pico-ice-video/ice/spram.sv

module spram
(
	input wire clk,
	input wire [3:0] we,
	input wire [13:0] addr,
	input wire [15:0] data_in,
	output wire [15:0] data_out
);

`ifdef VERILATOR
reg [15:0] mem[16384];

reg [15:0] data_out_r;

always_ff @(posedge clk) begin
	integer i;
	for (i = 0; i < 4; i = i + 1) begin
		if (we[i]) begin
			mem[addr][(3+4*i)+:4] <= data_in[(3+4*i)+:4];
		end
	end
	
	data_out_r <= mem[addr];
end

assign data_out = data_out_r;
`else
SP256K bb_spram_inst(.AD(addr), .DI(data_in), .MASKWE(we), .WE(|we), .CS('1), .CK(clk), .STDBY('0), .SLEEP('0), .PWROFF_N('1), .DO(data_out));
`endif

endmodule