This is a combinational circuit. Read the simulation waveforms to determine what the circuit does, then implement it.

module top_module (
    input a,
    input b,
    output q );//

    assign q = a&b; // Fix me

endmodule

 This is a combinational circuit. Read the simulation waveforms to determine what the circuit does, then implement it

module top_module (
    input a,
    input b,
    input c,
    input d,
    output q );//
    assign q=~a&~b&~c&~d|~a&~b&c&d|~a&b&~c&d|~a&b&c&~d|a&~b&~c&d|a&~b&c&~d|a&b&~c&~d|a&b&c&d; // Fix me
endmodule

 This is a combinational circuit. Read the simulation waveforms to determine what the circuit does, then implement it.

module top_module (
    input a,
    input b,
    input c,
    input d,
    output q );//
    assign q=b&d|b&c|a&d|a&c; // Fix me
endmodule

 This is a combinational circuit. Read the simulation waveforms to determine what the circuit does, then implement it.

module top_module (
    input a,
    input b,
    input c,
    input d,
    output q );//
    assign q=b|c; // Fix me
endmodule

 This is a combinational circuit. Read the simulation waveforms to determine what the circuit does, then implement it.

多路选择器，c选择。

module top_module (
    input [3:0] a,
    input [3:0] b,
    input [3:0] c,
    input [3:0] d,
    input [3:0] e,
    output [3:0] q );
    always @(*) begin
        case(c)
            4'd0:q<=b;
            4'd1:q<=e;
            4'd2:q<=a;
            4'd3:q<=d;
            default:q<=4'hf;
         endcase
    end
endmodule

 This is a combinational circuit. Read the simulation waveforms to determine what the circuit does, then implement it.

module top_module (
    input [2:0] a,
    output [15:0] q ); 
    always @(*) begin
        case(a)
            3'd0:q<=16'h1232;
            3'd1:q<=16'haee0;
            3'd2:q<=16'h27d4;
            3'd3:q<=16'h5a0e;
            3'd4:q<=16'h2066;
            3'd5:q<=16'h64ce;
            3'd6:q<=16'hc526;
            default:q<=16'h2f19;
        endcase
    end
endmodule

 This is a sequential circuit. Read the simulation waveforms to determine what the circuit does, then implement it.

module top_module (
    input clk,
    input a,
    output q );
    always @(posedge clk) begin
       q<=~a; 
    end
endmodule

This is a sequential circuit. Read the simulation waveforms to determine what the circuit does, then implement it

 p为a在clock为高电平时的选通信号，q为clock下降沿触发的信号，存放p的值。

module top_module (
    input clock,
    input a,
    output p,
    output q );
    assign p=clock?a:p;
    always @(negedge clock) begin
        q<=p;
    end
endmodule

This is a sequential circuit. Read the simulation waveforms to determine what the circuit does, then implement it.

module top_module (
    input clk,
    input a,
    output [3:0] q );
    always @(posedge clk) begin
        if(a)
            q<=4'd4;
        else if(q==4'd6)
            q<=4'd0;
        else if(!a)
            q<=q+1'd1; 
        else
            q<=q;
    end
endmodule

This is a sequential circuit. The circuit consists of combinational logic and one bit of memory (i.e., one flip-flop). The output of the flip-flop has been made observable through the output state.

Read the simulation waveforms to determine what the circuit does, then implement it.

module top_module (
    input clk,
    input a,
    input b,
    output q,
    output state  );
    always @(posedge clk) begin
        if(a&b) 
            state<=1'b1;  
        else if(~a&~b) 
            state<=1'b0;
        else 
            state<=state;
    end
    assign q=a^b^state; 
endmodule