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Before that You had to program DS28E01 with secret code with the use of the same FPGA.
Can that be done several times?
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Yes. The code is rewritable
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How to check, that DS28E01 really got programmed?
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You may use the "enabler" code and expose the enable signal in order to test its level after security check.
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What is the form of the "Enable" signal?
A constant high level even after the SHA-1 IFF module will be turned off or a pulse?
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If the security check is successfull, it goes high and keeps the level forever
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