Mutually exclusive

[ALuPin]

Hi VHDL folks,

I get the info warning
"Info, conditions are mutually exclusive; resolve without priority."


when compiling the following process:


process(Reset, Clk)
begin
if Reset='1' then
l_speed <= '0';

elsif rising_edge(Clk) then

if Rx_data(3 downto 0)="0100" then
l_speed <= '0';
elsif Rx_data(3 downto 0)="1010" then
l_speed <= '1';
else
l_speed <= l_speed;
end if;
end if;
end process;

What does the info warning mean?

Thank you for your help.

Rgds

 

[Sunil Shukla]

Hi ALuPin,

Probably, the compiler wants you to use mux (using case statement, as the
conditions are mutually exclusive) instead of priority encoder.

Cheers,
Sunil
====================
www.uq.edu.au/~uqsshukl

"ALuPin" <ALuPin@web.de> wrote in message
news:b8a9a7b0.0409070107.4ddf842f@posting.google.com...

Hi VHDL folks,

I get the info warning
"Info, conditions are mutually exclusive; resolve without priority."


when compiling the following process:


process(Reset, Clk)
begin
if Reset='1' then
l_speed <= '0';

elsif rising_edge(Clk) then

if Rx_data(3 downto 0)="0100" then
l_speed <= '0';
elsif Rx_data(3 downto 0)="1010" then
l_speed <= '1';
else
l_speed <= l_speed;
end if;
end if;
end process;

What does the info warning mean?

Thank you for your help.

Rgds

 

[Mike Treseler]

ALuPin@web.de (ALuPin) wrote in message news:<b8a9a7b0.0409070107.4ddf842f@posting.google.com>...

Hi VHDL folks,

I get the info warning
"Info, conditions are mutually exclusive; resolve without priority."

What does the info warning mean?

It means that since the if, elsif, and else
cases don't overlap, this is a logical
classification rather than a prioritization.
This might better be labelled "information" rather
than "warning".

-- Mike Treseler