added documentation examples in markdown

6 files changed, 1440 insertions, 240 deletions

diff --git a/doc/images/Duty_Cycle_Examples.png b/doc/images/Duty_Cycle_Examples.png
new file mode 100644
index 0000000..5c516e1
--- /dev/null
+++ b/doc/images/Duty_Cycle_Examples.png
diff --git a/doc/images/de1_pwm_schematic.svg b/doc/images/de1_pwm_schematic.svg
new file mode 100644
index 0000000..db5d876
--- /dev/null
+++ b/doc/images/de1_pwm_schematic.svg
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+     <text class="TextShape"><tspan class="TextParagraph" font-family="Liberation Sans, sans-serif" font-size="318px" font-weight="400"><tspan class="TextPosition" x="20051" y="8585"><tspan fill="rgb(0,0,0)" stroke="none">rst_ni</tspan></tspan></tspan></text>
+    </g>
+   </g>
+   <g class="com.sun.star.drawing.TextShape">
+    <g id="id34">
+     <rect class="BoundingBox" stroke="none" fill="none" x="18601" y="6171" width="2345" height="608"/>
+     <text class="TextShape"><tspan class="TextParagraph" font-family="Liberation Sans, sans-serif" font-size="318px" font-weight="400"><tspan class="TextPosition" x="18852" y="6584"><tspan fill="rgb(0,0,0)" stroke="none">pwm_width_i</tspan></tspan></tspan></text>
+    </g>
+   </g>
+   <g class="com.sun.star.drawing.TextShape">
+    <g id="id35">
+     <rect class="BoundingBox" stroke="none" fill="none" x="33487" y="5697" width="1527" height="608"/>
+     <text class="TextShape"><tspan class="TextParagraph" font-family="Liberation Sans, sans-serif" font-size="318px" font-weight="400"><tspan class="TextPosition" x="33737" y="6110"><tspan fill="rgb(0,0,0)" stroke="none">pwm_o</tspan></tspan></tspan></text>
+    </g>
+   </g>
+   <g class="com.sun.star.drawing.TextShape">
+    <g id="id36">
+     <rect class="BoundingBox" stroke="none" fill="none" x="23331" y="2070" width="1925" height="531"/>
+     <text class="TextShape"><tspan class="TextParagraph" font-family="Liberation Sans, sans-serif" font-size="247px" font-weight="400"><tspan class="TextPosition" x="23581" y="2419"><tspan fill="rgb(0,0,0)" stroke="none">current_state</tspan></tspan></tspan></text>
+    </g>
+   </g>
+   <g class="com.sun.star.drawing.TextShape">
+    <g id="id37">
+     <rect class="BoundingBox" stroke="none" fill="none" x="23600" y="3970" width="1629" height="531"/>
+     <text class="TextShape"><tspan class="TextParagraph" font-family="Liberation Sans, sans-serif" font-size="247px" font-weight="400"><tspan class="TextPosition" x="23850" y="4319"><tspan fill="rgb(0,0,0)" stroke="none">next_state</tspan></tspan></tspan></text>
+    </g>
+   </g>
+   <g class="com.sun.star.drawing.TextShape">
+    <g id="id38">
+     <rect class="BoundingBox" stroke="none" fill="none" x="29800" y="5500" width="1439" height="531"/>
+     <text class="TextShape"><tspan class="TextParagraph" font-family="Liberation Sans, sans-serif" font-size="247px" font-weight="400"><tspan class="TextPosition" x="30050" y="5849"><tspan fill="rgb(0,0,0)" stroke="none">buf_next</tspan></tspan></tspan></text>
+    </g>
+   </g>
+   <g class="com.sun.star.drawing.RectangleShape">
+    <g id="id39">
+     <rect class="BoundingBox" stroke="none" fill="none" x="18590" y="1990" width="16421" height="7021"/>
+     <path fill="none" stroke="rgb(255,255,255)" stroke-width="20" stroke-linejoin="round" d="M 26800,9000 L 18600,9000 18600,2000 35000,2000 35000,9000 26800,9000 Z"/>
+    </g>
+   </g>
+  </g>
+ </g>
+</svg>
\ No newline at end of file
diff --git a/doc/pulse_width_modulator_datasheet.md b/doc/pulse_width_modulator_datasheet.md
index 2f1caa4..5aa4784 100644
--- a/doc/pulse_width_modulator_datasheet.md
+++ b/doc/pulse_width_modulator_datasheet.md
@@ -1,45 +1,38 @@
 Introduction
 ============
 
-A heartbeat generator can be used in a digital system to ...
+Pulse width modulation (PWM) is a technique to generate periodic waveforms with adjustable duty cycles. PWM is used in many application areas like communications, power control, measurement, AD/DA-conversion, etc. [[1]](https://en.wikipedia.org/wiki/Pulse-width_modulation)
+
 
 Features
 ========
 
-Normal rhythm produces four entities – a P wave, a QRS complex, a T wave, and a U wave – that each
-have a fairly unique pattern. [[1]](https://en.wikipedia.org/wiki/Electrocardiography)
-
-For simplicity the existing heartbeat module generates the QRS complex and T wave only. 
-
-  * Models QRS-Complex and T-Wave
-  * Average time values based on 72 bpm
-  * Enable input for external prescaler
+  * default 8-bit resolution
+  * 8-bit control word input
+  * Enable input for external prescaler to control PWM period
 
