Texas Instruments DP159RSB User manual

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DP159RSB Evaluation Module
Aardvark is a trademark of Total Phase, Inc.
All other trademarks are the property of their respective owners.
User's Guide
SLLU224B–August 2015–Revised March 2018
DP159RSB Evaluation Module
This document describes how to use and configure the DP159RSBEVM along with recommendations for
system hardware implementation. These recommendations are only guidelines and it is the designer’s
responsibility to consider all system characteristics and requirements. Engineers should refer to the
datasheet for technical details such as device operation, terminal description, and so forth.
Contents
1 Overview...................................................................................................................... 2
1.1 What is the DP159? ................................................................................................ 2
1.2 What is the DP159RSBEVM?..................................................................................... 2
1.3 What is Included in the DP159RSBEVM?....................................................................... 2
1.4 DP159RSBEVM Board............................................................................................. 3
2 Hardware Description ....................................................................................................... 3
2.1 Video Connectors for DP159 Ports............................................................................... 4
2.2 Enable/Reset........................................................................................................ 4
2.3 Power................................................................................................................. 4
2.4 Jumper Configuration .............................................................................................. 5
2.5 Component Population Configuration............................................................................ 6
2.6 Local I2C Access Through J5 ..................................................................................... 6
2.7 Local I2C Access Through USB Interface via TUSB3410 .................................................... 7
2.8 Rsadj Potentiometer .............................................................................................. 10
3 Quick Start Guide .......................................................................................................... 10
4 References.................................................................................................................. 10
5 EVM Bill of Materials....................................................................................................... 11
6 EVM Schematics .......................................................................................................... 13
7 EVM Layout................................................................................................................. 20
List of Figures
1 DP159RSBEVM Board...................................................................................................... 3
2 DP159RSBEVM Block Diagram ........................................................................................... 3
3 Register Status / Control Tab .............................................................................................. 7
4 Eye Scan Tab ................................................................................................................ 8
5 Sample Eyescan at HDMI2.0 Raw ........................................................................................ 9
6 Sample Eyescan at HDMI2.0 Interpreted................................................................................. 9
7 HDMI Input Connectors ................................................................................................... 13
8 DP159RSB.................................................................................................................. 14
9 HDMI TX Connector ....................................................................................................... 15
10 DP159RSBEVM Select Options.......................................................................................... 16
11 Reset ........................................................................................................................ 17
12 1.1- and 3.3-V Regulators ................................................................................................ 18
13 TUSB3410................................................................................................................... 19
14 Layer 1 (Top) ............................................................................................................... 20
15 Layer 2 (GND).............................................................................................................. 20
16 Layer 3 (Power) ............................................................................................................ 21

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17 Layer 4 (Power) ............................................................................................................ 21
18 Layer 5 (GND).............................................................................................................. 22
19 Layer 6 (Bottom)............................................................................................................ 22
List of Tables
1 Jumper Settings.............................................................................................................. 5
2 Aardvark I2C (J5) Pin-Out................................................................................................... 6
3 DP159 Target I2C Address ................................................................................................. 7
4 DP159RSBEVM Bill of Materials......................................................................................... 11
1 Overview
1.1 What is the DP159?
The DP159 is a Dual-Mode DisplayPort to Transition Minimized Differential Signal (TMDS) retimer
supporting Digital Video Interface (DVI) 1.0 and High Definition Multimedia Interface (HDMI) 1.4b and 2.0
output signals. The DP159 supports the Dual-Mode Standard version 1.1 type 1 and type 2 through the
DDC link. The DP159 supports data rates up to 6 Gbps per data lane to support UltraHD (4K x 2K / 60
Hz) 8 bits per color high resolution video and HDTV with 16-bit color depth at 1080p (1920 x 1080 / 60
Hz). The DP159 can automatically configure itself as a redriver at data rates < 1.0 Gbps or as a retimer
above this data rate.
1.2 What is the DP159RSBEVM?
The DP159RSBEVM is a PCB created to help customers evaluate the DP159 device for video
applications. This EVM can also be used as a hardware reference design for implementation of the DP159
in the RSB package. PCB design/layout files can be provided upon request to provide PCB design
illustrations of the routing/placement rules.
Please note that the EVM design supports both the standard DP159 application and a DP159-thru-HDMI
application, so it contains many components that would not be needed by a typical DP159 application. A
separate reference design specific to the DP159 is available for customers.
1.3 What is Included in the DP159RSBEVM?
The major components of the EVM are as follows:
• DP159RSB
• Standard DP sink connector (connects to source)
• Standard HDMI source connector (connects to sink)
• DC power regulators
• I2C programming interface for external I2C host connection
• USB interface (I2C utility available)

