Error 12014 quartus

I’m designing a relatively simple circuit. Using two 4 to 2 encoders to realize an 8 to 3 encoder. Only been learning VHDL the last month. I don’t know what this error means. I’ve done similar circuits without error so I’m not sure what the difference is. 

Error (12014): Net «a», which fans out to «a», cannot be assigned more than one value 

Error (12015): Net is fed by «ENCODER4X2:M1|a» 

Error (12015): Net is fed by «ENCODER4X2:M2|a» 

Error (12014): Net «b», which fans out to «b», cannot be assigned more than one value 

Error (12015): Net is fed by «ENCODER4X2:M1|b» 

Error (12015): Net is fed by «ENCODER4X2:M2|b» 

top design: 

LIBRARY ieee; 

USE ieee.std_logic_1164.all; 

Entity ENCODER8X3 IS 

PORT (i0, i1, i2, i3, i4, i5, i6, i7 : IN STD_LOGIC; 

error 12014 -> a, b, c, d : OUT STD_LOGIC); 

END ENCODER8X3; 

ARCHITECTURE STRUCT OF ENCODER8X3 IS 

signal w1 : std_LOGIC; 

COMPONENT ENCODER4X2 

PORT (i0, i1, i2, i3 : IN STD_LOGIC; 

a, b, c : OUT STD_LOGIC); 

END COMPONENT; 

BEGIN 

w1 <= not (i0 OR i2 OR i4 OR i6); 

M1: ENCODER4X2 PORT MAP (i0, i2, i4, i6, a, b, w1);  

M2: ENCODER4X2 PORT MAP (i1, i3, i5, i7, a, b, d); 

END STRUCT; 

slave device: 

LIBRARY ieee; 

USE ieee.std_logic_1164.all; 

ENTITY ENCODER4X2 IS 

PORT (i0, i1, i2, i3 : IN STD_LOGIC; 

​error 12015 -> a, b, c : OUT STD_LOGIC); 

END ENCODER4X2; 

ARCHITECTURE STRUCT OF ENCODER4X2 IS  

BEGIN 

a <= i3 OR i2; 

b <= (i1 AND (NOT i2)) OR i3; 

c <= i0 OR i1 OR i2 OR i3; 

END STRUCT; 

It’s probably some stupid mistake that I’m overlooking. I hope so. Any help is appreciated.

Error net is fed by

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• Re: Error (12014): Net «a», which fans out to «a», cannot be assigned more than one value

Error (12014): Net «a», which fans out to «a», cannot be assigned more than one value

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I’m designing a relatively simple circuit. Using two 4 to 2 encoders to realize an 8 to 3 encoder. Only been learning VHDL the last month. I don’t know what this error means. I’ve done similar circuits without error so I’m not sure what the difference is.

Error (12014): Net «a», which fans out to «a», cannot be assigned more than one value

Error (12015): Net is fed by «ENCODER4X2:M1|a»

Error (12015): Net is fed by «ENCODER4X2:M2|a»

Error (12014): Net «b», which fans out to «b», cannot be assigned more than one value

Error (12015): Net is fed by «ENCODER4X2:M1|b»

Error (12015): Net is fed by «ENCODER4X2:M2|b»

Entity ENCODER8X3 IS

PORT (i0, i1, i2, i3, i4, i5, i6, i7 : IN STD_LOGIC;

error 12014 -> a, b, c, d : OUT STD_LOGIC);

Источник

Error net is fed by

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• Error (12014): Net «a», which fans out to «a», cannot be assigned more than one value

Error (12014): Net «a», which fans out to «a», cannot be assigned more than one value

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I’m designing a relatively simple circuit. Using two 4 to 2 encoders to realize an 8 to 3 encoder. Only been learning VHDL the last month. I don’t know what this error means. I’ve done similar circuits without error so I’m not sure what the difference is.

Error (12014): Net «a», which fans out to «a», cannot be assigned more than one value

Error (12015): Net is fed by «ENCODER4X2:M1|a»

Error (12015): Net is fed by «ENCODER4X2:M2|a»

Error (12014): Net «b», which fans out to «b», cannot be assigned more than one value

Error (12015): Net is fed by «ENCODER4X2:M1|b»

Error (12015): Net is fed by «ENCODER4X2:M2|b»

Entity ENCODER8X3 IS

PORT (i0, i1, i2, i3, i4, i5, i6, i7 : IN STD_LOGIC;

error 12014 -> a, b, c, d : OUT STD_LOGIC);

Источник

Strange error in Quartus II 3.0

Panic

After searching for the source of an error for quite a long time, I’ve
decided that I need some help, and once again you guys drew the shortest
straw 😉

I have a 8 bit DFF with output q[7..0]. This feeds the net
dff_inst23_out[7..0]. (The reason this net is given this name, was to see if
the error actually was located where I thought it was, since the original
error pointed to some temp net.) Both the DFF output and the net is 8 bits
wide, and still I get this error message:

Error: Net dff_inst23_out[6] cannot be assigned more than one value
Error: Net is fed by std_8bit_dff0:inst8|lpm_ff:lpm_ff_component|dffs[6]
Error: Net is fed by std_8bit_dff0:inst9|lpm_ff:lpm_ff_component|dffs[6]
Error: Net is fed by std_8bit_dff0:inst23|lpm_ff:lpm_ff_component|dffs[6]

This is repeated for each bit of dff_inst23_out.

