Help with modelling with MODELSIM

It is because you have added few nodes first then you started running simulation then stopped it then added more nodes then you continued running simulation.

All you have to do is add all nodes from start then run your simulation.

--- Quote Start ---

-- Implement Toggle FFs

ASYNCH_CNT: for i in 0 to ORDER-1 generate

-- what does generate do? i read about loop but don't know what generate means here?

T_FF:process(clks) is

begin

if rising_edge(clks(i)) then

qs(i) <= not qs(i); -- Implements a T_ Flip Flop

end if;

end process T_FF;

end generate;

--- Quote End ---

Does it mean that I can write this as the following:

--- Quote Start ---

-- Implement Toggle FFs

--ASYNCH_CNT: for i in 0 to ORDER-1 generate

T_FF1:process(clks) is

begin

if rising_edge(clks(0)) then

qs(0) <= not qs(0); -- Implements a T_ Flip Flop

end if;

end process T_FF1;

:

:

:

:

:

T_FF20:process(clks) is

begin

if rising_edge(clks(20)) then

qs(20) <= not qs(20); -- Implements a T_ Flip Flop

end if;

end process T_FF20;

--end generate;

--- Quote End ---

no because you need to use edge of each clk separately (clks is multiple clocks)

edit:

oops sorry.if you want that many processes then you can

As you have found out yourself the generate is unfolded by compiler into that many processes.

Normally we can use for loop but because you can't put for loop ahead of process then generate is useful here.

The actual purpose of generate is to tell compiler to synthesise or not depending on some condtions but here we borrowed it as loop that always generates