Texas Instruments TUSB546-DCI in a DisplayPort Application Application notes
- Category
- DisplayPort cables
- Type
- Application notes
Texas Instruments TUSB546-DCI in a DisplayPort Application**
The Texas Instruments TUSB546-DCI is a linear redriver that supports both USB3.1 Gen1 and DisplayPort 1.4 over a Type-C interface. It can also be used as a standalone redriver for DisplayPort applications. The TUSB546-DCI is ideal for use in DisplayPort applications because it is a linear redriver, which means that the output signal amplitude is a linear function of the input signal amplitude. This makes it transparent to link training, which is the process by which the DisplayPort source and sink determine the optimal settings for the link.
Texas Instruments TUSB546-DCI in a DisplayPort Application**
The Texas Instruments TUSB546-DCI is a linear redriver that supports both USB3.1 Gen1 and DisplayPort 1.4 over a Type-C interface. It can also be used as a standalone redriver for DisplayPort applications. The TUSB546-DCI is ideal for use in DisplayPort applications because it is a linear redriver, which means that the output signal amplitude is a linear function of the input signal amplitude. This makes it transparent to link training, which is the process by which the DisplayPort source and sink determine the optimal settings for the link.
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TUSB546-DCI in a DisplayPort Application
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Application Report
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TUSB546-DCI in a DisplayPort Application
MikeCampbell
ABSTRACT
The TUSB546-DCI is a linear redriver that supports both USB3.1 Gen1 and DisplayPort 1.4 over a Type-C
interface. Even though the TUSB546-DCI is released for the Type-C market, the TUSB546-DCI can also
be used as a standalone redriver for DisplayPort applications. This application report describes how to use
the TUSB546-DCI in a DisplayPort application. The information in this document can also be applied to
the TUSB1046-DCI.
Contents
1 Introduction ................................................................................................................... 2
2 USB 3.1 Default ............................................................................................................. 2
3 Polarity Inversion............................................................................................................. 3
4 AUX Implementation ........................................................................................................ 4
5 HPD Implementation ........................................................................................................ 6
6 Example Software ........................................................................................................... 6
Appendix A Schematics .......................................................................................................... 8
List of Figures
1 PCB Trace Shortener Feature of a Linear Redriver .................................................................... 2
2 Method to Enable DisplayPort Mode When in GPIO Mode............................................................ 3
3 TX1 and RX1 Polarity Swap (FLIP = 0)................................................................................... 3
4 AUXP/N Connections When AUX Bypassed ............................................................................ 4
5 AUX Implementation in DisplayPort Sink Application................................................................... 5
6 AUX Implementation in DisplayPort Source Application................................................................ 6
7 TUSB546-DCI Schematic................................................................................................... 8
8 TUSB546-DCI Configuration Control...................................................................................... 9
9 DisplayPort Connectors..................................................................................................... 9
List of Tables
1 AUX Snoop Enable Control ................................................................................................ 4
2 HPD Connection Options................................................................................................... 6
Introduction
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TUSB546-DCI in a DisplayPort Application
1 Introduction
The TUSB546-DCI is a Type-C linear redriver mux intended for Type-C source applications. The
TUSB546-DCI multiplexes between four DP1.4 lanes and USB3.1 to a single Type-C receptacle. In a
DisplayPort only application only the TUSB546-DCI’s DisplayPort functionality is required. The USB3.1
functionality must be disabled and USB3.1 pins are left unconnected.
Before any video can be sent between source and sink, the DisplayPort source (DPTX) transmitter
settings, both voltage swing and pre-emphasis, must be optimized to provide for a robust communication
path to the sink (DPRX). These settings are determined during the link training phase. The DisplayPort
standard defines a minimum eye opening at the end of channel in which a compliant receiver must
operate. A redriver (limited or linear) is needed when the eye opening is no longer compliant. The purpose
of a redriver is to compensate for inter-symbol interference (ISI) caused by frequency-dependent channel
loss through a lossy medium like FR4 PCB trace. When the channel loss is properly compensated (or
equalized), the result is a compliant signal at the receiver. Without system knowledge of a limited redriver
presence, a limited redriver can have a negative impact on link training. But a linear redriver, like the
TUSB546-DCI, is transparent to link training.
A redriver is considered linear when the output signal amplitude is a linear function of the input signal
amplitude. A linear redriver can be thought of PCB trace shortener (electrical signal of long trace will look
like shorter trace). An example of shortening PCB trace is shown in Figure 1. The linear feature of the
TUSB546-DCI makes it ideal for DisplayPort applications. The DPTX’s voltage swing and pre-emphasis
levels presence at TUSB546-DCI receiver will be passed through to the DPRX.
Figure 1. PCB Trace Shortener Feature of a Linear Redriver
2 USB 3.1 Default
Because of USB Type-C requirements, the TUSB546-DCI will power-up in USB 3.1 mode. For a
DisplayPort application, the TUSB546-DCI must be taken out of USB 3.1 mode and into four Lane
DisplayPort mode. If the TUSB546-DCI is configured for I2C mode (I2C_EN pin != 0), then software must
program bits 1:0 of address 0x0A (General Registers) to a 2’b10. If the TUSB546-DCI is configured GPIO
mode (I2C_EN pin = 0), then the CTL0 pin must transition high and then back low. One method to create
the toggle on CTL0 pin is illustrated in Figure 2. The value chosen for C1 and R1 should result in a
discharge rate in which CTL0’s VIH level is held for at least 16 ms.
