  $\Dz-\Dzb$ mixing and significant CP violation in the charm system may
indicate the signature of new physics. In this study, we suggest that the
coherent $\DzDzb$ events from the decay of $\Upsilon(1S) \to \Dz \Dzb$ can be
used to measure both mixing parameters and CP violation in charm decays. The
neutral $D$ mesons from $\Upsilon(1S)$ decay are strongly boosted, so that it
will offer the possibility to measure the proper-time interval, $\Delta t$,
between the fully-reconstructed $\Dz$ and $\Dzb$. Both coherent and
time-dependent information can be used to extract $\Dz-\Dzb$ mixing parameters.
The sensitivity of the measurement should be improved at B factories or
super-B.
