KiCad Schematics

[imcjohn]

Hey,

Would it be possible to get the KiCad schematics/board uploaded here? Also, the schematic on the blog post says there are known errors, so it would be nice to have a list of those with the schematic files but I understand if that's too much time.

[desaster]

Sorry about the lack of Kicad project, but it was a homemade board and work in progress so I didn't upload it here. I left the project at sort of unfinished stage and didn't come up with a final design.

If you're looking to build a similar project, I recommend not sticking to my design too closely. The schematic for tvp7002 may be useful (although not too different from TI's application notes). For the rest of the components you'd probably want to reconsider the components used.

• The CPLD is ancient, use something else or hook up to an FPGA (to give you PLL and stuff)
• SRAM is limiting, if you can work with SDRAM that would open up a lot
• I had some problems with the power supply, but that might have been due to the home-made board. Check the power requirements of the chip and verify the regulator design
• ENC28J60 ethernet chip - today I might try with ESP32 instead
• LPC1769 microcontroller - today I might try with ESP32 instead (or go with STM32 w/ ethernet support) (or go with softcore on FPGA)
• enc28j60 pinout was mirrored
• Something else that I forget, it's been 7 years

[imcjohn]

That all makes sense to me! I actually was planning on using the ESP32, as it seems like the best chip for the job. Depending on how far I go with this, I may use one core on the ESP32 to continuously update the stored video frame, and the other one for the webserver (that way there won't be any lag on the /grab call). I may stick with the CPLD/mcu design (with just some random dirt cheap altera cpld), as it keeps the cost for the total board ridiculously low as compared to a full fledged FPGA that can hold a soft core, and my goal is to try and make a cheap BOM wireless vga capture design, basically a wireless KVM tool for connecting to servers and messing around in the bios etc. Really appreciate the quick reply, I'll put any updates in this thread! It may be a good while before I get a chance to work on this, but definitely a project I plan on attempting.

[VladislavSmolyanoy]

Any progress on the project? Really interested

[imcjohn]

School's been quite busy, likely gonna start work once the semester is over haha. Strongly considering an fpga/softcore (likely microblaze) combination for ease of integration, but my goal is to make something that is cheap so a cpld/lowend fpga + esp32 might be the way to go there.

On Wed, Nov 18, 2020 at 6:11 PM VladislavS notifications@github.com wrote:

Any progress on the project? Really interested

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[mjmeans]

I too would like to see an ethernet design for retro gaming over the web. Maybe STM32F4x7. Add a PC front panel header pass-through for power and reset buttons, and power light sensing, And a PS/2 keyboard and mouse pass through over IP too. Maybe even add a temperature sensor. And power it off the 5VSB line, so that as long as the PC is plugged in, even if sleeping, the thing remains powered. A sort of poor-man's iLO.