Add reset debounce

4 files changed, 42 insertions, 6 deletions

diff --git a/conspiracion.qsf b/conspiracion.qsf
index 383d264..2eaa3d4 100644
--- a/conspiracion.qsf
+++ b/conspiracion.qsf
@@ -108,8 +108,7 @@ set_global_assignment -name ECO_REGENERATE_REPORT ON
 
 
 set_location_assignment PIN_AF14 -to clk_clk
-
-set_location_assignment PIN_AB12 -to reset_reset_n
+set_location_assignment PIN_AB12 -to rst_n
 
 set_location_assignment PIN_V16 -to pio_leds[0]
 set_location_assignment PIN_W16 -to pio_leds[1]
@@ -345,4 +344,5 @@ set_global_assignment -name SIP_FILE ip/dsp_mul.sip
 
 
 
+
 set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top
\ No newline at end of file
diff --git a/rtl/debounce.sv b/rtl/debounce.sv
new file mode 100644
index 0000000..dff9e9e
--- /dev/null
+++ b/rtl/debounce.sv
@@ -0,0 +1,25 @@
+module debounce
+(
+	input  logic clk,
+	             dirty,
+	output logic clean
+);
+
+	logic last;
+	logic[15:0] clean_for;
+
+	always @(posedge clk) begin
+		last <= dirty;
+		clean_for <= last == dirty ? clean_for + 1 : 0;
+
+		if(&clean_for)
+			clean <= last;
+	end
+
+	initial begin
+		last = 0;
+		clean = 0;
+		clean_for = 0;
+	end
+
+endmodule
diff --git a/rtl/top/conspiracion.sv b/rtl/top/conspiracion.sv
index 4409d9b..8b29699 100644
--- a/rtl/top/conspiracion.sv
+++ b/rtl/top/conspiracion.sv
@@ -1,7 +1,7 @@
 module conspiracion
 (
 	input  wire        clk_clk,
-	input  wire        reset_reset_n,
+	input  wire        rst_n,
 	output wire [12:0] memory_mem_a,
 	output wire [2:0]  memory_mem_ba,
 	output wire        memory_mem_ck,
@@ -41,7 +41,18 @@ module conspiracion
 
 	logic[29:0] addr;
 	logic[31:0] data_rd, data_wr;
-	logic cpu_clk, ready, write, start, irq;
+	logic reset_reset_n, cpu_clk, ready, write, start, irq;
+
+`ifdef VERILATOR
+	assign reset_reset_n = rst_n;
+`else
+	debounce reset_debounce
+	(
+		.clk(clk_clk),
+		.dirty(rst_n),
+		.clean(reset_reset_n)
+	);
+`endif
 
 	arm810 core
 	(
diff --git a/tb/top/conspiracion.cpp b/tb/top/conspiracion.cpp
index b73bd4b..6af5d0b 100644
--- a/tb/top/conspiracion.cpp
+++ b/tb/top/conspiracion.cpp
@@ -230,9 +230,9 @@ int main(int argc, char **argv)
 		tick();
 	};
 
-	top.reset_reset_n = 0;
+	top.rst_n = 0;
 	cycle();
-	top.reset_reset_n = 1;
+	top.rst_n = 1;
 
 	for(unsigned i = 0; i < *cycles; ++i)
 	{