THS8083A Datasheet, PDF (23/64 Pages) Texas Instruments – TRIPLE 8 BIT 80 MSPS 3.3V VIDEO AND GRAPHICS

2.9 Input Mode Detection
The THS8083A supports detection of the graphics input format in cooperation with an external microcontroller. Via
the microcontroller interface, the period of incoming HS and VS signals (HS_COUNT, VS _COUNT register values),
the frequency of the DTO clock (DTO_INC register value), and the PLL lock condition (terminal LOCK) can be
measured.
2.10 ADC Readback Over I²C Interface
The ADC output data on each of the three channels can be sampled at a programmable position on each line
(PIXTRAP register value) and latched into pixel readback registers (CH< n >_RDBK register values) that can be read
by the microcontroller at lower speed via the I²C interface. Programming to read back during the horizontal blanking
interval can be a test for accurate positioning of the blanking level.
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