文档介绍：Application Report
SPRA961A − May 2004
High-Resolution Video Using the DM642 DSP and
the THS8200 Triple DAC
. Fowler Device Applications
ABSTRACT
The DM642 DSP has three 20-bit video ports capable of high definition (HD) display. The
video ports can be programmed to follow HDTV standards, such as SMPTE274M and
SMPTE296M. These HDTV standards follow a 4:2:2 convention where luminance and
chrominance signals are separated onto two different 8- or 10-bit data paths. This convention
is monly called Y/C mode. Many new HD displays accept Y’ponent inputs
(analog luminance and chrominance). The DM642 outputs digital luma and chroma (Y’CbCr)
and must be converted to analog, which can be achieved using the THS8200 triple-video
digital-to-analog converter (DAC). This application note gives a brief discussion on the HDTV
standards and demonstrates the hardware requirements/implementation for interfacing the
DM642 video port to a THS8200. A future revision of this application note will give software
configurations, THS8200 drivers, and an example application proving the discussed system.
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 HDTV Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SMPTE296M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SMPTE274M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 DM642 Video Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 THS8200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .