ABEL - tezke zacatky

[Marek Sembol]

Zdravim konferu,
zacinam si hrat s ABELem (Xilinx IS7.1i WebPack) a mam problem.
Jednoduchy kus kodu (na par cyklu je vystup v 0, na par v 1 - prosim
nerozebirat nesmyslnost teto fce):

MODULE XPokus2
	clock		pin;
	o			pin istype 'reg';
	st3..st0 node istype 'reg';

	ST = [st3..st0];					  

EQUATIONS
	[ST, o].clk = clock;
	ST := ST + 1;
	when (ST == 0) then o := 0;
	when (ST == 2) then o := 1;
END


Po prelozeni na mne vyplivne par warningu:
WARNING:Xst:1780 - Signal <st0_xcQ> is never used or assigned.
WARNING:Xst:1780 - Signal <st1_xcQ> is never used or assigned.
WARNING:Xst:1780 - Signal <st2_xcQ> is never used or assigned.
WARNING:Xst:1780 - Signal <st3_xcQ> is never used or assigned.

Kdyz ST neni "node", ale "pin" je to bez warningu.
A ted otazky:
-jsou ty warningy problem?
-jak je odstranit?

Predem diky,
Marek