Integrate Aznable codebase

rtl/generic_timer.v

@@ -0,0 +1,56 @@
+`timescale 1ns / 1ps
+/*============================================================================
+	Aznable (custom 8-bit computer system) - Generic timer
+
+	Author: Jim Gregory - https://github.com/JimmyStones/
+	Version: 1.0
+	Date: 2021-10-20
+
+	This program is free software; you can redistribute it and/or modify it
+	under the terms of the GNU General Public License as published by the Free
+	Software Foundation; either version 3 of the License, or (at your option)
+	any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License along
+	with this program. If not, see <http://www.gnu.org/licenses/>.
+===========================================================================*/
+
+module generic_timer #(
+	parameter COUNTER_WIDTH = 16,
+	parameter DIVIDER_WIDTH = 15,
+	parameter INTERVAL = 15'd24000
+)(
+	input   clk,
+	input   reset,
+    output reg [COUNTER_WIDTH-1:0]   counter
+);
+
+reg  [DIVIDER_WIDTH-1:0] divider = {DIVIDER_WIDTH{1'b0}};
+
+always @(posedge clk or posedge reset) 
+begin
+	if(reset)
+	begin
+		counter <= {COUNTER_WIDTH{1'b0}};
+		divider <= {DIVIDER_WIDTH{1'b0}};
+	end
+	else
+	begin
+		if(divider==INTERVAL)
+		begin
+			counter <= counter + 1'b1;
+			divider <= {DIVIDER_WIDTH{1'b0}};
+		end
+		else
+		begin
+			divider <= divider + 1'b1;
+	 	end
+	end
+end
+
+endmodule