HD3SS214

SLAS907 – DECEMBER 2015

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9.2.3 Detailed Design Procedure

9.2.3.1 DP Inputs

The HD3SS214 is used as a 1:2 DP switch, the DCx[p/n] are connected to the GPU; the outputs (DAx[p/n] and

DBx[p/n] ) are routed to the ++DP connectors of the platform.

NOTE

This application information is only to show the principles of operation of the HD3SS214

and not the requirements of all the implementation. Many implementations will require

external circuitry to compensate for signal loss (like a DP re-driver).

9.2.3.2 Source Selection Interface

Two control pins on the HD3SS214 are responsible for selecting the incoming DP signal: Dx_SEL and

AUX_SEL. Dx_SEL controls which high speed ports are selected. A low signal on Dx_SEL corresponds to Port A

routed to Port C and a high signal corresponds to Port B routed to Port C. A slide switch is used to select the

level for this signal. In an embedded application, this switch can be replaced by a GPIO signal from a

microcontroller.

AUX channel is controlled by AUX_SEL. This pin configures the switch to route the incoming AUX signal to the

outgoing AUX path, when AUX_SEL = 0 the AUXA channel will be routed to AUXC, when AUX_SEL = 1 the

AUXB channel will be routed to AUXC. Figure 5 shows the selection circuitry.

Figure 5. AUX_SEL Schematic

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