picorv32/dhrystone/testbench.v

105 lines
2.3 KiB
Verilog

`timescale 1 ns / 1 ps
module testbench;
reg clk = 1;
reg resetn = 0;
wire trap;
always #5 clk = ~clk;
initial begin
repeat (100) @(posedge clk);
resetn <= 1;
end
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 #(
.BARREL_SHIFTER(1),
.ENABLE_MUL(1),
.ENABLE_DIV(1),
.PROGADDR_RESET('h10000),
.STACKADDR('h10000)
) 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 [7:0] memory [0:256*1024-1];
initial $readmemh("dhry.hex", memory);
assign mem_ready = 1;
always @(posedge clk) begin
mem_rdata[ 7: 0] <= mem_la_read ? memory[mem_la_addr + 0] : 'bx;
mem_rdata[15: 8] <= mem_la_read ? memory[mem_la_addr + 1] : 'bx;
mem_rdata[23:16] <= mem_la_read ? memory[mem_la_addr + 2] : 'bx;
mem_rdata[31:24] <= mem_la_read ? memory[mem_la_addr + 3] : 'bx;
if (mem_la_write) begin
case (mem_la_addr)
32'h1000_0000: begin
`ifndef TIMING
$write("%c", mem_la_wdata);
$fflush();
`endif
end
default: begin
if (mem_la_wstrb[0]) memory[mem_la_addr + 0] <= mem_la_wdata[ 7: 0];
if (mem_la_wstrb[1]) memory[mem_la_addr + 1] <= mem_la_wdata[15: 8];
if (mem_la_wstrb[2]) memory[mem_la_addr + 2] <= mem_la_wdata[23:16];
if (mem_la_wstrb[3]) memory[mem_la_addr + 3] <= mem_la_wdata[31:24];
end
endcase
end
end
initial begin
$dumpfile("testbench.vcd");
$dumpvars(0, testbench);
end
always @(posedge clk) begin
if (resetn && trap) begin
repeat (10) @(posedge clk);
$display("TRAP");
$finish;
end
end
`ifdef TIMING
initial begin
repeat (100000) @(posedge clk);
$finish;
end
always @(posedge clk) begin
if (uut.dbg_next)
$display("## %-s %d", uut.dbg_ascii_instr ? uut.dbg_ascii_instr : "pcpi", uut.count_cycle);
end
`endif
endmodule