Ok, so I have two other registers that feed this net, but they are not
connected! I understand that this is happening because the output of these
other registers are the same as the inst23 one, but hey, I’ve got more
registers like that, all over the place! So why is this happening to this
particular net?

I’ve taken a screenshot of the design in question, and my troublesome net is
the blue stub:
http://www.battlefield.no/bilder/inst23.gif

Any suggestions would be appreaciated!
Sincerely
-«Panic»

Источник

Help needed on VHDL code.

kokei74

Junior Member level 3

hi, im quite new to VHDL and currently is learning now. I try to create a D flip flop with enable from a D flip flop using a port map.

here is VHDL for DFF

library ieee;
use ieee.std_logic_1164.all;

entity dfflop is
port (D,clock :IN std_logic;
Q :OUT std_logic);
end dfflop;

architecture logic of dfflop is
begin
process (clock)
begin
if clock’event AND clock = ‘1’ THEN
Q

kvingle

Full Member level 5

You are getting this error because you are trying to read the output port Qo which is not permitted .
Solve this by defining an internal signal. below is the code.

kokei74

Junior Member level 3

i tried to used ur code but error still occur.

0″, which fans out to «Q0», cannot be assigned more than one value
Error: Net is fed by «comb

0″
Error: Net is fed by «dfflop:stage0|Q»

what thus that mean?

kvingle

Full Member level 5

kokei74

Junior Member level 3

its work fine. Thx a lot.

but maybe i will need ur help again. Ater this i want to combine this Dff to create a register.

kokei74

Junior Member level 3

hi again..
suppose when EN = 1 the the data on 4 input is transfer into the register with the next positive clock edge. when EN = 0 the current value remains in the register at the next positive clock edge. So EN will determine whether the next pulse accepts new information or leave the information in the register . From my simulation why does the output 0100, 0101, 0110 did`t come out after 0011 but it skip to 0111 and suppose when EN = 0 after that it should preserve 0111 until the next positive clock edge.

VHDL for register

library ieee;
use ieee.std_logic_1164.all;

port ( A :IN std_logic_vector (3 downto 0);
Load,clk :IN std_logic;
X :OUT std_logic_vector (3 downto 0));

architecture logic of reg is

component DFF_en
port (EN,D0,C :IN std_logic;
Q0 :OUT std_logic);
end component;

stage0 : DFF_en port map ( A(0),Load,clk,X(0));
stage1 : DFF_en port map ( A(1),Load,clk,X(1));
stage2 : DFF_en port map ( A(2),Load,clk,X(2));
stage3 : DFF_en port map ( A(3),Load,clk,X(3));

Источник

Error net is fed by

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• Warning (15610): No output dependent on input pin

Warning (15610): No output dependent on input pin

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I’m designing a functional unit of DP. I’m getting these warnings for no reason. Is there anybody can help me with it. Any help will be really appreciated.

Note: I attached the project archive.

Warning (15610): No output dependent on input pin «TAU_A»

Warning (15610): No output dependent on input pin «TAU_B»

Warning (15610): No output dependent on input pin «TAU_C»

Warning (15610): No output dependent on input pin «TSR_A»

Warning (15610): No output dependent on input pin «TSR_B»

Warning (15610): No output dependent on input pin «TSR_C»

Warning (15610): No output dependent on input pin «ld_tau»

Warning (15610): No output dependent on input pin «ld_tsr»

Warning (15610): No output dependent on input pin «oper_sel0»

Warning (15610): No output dependent on input pin «oper_sel1»

Warning (15610): No output dependent on input pin «oper_sel2»

Warning (15610): No output dependent on input pin «oper_sel3»

Warning (15610): No output dependent on input pin «oper_sel4»

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The reason is simple and can be seen in the below always block. There are multiple assignments to each x_bus_out, but only the last takes place.

