Kinetic Technologies RD2-4020 User manual

March 2020 –Revision 03a (Rev. B) Page 1 of 16 Company Confidential
RD2-4020
DisplayPort to Quad-LVDS Output
Kinetic Technologies cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in
a Kinetic Technologies product. No intellectual property or circuit patent licenses are implied. Kinetic
Technologies reserves the right to change the circuitry and specifications without notice at any time.
Reference Design Eval Kit
STDP4020-RD2

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STDP4020-RD2
March 2020 –Revision 03a (Rev. B) Page 2 of 16 Company Confidential
Contents
1. Purpose and scope............................................................................................................................................4
2. Description.........................................................................................................................................................4
2.1. Set Up Instructions.....................................................................................................................................4
2.1.1. I2C Host Port.......................................................................................................................................6
2.1.2. In-System Programming (ISP)............................................................................................................6
2.1.3. Diagnosis ............................................................................................................................................6
3. Board Description..............................................................................................................................................7
3.1. Principal Components and Functions ........................................................................................................9
3.2. Connector descriptions............................................................................................................................ 10
3.3. Switches.................................................................................................................................................. 16
3.4. Stuffing Options....................................................................................................................................... 16
3.4.1. Dual/quad TTL ................................................................................................................................. 16
3.4.2. IROM/SPI-Flash............................................................................................................................... 16

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List of Tables
Table 3.1-1. Principal Components and Functions............................................................................................9
List of Figures
Figure 1. Connection Diagram: PC DP Signal to LVDS Stream .......................................................................5
Figure 2. Block Diagram .................................................................................................................................... 7
Figure 3. Board Picture......................................................................................................................................8

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1. Purpose and scope
This document provides description and setup instructions for the DisplayPort™Receiver STDP4020
reference design board [RD2-4020_400-534] targeted for DisplayPort to LVDS conversion applications.
2. Description
The STDP4020 is an integrated circuit featuring a four lane DisplayPort receiver, quad LVDS & LVTTL
transmitter with I2S and SPDIF audio outputs for digital audio-video conversion application. This device also
includes SPI interface, I2C Slave (Host Interface), I2C Master Interface, UART (GProbe) interface, and
general-purpose IO pins. The RD2-4020 is a low cost compact four layer board that includes necessary
interfaces and features to fully demonstrate the STDP4020 receiver functionalities. This reference design
meets the following:
1. Stand-alone operation: Includes necessary firmware (either IROM or external SPI) to work
independently; this means the intended functionalities are performed without depending onexternal
(Host) controllers.
2. Slave configuration: Provision to configure the device by an external Host controller through theHost
Interface to I2C (most likely when no SPI Flash is used).
2.1. Set Up Instructions
The picture below is a connection diagram showing the RD2-4020 board used for transferring a PC
DisplayPort signal into a quad channel LVDS output. This board uses the standard DisplayPort connector
recommended in the DP specification to connect the DisplayPort output of a PC or equivalent source device
and a quad channel LVDS output connector to connect to a commercial LVDS display or external circuit board
that can receive quad LVDS signals.

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Figure 1. Connection Diagram: PC DP Signal to LVDS Stream
Note: The LVDS output is also configurable as dual channel or single channel, depending on theuse
cases.
1. Connect the DisplayPort output from a PC source to the RD2-4020 reference board using a DP cable
(not provided with board).
2. Connect the output to an LVDS panel using LVDS cable (typically provided quad/dual channel cable,
depending on order type). Quad channel contains two cables (51 pin and 41 pin connector type) and
dual/single channel has single cable (41 pin connector).
3. Connect the 12 V (4A) DC power brick (supplied with board) for powering the board.
4. Connect an SPDIF audio cable (not provided) to connect the audio out from the board to an external
speaker or audio processor board. You can also order an audio processor board at Kinetic for evaluating
SPDIF or I2S (2 Ch) audio from the RD2-4020 board. A DisplayPort PC source that supports DP-Audio is
required for evaluating digital audio output of the RD2-4020 board.
5. Once the connection is established, power ON the PC, LVDS display, and the RD2-4020 (DPreceiver)
board. An image should pop up on the screen and you should hear the audio within 5-6seconds.
Note: The default configuration is quad channel LVDS video output and SPDIF audio out. For dualchannel
LVDS output, change the bootstrap setting Boot[5] to GND (populate R609 and remove608).
STDP4020 register setting changes are required in order to transmit audio on I2S output. This can be
done through I2C host configuration or through firmware changes.
The RD2-4020 supports video resolution from 640 x 480 up to 2560 x 1600 and audio up to 8 Ch.

