YGV619

13

OSD of HDTV digital image

OSD of HDTV digital image

OSD of HDTV digital image

OSD of HDTV digital image

AVDP6

CPU

RAM

ROM

MPEG2

decoder

YCbCr 16bit

SDRAM

74MHz

YCbCr 16bit

This is an example of the system configuration that uses AVDP6 as OSD image display device in HDTV.

Since the device is able to input / output YCbCr422 data at the frequency up to 80 MHz, it is possible to

control OSD for video signal of HDTV (1125i). In this case, The frequency of dot clock of OSD image

becomes up to 40 MHz (the resolution equivalent to color difference data).

(As the 74 MHz dot clock, it is necessary to input clock that synchronizes with external video signal.)

OSD of NTSC analog image

OSD of NTSC analog image

OSD of NTSC analog image

OSD of NTSC analog image

AVDP6

CPU

RAM

ROM

HSYNC,VSYNC

SDRAM

14MHz

analog

RGB

analog

switch

YS (AT0)

analog RGB

analog input

analog

RGB

When the external video is analog signal, switching signal for analog switch can be outputted together with

OSD display data. Since the dot clock that synchronizes with sync signal of external video can be regenerated

by using the built-in PLL, the superimposing function can be realized easily also for analog image signal.