Sundance SMT339 v.1.3 - Manual (Page 18)

Version 1.2 Page 18 of 27 SMT339 User Manual V1.3
2.7 Video Encoder/Decoder
The encoder/decoder is based on the ‘Philips Semiconductors’
SAA7109AE/108AE .
This provides decoding of PAL, NTSC and SECAM signal standards. On-board
scaling circuitry allows the output image size to be specified by the DSP using the I
2 C
interface. Two inputs are available through on-board connectors. These can be
defined as 2x CVBS or 1 Y/C channel, again configured over the I
2 C interface.
Image data from the decoder flows through the FPGA, for potential pre-processing,
before being routed to the DSP video ports.
The video encoder section of the device allows data from the DSP (which can be
post processed by the FPGA) to be displayed in a number of different output formats.
These include PAL, NTSC and VGA with resolutions up to 1280x1024 at 60Hz.
Alternatively the encoder can output High Definition (HDTV) resolution images of
1920x1080 interlaced (or 1920 x 720 progressive) at 50Hz or 60Hz. The input format
to the encoder is selectable between YCrCb and RGB.
The encoder also has output look-up tables and a hardware cursor sprite which can
be implemented by the user via the I
2 C bus.