Generate instances from another module in always @(posedge clk)

Question

module save_random (clk,in,out);

parameter size=10;
parameter k=10;
 input clk;
 input [k-1:0] in;

 output [k-1:0]out;
 wire [size:0] cout;

 genvar i;     
generate

for(i=0;i<size;i=i+1)
begin: level1
always@(posedge clk) begin

 random ins(clk,in[i],cout[i+1]);//generte 10 instances from module random to save it //in registers
 end
end

endgenerate
assign cout[0]=in[0];
assign out=cout[k];
endmodule

I have a task to write synthesis code that generates 10 random values and save each value in register or Dflipflop or something like this.

The first (save_random) module that generates 10 instances from module random (the 2nd one) and connected .., but it still has error when I am using clk input with generate i..

module random(clk,d,cout);
 
 parameter size=8;
 input [size-1:0] d;    
 input clk;

output  [size-1:0]cout;
reg  [size-1:0]cout;
integer i;

always@(posedge clk)
begin
     cout<=d;
end 
endmodule

Unn · Accepted Answer · 2014-11-21 21:34:36Z

2

You cannot instantiate modules inside an always block. As you have a module random which is a register of size size, you only need to instantiate that module inside your generate if you need more than one:

genvar i;     
generate begin
  for(i=0;i<size;i=i+1) begin: level1
    random ins(clk,in[i],cout[i+1]);
  end
end

However, note that in[i] and cout[i+1] are not an 8-bit values. So if you want to use the full 8-bit register, you need to declare them to be 10 (or 11 for cout) 8-bit vectors:

input [7:0] in [9:0];
wire [7:0] cout [10:0];

This tutorial might give you a better idea how generate blocks work: https://www.youtube.com/watch?v=5CKfP4n9ge0

answered Nov 21, 2014 at 21:34

Unn

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