Initializing Block RAM From an External Data File (Verilog) - 2024.1 English

Vivado Design Suite User Guide: Synthesis (UG901)

Document ID
UG901
Release Date
2024-05-30
Version
2024.1 English

Filename: rams_init_file.v

// Initializing Block RAM from external data file
// Binary data
// File: rams_init_file.v

module rams_init_file (clk, we, addr, din, dout);
input clk;
input we;
input [5:0] addr;
input [31:0] din;
output [31:0] dout;

reg [31:0] ram [0:63];
reg [31:0] dout;

initial begin
$readmemb("rams_init_file.data",ram);
end

always @(posedge clk)
begin
if (we)
ram[addr] <= din;
dout <= ram[addr];
end endmodule

Note: The external file initializing the RAM needs to be in bit vector form. External files in integer or hex format do not work.