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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.)