THS8200IPFP Datasheet, PDF (36/104 Pages) Texas Instruments – All-Format Oversampled Component Video/PC Graphics D/A System

THS8200-EP
SLES253 – DECEMBER 2009
dtg2_hs_in_dly
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HS (Input)
RESET
Counter
>
=
RESET
Pixel
> Counter
=
VS (Input)
dtg2_vs_in_dly
dtg2_hdly
RESET
Counter
>
<
RESET
Counter
>
=
RESET
Line
> Counter
dtg2_hlength
=
dtg2_vdly
or
dtg2_vdly2
RESET
Counter
>
<
dtg2_vlength
or
dtg2_vlength2
Figure 4-15. THS8200 DTG VS/HS Output Generation
HS_Out
VS_Out
Note that both independent sets of delay registers allow accommodation of different input timing
references in slave mode. When the device is configured in master mode, the delay registers can
compensate for different external (frame memory) synchronization requirements.
4.7.2.3 Output Synchronization: Composite Sync
The composite sync is generated from a programmed sequence of (line type, breakpoint) combinations,
either user-programmed (in generic mode) or preset (in preset mode). The line type determines the
waveform shape at the output of the DAC(s) with programmable amplitudes and timings.
On each line, at the horizontal reference point of the DTG, the DTG decides where to start/stop the
DTG-generated data and where to pass input video data. For example, during an active video line,
ancillary data can be embedded in the digital stream outside the active video portion of the line, that we
might want to convert to analog. Alternatively, during a nonactive video line, where normally the
predefined line type would be inserted, ancillary data might need to be passed during the active video
portion of the line.
The amplitudes of positive, negative sync excursions and of the negative serration, pre- and
post-equalization and broad pulses are independently programmable between G/Y and BPb, RPr
channels. Therefore sync insertion can be programmed on only the G/Y output or on all DAC outputs.
In order to limit the number of selection bits to select the line type, and because of the fact that we can
define a set of line types that is mutually exclusive for SDTV and HDTV video modes, there are two DTG
video modes: SDTV and HDTV. There is a third DTG mode (VESA) which does not use the line
type/breakpoint state machine and only generates Hsync/Vsync outputs.
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Detailed Functional Description
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