9 hardware cursor, 9 hardware cursor -24, Figure 7-8. three and four count axis -24 – Cirrus Logic EP93xx User Manual
Page 206: Figure 7-8
7-24
DS785UM1
Copyright 2007 Cirrus Logic
Raster Engine With Analog/LCD Integrated Timing and Interface
EP93xx User’s Guide
7
7
7
Figure 7-8. Three and Four Count Axis
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.
7.4.9 Hardware Cursor
The raster engine provides support for a hardware cursor. The hardware cursor has a
separate bus mastering interface that allows it’s image to be stored anywhere in memory.
Software provides a location start, reset, size, X and Y position, and two cursor colors. The
hardware loads a line at a time from memory and multiplexes the video stream data based on
the cursor values. The X and Y locations are compared to the horizontal and vertical counters
and trigger the state machine to enable the cursor output overlay.
Frame 0
H O R Z
Frame 1
V
1
0
0
0
0
1
0
0
E
0
0
1
1
0
1
0
0
R
0
1
0
0
0
0
1
1
T
Frame 2
0
0
1
1
1
0
0
1
1
0
0
0
Table 7-9. 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
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
Value
0
0
0
base + 0x08
X
X
X
X
0
0
1
0
1
1
0
0
0
0
0
1
00
010
base + 0x28
X
X
X
X
1
1
0
0
0
0
1
0
0
0
1
0
01
010
base + 0x48
X
X
X
X
0
0
0
1
1
0
0
1
1
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