gateware

commit 6b430cd8294e52cd6ba8e997b9cad4ffc55da173
parent b8fbe188590994043da98f1228c8ddd735fd641c
Author: Brian Swetland <swetland@frotz.net>
Date:   Wed, 30 Dec 2015 18:43:29 -0800

debug nop support

Diffstat:
M
hdl/cpu/cpu.v
 | 
11
+++++++++++

1 file changed, 11 insertions(+), 0 deletions(-)
diff --git a/hdl/cpu/cpu.v b/hdl/cpu/cpu.v
@@ -8,6 +8,11 @@ module cpu #(
 	parameter SWIDTH = 4
 	)(
 	input clk,
+`ifdef WITH_DEBUG
+	output [RWIDTH-1:0]debug_data
+	output [3:0]debug_op,
+	output debug_wr,
+`endif
 	output [15:0]mem_raddr_o,
 	input [15:0]mem_rdata_i,
 	output [15:0]mem_waddr_o,
@@ -196,6 +201,12 @@ reg [1:0]using;
 wire conflict_a = (wsel == ir_asel) & using[1];
 wire conflict_b = (wsel == ir_bsel) & using[0];
 
+`ifdef WITH_DEBUG
+assign debug_op = ir_bsel;
+assign debug_data = regs_adata;
+assign debug_wr = do_fetch & ir_valid & (ir[15:12] == 4'b0010) & (ir[3:0] == 4'b1110);
+`endif
+
 always @(*) begin
 	// decode stage
 	do_fetch =       1'b1;