always @ (TAU_A, TAU_B, TAU_C, TSR_A, TSR_B, TSR_C, TR_A, TR_B, TR_C, tau_w2, tsr_w2, tr_w2) begin if(TAU_A == 1) begin A_bus_out = tau_w2; end else begin A_bus_out = 12’hzzz; end if(TAU_B == 1) B_bus_out = tau_w2; else B_bus_out = 12’hzzz; if(TAU_C == 1) C_bus_out = tau_w2; else C_bus_out = 12’hzzz; ///////////////////////// if(TSR_A == 1) A_bus_out = tsr_w2; else A_bus_out = 12’hzzz; if(TSR_B == 1) B_bus_out = tsr_w2; else B_bus_out = 12’hzzz; if(TSR_C == 1) C_bus_out = tsr_w2; else C_bus_out = 12’hzzz; ////////////////////////// if(TR_A) A_bus_out = tr_w2; else A_bus_out = 12’hzzz; if(TR_B) B_bus_out = tr_w2; else B_bus_out = 12’hzzz; if(TR_C) C_bus_out = tr_w2; else C_bus_out = 12’hzzz; end

You probably meaned to write (and similar for the other outputs):

if(TAU_A == 1) A_bus_out = tau_w2; else if(TSR_A == 1) A_bus_out = tsr_w2; else if(TR_A) A_bus_out = tr_w2; else A_bus_out = 12’hzzz;

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Thank you so much FvM. Yes, you are right.

The warnings disappeared and it replaced by new errors that do not make sense to me.

I connected the same wire to several blocks and I got these errors.

It shows only for these two blocks that mentioned below. I did the same for others, but it does not show as an error.

I attached the new project and thank you again for your time.

Error (12014): Net «tr_w1[11]», which fans out to «FU_reg:TR_reg_Inst|in0[11]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[23]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[11]»

Error (12014): Net «tr_w1[10]», which fans out to «FU_reg:TR_reg_Inst|in0[10]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[22]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[10]»

Error (12014): Net «tr_w1[9]», which fans out to «FU_reg:TR_reg_Inst|in0[9]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[21]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[9]»

Error (12014): Net «tr_w1[8]», which fans out to «FU_reg:TR_reg_Inst|in0[8]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[20]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[8]»

Error (12014): Net «tr_w1[7]», which fans out to «FU_reg:TR_reg_Inst|in0[7]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[19]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[7]»

Error (12014): Net «tr_w1[6]», which fans out to «FU_reg:TR_reg_Inst|in0[6]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[18]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[6]»

Error (12014): Net «tr_w1[5]», which fans out to «FU_reg:TR_reg_Inst|in0[5]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[17]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[5]»

Error (12014): Net «tr_w1[4]», which fans out to «FU_reg:TR_reg_Inst|in0[4]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[16]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[4]»

Error (12014): Net «tr_w1[3]», which fans out to «FU_reg:TR_reg_Inst|in0[3]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[15]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[3]»

Error (12014): Net «tr_w1[2]», which fans out to «FU_reg:TR_reg_Inst|in0[2]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[14]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[2]»

Error (12014): Net «tr_w1[1]», which fans out to «FU_reg:TR_reg_Inst|in0[1]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[13]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[1]»

Error (12014): Net «tr_w1[0]», which fans out to «FU_reg:TR_reg_Inst|in0[0]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_mul_1:amz_mul_1_inst|result[12]»

Error (12015): Net is fed by «amz_div_1:amz_div_1_inst|remain[0]»

Error (12014): Net «overflow_sig», which fans out to «FU_reg:TSR_reg_Inst|in0[9]», cannot be assigned more than one value

Error (12015): Net is fed by «amz_add_sub_1:amz_add_sub_1_inst|overflow»

Error (12015): Net is fed by «amz_log_shift:amz_log_shift_inst|overflow»

Error (12015): Net is fed by «amz_arith_shift:amz_arith_shift_inst|overflow»

Error: Quartus II 64-Bit Analysis & Synthesis was unsuccessful. 40 errors, 1 warning

Error: Peak virtual memory: 435 megabytes

Error: Processing ended: Thu Feb 27 10:34:49 2014

Error: Elapsed time: 00:00:02

Error: Total CPU time (on all processors): 00:00:02

Источник

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;

entity testbench is
    port
    (
        reset   :in std_logic;
        clk :in std_logic;
        mode    :in std_logic;

        inport  :in std_logic_vector(7 downto 0);
        outport :out std_logic_vector(7 downto 0);

        data    :inout std_logic_vector(15 downto 0);
        address :in std_logic_vector(2 downto 0);
        load    :in std_logic;
        debug   :in std_logic
    );
end testbench;