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2.1.1. I2C Host Port
Host connector (CN4010) allows configuration of the STDP4020 IC from an external host (microcontroller)
through conventional I2C interface. User can plug two wires into pin 5 and pin 6 of this connector to access
the I2C port of the chip. STDP4020 default device ID is 0xE6/0xE7, but can be changed through bootstrap
settings. Refer to the STDP4020 datasheet for further details.
2.1.2. In-System Programming (ISP)
RD2-4020 uses SPI Flash to store the firmware. In case of a new firmware upgrade, one of the following
methods can be used.
1. ISP through DisplayPort connector: Allows programming the SPI Flash through DisplayPortinput
connector. Requires DP ISP board and GProbe software tool (contact Kinetic).
2. ISP through UART connector: Allows programming the SPI Flash through UART (RS232)connector.
Requires GProbe board (RS232 converter circuit) and GProbe software tool (contactKinetic).
2.1.3. Diagnosis
If the image does not come up, follow the steps below for diagnosis.
Note: The diagnosis requires the Kinetic GProbe software and hardware tool. Contact Kinetic for the
GProbe software and board.
1. Install the GProbe diagnostic tool on a computer and set the baud rate to 115,200.
2. Connect GProbe board (not supplied) to the serial port (or USB port if using USB version) ofthe
computer.
3. Connect the other end of the GProbe board to connector (CN403 UART port) on the RD2-4020board
using 4-wire cable (part of the GProbe board).
Note: CHECK POLARITY while connecting the cable; Pin 1 is marked on the board. The 4-wirecable
connection from CN403 to GProbe board is 1 to 1.
4. Hit the Reset button on the RD2-4020 board (RESET SW402). You will see the firmware version and
date of firmware in the GProbe window. This indicates the DP receiver IC is functional. If themessage
does not appear, reprogram the Flash using the ISP method described in the GProbe userguide.
5. Using an oscilloscope, check the video input and output from the STDP4020.
Note: Refer to the STDP4020 datasheet for pin out descriptions.

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DP
QLVDS
GPIOs
EDID
STDP4020
IR
SPI flash
gProbe
Crystal
12V
supply
Switch
regulator
LDO
Audio Conn
3. Board Description
LVDSconn
LVDSconn
PanelPower
HostConn
DP Ext.Connector
AuxI2C
Figure 2. Block Diagram

