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Forum: FPGA, VHDL & Verilog watermarking on FPGA


Author: Hamid Kavian (Guest)
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I'm going to do a very simple watermarking. I want to embed a signature 
on unused LUTs. could you please tell me how I can do it?
Thank you very much.

Author: Lothar Miller (lkmiller) (Moderator)
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Hamid Kavian wrote:
> I want to embed a signature on unused LUTs.
What kind of "signature"?

> I want to embed a signature
In which way?

> I want to embed a signature on unused LUTs.
You cannot "embed" such a signature on LUTs, because without power every 
SRAM based FPGA (=99% on the market) forget whats in the LUT. And so all 
the LUTs have to be reloaded from some config flash during powerup...

Author: don haraldo (Guest)
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maybe it is possible to burn some of the luts individually by applying 
an overdose of power by toggling them very rapidly?

Problem: how to read them back?

Author: lkmiller (Guest)
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You have no kind of access to the LUTs from outside. If you select a LUT 
via JTAG then you simply will destroy some surrounding IO drivers by 
applying high voltage to those pins.

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