ASAHI KASEI

[AK8817/18]

Rev.000E

27

2007 / 03

(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 ).

Blanking Level

100%White

Synctip Level

The following values are code for ITU-R. BT601

WHITE

YELLOW

CYAN

GREEN

MAGENTA

RED

BLUE

BLACK

Cb

128

44

156

72

184

100

212

128

Y

235

162

131

112

84

65

35

16

Cr

128

142

44

58

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.