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I've created a block ram generator(single port ROM) in vivado using a coe file in verilog. I'm able to read the values one at time using continuous statement(able to instantiate rom block once a clock pulse). Here is my snippet: module coedata(clk,rst,a); input clk,rst; output [31:0]a; wire[12:0]addra,out; wire [31:0]douta ; count c1(clk,rst,out); // just gives count in 'out' to access address(addra) assign addra=out; blk_mem_gen_0 your_instance_name ( .clka(clk), // input wire clka .addra(addra), // input wire [12 : 0] addra .douta(douta) // output wire [31 : 0] douta ); assign a=douta; endmodule This is ok. I can read value through instantiating once a clock. But I want to store all these values into 2D wire such as [31:0] a[0:100].I want all the values to be available in one clock pulse.(Just assume we have created a sufficient ROM block) module coedata(clk,rst); input clk,rst; reg [31:0]a[0:99]; wire[12:0]addra,out; wire [31:0]douta ; count c1(clk,rst,out,i); // just gives count in 'out-binary' to access,'i-integer' address(addra) assign addra=out; blk_mem_gen_0 your_instance_name ( .clka(clk), // input wire clka .addra(addra), // input wire [12 : 0] addra .douta(douta) // output wire [31 : 0] douta ); assign a=douta; endmodule It is saying that 'i' is not a constant. Thanks in advance.