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Altera_Forum
Honored Contributor I
705 Views

Assigning value to 7 bits output buffer?

Hi, 

 

I'm doing a Moore FSM, and the outputs are 7 bits buffers (declared as such:  

sum: out STD_LOGIC_VECTOR(6 down to 0); 

 

When writing the output logic, I wrote: 

 

when S2 => sum <= '0001010'; 

 

but that gives me an error for each of these instances. What would be the correct syntax for what I'm trying to do? 

 

Thanks!
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4 Replies
Altera_Forum
Honored Contributor I
11 Views

sum <= "0001010" WHEN S2 = '1'; 

 

Any number that uses more than 1 bit requires double quotes. If that is supposed to be a hex number (not clear but guessing it's binary), you would add an x (x"0001010").
Altera_Forum
Honored Contributor I
11 Views

 

--- Quote Start ---  

you would add an x (x"0001010") 

--- Quote End ---  

 

Since 'sum' is a 7-bit value and x"0001010" represents a 28-bit value (which wouldn't work), stick with sstrel's first solution. 

 

Cheers, 

Alex
Altera_Forum
Honored Contributor I
11 Views

' is used for single characters 

" is used for strings 

 

You need to use "
Altera_Forum
Honored Contributor I
11 Views

Whoops, missed the 7-bit part! Yes, just "0001010".