Re: Booth multiplier

Altera_Forum · ‎11-30-2017

Hey everyone, I have troubles with coding this

Can somebody help me or did somebody this yet?

Create and test the booth multiplier algorithm. The parameter should be the number of input operand bits

thank you ! :)

Altera_Forum · ‎11-30-2017

What problems are you having? why not let us help you rather than expecting other people do your work for you?

Altera_Forum · ‎11-30-2017

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What problems are you having? why not let us help you rather than expecting other people do your work for you?

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Don't worry

really don't know how to continue with that

library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_unsigned.all;
entity RECODER is
    port (
    DIN  : in  std_logic_vector(15 downto 0);
    BIT3 : in  std_logic_vector( 2 downto 0);
    DOUT : out std_logic_vector(16 downto 0));
end RECODER;
architecture RTL of RECODER is
    constant N : integer := 16;
    subtype bitn1 is std_logic_vector(N downto 0);
    
    function COMP2 (D : in bitn1) return bitn1 is
        variable Dn : bitn1; 
        begin Dn := not D;
        return(Dn+1);
        end COMP2;
        
        begin
            process (DIN, BIT3)
                begin 
                    case BIT3 is    
                        when "001" | "010" =>
                            DOUT <= DIN(N-1) & DIN;
                        when "101" | "110" =>
                            DOUT <= COMP2(DIN(N-1) & DIN);
                        when "100" =>
                            DOUT <= COMP2(DIN & '0');
                        when "011" =>
                            DOUT <= DIN & '0';
                        when others =>
                            DOUT <= (DOUT'range => '0');
                        end case;
                    end process;
                end RTL;

Altera_Forum · ‎11-30-2017

And whats the problem?

Altera_Forum · ‎11-30-2017

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And whats the problem?

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It doesn't work , don't know the problem

so it for I asked if somebody did it ;)

Altera_Forum · ‎11-30-2017

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It doesn't work , don't know the problem

so it for I asked if somebody did it ;)

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So how does it 'not work'? Can you provide test case(s) showing inputs, received output, expected output? Do you have a test bench setup?

Altera_Forum · ‎12-01-2017

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So how does it 'not work'? Can you provide test case(s) showing inputs, received output, expected output? Do you have a test bench setup?

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No, I can't do next step, don't know what to do for working this program

Is the code correct?

Altera_Forum · ‎12-01-2017

I have no idea if the code is correct. You need to write a testbench to test the code, and see if it works how you expect.

There are many tutorials out there on how to write a testbench.