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`timescale 1 ns / 1 ps
module top (
input clk,
input resetn,
output trap,
output reg [7:0] out_byte,
output reg out_byte_en
);
// 1024 32bit words = 4kB memory
parameter MEM_SIZE = 1024;
wire mem_valid;
wire mem_instr;
wire mem_ready;
wire [31:0] mem_addr;
wire [31:0] mem_wdata;
wire [3:0] mem_wstrb;
reg [31:0] mem_rdata;
wire mem_la_read;
wire mem_la_write;
wire [31:0] mem_la_addr;
wire [31:0] mem_la_wdata;
wire [3:0] mem_la_wstrb;
picorv32 #(
.ENABLE_COUNTERS(0),
.TWO_STAGE_SHIFT(0),
.CATCH_MISALIGN(0),
.CATCH_ILLINSN(0)
) uut (
.clk (clk ),
.resetn (resetn ),
.trap (trap ),
.mem_valid (mem_valid ),
.mem_instr (mem_instr ),
.mem_ready (mem_ready ),
.mem_addr (mem_addr ),
.mem_wdata (mem_wdata ),
.mem_wstrb (mem_wstrb ),
.mem_rdata (mem_rdata ),
.mem_la_read (mem_la_read ),
.mem_la_write(mem_la_write),
.mem_la_addr (mem_la_addr ),
.mem_la_wdata(mem_la_wdata),
.mem_la_wstrb(mem_la_wstrb)
);
reg [31:0] memory [0:MEM_SIZE-1];
initial $readmemh("firmware.hex", memory);
assign mem_ready = 1;
always @(posedge clk) begin
out_byte_en <= 0;
mem_rdata <= memory[mem_la_addr >> 2];
if (mem_la_write && (mem_la_addr >> 2) < MEM_SIZE) begin
if (mem_la_wstrb[0]) memory[mem_la_addr >> 2][ 7: 0] <= mem_la_wdata[ 7: 0];
if (mem_la_wstrb[1]) memory[mem_la_addr >> 2][15: 8] <= mem_la_wdata[15: 8];
if (mem_la_wstrb[2]) memory[mem_la_addr >> 2][23:16] <= mem_la_wdata[23:16];
if (mem_la_wstrb[3]) memory[mem_la_addr >> 2][31:24] <= mem_la_wdata[31:24];
end
else
if (mem_la_write && mem_la_addr == 32'h1000_0000) begin
out_byte_en <= 1;
out_byte <= mem_la_wdata;
end
end
endmodule
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