Comparing more than one bits?

[Rob]

Hi

I wann do a simpe comparison, to see if 6 bits of my bus have a certain
value. However, the codefragmet below does not work to my surpirse.
Anyone an idea what I am missing? must be simple, the error message says
no feasable entries for infix op: =

if ( clk = '1' and clk'event ) then
if (data_bus(31 downto 26)="100011") then
...


Thanks in advance,
R.

 

[rickman]

Hi

I wann do a simpe comparison, to see if 6 bits of my bus have a certain
value. However, the codefragmet below does not work to my surpirse.
Anyone an idea what I am missing? must be simple, the error message says
no feasable entries for infix op: =

if ( clk = '1' and clk'event ) then
if (data_bus(31 downto 26)="100011") then
...

Thanks in advance,
R.

How is data_bus declared? If it is std_logic_vector, this looks good
to me. The error message is saying that it can't find a version of
'=' that uses the two operand types and produces a boolean which is
required by the IF. Did you include the libraries?

Rick

 

[Rob]

How is data_bus declared? If it is std_logic_vector, this looks good
to me. The error message is saying that it can't find a version of
'=' that uses the two operand types and produces a boolean which is
required by the IF. Did you include the libraries?

It is declared as unsigned...so in this case I cant compare bitwise I
assume. But I could cast it to std_logic_vector, couldnt I?

 

[rickman]

It is declared as unsigned...so in this case I cant compare bitwise I
assume. But I could cast it to std_logic_vector, couldnt I?

I didn't think that was necessary. unsigned is compatible with string
literals. No?

Rick