Vizio VP50HDTV10A, Service Manual

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CONFIDENTIAL – DO NOT COPY Page 7- 11
File No. SG-0219
Figure 8-10 Digital Datapath
Digital Input Port
The Digital Input Port is 24-bit input bus that can be connected to external DVI receivers,
video decoders, etc. and is able to accept either 8-bit CCIR656 data, 16-bit 4:2:2 YUV data or
24-bit RGB data.
For RGB input data, a selectable color space converter is used to transform RGB video input
data from a DVI Rx to internal 16-bit 4:2:2 YUV. This allows the input data to be processed by
the Horizontal Enhancment Module (HEM), ACC, and ACM in the image processing block.
Other RGB input data streams, such as computer inputs, remain in the RGB space and are
processed as such.
The 24-bit Digital Input Port provides control signals to simplify signal detection. CCIR656
data streams embedd all timing markers, for the 24-bit and 16-bit inputs the following signals
are provided:
 CLK1 – Input pixel clock for 24-bit, 16-bit or CCIR656 inputs
 HS/CSYNC – Horizontal sync or composite sync signal
 VS/SOG – Vertical sync input or SOG input
 DV/CLAMP – Data valid input indicator
NOTE: Unused pins of the Digital Input Port can be reprogrammed as GPIOs to increase the
total number of GPIOs available.
Inputs to the digital input port are TTL compatible with a maximum clock speed of 135MHz.
Sync and clock polarity is programmable.