Products > Test Equipment
Tektronix TDS744 CRT to LCD color converter FPGA module DIY
ltarjanyi75:
--- Quote from: Tantratron on December 25, 2023, 09:22:52 am ---Yes please, picture would help me to vizualize.
--- End quote ---
Here is a picture about the RAMDAC area.
And to share the progress of my project, a picture about my power board. This will generate the 12V and 3.3V to LCD and 3.3V to my FPGA board (which is still under design). For sure this was the easier part and so far only could test in the scope and with a separate Spartan 6 devboard.
ltarjanyi75:
My best solution so far: soldered the smd version of the socket I have, then after soldering I cut off the plastic base from the bottom of the socket. It was quite easy. Now the socket grabs the RAMDAC correctly.
TerrySt:
--- Quote from: ltarjanyi75 on December 25, 2023, 03:09:03 pm ---My best solution so far: soldered the smd version of the socket I have, then after soldering I cut off the plastic base from the bottom of the socket. It was quite easy. Now the socket grabs the RAMDAC correctly.
--- End quote ---
Great! I'll have to try that also.
Terry
ltarjanyi75:
First results with my board in the scope. I reused Vincent's great code and Xilinx's xapp486 7:1 Serializer example code.
I still have some issues with the result (some random pixel noise, strange color changes and some issues with graph colors), but at least I see something on the LCD.
Also the contact of the PLCC socket is still not the best. At first attempt my image on the screen had some red pixel noise (can be seen on one of the pictures) which somehow disappeared after I pushed the board a bit more to RAMDAC.
I also have a soldering issue with my flash memory chip on the board (short on one of the SPI pins), so I have to reload the code to FPGA after every restart. But since it does not impact the other part of the FPGA, I have not yet tried to resolder the chip. First I wanted to make sure that my design could work at all...
Attached a short video also...
Video: https://1drv.ms/v/s!Am44vwFO-Vr3grcEEeiL6_0ZZbcnnQ
TerrySt:
Nice work. Great board design. Very compact.
I also had issues with random colors sometimes with Vincent's VHDL code. I couldn't get my head around some of the stuff he was doing in it, so I re-wrote it. I think my version (posted up above) is simpler and seems 100% stable.
Terry
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