Texas Instruments TVP5154EVM - Manual (Page 8)

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2.2 Common Board Interface
2.3 Video Input Description
2.4 Video Output Description
Board Level Description
Note: If the I 2 C address is changed on either the TVP5154 board or the encoder board while the
TVP5154EVM is powered up, that device will not recognize the new I 2 C address. The reset
button on the TVP5154EVM must be pressed and WinVCC must be reconfigured for the new
I
2 C address.
The TVP5154EVM uses a 4-row 120-pin connector to share common signals and the 5-V power supply
between the boards. This connection allows multiple backends to be connected to the TVP5154EVM. The
EVM package is shipped with an encoder module. This connector shares all digital video bits (Y[7:0]), all
video clocks (VS, HS, GLCO/FID, and DATACLK), 5 V, ground, I
2 C bus (SCL and SDA), and reset.
The TVP5154EVM decoder has an analog input channel that accepts two video inputs for each decoder
core. The decoder supports a maximum input voltage range of 0.75 V, therefore, an attenuation of
one-half is needed for most input signals with a peak-to-peak variation of 1.5 V. The parallel termination
before the input to the device is 75
Ω
. The two analog inputs can be connected as either two selectable
composite video inputs, or one S-video input.
The TVP5154EVM allows the user to have up to two composite inputs or one S-video input for each of the
four-channels. The EVM software sets up and controls this input selection. The S-video input uses two
connectors, one for the luma channel and one for the chroma channel.
The EVM has a resistor network on each of the inputs. These networks attenuate the signal and allow a
75-
Ω
resistor to ground to be placed after the anti-alias filter for termination.
Each input has an anti-alias filter that can be in-circuit or bypassed by jumpers (JP1–JP8). To select the
filter, the shunts need to be positioned to short positions 1-3 and 2-4. To bypass the filter, the shunts need
to be moved to short positions 1-2 and 3-4 as shown in
Figure 2 . The boards are shipped with the filter
bypassed.
Figure 2. Anti-Aliasing Filter Selection
The 8-bit digital video outputs of the TVP5154 are routed to the four 32-pin headers (H2–H5), the DM642,
and finally to the 120-pin edge connector along with all video clocks on the TVP5154 module. The
encoder module connects to the 120-pin connector, and is capable of receiving digital video with or
without embedded syncs. The analog outputs of the encoder module are composite, S-video, and
component. For the user’s convenience, all of these outputs come out of the encoder module
simultaneously.
TVP5154EVM User's Guide 8 SLEU069A – February 2006 – Revised July 2006
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