giving value to a constant

qwerty_asdf · Apr 17, 2012

I have this:

Code:

constant offset_A: std_logic_vector(address_length+1 downto 0) :="01"&(others=>'0');
constant offset_B: std_logic_vector(address_length+1 downto 0) := "10"&(others=>'0');

but of course is not acceptable by compiler.

Can you suggest me an alternative way?

address_length is a generic so it can be used if you wish. What I want is obvious, give a value to the first 2 bits and the rest of them be '0'.

The error I get is:

Code:

 OTHERS aggregate cannot be operand of operator with unconstrained array formal.

TrickyDicky · Apr 17, 2012

constant offset_A : std_logic_vector(address_length+1 downto 0) := (address_length+1 downto address_length => "01", others => '0' );

qwerty_asdf · Apr 17, 2012

TrickyDicky said:
constant offset_A : std_logic_vector(address_length+1 downto 0) := (address_length+1 downto address_length => "01", others => '0' );

I get this error:

Code:

Error: C:/Modeltech_pe_edu_10.1a/examples/landmark_1.vhd(97): String literal found where non-array type ieee.std_logic_1164.STD_LOGIC was expected.
** Warning: C:/Modeltech_pe_edu_10.1a/examples/landmark_1.vhd(97): (vcom-1073) Non-locally static choice (association #1, choice #1) is allowed only if it is the only choice of the only association.

TrickyDicky · Apr 18, 2012

try this:

constant offset_A : std_logic_vector(address_length+1 downto 0) := (address_length => '1', others => '0' );

qwerty_asdf · Apr 18, 2012

TrickyDicky said:
try this:

constant offset_A : std_logic_vector(address_length+1 downto 0) := (address_length => '1', others => '0' );

This works. i only get the warning.

giving value to a constant

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giving value to a constant

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