  We study the Bloch dynamics of a Bose-Einstein condensate of cold atoms by
using the formalism of the discrete nonlinear Schroedinger equation. Depending
on the static force magnitudes the system is shown to exhibit two qualitatively
different regimes of Bloch oscillations - exponential decay for the static
force magnitude less than some critical value (defined by the condensate
density) and quasiperiodic oscillations in the opposite case. The relation of
these regimes to the onset of chaos in the system is discussed.
