  We reexamine the recent instanton motivated studies of Alford, Rajagopal and
Wilczek, and Berges and Rajagopal in the framework of the standard SU(2)
Nambu-Jona-Lasinio model. The chiral phase diagram is calculated in the
temperature--density plane, and the pressure is evaluated as the function of
the density. Obtaining simple approximate relations describing the $T$-$\mu$
and $T$-$p_F$ phase transition lines we find that the results of the instanton
based model and that of the NJL model are identical. The diquark transition
line is also given.
