add square signal

01-WaveformGenerator/WaveformGenerator/hdl/sawtoothgen_entity.vhg

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+-- VHDL Entity WaveformGenerator.sawtoothGen.symbol
+--
+-- Created:
+--          by - francois.francois (Aphelia)
+--          at - 08:02:49 03/11/19
+--
+-- Generated by Mentor Graphics' HDL Designer(TM) 2019.2 (Build 5)
+--
+LIBRARY ieee;
+  USE ieee.std_logic_1164.all;
+  USE ieee.numeric_std.all;
+
+ENTITY sawtoothGen IS
+    GENERIC( 
+        bitNb : positive := 16
+    );
+    PORT( 
+        sawtooth : OUT    unsigned (bitNb-1 DOWNTO 0);
+        clock    : IN     std_ulogic;
+        reset    : IN     std_ulogic;
+        step     : IN     unsigned (bitNb-1 DOWNTO 0);
+        en       : IN     std_ulogic
+    );
+
+-- Declarations
+
+END sawtoothGen ;
+