RD1-4028
DVI to DisplayPort converter
Reference board user guide
Rev. B
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herein at any time without prior notice. MegaChips does not assume any responsibility or liability arising out
of application or use of any product or service described herein except as explicitly agreed upon.
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RD1-4028
Contents
1.
2.
Purpose and scope .................................................................................................................................... 4
Description.................................................................................................................................................. 4
2.1.
Set up instructions............................................................................................................................... 4
I2C host port ................................................................................................................................ 5
In-System Programming (ISP) ..................................................................................................... 5
Diagnosis ..................................................................................................................................... 6
2.1.1.
2.1.2.
2.1.3.
3.
Board description ....................................................................................................................................... 7
3.1.
3.2.
3.3.
3.4.
Principal components and functions ................................................................................................... 9
Connector descriptions ..................................................................................................................... 10
Switches ............................................................................................................................................ 14
Stuffing options ................................................................................................................................. 15
Single/dual bus TTL input .......................................................................................................... 15
IROM/SPI-Flash ......................................................................................................................... 15
3.4.1.
3.4.2.
4.
Revision history ........................................................................................................................................ 16
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RD1-4028
List of tables
Table 1.
Table 2.
Principal components and functions................................................................................................ 9
Document revision history ............................................................................................................. 16
List of figures
Figure 1.
Figure 2.
Figure 3.
Connection set up ........................................................................................................................ 5
Block diagram .............................................................................................................................. 7
Board picture................................................................................................................................ 8
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RD1-4028
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 depending on
external controllers.
2.
Slave configuration: Includes provision to configure the device by an external controller through
the Host Interface to I2C.
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.
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RD1-4028
Figure 1.
Connection diagram: PC DVI signal to DP stream
1.
2.
Connect the DVI output from a PC source to the RD1-4028 reference board using a DVI cable.
Connect the output to a DisplayPort monitor using a DP cable. The RD1-4028 board supports
both single link and dual link DVI.
3.
Connect the 12 V (4A) DC power brick supplied for powering the board. An external digital audio
(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.
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.
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PCB设计
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