Cirrus Logic EP93xx User Manual
Page 205
DS785UM1
7-23
Copyright 2007 Cirrus Logic
Raster Engine With Analog/LCD Integrated Timing and Interface
EP93xx User’s Guide
7
7
7
Please note that as the frame number progresses, the bit pattern in each row moves to the
right one pixel. This type of pattern shown in an area may cause diagonal lines to appear as
though they are moving to the right. As previously stated, any image distortion greatly
depends on the application. However, the pattern shown in
will have less of a
tendency to demonstrate a walking distortion.
Figure 7-7. Creating Bit Patterns that Move to the Right
Assuming that the 3-bit input pattern that represents this 33% duty cycle grayscale is 0x2 (or
010b), the values in
are used to program this pattern into the grayscale look-up-
table. In this mode, the X locations are ignored by the grayscale generation.
Finally, just for demonstration purposes, a matrix with mixed 3 and 4 count axes is shown in
.
Frame 0
H O R Z
Frame 1
V
1
0
0
0
1
0
E
0
0
1
0
1
0
R
0
1
0
0
0
1
T
Frame 2
0
0
1
1
0
0
1
0
0
Table 7-8. Programming 33% Duty Cycle into the Lookup Table
Frame
Vert
Horz
VCNT (lines)
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
GrySclLUT
Address *4
Ctr
Ctr
Ctr
HCNT
(pixels)
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
Frame
Pixel
Value
D18
D17
D16
register
address
D
1
5
D
1
4
D
1
3
D
1
2
D
1
1
D
1
0
D
9
D
8
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
0
0
0
base + 0x08
X
X
X
X
X
0
1
0
X
1
0
0
X
0
0
1
00
010
base + 0x28
X
X
X
X
X
1
0
0
X
0
1
0
X
0
1
0
01
010
base + 0x48
X
X
X
X
X
0
0
1
X
0
0
1
X
1
0
0
10
010
base + 0x68
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
11
010