YGV619
OSD of HDTV digital image
RAM
CPU
74MHz
ROM
SDRAM
AVDP6
MPEG2
decoder
YCbCr 16bit
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
RAM
CPU
14MHz
HSYNC,VSYNC
ROM
SDRAM
AVDP6
YS (AT0)
analog
RGB
analog
switch
analog input
analog RGB
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.
13
LSI [ LSI COMPUTER SYSTEMS ]
