eliminate concurrent statement

Hi,

I would like to do something like :

if a < b then c <= '1'; else c <= '0'; end fi;

where a and b are SIGNED vectors and c is std_logic.

I get the warning "Illegal concurrent statement" because it is not embedded
inside a process block.

I don't really need the if then else structure to implement what I want.
Basically, I just want the bit corresponding to the sign of a-b to be
connected to c. How can I do this without the if then else statement so that
I don't get the "Illegal concurrent statement" warning.

Thanks.

PS : I am a beginner.

Aji

Aji wrote:
> Hi,
>
> I would like to do something like :
>
> if a < b then c <= '1'; else c <= '0'; end fi;
>
> where a and b are SIGNED vectors and c is std_logic.
>
> I get the warning "Illegal concurrent statement" because it is not embedded
> inside a process block.
>
> I don't really need the if then else structure to implement what I want.
> Basically, I just want the bit corresponding to the sign of a-b to be
> connected to c. How can I do this without the if then else statement so that
> I don't get the "Illegal concurrent statement" warning.
>
> Thanks.
>
> PS : I am a beginner.

c <= '1' when a < b else '0';

charles.elias@wpafb.af.mil

<> a écrit dans le message de news:
om...
>
> Aji wrote:
>> Hi,
>>
>> I would like to do something like :
>>
>> if a < b then c <= '1'; else c <= '0'; end fi;
>>
>> where a and b are SIGNED vectors and c is std_logic.
>>
>> I get the warning "Illegal concurrent statement" because it is not
>> embedded
>> inside a process block.
>>
>> I don't really need the if then else structure to implement what I want.
>> Basically, I just want the bit corresponding to the sign of a-b to be
>> connected to c. How can I do this without the if then else statement so
>> that
>> I don't get the "Illegal concurrent statement" warning.
>>
>> Thanks.
>>
>> PS : I am a beginner.
>
> c <= '1' when a < b else '0';
>
Thank you Charles, I'll try this.

Aji

Aji