documentclass{scrreprt}

usepackage{xstring}
usepackage[backref=page,plainpages=false,pdfpagelabels,colorlinks]{hyperref}
usepackage[footnote,acronym,hyperfirst,style=long,nomain]{glossaries}


% acronym style
newacronymstyle{ex-footnote}%
{%
  GlsUseAcrEntryDispStyle{footnote}%
}%
{%
   GlsUseAcrStyleDefs{hyperfirst, footnote}%
   renewcommand*{genacrfullformat}[2]{%
    firstacronymfont{glsentryshort{##1}}##2%
    expandafterfootnoteexpandafter{expandafterglsentrylongexpandafter{##1}}%
   }%
   renewcommand*{Genacrfullformat}[2]{%
    firstacronymfont{Glsentryshort{##1}}##2%
    expandafterfootnoteexpandafter{expandafterglsentrylongexpandafter{##1}}%
   }%
   renewcommand*{genplacrfullformat}[2]{%
    firstacronymfont{glsentryshortpl{##1}}##2%
    expandafterfootnoteexpandafter{expandafterglsentrylongplexpandafter{##1}}%
   }%
   renewcommand*{Genplacrfullformat}[2]{%
    firstacronymfont{Glsentryshortpl{##1}}##2%
    expandafterfootnoteexpandafter{expandafterglsentrylongplexpandafter{##1}}%
   }%
}
setacronymstyle{ex-footnote}

makeglossaries


% arconyms
newacronym{RAM}{RAM}{Random Access Memory}
newacronym{SRAM}{SRAM}{Static gls{RAM}}
newacronym{VHSIC}{VHSIC}{Very High Speed Integrated Circuit}
newacronym{VHDL}{VHDL}{gls{VHSIC} Hardware Description Language}
newacronym{PLD}{PLD}{Programmable Logic Device}
newacronym{SPLD}{SPLD}{Simple gls{PLD}}


begin{document}

gls{SRAM}\
foofootnote{bar}

printglossary[type=acronymtype, title=Abbreviations]

glsaddallunused
end{document}