The User Electronic Signature (UES) is a

bitfield A bit field is a data structure that consists of 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 ...

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, a PLD has an undefined function at the time of manuf ...

(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 GAL22V10 is a series of programmable-logic devices from Lattice Semiconductor, implemented as CMOS-based generic array logic ICs, and available in dual inline packages or plastic leaded chip carriers. It is an example of a standard product ...

. The size of the UES is device-dependent.

References

Bit data structures {{electronics-stub