THS8083T Datasheet, PDF (23/61 Pages) Texas Instruments – Triple 8-Bit, 80 MSPS, 3.3-V Video and Graphics Digitizer With Digital PLL

2.9 Input Mode Detection
The THS8083 supports detection of the graphics input format in co-operation with an external microcontroller. Via
the microcontroller interface the period of incoming HS and VS signals can be measured (HS_COUNT, VS _COUNT
register values), as well as the frequency of the DTO clock (DTO_INC register value) and the PLL lock condition
(terminal LOCK).
2.10 Test Mode
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. When programmed to read back during the horizontal
blanking interval this can be a test for accurate positioning of the blanking level.
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