yosys/tests/arch/ice40/spram.v

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Verilog
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module top (clk, write_enable, read_enable, write_data, addr, read_data);
parameter DATA_WIDTH = 8;
parameter ADDR_WIDTH = 8;
parameter SKIP_RDEN = 1;
input clk;
input write_enable, read_enable;
input [DATA_WIDTH - 1 : 0] write_data;
input [ADDR_WIDTH - 1 : 0] addr;
output [DATA_WIDTH - 1 : 0] read_data;
(* ram_style = "huge" *)
reg [DATA_WIDTH - 1 : 0] mem [2**ADDR_WIDTH - 1 : 0];
always @(posedge clk) begin
if (write_enable)
mem[addr] <= write_data;
else if (SKIP_RDEN || read_enable)
read_data <= mem[addr];
end
endmodule