The TUSB546-DCI USB3.1 signals are not used in a DisplayPort application. The following pins can be
left unconnected: SSTXP/N, SSRXP/N, SSEQ1, EQ0 and EQ1. SSEQ0/A0 can be left unconnected if
TUSB546-DCI is configured for GPIO mode. If TUSB546-DCI is configured for I2C, then this pin selects
the TUSB546-DCI's 7-bit I2C slave address.
RX2P
RX2N
TX2P
TX2N
TX1N
TX1P
RX1N
RX1P
FLIP
DP0P
DP0N
DP1P
DP1N
DP2P
DP2N
DP3P
DP3N
TUSB546-DCI
100 nF
100 nF
100 nF
100 nF
100 nF
100 nF
100 nF
100 nF
100 nF
100 nF
100 nF
100 nF
DP_ML0P
100 nF
100 nF
100 nF
100 nF
SNK_DP0P
SNK_DP0N
SNK_DP1P
SNK_DP1N
SNK_DP2P
SNK_DP2N
SNK_DP3P
SNK_DP3N
POLARITY is
swapped
DP_ML0N
DP_ML1P
DP_ML1N
DP_ML2P
DP_ML2N
DP_ML3P
DP_ML3N
DisplayPort Sink
Copyright © 2016, Texas Instruments Incorporated
3.3V
C1 (1 F)
CTL0
CTL1
TUSB546-DCI
R1 (100 K)
I2C_EN
3.3V
10 K
1 K
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Polarity Inversion
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TUSB546-DCI in a DisplayPort Application
Figure 2. Method to Enable DisplayPort Mode When in GPIO Mode
3 Polarity Inversion
The USB Type-C receptacle has symmetrical placement of the differential pairs. The TUSB546-DCI pin-
out is targeted for easy routing to the Type-C receptacle. Because of this, the TUSB546-DCI’s pin-out will
produce an undesired polarity swap on RX1 and TX1 pins in DisplayPort applications. This polarity swap
must be handled on the PCB. Figure 3 shows the DisplayPort input to output routing along with the
polarity swap on TX1 and RX1. This figure assumes that FLIP orientation is set to zero.
Figure 3. TX1 and RX1 Polarity Swap (FLIP = 0)
AUX Implementation
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TUSB546-DCI in a DisplayPort Application
4 AUX Implementation
The TUSB546-DCI will snoop AUX transactions in order to enable and disable DisplayPort lanes to save
power. It does this by monitoring the AUX traffic passing over the AUXP/N pins. If the TUSB546-DCI is
configured for GPIO mode, AUX snoop feature is enabled when CAD_SNK pin is low and disabled when
CAD_SNK pin is high. If TUSB546-DCI is configured for I2C Mode, then AUX snoop feature control is
based on the state of bit 7 in register 13h. System AUX signals must be connected to TUSB546-DCI
AUXP/N pins anytime the AUX snoop feature is enabled.
If system designer desires to handle power saving through an alternative method, the snoop feature can
be disabled. If TUSB546-DCI snoop feature is disabled, then the DisplayPort AUXP/N signals can bypass
the TUSB546-DCI. When bypassing the TUSB546-DCI AUXP/N pins, the AUXN pin should be pulled up
to 3.3V through 100K resistor and the AUXP pin should be pulled down to GND through a 100K resistor
as depicted in Figure 4.
Table 1. AUX Snoop Enable Control
GPIO or I2C Mode AUX Snoop Enabled AUX Snoop Disabled
GPIO Mode (pin I2C_EN = 0) CAD_SNK (pin 29) = Low CAD_SNK (pin 29) = HIGH.
All four DisplayPort lanes are enabled.
I2C Mode (pin I2C_EN != 0) Clear bit 7 Reg13h Set bit 7 Reg13h
Figure 4. AUXP/N Connections When AUX Bypassed
4.1 Sink Application
The AUXP/N from DisplayPort receptacle should be routed directly to TUSB546-DCI and then to
DisplayPort sink through 100 nF AC capacitor. The TUSB546-DCI SBU1 and SBU2 pins should be left
unconnected. The Figure 5 illustrates the AUX implementation for a DisplayPort sink application when
AUX snoop is enabled.
AUXN
AUXP
DisplayPort Receptacle
AUXN
AUXP
SBU2
SBU1
TUSB546-DCI
100nF
100nF
DisplayPort Sink
3.3V +/- 10%
1 M
1 M
AUXN
AUXP
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AUX Implementation
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TUSB546-DCI in a DisplayPort Application
Figure 5. AUX Implementation in DisplayPort Sink Application
4.2 Source Application
The AUX implementation for a source is similar to the sink implementation. The AUXP/N signals are
routed to TUSB546-DCI AUXP/N signals through a 100nF AC coupling capacitor. The SBU1/2 pins should
be left unconnected. The AUXP should have a 100kΩ pull-down resistor and AUXN should have a 100K
ohm pull-up resistor. These 100KΩ resistors must be on the TUSB546-DCI side of the 100 nF capacitors.
