A self-designed ZYNQ 7010 FPGA development board -- no DDR but it works!
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Here it is: https://github.com/ustcpetergu/SqueakyBoard
Currently in development and near finish.
Tested OK: JTAG, clocking wizard, LEDs & buttons, boot from QSPI flash, ILA, HDMI output(up to 720p), USB-as-PS2 keyboard
TBD: CH375b
Failed: USB to UART(D+ and D- inverted)
What I need is pure FPGA but I choose ZYNQ(scavenged from EBAZ4205) because it's extremely low price.
Currently WIP: design my own FT2232H downloader instead of the CJMCU one, so I can have JTAG & UART together in one wire.
And you may wonder why ZYNQ? A 7 series pure FPGA like Artix is much better, but I just can't get them at a cheap enough price. I think I may be able to afford one or two, but it'll be too risky(partly due to I don't have tools to reball BGA myself). While ZYNQ 7010, buying 5 or 10 is not a problem.
Hi. These chips are scavenged from EBAZ4205(https://github.com/xjtuecho/EBAZ4205). Actually, the sellers offering the 4205 also have re-balled ZYNQ 7010 chip on sale, so I just pick the latter.
The reason for this may be a little complex ... Existing ZYNQ boards often don't have enough IO on the programmable logic side. They have a bunch of peripherals but these are connected to the ARM core, which is useless for me. Another reason is that I really want to use a single cable to power the board and download programs(and USB serial altogether, if I could design my own FT2232 downloader) just like on the Digilent ones, but scavenged things certainly couldn't do this.
That's a neat idea. I am curious though, why create a new card rather than use the one from which you scavanged? (I'm just trying to learn from those of you ahead of me on this trail.)
Peter Gu
lionwang
helge
Shawn Hymel
zittware
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