[ACM-024] Display a video signal on DSO Nano V2 using Altera Hi-speed Transceiver (ALTGX).

ACM-024 Demonstration.
Display a video signal on DSO Nano V2 using Altera Hi-speed Transceiver (ALTGX).

This is an A/D and D/A demonstration using an ACM-024, Altera Cyclone IV GX FPGA board, and a Liner Technology LTC2274 evaluation board.

The ACM-024 imports an analog VGA signal (100Msps) and sends data to a D/A converter in slow speed. The DACed analog signal is displayed on Seed Studio, DSO Nano V2. This demonstration is just an example for reference.

Same demonstration using XILINX Spartan-6 is here.

 


System Configuration

pic0035.250
Components
Cyclone IV GX FPGA Board ACM-024 HuMANDATA
SIF40 to SMA Conversion Boad ACC-009 HuMANDATA
A/D Converter LTC2274 Evaluation board Liner Technology
Pocket size Oscilloscope DSO Nano V2 Seed Studio
Download cable Terasic Blaster Terasic
Video pattern generator GV-241 PROMAX

 

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The Pattern generator (GV-241) outputs high frequency signals for DSO Nano. In order to monitor signals with DSO Nano, the FPGA slows the rate of data down in 1/100 of original and outputs to UTL-012, isolated 16-bit D/A conversion board, to convert digital data to analog data.

 


Waveform

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In above picture, bottom waveform is raw signal generated by pattern generator. (2us/Div)
Top is slow-downed waveform by FPGA. A down pulse is added manually for capture.

DC component of a signal is not replayed in DACed waveform because of a limitation comes from A/D converter’s input circuit (About 100kHz or below will be cut off). High-frequency component of signal is reduced its amplitude because of a limitation comes from D/A converter’s slew rate.

Captured A/D data in ACM-024. (using SignalTap)

SignalTap.250

Test video signals make a monochrome striped pattern on a monitor. Sparse and dense pattern matches with above waveform.

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Captured waveform (DSO NANO V2)

DSO Nano displays authentic-looking waveform on it.

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Original high-speed signal cannot be captured without the system.

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As you can see, video signal was captured by an affordable oscilloscope.
This demonstration is just only for a demonstration and has no practicality. But we are grad if this gives you some hints for using our products.

 


ALTGX Transceiver Setting

- Data Rate : 2Gbps
- Reference Clock : 125MHz (On-board)
MegaWizard-Plug729.250
 
- Word Aligner: K28.5 -> K27.5(-)
Changed to match LTC2273's FAM(Frame Alignment Monitor)
MegaWizard-Plug730.250
 
- Rate Match FIFO: Enable, Skip Pattern:K28.5 Control Pattern: K28.5
MegaWizard-Plug731.250
 

About LTC2274

LTC2274 is a 105Msps, 16bit A/D converter. The captured analog data is converted into 8B10B encode serial data, so it is easy to connect to FPGA high speed serial interface (ALTGX)

 


About DSO Nano V2

DSO Nano V2 is Seed Studio's affordable pocket-size oscilloscope. I choose this because of just only price. It is very accessible. The DSO Nano V2's spesification is below:
 
DSO_Nano_v2_Man690
( Captured user manual, at the date of 2011/02/15)
 

Design Files

Please be forewarned that we do not offer sample design files.
 

We hope you find this demonstration informative.
Plase let us know if you notice any mistakes.
 

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