problem with sll

[Volker]

Hello,

I wrote a small code, but Quartus doesnt compile it. The error message is:
Error (10327): VHDL error at ADR_DEC.vhd(27): can't determine definition of
operator ""sll"" -- found 0 possible definitions

The code:
library IEEE;
use IEEE.STD_LOGIC_1164.all;
use IEEE.STD_LOGIC_ARITH.all;
use IEEE.STD_LOGIC_UNSIGNED.all;
use IEEE.NUMERIC_STD.all;

entity ADR_DEC is
port(ADR : in STD_LOGIC_VECTOR(2 downto 0);
nCS_FPGA: in STD_LOGIC;
nCS : out STD_LOGIC_VECTOR(7 downto 0));
end ADR_DEC;

architecture BEHAVIOR of ADR_DEC is

begin
--
DECODER: process(nCS_FPGA)
begin
if (nCS_FPGA'EVENT and nCS_FPGA= '0') then
nCS <= "00000001" sll CONV_INTEGER(ADR);
else
nCS <= "00000000";
end if;
end process DECODER;


end BEHAVIOR;

Can anybody help me?
Thanks
Volker

 

[Mike Treseler]

I wrote a small code, but Quartus doesnt compile it. The error message is:
Error (10327): VHDL error at ADR_DEC.vhd(27): can't determine definition of
operator ""sll"" -- found 0 possible definitions

Nothing will compile it.
let's look up numeric_std.sll:

-- Id: S.9
function "sll" (ARG : UNSIGNED; COUNT: INTEGER) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)
-- Id: S.10
function "sll" (ARG : SIGNED; COUNT: INTEGER) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)

Note it's only defined for signed or unsigned.

Here's my cut at fixing up your code.
There were a few other problems.

http://home.comcast.net/~mike_treseler/adr_dec.vhd
http://home.comcast.net/~mike_treseler/adr_dec.pdf

-- Mike Treseler

 

[Jim Lewis]

Hi,
Summary: SLL, SRL, SLA, SRA are not defined for std_logic_vector

In the Accellera VHDL-2006 revision, SLL and SRL are defined for
std_logic_vector. This is an Accellera approved standard, so
ask your vendor to implement it.

Cheers,
Jim

 

[Andy Peters]

Hello,

I wrote a small code, but Quartus doesnt compile it. The error message is:
Error (10327): VHDL error at ADR_DEC.vhd(27): can't determine definition of
operator ""sll"" -- found 0 possible definitions

The code:
library IEEE;
use IEEE.STD_LOGIC_1164.all;
use IEEE.STD_LOGIC_ARITH.all;
use IEEE.STD_LOGIC_UNSIGNED.all;
use IEEE.NUMERIC_STD.all;

Why are you including both std_logic_arith/unsigned and numeric_std?

-a

 

[VHDL_HELP]

Why are you including both std_logic_arith/unsigned and numeric_std?

-a

salut,
d'après que j'ai vu j'avais le même problème : en fait sll fonctinne
avec des bit_vector et non std_logic_vector
j'espere que je vous servi