HD3SS214

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SLAS907 – DECEMBER 2015

9.2.4 DP++ Support

The HD3SS214 supports DP++ implementations.

Figure 6. DP++ Docking Station Support

9.2.4.1 Design Requirements

For this example, use the parameters shown in Table 3

Table 3. Design Parameters

PARAMETER

VALUE

3.3 V

Source

DP x1

Sink

DP x2

AUX_SEL Level

M

DP++ Support

Yes

9.2.4.2 Detailed Design Procedure

For applications involving DP++ support, following design procedures must be followed.

9.2.4.2.1

AUX and DDC Switching

The HD3SS214 supports DP++ implementations.

According to the DP++ standard, the DP AUX line is repurposed as the DDC line when HDMI signals are being

transmitted. Unfortunately, the AUX and DDC signals have very different electrical requirements. AUX is a

result, these signals are electrically incompatible if extra circuitry is not designed to accommodate the signals.

The source selection design block uses conditional pull-up resistors to support AUX and DDC signals on a

unified line.Figure 7 illustrates the circuit that was used to enable the signal.

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