We report preliminary results on top quark decays and measurements
of the top mass recently obtained by the CDF collaboration, using a data
sample of about 100 pb^-1 collected at the Tevatron collider.  Upper limits
for non Standard Model top decays into W + q (non b quark), Z + q and gamma +
q are given.  Top mass measurements are obtained in three topologies for ttbar
production and decay into W b: lepton + _>4 jets, di-lepton and all hadronic
final states.  The most precise measurement is obtained in the lepton + _> 4
jets topology using 34 events which have at least one jet tagged by the SVX or
SLT b-tagging algorithms and a good constrained kinematics fit.  Mass analyses
in the three channels yield:

M = 175.6 +/- 5.7 (stat) +/- 7.1 (syst) GeV/c^2  letpon + jets (_> 1 b-tags)

M = 159^+24_ -22 (stat) +/- 17 (syst) GeV/c^2    di-lepton + jets

M = 187 +/- 8 (stat) +/- 12 (syst) GeV/c^2       multijet (_> 1 b-tags)