\documentstyle[12pt,timing]{article}
\begin{document}

\begintiminglabeled{CLK}{10}
\low\timelabelmidrisearrow{4}{200 nSec}\rise\high\fall\low\rise\high\fall\low\rise\high\fall\low\rise\high
\fall\low
\endtiming

\begintiming{GOSYNC}{10}
\low\low\rise\high\high\high\fall\low\low\low\low
\endtiming

\end{document}