DP159
(40-Pin RSB)
DP Connector Top
HDMI Connector
IN0P/N
IN1P/N
IN2P/N
IN3P/N
TMDS_D2P/N
TMDS_D1P/N
TMDS_D0P/N
TMDS_CLKP/N
AUXP/N DDC_SCL/SDA
AARDVARK
Connector
SCL_CTL
SDA_CTL
5-V
DONGLE
5-V to 3.3-V
LDO
3.3-V to 1.1-V
LDO
USB2
Connector
TUSB3410
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1.4 DP159RSBEVM Board
Figure 1 illustrates the DP159RSBEVM board.
Figure 1. DP159RSBEVM Board
2 Hardware Description
Figure 2 shows the DP159RSBEVM block diagram.
100-Ωdifferential impedance for HDMI and DP differential pairs.
Figure 2. DP159RSBEVM Block Diagram

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2.1 Video Connectors for DP159 Ports
The EVM has a DP connection for the source and a HDMI connection for the sink. J2 is a standard DP
connector (Molex 47272-0001). P2 is a standard HDMI connector (Molex 4715-10001). There is a third
video connection on the board for a HDMI source (P1), this function is not installed on the
DP159RSBEVM.
2.2 Enable/Reset
There are three device enable/reset options to use with the EVM:
A. Supervisor circuitry option
This is the default configuration on the DP159RSBEVM. The enable (EN) signal is held low until the
power good (PG) from the 3.3-V voltage regulator reaches a stable high-voltage level then released
high.
B. RC timing option
C26 external capacitor and internal resistor are used to control the EN ramp time after the device is
powered on. C26 is a Do Not Install (DNI option) by default. C26 needs to be installed and R77 needs
to be uninstalled to enable this option.
C. External control option
A push button (SW1) is provided for manual control of the DP159’s EN/OE input.
2.3 Power
A DC power jack (J9) to accept a 5-V wall power adapter is provided on the EVM. The DC power jack
(CUI Inc. PJ-202AH) has an inner diameter of 2.1 mm and an outer diameter of 5.5 mm. The tip of the +5-
V power supply must be positive. A +5-V power supply of at least 1.5 A that meets the given requirements
can be used to power the DP159RSBEVM. Power is provided to the EVM from the 5-V wall power adapter
when SW2 is set to position 1.
CAUTION
Care should be taken to not plug in any power source higher than the
configured voltage (5 V).
Alternately, it is possible to power the EVM by connecting a USB Micro cable from J13 to a USB host and
setting SW2 to position 3.

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2.4 Jumper Configuration
Jumpers are provided to operate the device/EVM in different configurations. Table 1 lists the jumper
settings.
Table 1. Jumper Settings
Jumper Signal Name Description Default Config
J1 HPD_SRC JP 1-2 for DP159 thru HDMI NC
JP 2-3 NOT USED
NC for DP159
J3 I2_EN_PIN JP 1-2 for I2C ENABLE NC
JP 2-3 for PIN STRAP
NC – PIN STRAP (internal pulldown)
J4 SCL JP 1-2 for USB IF TO I2C JP 1-2: USB I2C Interface
JP 2-3 for EXT IF TO I2C
NC – N/A
J6 SDA JP 1-2 for USB IF TO I2C JP 1-2: USB I2C Interface
JP 2-3 for EXT IF TO I2C
NC – N/A
J7 HDMI_SEL_TEST_A1 JP 1-2 for: NC
• I2C Addr bit A1 = 1, when I2C_EN = H
• Test mode, when I2C_EN = L
JP 2-3 for:
• I2C Addr bit A1 = 0, when I2C_EN = H
• Normal mode, when I2C_EN = L
NC for weak internal pulldown (normal
mode)
J8 VSADJ JP 1-2 for 6.5 kΩJP 1-2: Default of 6.5 kΩ
JP 2-3 for adjustable resistance
NC – N/A
J10 SLEW_CTL JP 1-2 for fastest data rate NC
JP 2-3 for 20 ps slow
NC for 40 ps slow
J12 EQ_SEL_A0 JP 1-2 for: NC
• I2C Addr bit A0 = 1, when I2C_EN = H
• Fixed EQ at 14 dB, when I2C_EN = L
JP 2-3 for:
• I2C Addr bit A0 = 0, when I2C_EN = H
• Fixed EQ at 7.5 dB, when I2C_EN = L
NC for adaptive EQ
J15 PRE_SEL JP 1-2 NOT USED JP 2-3
JP 2-3 for –2.5 dB
NC for 0 dB

