The User Electronic Signature (UES) is a
bitfield
A bit field is a data structure that maps to one or more adjacent bits which have been allocated for specific purposes, so that any single bit or group of bits within the structure can be set or inspected. A bit field is most commonly used to repr ...
with user-defined content in a
programmable logic device
A programmable logic device (PLD) is an electronic component used to build reconfigurable digital circuits. Unlike digital logic constructed using discrete logic gates with fixed functions, the function of a PLD is undefined at the time of m ...
(PLD).
It is usually used for the storage of the ID and/or version number of the PLD, suited for
serial identification. Examples for PLD's with a UES are the industry standards
GAL16V8 and
GAL22V10. The size of the UES is device-dependent.
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References
Bit data structures
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