[main] added Cadence SYN and PaR scripts - initial version

[main] added Cadence SYN and PaR scripts - initial version

src/rtl/PWM.v

@@ -0,0 +1,46 @@
+`timescale 1ns / 1ps
+//////////////////////////////////////////////////////////////////////////////////
+// Company: 
+// Engineer: 
+// 
+// Create Date:    14:15:19 05/19/2018 
+// Design Name: 
+// Module Name:    PWM 
+// Project Name: 
+// Target Devices: 
+// Tool versions: 
+// Description: 
+//
+// Dependencies: 
+//
+// Revision: 
+// Revision 0.01 - File Created
+// Additional Comments: 
+//
+//////////////////////////////////////////////////////////////////////////////////
+module PWM(clk, reset, LED);
+	input clk, reset;
+	output LED;
+
+reg [26:0] cnt;
+reg [3:0] pwm_cnt;
+
+//Input counter
+always @(posedge clk)
+	if (reset)
+		cnt <= 27'd0;
+	else
+		cnt<=cnt+27'd1;
+
+wire [3:0] pwm_inp = cnt[26] ? ~cnt[25:22]: cnt[25:22];
+
+//PWM comparator
+always @(posedge clk)
+	if (reset)
+		pwm_cnt <= 4'd0;
+	else
+	    pwm_cnt <= pwm_cnt + 4'd1;
+		
+assign LED = (pwm_cnt<pwm_inp);
+
+endmodule

src/rtl/filelist.v

@@ -0,0 +1 @@
+`include "PWM.v"

src/sdc/PWM.sdc

@@ -0,0 +1,50 @@
+### Stage:				"Synthesis and PaR"
+### File description:			"Constraints for the design"
+
+
+# SET LIB UNITS
+set_units -time 1.0ns;
+set_units -capacitance 1.0pF;
+
+set_max_capacitance 0.5 [all_outputs]
+
+### ====================== CLOCKS ===========================
+# CLOCK and UNCERTAINTY
+set CLK_NAME   "clk";
+set CLK_PERIOD 40.0;
+set CLK_UNCERT 0.2;
+
+# CLK WAIVEFORM RISE-FALL TIMES
+set MINRISE 0.20
+set MAXRISE 0.25
+set MINFALL 0.20
+set MAXFALL 0.25
+
+# IO DELAYS
+set INPUT_DELAY_CLK       [expr $CLK_PERIOD/2.0]
+set OUTPUT_DELAY_CLK      [expr $CLK_PERIOD/2.0]
+
+
+
+create_clock -name $CLK_NAME -period $CLK_PERIOD -waveform "0 [expr $CLK_PERIOD/2]" [get_ports CLK_NAME]
+set_clock_uncertainty $CLK_UNCERT [get_clocks $CLK_NAME]
+
+set_clock_transition -rise -min $MINRISE [get_clocks $CLK_NAME]
+set_clock_transition -rise -max $MAXRISE [get_clocks $CLK_NAME]
+set_clock_transition -fall -min $MINFALL [get_clocks $CLK_NAME]
+set_clock_transition -fall -max $MAXFALL [get_clocks $CLK_NAME]
+
+
+
+#set_input_delay  -clock "clk" -max $INPUT_DELAY_CLK [all_inputs]
+#set_input_delay  -clock "clk" -min $INPUT_DELAY_CLK [all_inputs]
+
+set_output_delay -clock "clk" -max $OUTPUT_DELAY_CLK [all_outputs]
+set_output_delay -clock "clk" -min $OUTPUT_DELAY_CLK [all_outputs]
+
+
+
+### ====================== RESETS ===========================
+set RST_NAME "reset"
+set_ideal_network    [get_ports $RST_NAME]
+set_false_path -from [get_ports $RST_NAME]