Signal output cannot be synthesized, bad synchronous description.

Hi bretelus ,

Thank you for the sugesstion.It works if I used plsrep='1'.

But when I try to output the clock pulse(clk_plstr here) then I again get the same error as:

"Signal output cannot be synthesized, bad synchronous description. The description style you are using to describe a synchronous element (register, memory, etc.) is not supported in the current software release."

The code to output this clock pluse looks like following:

process(clk_plstr)

begin

..........

if(clk_plstr'event and clk_plstr = '1')then ----xst error to output like this?

if(count_reg<=pls )then

output<='1';

else

output<='0';

end if;

end process;

It would be very helpful if you could point out the problem that I am getting now.Thank you