architecture main of testbench is
    component divider
        port(rst, clkin: in std_logic;
        clkout: out std_logic);
    end component;
    component ram
        port(en, r, w   :in std_logic;
        data        :inout std_logic_vector(15 downto 0);
        address         :in std_logic_vector(2 downto 0));
    end component;
    component microprocessor
        port
        (
            reset   :in std_logic;
            clk     :in std_logic;
            data    :inout std_logic_vector(15 downto 0);
            address     :out std_logic_vector(11 downto 0);
            memr    :out std_logic;
            memw    :out std_logic;
            inport  :in std_logic_vector(7 downto 0);
            outport     :out std_logic_vector(7 downto 0);
            intr_in :in std_logic;              -- interrupt for input
            intr_out    :in std_logic               -- interrupt for output
        );
    end component;
    component ebscu
        port
        (
            mode:       in std_logic;

            mpdata: inout std_logic_vector(15 downto 0);
            mpaddress:  in std_logic_vector(11 downto 0);
            userdata:       inout std_logic_vector(15 downto 0);
            useraddress:    in std_logic_vector(2 downto 0);
            ramdata:    inout std_logic_vector(15 downto 0);
            ramaddress: out std_logic_vector(2 downto 0);

            mpread:     in std_logic;
            mpwrite:        in std_logic;
            userread:       in std_logic;
            userwrite:  in std_logic;
            ramread:        out std_logic;
            ramwrite:       out std_logic
        );
    end component;
    signal internclk        :std_logic;
    signal mpreset      :std_logic;
    signal databus1     :std_logic_vector(15 downto 0);
    signal databus2     :std_logic_vector(15 downto 0);
    signal databus3     :std_logic_vector(15 downto 0);
    signal databus4     :std_logic_vector(15 downto 0);
    signal addressbus1  :std_logic_vector(11 downto 0);
    signal addressbus2  :std_logic_vector(2 downto 0);
    signal read1, write1    :std_logic;
    signal read2, write2    :std_logic;
    signal intr_in, intr_out    :std_logic;

    begin
    mpreset <= reset or mode;
    process(databus1)
        variable busvar: std_logic_vector(15 downto 0);
        begin
        busvar := databus1;
        databus2 <= busvar;
    end process;
    process(databus2)
        variable busvar: std_logic_vector(15 downto 0);
        begin
        busvar := databus2;
        databus1 <= busvar;
    end process;
    process(databus3)
        variable busvar: std_logic_vector(15 downto 0);
        begin
        busvar := databus3;
        databus4 <= busvar;
    end process;
    process(databus4)
        variable busvar: std_logic_vector(15 downto 0);
        begin
        busvar := databus4;
        databus3 <= busvar;
    end process;
    d1: divider         port map(reset, clk, internclk);
    d2: microprocessor  port map(mpreset, internclk, databus1, addressbus1, read1, write1, inport, outport, intr_in, intr_out);
    d3: ebscu       port map(mode, databus2, addressbus1, data, address, databus3, addressbus2, read1, write1, debug, load, read2, write2);
    d4: ram         port map('1', read2, write2, databus4, addressbus2);
end main;

1 ответ

So below is my priority circuit module

module  prm (input  logic                   D,  A,  E,  F,
             output logic       [3:0]                   y);
    
    always_comb
        
        if      (D) y   =   4'b1000;
        else if (A) y   =   4'b0100;
        else if (E) y   =   4'b0010;
        else if (F) y   =   4'b0001;
        else        y   =   4'b0000;
        
endmodule

and I need its output to be linked with the input of seven segment module

module  segprm  (input  logic       [3:0]       y,
                 output logic       [6:0]       seg);
                         
    prm prm1 (.y(y));
    
    always_comb
        
        case    (y)
        
            1000:   seg =   7'b000_0000;
            0100:   seg =   7'b100_1100;
            0010:   seg =   7'b000_0110;
            0001:   seg =   7'b100_1111;
            
            default:    seg =   7'b111_1111;
            
        endcase
        
endmodule

My thought was to create an instance and link output y of prm to input y of segprm using ports

prm prm1 (.y(y));

but I get these errors and I can’t think any other way to connect these modules together

Error (12014): Net «y[3]», which fans out to «Equal0», cannot be assigned more than one value

Error (12015): Net is fed by «prm:prm1|y[3]»

Error (12015): Net is fed by «y[3]»

Error (12014): Net «y[2]», which fans out to «Equal0», cannot be assigned more than one value

Error (12015): Net is fed by «prm:prm1|y[2]»

Error (12015): Net is fed by «y[2]»

Error (12014): Net «y[1]», which fans out to «Equal0», cannot be assigned more than one value

Error (12015): Net is fed by «prm:prm1|y[1]»

Error (12015): Net is fed by «y[1]»

Error (12014): Net «y[0]», which fans out to «Equal0», cannot be assigned more than one value

Error (12015): Net is fed by «prm:prm1|y[0]»

Error (12015): Net is fed by «y[0]»

Note1: I’m using Quartus Prime Lite Edition

Note2: I must use only prm and for top level hierarchy segprm