AK8815 Datasheet, PDF (25/37 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Encoder

ASAHI KASEI
[AK8815/16]
( 12 ) On-chip Color Bar
The AK8815/16 can output Color Bar signal.
Color Bar signal to be generated has 100 % amplitude and 100 % 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 Mode Register.
When BBG-bit is set, BBG-bit is prioritized ( Black Burst is output ).
100%White
Synctip Level
Blanking Level
The following values are code for ITU-R. BT601
WHITE YELLOW CYAN
Cb
128
Y
235
Cr
128
15/16
210
146
15/166
170
15/16
GREEN
54
145
34
MAGENT
A
202
106
222
RED
90
81
240
BLUE
240
41
110
BLACK
128
15/16
128
( 13 ) Black Burst Signal generation function
The AK8815/16 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 [ Mode Register ] is set to “1”, same operation is processed as in the case where fixed-15/16 Y
signal and fixed-128 Pb / Pr signal outputs are input.
Operation mode setting is done by Mode Register setting.
MS0331-E-00
25
2004 / 08