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Figure 3. Board Picture

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3.1. Principal Components and Functions
Below is a summary of all necessary connectors, switches, and other components. Please refer to the latest
board schematics for further details.
Table 3.1-1. Principal Components and Functions
Label
Description
RefDes
Power Input
(+12V)
Input 12 V, down conversion to 5 V, 3.3 V, and 1.2 V. This board uses a switch
regulator for 5 V and an LDO [low- dropout] for 3.3 V and 1.2 V. Note the analog and
digital supplies (3.3A and 3.3D or 1.2A and 1.2D) are isolated using ferrite beads.
CN301
STDP4020
The STDP4020 is capable of receiving and converting DisplayPort signals into Quad
LVDS output up to 400 MHz pixel rate with flexible channel and lane swapping options.
The STDP4020 supports RGB and YCC video color formats with color depth of 12
(YCC 4:2:2 only), 10, and 8 bits.
U601C
DP Input
DisplayPort Receiver
CN501
Flash
The board includes an SPI Flash of 2 MB to hold the firmware. The SPI Flash can be
programmed (ISP) through DP AUX Channel or through UART interface.
U702
Dual/Quad
LVDS Output
The RD2-4020 features two LVDS output connectors for Quad or Dual LVDS outputs.
Connector1: 902 (51 pin), Connector2: 901 (41 pin)
CN901
CN902
LVDS Backlight
Control
LVDS Backlight control
CN903
VR
Brightness manual adjustment.
VR901
Digital Audio
Output
Digital Audio Output [S/PDIF, I2S]: This board supports both compressed and
uncompressed audio formats. The extracted audio signal is transferred on a digital
audio output bus. This device comprises four I2S audio output ports supporting up to
eight channel LPCM audio and a single wire SPDIF output for encoded audio.
CN402
S/PDIF out
Standard S/PDIF output
CN404
Host Interface
Host Interface (I2C): This board includes a provision to access the STDP4020 device
from an external host controller through the Host Interface (I2C port) connection.
CN401
GProbe
GProbe Interface (+3.3V logic): The board also includes a GProbe connector that
connects to the STDP4020 UART port for communication with external PC sources for
debug purposes. The Kinetic GProbe tool (software) and PC serial port interface board
together create a debug environment for device debug and firmware update. The
GProbe interface is also used for ISP purposes.
CN403
Reset
Reset Button, when pressed, triggers a system master reset through the internal reset
circuitry. The reset button is used for system reset and debug purposes and is not
required for production board design as the STDP4020 produces an internal reset during
power ON.
SW402
IR Input
An IR connector for interfacing the IR receiver
CN701
LED
Single LED for indicating the power on status.
D301
Crystal
An external crystal of 27 MHz. The design makes use of internal oscillator circuitry.
X701
ESD Diodes
ESD protection diodes for DisplayPort signal (main lanes, AUX and HPD line). The
board implements low cost ESD diodes.
ESD501
ESD503
ESD504
ESD505
EDID
EDID Option: Currently not populated, to allow pass through.
U701
SW401
Switches UART between Host Interface & GProbe Interface
SW401
Bootstrap Options
The bootstrap options can be configured for:
−Dual/Quad LVDS
−IROM/SPI Flash
Refer to section 4.4 for more details
R606
R607
R608
R609
Backlight Control
Select output signal voltage, +3.3V or +5V (see mark on PCB).
JP903

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3.2. Connector descriptions
The RD2-4020 has the following connectors.
CN301 –+12V DC 4A Power Input Jack
CN403 –GProbe Interface (4x1 pin keyed header) connects to the UART port of the STDP4020. Use Kinetic
GProbe board and interface cable for connecting the board to an external PC that has GProbe software running.
Pin 1
+5V
Pin 2
GPROBE_TX
Pin 3
GPROBE_RX
Pin 4
GND
CN401 –I2C Host Interface (header 17X2) connector for connecting external host (microcontroller). This is
used only when an external host controller accesses the DisplayPort receiver; not used for normal operation. In
normal operation, internal MCU controls the overall functioning of the DisplayPort receiver (refer to the
schematics for complete pin description for the Host Interface).
Pin 1
+5V
Pin 2
+5V
Pin 3
GND
Pin 4
GND
Pin 5
I2C_SCL
Pin 6
I2C_SDA
Pin 7
HOST_Tx
Pin 8
HOST_Rx
Pin 9
RESET from Host
Pin 10
NC
Pin 11
GND
Pin 12
GND
Pin 13
AUX_UART_TX
Pin 14
AUX_UART_RX
Pin 15
AUX_I2C_SCL
Pin 16
AUX_I2C_SDA
Pin 17
NC
Pin 18
NC
Pin 19
GND
Pin 20
GND
Pin 21
NC
Pin 22
NC
Pin 23
IRQ/LCD_CN
Pin 24
IR_IN
Pin 25
I2C_MST_SCL
Pin 26
I2C_MST_SDA
Pin 27
GND
Pin 28
GND
Pin 29
LCD_POWER
Pin 30
MST
Pin 31
TP401
Pin 32
ODC_EN
Pin 33
TP402
Pin 34
FPS_DET