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[Unity]

I have the following code and been having trouble with a couple of lines which seem to be causing lots of errors.

No feasible entries for infix operator "*".

Original Code.............................................. ..................................

LIBRARY IEEE;
LIBRARY WORK;
USE IEEE.NUMERIC_STD.ALL;
USE WORK.NUMERIC_UNSIGNED.ALL;
USE IEEE.STD_LOGIC_1164.ALL;

ENTITY Bit_Destuff IS PORT (
Clk : IN STD_LOGIC;
G_Rst : IN STD_LOGIC;
Arbtr_Sts : IN STD_LOGIC;
Bit_Destf_Intl : IN STD_LOGIC;
Sampled_Bit : IN STD_LOGIC;
Tx_Success : IN STD_LOGIC;
Rx_Success : IN STD_LOGIC;
Act_Err_Frm_Tx : IN STD_LOGIC;
Psv_Err_Frm_Tx : IN STD_LOGIC;
Ovld_Frm_Tx : IN STD_LOGIC;
Serial_In : OUT STD_LOGIC;
Rx_Crc_Frm : IN STD_LOGIC_VECTOR(14 DOWNTO 0);
Rcvd_Bt_Cnt : OUT STD_LOGIC_VECTOR(6 DOWNTO 0);
De_Stuff : OUT STD_LOGIC;
One_Count : OUT STD_LOGIC_VECTOR(2 DOWNTO 0);
Zero_Count : OUT STD_LOGIC_VECTOR(2 DOWNTO 0);
Rcvd_Eof_Flg : OUT STD_LOGIC;
Rcvd_Msg_ID : OUT STD_LOGIC_VECTOR(10 DOWNTO 0);
Rcvd_Rtr : OUT STD_LOGIC;
Rcvd_Dlc : OUT STD_LOGIC_VECTOR(3 DOWNTO 0);
Rcvd_Crc : OUT STD_LOGIC_VECTOR(14 DOWNTO 0);
Rx_Crc_Intl : OUT STD_LOGIC;
Rx_Crc_Enable : OUT STD_LOGIC;
Rcvd_Data_Len : OUT STD_LOGIC_VECTOR(6 DOWNTO 0);
Rcvd_Data_Frm : OUT STD_LOGIC_VECTOR(63 DOWNTO );
Rcvd_Lst_Bit_Ifs : OUT STD_LOGIC;
Rcvd_Crc_Flg : OUT STD_LOGIC;
Rcvd_Lst_Bit_EOF : OUT STD_LOGIC);
END ENTITY Bit_Destuff;

------------------------------------------------------------------
SIGNAL Destf_Out : UNSIGNED (63 DOWNTO 0);
SIGNAL Rcvd_Data_Frm_Pad : UNSIGNED (6 DOWNTO 0);
SIGNAL Rcvd_Frm_Len : UNSIGNED(6 DOWNTO 0);
SIGNAL Rcvd_Data_Len_Xhdl7 : UNSIGNED (6 DOWNTO 0);
----------------------------------------------------------------------
Destf_Out_3 <= ("0001000" * Destf_Out(3));
----------------------------------------------------------------------
-- BLOCK TO CALCULATE THE RECEIVED FRAME LENGTH AND RECEIVED DATA LENGTH

PROCESS (Clk, G_Rst)
BEGIN
IF (G_Rst = '1') THEN
Rcvd_Frm_Len <= "0000000";
Rcvd_Data_Len_Int <= "0000000";
Rcvd_Data_Frm_Pad <= "1000000";

ELSIF (Clk'EVENT AND Clk = '1') THEN
IF ((Rx_Success OR Tx_Success) = '1') THEN
Rcvd_Frm_Len <= "0000000";
Rcvd_Data_Len_Int <= "0000000";
Rcvd_Data_Frm_Pad<= "1000000";
ELSE
IF (Rcvd_Rtr_Int10 = '1') THEN
Rcvd_Data_Len_Int7 <= "0000000";
Rcvd_Data_Frm_Pad <= "1000000";
Rcvd_Frm_Len <= "0100010";
ELSE
IF ((Rcvd_Rtr_Int10 = '0') AND (Rcvd_Bt_Cnt_Int2 = "0010101")) THEN
Rcvd_Data_Len_Int7 <= "0001000" * ("0001000" * Destf_Out(3) + "0000100" * Destf_Out(2) + "0000010" * Destf_Out(1) + "0000001" * Destf_Out(0));
Rcvd_Data_Frm_Pad <= "1000000" - ("0001000" * ("0001000" * Destf_Out(3) + "0000100" * Destf_Out(2) + "0000010" * Destf_Out(1) + "0000001" * Destf_Out(0)));
Rcvd_Frm_Len <= "0010011" + ("0001000" * ("0001000" * Destf_Out (3) + "0000100" * Destf_Out (2) + "0000010" * Destf_Out(1) + "0000001" * Destf_Out(0))) + "0001111";
ELSE
Rcvd_Frm_Len <= Rcvd_Frm_Len;
END IF;
END IF;
END IF;
END IF;
END PROCESS;


Sorry!!! The code is very long!!! This is just a small part of it. Any help will be appreciated.

I have another example in the reply thread below. It has the same problem eventhough it uses the Unsigned Function to do the conversion first before multiplying.

[guarana5]

you'll have to cast the values. you can't multiply bit-vectors.

[Unity]

guarana5,

Thanks for the reply. Here is another simpler example which should be straight forward. In this example I tried using the multipication function with first converting them to unsigned and then multiplying them. It should work but once again it doesn't. I'm going crazy

library ieee;
use ieee.numeric_std.all;
use ieee.std_logic_1164.all;

entity testmultun is
port (
q : out std_logic_vector(63 downto 0);
d1 : in std_logic_vector(31 downto 0);
d2 : in std_logic_vector(15 downto 0));
end entity testmultun;

architecture rtl of testmultun is
signal d1_32un : unsigned(31 downto 0);
signal d2_16un : unsigned(15 downto 0);
Signal d3_test : unsigned (15 downto 0);
signal mult_63un : unsigned(47 downto 0);
begin -- architecture rtl
d1_32un <= unsigned(d1);
d2_16un <= unsigned(d2);
d3_test <= unsigned (d1(3)* d2); -------->>> Error: No feasible entries for infix operator "*"

mult_63un <= d1_32un * d2_16un * d3_test;
q <= std_logic_vector(mult_63un);

end architecture rtl;

[guarana5]

hej unity!

Originally Posted by Unity

d3_test <= unsigned (d1(3)* d2); -------->>> Error: No feasible entries for infix operator "*"

in this line you are multiplying std_logic_vectors and trying to cast the result of the multiplication to unsigned - that doesn't work! you have to cast the operands, not the result, as you did here:

Originally Posted by Unity

mult_63un <= d1_32un * d2_16un * d3_test;

but be careful in regard to size of operands and target!