first, an Anonymous send me a broken BFL single for free. thank you!
i disassemble the box and start a JTAG probing on JTAG2.
the board act the same as this post:
https://bt.irlbtc.com/view/66244.msg870733#msg870733but by the component size (29X29mm, 780pin), Flash memory size (64Mbit), i nearly to be certain it's a altera atratix3 FPGA. 99% possibility is a EP3SL150F780.
so i scraped the VIA under the chip, probe the JTAG pins, and finally find they bread the TDO line by remove the R36 resister.
by soldering the 0R resister back, I can detect the FPGAs by the JTAG normally.
so now is the result:
Device IDCODE : 00010010000100000010000011011101
it's a EP3SL150.
you can check the ID cords here:
http://www.altera.com/literature/hb/stx3/stx3_siii51013.pdfpage 16.
ADD:
i also check the price of this chip.
on digikey, it's about 2000-3000USD,
http://www.digikey.cn/product-search/zh/integrated-circuits-ics/embedded-fpgas-field-programmable-gate-array/2556262?k=EP3SL150but this old chip is about 200-300USD in China market for a new one, and about 50-60 USD for a used one. i discussed with my supplier about the strange price, they said because nearly no one use this stuff, so the price is like a " markdown sale", so there are no large quantity of this chip in the market, maybe only a few hundreds (both new and used one).
all above is only personal viewpoint, I shall not accept any responsibility.