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Application Report
SPRA961A − May 2004
1
High-Resolution Video Using the DM642 DSP and
the THS8200 Triple DAC
J.B. Fowler Device Application
s
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 more commonly called Y/C mode. Many new HD displays accept Y’P
b
P
r
component inputs
(analog luminance and chrominance). The DM642 outputs digital luma and chroma (Y’C
b
C
r
)
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 SMPTE296M 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 SMPTE274M 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 DM642 Video Port 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 THS8200 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Video System Hardware Design Guidelines 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Conclusions 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 References 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A THS8200 Daughtercard Schematics for DM642 EVM 12 . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B THS8200 Driver Example 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Figures
Figure 1. SMPTE296M Vertical and Horizontal Components 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2. SMPTE274M Interlaced Vertical and Horizontal Components 4. . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3. SMPTE274M Progressive Vertical and Horizontal Components 5. . . . . . . . . . . . . . . . . . . . . . . .
Figure 4. Digital Video Data Transfer 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5. Interconnect between DM642 Video Port and the THS8200 9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
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