ASAHI KASEI
[AK8817/18]
(15) On-chip Color Bar
The AK8817/18 can output Color Bar signal.
Color Bar signal to be generated has 100 % amplitude and 75 % Saturation levels.
Color Bar signal is output by setting register.
When to output Color Bar signal, there are 2 modes of operation – one is external Sync timing mode for normal
operation, and the other is internal self-operation mode.
In internal self-operating mode, required timing is internally generated automatically. Namely, it is no need to input
synchronization timing from outside of the chip.
Operation mode setting is done by Control 1 Register .
When BBG-bit is set, BBG-bit is prioritized ( Black Burst is output ).
100%White
Blanking Level
Synctip Level
The following values are code for ITU-R. BT601
WHITE
128
235
YELLOW
44
CYAN
156
131
44
GREEN
72
112
MAGENTA
184
RED
100
65
BLUE
212
35
BLACK
128
16
Cb
Y
Cr
162
142
84
198
128
58
212
114
128
(16) Black Burst Signal generation function
The AK8817/18 can output Black Burst signal ( Black level output ).
When to output Black Burst signal, there are 2 modes of operation – one is external Sync timing mode for normal
operation , and the other is internal self-operation mode.
In internal self-operation mode, required timing is internally generated automatically. Namely, it is no need to input
synchronization timing from outside of the chip.
When BBG-bit of [ Control 1 Register ] is set to “1”, same operation is processed as in the case where fixed-16 Y signal
and
fixed-128 Cb / Cr signal outputs are input.
Operation mode setting is done by Control 1 Register setting.
Rev.001E
32
2009 / 12
AKM [ ASAHI KASEI MICROSYSTEMS ]
