AK8817_06 Datasheet, PDF (27/44 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Encoder

ASAHI KASEI
[AK8817]
(15) On-chip Color Bar
The AK8817 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
Synctip Level
Blanking Level
WHITE
YELLOW
CYAN
Cb
128
44
156
Y
235
162
131
Cr
128
142
44
GREEN
72
112
58
The following values are code for ITU-R. BT601
MAGENTA
RED
BLUE
BLACK
184
100
212
128
84
65
35
16
198
212
114
128
(16) Black Burst Signal generation function
The AK8817 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.
MS0413-E-03
27
2006 / 05