HD3SS214_16 Datasheet, PDF (12/25 Pages) Texas Instruments – 8.1 Gbps DisplayPort 1.3 2:1/1:2 Differential Switch

HD3SS214
SLAS907A – DECEMBER 2015 – REVISED JULY 2016
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8.2.3 Detailed Design Procedure
8.2.3.1 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).
8.2.3.2 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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