Doxygen and VHDL digraph, only one graph showing -

running doxygen on vhdl file , wish display 2 digraphs (for example 2 state machines).

the html output of doxygen ever show 1 graph, , indeed output directories show 1 graph.

examples (not working):

--! @dot --! digraph "sm1" { --! s1 -> s2; --! } --! digraph "sm2" { --! s2 -> s2; --! } --! @enddot 

another not working:

--! @dot --! digraph "sm1" { --! s1 -> s2; --! } --! @enddot  --! @dot --! digraph "sm2" { --! s2 -> s2; --! } --! @enddot 

when doing in "c" file output works expected (i 2 graphs).

can please elaborate why not working in vhdl?

thanks lachlan.