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2.5 Component Population Configuration
To allow the DP159RSBEVM to support both the default DP input as well as a HDMI test input, there are
many components that need to be removed, placed, or modified depending on the board configuration.
Here’s a summary of the default component configuration for the DP159RSBEVM. In addition, the unused
HDMI receptacle is depopulated.
Function Reference Designator DP159RSBEVM
Differential Pair - IN C11, C12, C13, C14, C15, C16, C24,
C25 populated with 0.1 µF
Differential Pair - HDMI IN R14, R15, R18, R19, R20, R21, R22,
R23 not populated
SDA / SCL - HDMI R16, R17, R24, R25, R134, R135 not populated
Differential Pair - DP IN R112, R109, R111, R108, R110, R107,
R106, R105 populated with 0 Ω
SDA / SCL / HPD - DP R33, R31, R32 (R126, R136, R140,
R141 - snoop) populated with 0 Ω
Pullup Differential Pair HDMI IN R1, R2, R3, R4, R6, R7, R8, R9 populated, but not
connected
2.5.1 HPD Snoop Option
To accommodate systems that do not properly resend DDC commands after HPD goes low, we have
implemented a HPD snoop mode on the DP159RSBEVM. This mode allows the HPD line to be routed
around the DP159, but remain connected to the DP159 on the sink side to allow the DP159 to snoop its
state. This snoop mode is disabled by default on the DP159RSBEVMs.
• Pop R131, no pop R129, R130, R139 for HPD on
• No pop R131, pop R129, R130, R139 for HPD snoop only
2.5.2 DDC Snoop Option – not Available for DP159RSB REV B
To accommodate systems that do not properly support clock stretching on the DDC lines, we have
implemented a snoop mode on the DP159RSBEVM. This mode allows the DDC lines to be routed around
the DP159RSB, but remain connected to the DP159RSB on the sink side to allow the DP159RSB to
snoop the DDC traffic. This snoop mode is disabled by default on the DP159RSB REV B1 EVMs.
• Pop R126, R136, R140, R141. No pop R31, R32 – DP159RSB, DDC snoop only
• Pop R31, R32. No pop R126, R136, R140, R141- DP159RSB, DDC on
2.6 Local I2C Access Through J5
Access to DP159’s local I2C signals is provided via the J5 input connector. Note that I2C signal levels
should be at 3.3 V when I2C interface is accessed through the connector.
A standalone external I2C host can be connected via J5 for debug and control purposes. An example of an
external I2C Host controller is the Total Phase Aardvark™ I2C/SPI Host Adapter (Total Phase Part#:
TP240141). Sample scripts for this I2C Host controller are provided by request.
Table 2. Aardvark I2C (J5) Pin-Out
J5 pin # Description J5 pin
#Description
1 SCL_CTL 2 GND
3 SDA_CTL 4 NC
5 NC 6 NC
7 NC 8 NC
9 NC 10 GND

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(1) The target I2C address for DP159 can be modified by the EVM jumper settings.
Table 3. DP159 Target I2C Address(1)
DP159 I2C Target Address
Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (W/R)
A6 A5 A4 A3 A2 A1 A0
1 0 1 1 1 1 0 0/1
2.7 Local I2C Access Through USB Interface via TUSB3410
Access to DP159’s local I2C signals is also provided through the TUSB3410 on the DP159RSBEVM using
a USB TI Utility called Eye Scan. To use the utility:
• Install the Eye Scan software from Texas Instruments
• J6 must be set to SDA – SDA_USB
• J4 must be set to SCL – SCL_USB
• Attach USB micro cable to J13 and to the host computer
NOTE: The USB connection should be made prior to installing any DP or HDMI cables.
• Start the Eye Scan software
Figure 3 shows the Register Status / Control tab.
Figure 3. Register Status / Control Tab
Confirm that the SN65DP149/159/TMDS171/181 Interface is present and selected at the top. If it is not,
check the USB connection and confirm that the driver is loaded in Device Manager. It may take a moment
for the USB driver to load, if the DP159RSB does not appear, hit the Refresh button. This tab can be used
to read and write the status and control registers of the device.

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Figure 4 shows the Eye Scan tab.
Figure 4. Eye Scan Tab
To run an Eye Scan, select the Eye Scan tab, select the relevant lanes, and press scan. Note that Eye
Scan cannot be performed when the device is in retimer mode, it does not function in redriver mode.

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Note that at HDMI 2.0 speeds there is a bug that causes invalid eyescan results. Results that look like
this:
Figure 5. Sample Eyescan at HDMI2.0 Raw
Should be interpreted as this:
Figure 6. Sample Eyescan at HDMI2.0 Interpreted

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2.8 Rsadj Potentiometer
The default Rsadj value on the DP159RSBEVM is 6.5 kΩ. The optimal value for an application may vary
from 4.7 kΩto 7 kΩ. To allow customers to test the effects of various Rsadj values, there is a
potentiometer on the EVM at R76. The Rsadj value can be varied by turning the knob and setting J8 to
[2,3].
3 Quick Start Guide
The following steps provide quick start instructions:
1. Connect USB cable from J13 to a USB host, set SW2 to 3. LED D2 should light up.
Option: Apply 5-V power to J9, set SW2 to 1. LED D2 should light up.
2. If using external I2C adapter instead of pin straps, please configure the DP159 at this step using J5 or
through the USB interface.
3. Plug in a DP source using a standard DP cable into J2 (Standard DP connector).
4. Plug in an HDMI video sink device into P2 (standard HDMI connector) using a standard HDMI cable.
5. Video output on HDMI sink should be observed.
4 References
1. DP159 Data Sheet
2. Aardvark Adapter User Manual
3. High-Definition Multimedia Interface Specification Version 1.4b.
4. High-Definition Multimedia Interface Specification Version 2.0.