8.2.2 DisplayPort Application

The DS160PR412 can be used as a four channel DisplayPort (DP) redriver demux for data rates up to 20 Gbps.

To use the device in a non-PCIe application, the RX_DET pin must be pin-strapped to GND with 1 kΩ resistor

(L0).

The inverted DisplayPort HPD signal can be used to put the device into standby mode by using its PD pin. Note

in a DisplayPort link a sink can use HPD line to create an interrupt for its link partner source. If HPD signal is

used for power management an RC filter must be installed to filter out HPD interrupt signals.

The device is a linear redriver which is agnostic to DP link training. The DP link training negotiation between a

display source and sink stays effective through the device . The redriver becomes part of the electrical channel

along with passive traces, cables, and so forth, resulting into optimum source and sink parameters for best

electrical link.

Figure 8-4 shows a simplified schematic for DisplayPort demultiplexing application using DS160PR412. Auxiliary

and Hot plug detect (HPD) are demuxed outside of DS160PR412. If system use case requires implementing DP

Minimum

recommended

decoupling

EQ0

EQ1

Pin strap to fine tune

EQ gain settings

GND

GPIO mode

MODE

1 NŸ

RX_DET

GAIN

Optional pin strap

control for DC gain

1k

Linear

Driver

RXnP

RXnN

CTLE

Linear

Driver

DisplayPort

Source

DisplayPort

Sink A

DisplayPort

Sink B

DS160PR412

DP Main Link Redriver

1:2 Demux

TXAnP

TXAnN

TXBnP

TXBnN

TS3A5223

2-Ch 2:1 mux

AUXBp

AUXBn

HPDB

AUXAp

AUXAn

HPDA

AUXBp

AUXBn

HPDB

AUXAp

AUXAn

HPDA

AUXp

AUXn

HPD

AUXp

AUXn

HPD

3.3V

59k

0.1 F

HPD

For brevity AUX

biasing is not shown

PD

SEL

Demux control

VCC

0.1 F

(2x)

VCC

1 F

1 of 4

channels

VREG1

0.1 F

VREG2

0.1 F

GND

100k

Figure 8-4. Simplified Schematic for DisplayPort Demultiplexer Application

DS160PR412

SNLS685 – DECEMBER 2020

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