Re: When do I always put a "else NULL" statement in my VHDL code?

[Kelvin]

u had better put something in the else{}, otherwise you get a latch.

 

[Kelvin]

In the first if statement, "if rst = '1' then count <= 0; elsif clk'event
and clk = '1' then", you don't need an "else" if I remember the syntax
correctly.
In second if statement, you may replace the null with assignments, just to
make the statement complete. for example,

if rst = '1' then
count <= 0;
elsif clk'event and clk = '1' then
if (INPUTEND = '1') then
...
A <= B+C;
else
-- null;
A <= A;
end if;
-- else
-- null;
end if;