Kinetic Technologies RD1-4028 User manual

March 2020 –Revision 03a (Rev. B) Page 1 of 16 Company Confidential
RD1-4028
DVI to DisplayPort Converter
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
STDP4028-RD1

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STDP4028-RD1
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.....................................................................................................................................5
2.1.1. I2C Host Port.......................................................................................................................................5
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.................................................................................................................................................. 15
3.4. Stuffing Options....................................................................................................................................... 16
3.4.1. Single/dual bus TTL input ................................................................................................................ 16
3.4.2. IROM/SPI-Flash............................................................................................................................... 16

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List of Tables
Table 3.1-1. Principal Components and Functions............................................................................................ 9
Table 3.1-1. Principal Components and Functions (continue) ..........................................................................10
List of Figures
Figure 1. Connection Diagram: PC DVI Signal to DP 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™transmitter STDP4028
reference design board [RD1-4028_400-533] targeted for DVI to DP conversion applications.
2. Description
The STDP4028 is an integrated circuit featuring a four lane DisplayPort transmitter, quad LVDS /LVTTL
receiver with I2S, and SPDIF audio inputs 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 RD1-4028 is a low cost compact four layer board that includes necessary
interfaces and features to fully demonstrate the STDP4028 transmitter functionalities. The RD1-4028 board
includes discrete TMDS receiver chips, converting DVI signal into LVTTL input for STDP4028. This board is
capable of handling both single link and dual link DVI input signals supporting video resolution from 640 x 480
up to 2560 x 1600. The RD1-4028 also features digital audio inputs SPIDIF and I2S up to 8 Ch.
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 dependingon
external controllers.
2. Slave configuration: Includes provision to configure the device by an external controllerthrough
the Host Interface to I2C.

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2.1. Set Up Instructions
The picture below is a connection diagram showing the RD1-4028 board used for transferring a PC DVI signal
into a DisplayPort stream. This board uses the standard DisplayPort connector recommended in the DP 1.1a
specification to connect the DisplayPort output from the board to the input of the DisplayPort monitor.
1. Connect the DVI output from a PC source to the RD1-4028 reference board using a DVIcable.
2. Connect the output to a DisplayPort monitor using a DP cable. The RD1-4028 boardsupports
both single link and dual link DVI.
3. Connect the 12 V (4A) DC power brick supplied for powering the board. An external digitalaudio
(I2S or SPDIF) source is recommended for testing digital audio conversion by the STDP4028
device into DisplayPort output.
4. Once the connection is established, power ON the PC, monitor, RD1-4028 (DP transmitter)
board. An image should pop up on the screen within 5-6 seconds.
Note: The default configuration is dual bus TTL (dual link DVI) video input and SPDIF audio in. For single bus
TTL input (single link DVI), change the bootstrap setting Boot[5] to GND (populate R510 and remove
509). STDP4028 register setting changes are required in order to receive audio on I2S input. This can
be done through I2C host configuration or through firmware changes.
The RD1-4028 supports video resolution from 640 x 480 up to 2560 x 1600 and audio up to 8 Ch.
2.1.1. I2C Host Port
Host connector (CN901) allows configuration of the STDP4028 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. STDP4028 default device ID is 0xE6/0xE7, but can be changed through bootstrap
settings. Refer to the STDP4028 datasheet for further details.
Figure 1. Connection Diagram: PC DVI Signal to DP Stream

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2.1.2. In-System Programming (ISP)
RD1-4028 uses SPI Flash to store the firmware. In case of a new firmware upgrade, the following method should
be used.
• ISP through UART connector: Allows programming the SPI Flash through UART (RS232)
connector. Requires GProbe board (RS232 converter circuit) and GProbe software tool (contact
Kinetic).
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 (CN902) on the RD1-4028 boardusing 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 CN504 to GProbe board is 1 to 1.
4. Hit the Reset button on the board (RESET SW901). You will see the firmware version and date of
firmware in the GProbe window. This indicates the DP receiver IC is functional. If the message
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 STDP4028.
Note: Refer to the STDP4028 datasheet for pinout descriptions.

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3. Board Description
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
STDP4028
The STDP4028 is capable of receiving and converting LVTTL video and I2S (or
SPDIF) audio input into a DisplayPort output. This device offers LVTTL input interface
configurable to map a wide range of display controller products. The 60-bit LVTTL
input ports on STDP4028 can be mapped to transfer video data either in two pixels
per clock or single pixel per clock of a chosen color depth.
U601
DP Output
DisplayPort output connector
CN801
Flash
The board includes an SPI Flash of 2 MB to hold the firmware. The SPI Flash can be
programmed (ISP) through UART interface
U602
DVI In
DVI Input connector
CN401
Sil163
DVI Receivers: The 48-bit TTL video output from DVI receivers are connected to the
STDP4028. By default, DVI input is configured for a single link operation up to 165
MHz. In this case, both transmitters are operating at half the clock rate. A custom
configuration is required for handling higher speed signals, such as WQXGA resolution.
(Contact your local Kinetic FAE for support.)
U401 U402
Digital Audio
Input
The I2S (8 channel) or S/PDIF (single wire, 3.3 V) audio input signals from the
external audio Codec card are received by CN903.
CN903
Analog S/PDIF
Input
Standard S/PDIF input connector.
CN904
Host Interface
Host Interface (I2C): This board includes a provision to access the STDP4028 device
from an external host controller through the Host Interface (I2C port) connection.
CN901
GProbe
GProbe Interface (+3.3V logic): the board also includes a GProbe connector that
connects to the STDP4028 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.
CN902
Reset
Reset Button, when pressed, triggers a system master reset through the internal reset
circuitry. The reset button is used for system reset and debugging purposes and is not
required for production board design as the STDP4028 produces an internal reset
during power ON.
SW901
IR Input
An IR connector for interfacing the IR receiver.
CN601
AUX_I2C
A simplified connector for Host Interface debug
CN602
AUX_UART
UART Interface (for UART-over-Aux testing)
CN603
LED
Single LED for indicating the power on status.
D301
EDID
EDID Option: Currently not populated to allow pass through.
U604
Crystal
An external crystal of 27 MHz. The design makes use of internal oscillator circuitry.
X601
ESD Diodes
ESD protection diodes for DisplayPort signal (main lanes, AUX, and HPD line). The
board implements low cost ESD diodes.
ESD801
ESD802
ESD803
ESD804
SW902
Switches UART between Host Interface & GProbe Interface (see mark on PCB).
SW902

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Table 3.1-2. Principal Components and Functions (continue)
Label
Description
RefDes
DVI Config
The RD1-4028 board has a switch for DVI transmitter hardware configuration. The
switch SW401 controls DVI Receivers U401 and U402. The switch position is logic
HIGH, which is set for dual pixel input mode of operation with rising edge data
sampling. The switch definitions are described in section 4.3.
SW401
Bootstrap
Options
The bootstrap options can be configured for:
−IROM/SPI Flash
−Single/Dual TTL
Refer to the datasheet for more details.
R503
R504
R509
R510
3.2. Connector Descriptions
The RD1-4028 has the following connectors. The locations of these connectors are shown in the board picture
in Figure 3.
CN301 –+12V DC 4A Power Input Jack
CN902 –GProbe Interface (4x1 pin keyed header) connects to the UART port of the STDP4028. Use the 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