Lucent Technologies MN10285K User Manual
On-Screen Display
ROM
MN102H75K/F75K/85K/F85K LSI User Manual
Panasonic Semiconductor Development Company
173
Panasonic
7.9.2
Graphics ROM Organization in Different Color Modes
The graphics layer supports up to sixteen colors, in the 16-color mode, but also
supports 2-, 4-, and 8-color modes. The smaller the number of colors, the less
ROM area required per tile. The figures in this section illustrate the ROM organi-
ROM area required per tile. The figures in this section illustrate the ROM organi-
zation for each color mode.
The example in figure 7-10 demonstrates the graphics ROM setup for line 16 of
the code 00 data when the graphics layer is in 16-color mode. The four bits of
data for each pixel, in sheets 1, 2, 3, and 4, determine the color palette used for
data for each pixel, in sheets 1, 2, 3, and 4, determine the color palette used for
that pixel.
Figure 7-10 Graphics ROM Setup Example for a Single Line
Line 1 data
Line 2 data
Line 3 data
.
.
.
.
.
Line 15 data
Line 16 data
8 bytes
GROMEND
−
7
GROMEND
−
6
GROMEND
−
5
GROMEND
−
4
GROMEND
−
3
GROMEND
−
2
GROMEND
−
1
GROMEND
Sheet 1 bits 7 to 0
Sheet 1 bits 15 to 8
Sheet 2 bits 7 to 0
Sheet 2 bits 15 to 8
Sheet 3 bits 7 to 0
Sheet 3 bits 15 to 8
Sheet 4 bits 7 to 0
Sheet 4 bits 15 to 8
1 byte
Graphics tile
Sheet 4
Sheet 3
Sheet 2
1 dot = 4 bits
= 16 colors
Bit 15
Bit 0
16 bits
Line 16
Line 1
Line 2
Line 3
Line 2
Line 3
(16-color mode)
(16-color mode)
0000 0000
0000 0000
0000 0000
0000 0000
1010 1010
1100 1100
1111 0000
0000 0000
(Setup example)
Use graphics palette 0
Use graphics palette 1
Use graphics palette 2
Use graphics palette 3
Use graphics palette 4
Use graphics palette 5
Use graphics palette 6
Use graphics palette 7
Bit 0
Bit 15
Graphics tile
Line 1
Line 2
Line 3
Line 2
Line 3
Line 16
In this example, line 16 of the code 00
graphics tile is set in 16-color mode.
graphics tile is set in 16-color mode.
Sheet 1