The source application may have the added complexity of supporting dual mode DisplayPort (DP++).
When supporting DP++, the TUSB546-DCI configured in GPIO mode (I2C_EN = 0) the SNK_CAD pin
must be connected to the CONFIG1 pin on DisplayPort receptacle through a buffer like the
SN74AHC1G125. The buffer is required because the internal pulldown on CAD_SNK pin is too strong to
register a valid VIH when a Dual mode adapter is plugged into the DisplayPort receptacle. If using
TUSB546-DCI in I2C mode, then system software must disable AUX snooping whenever the CONFIG1
pin is high.
Figure 6 illustrates an example AUX implementation of DisplayPort source application when TUSB546-
DCI is configured for GPIO mode (I2C_EN = 0).
AUXN
AUXN
AUXP
DP_PWR (3.3V +/- 10%)
10 K ± 105 K
(100 K recommended)
10 K ± 105 K
(100 K recommended)
GPU
TUSB546-DCI
100nF
100nF
AUXP
2 K 2 K
3.3V +/- 10%
SDA
DDC_EN
SCL
DisplayPort Receptacle
AUXN
AUXP
CONFIG1
CAD
SNK_CAD
SBU1
SBU2
HPD
HPD
HPDIN
1 M
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HPD Implementation
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TUSB546-DCI in a DisplayPort Application
Figure 6. AUX Implementation in DisplayPort Source Application
5 HPD Implementation
The TUSB546-DCI uses the HPDIN to enable and disable DisplayPort functionality to save power. The
HPD signal should be routed to either pin 23 or pin 32 based on the TUSB546-DCI GPIO/I2C Mode.
Table 2. HPD Connection Options
GPIO or I2C Mode HPD
GPIO Mode (pin I2C_EN = 0) Pin 32
I2C Mode (pin I2C_EN != 0) Pin 23
6 Example Software
TUSB546-DCI in I2C mode must be configured for DisplayPort only. The Aardvark script below shows
how to configure TUSB546-DCI for DisplayPort only mode. This script uses an arbitrary equalization value
for each lane’s receiver. Each receiver has 16 possible equalization settings. The actual value used
should be based on the channel insertion loss for each DisplayPort lane. This scripts slave address is set
to 0x0F which corresponds to both DPEQ0/A1 and SSEQ0/A0 pins being at a ‘1’ level. This slave address
should be changed to match DPEQ0/A1 and SSEQ0/A0 pins value in your system.
<aardvark>
<configure i2c="1" spi="1" gpio="0" tpower="0" pullups="0"/>
<i2c_bitrate khz="400"/>
===DP only and EQ override set====
<i2c_write addr="0x0F" count="1" radix="16"> 0A 12 </i2c_write> />
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Example Software
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TUSB546-DCI in a DisplayPort Application
===DP Lanes 0 and 1 EQ setting. 16 possible settings.====
===Lane 0 EQ: 0 Setting =====
===Lane 1 EQ: 1 Setting =====
<i2c_write addr="0x0F" count="1" radix="16"> 10 10 </i2c_write> />
===DP Lanes 2 and 3 EQ Settings. 16 possible settings.====
===Lane 2 EQ: 0 Setting =====
===Lane 3 EQ: 1 Setting =====
<i2c_write addr="0x0F" count="1" radix="16"> 11 10 </i2c_write> />
</aardvark>
' '
& &
% %
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Receiver
TUSB546-DCI
TUSB546_3P3V
SilkScreen:
BRD_3P3V
SilkScreen:
Connecting to DP
Tranceiver
DESIGN NOTE2
DESIGN NOTE6
Populate with
100uF if DP source
does not have AC
capacitors at its
output
Note polarity
is swapped.
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TUSB546-DCI in a DisplayPort Application
Appendix A
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Schematics
Figure 7. TUSB546-DCI Schematic
DisplayPort Source Connection
DisplayPort Sink Connection
Default is Short pins 2-3
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SILKSCREEN
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Appendix A
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TUSB546-DCI in a DisplayPort Application
Figure 8. TUSB546-DCI Configuration Control
Figure 9. DisplayPort Connectors
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Texas Instruments TUSB546-DCI in a DisplayPort Application Application notes
- Category
- DisplayPort cables
- Type
- Application notes
Texas Instruments TUSB546-DCI in a DisplayPort Application**
The Texas Instruments TUSB546-DCI is a linear redriver that supports both USB3.1 Gen1 and DisplayPort 1.4 over a Type-C interface. It can also be used as a standalone redriver for DisplayPort applications. The TUSB546-DCI is ideal for use in DisplayPort applications because it is a linear redriver, which means that the output signal amplitude is a linear function of the input signal amplitude. This makes it transparent to link training, which is the process by which the DisplayPort source and sink determine the optimal settings for the link.
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