=L
White DQ31=L
31
Color3=Blue
DQM3=0
White
White
Blue
Blue
Blue
Blue
Blue
Blue
24
White DQ16=H
White DQ17=H
White DQ19=H
White DQ20=H
White DQ21=H
White DQ23=H
White DQ18=L
White DQ22=L
Color2=Green
23
DQM2=0
Green
Green
Green
Green
Green
Green
White
White
16
White DQ10=H
White DQ11=H
White DQ12=H
White DQ14=H
White DQ15=H
White DQ13=L
Color1=Yellow
White DQ8=H
White DQ9=L
15
DQM1=0
Yellow
Yellow
Yellow
Yellow
Yellow
Yellow
White
White
8
White DQ1=H
White DQ2=H
White DQ3=H
White DQ5=H
White DQ6=H
White DQ7=H
White DQ0=L
White DQ4=L
Color0=Red
7
DQM0= 1
White
White
White
White
White
White
White
White
0
ISSI
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