 
 General Description
 ===================
 
-![Heartbeat Generator - Schematic Symbol](images/heartbeat_gen.png){width=40%}
+![Pulse Width Modulator - Schematic Symbol](images/pwm.svg){width=40%}
 
-| **Name**    | **Type**          | **Direction** | **Polarity** | **Description** |
-|-------------|-------------------|:-------------:|:------------:|-----------------|
-| clk_i       | std_ulogic        | IN            | HIGH         | clock           |
+| **Name**    | **Type**             | **Direction** | **Polarity** | **Description** |
+|-------------|----------------------|:-------------:|:------------:|-----------------|
+| clk_i       | std_ulogic           | IN            | HIGH         |                 |
+| rst_ni      | std_ulogic           | IN            | LOW          |                 |
+| en_pi       | std_ulogic           | IN            | HIGH         |                 |
+| pwm_width_i | std_ulogic_vector[8] | IN            | HIGH         | 8-bit control input word |
+| pwm_o       | std_ulogic           | OUT           | HIGH         |                 |
 
-: Heartbeat Generator - Description of I/O Signals
+: Pulse Width Modulator - Description of I/O Signals
 
 
 Functional Description
 ======================
 
-The shape of an [electrogardiogramm](https://en.wikipedia.org/wiki/Electrocardiography) as a voltage graph over time
-
-
 
-![Electrocardiogram](images/ECG-SinusRhythmLabel.png){width=20%}
-
-The important QRS complex and T wave are modelled as digital pulses.
-
-![QRS Complex and T Wave Pulses](images/qrs-complex-t-wave-pulses.pdf){width=80%}
+A mod-256 counter ...
 
 
 Design Description
@@ -47,27 +40,27 @@ Design Description
 
 A conceptional RTL diagram is shown below.
 
-![Heartbeat Generator - Conceptional RTL](images/heartbeat_gen_conceptional_rtl.pdf){width=60%}
+![Pulse Width Modulator - Conceptional RTL](images/pwm_conceptional_rtl.svg){width=60%}
 
-The simulation result shows two full periods based on a clock period of 1 ms
+The simulation result shows the corner cases minimum, maximum, switched off, and a cuty cycle of 50 %.
 
-![Two Periods - Simulation Result](images/heartbeat_gen_two_periods_simwave.png){width=80%}
+![Pulse Width Modulator - Simulation Result](images/pwm_simwave.png){width=80%}
 
-In more detail using cursors to display correct parameters of the QRS complex and T wave.
+In more detail using cursors to display a PWM frequency of f~PWM~=21.7kHz
 
-![QRS-Complex and T-Wave - Simulation Result](images/qrs-complex-t-wave_simwave.png){width=80%}
+![Pulse Width Modulator - 21.7 kHz - Simulation Result](images/pwm_21.7kHz_simwave.png){width=80%}
 
 
 
 Device Utilization and Performance
 ==================================
 
-The following table shows the utilisation of both modules heartbeat_gen and cntdnmodm.
+The following table shows the utilisation of both modules pwm and cntdnmodm.
 
 The following results  are extracted from
 
   ```pure
-  pnr/de1_heartbeat_gen/de1_heartbeat_gen.fit.rpt
+  pnr/de1_pwm/de1_pwm.fit.rpt
   ```
 
 
@@ -80,7 +73,7 @@ The following results  are extracted from
 The following results  are extracted from
 
   ```pure
-de1_heartbeat_gen.sta.rpt
+de1_pwm.sta.rpt
 ```
 
 ```pure
@@ -103,9 +96,9 @@ Application Note
 ================
 
 The following test environment on a DE1 prototype board uses a system clock frequency of 50 MHz.
-A prescaler is parameterised to generate an output signal with a period of 1 ms.
+A prescaler is parameterised to generate an output signal with a period of 46.08 us.
 
-![Test Environment on DE1 Prototype Board](images/de1_heartbeat_gen_schematic.pdf){width=70%}
+![Test Environment on DE1 Prototype Board](images/de1_pwm_schematic.svg){width=70%}
 
 
 
@@ -115,7 +108,7 @@ Appendix
 References
 ----------
 
-* [Wiki: Electrocardiography](https://en.wikipedia.org/wiki/Electrocardiography)
+* [Wiki: Pulse Width Modulation](https://en.wikipedia.org/wiki/Pulse-width_modulation)
 
 Project Hierarchy
 -----------------
@@ -123,15 +116,15 @@ Project Hierarchy
 ### Module Hierarchy for Verification
 
 ```pure
-t_heartbeat_gen(tbench)
-  heartbeat_gen(rtl)
+t_pwm(tbench)
+  pwm(rtl)
 ```
 
 ### Prototype Environment
 
 ```pure
-de1_heartbeat_gen(structure)
-  heartbeat_gen(rtl)
+de1_pwm(structure)
+  pwm(rtl)
   cntdnmodm(rtl)
 ```
 
@@ -139,60 +132,39 @@ VHDL Sources
 ------------
 
 ```vhdl
-LIBRARY IEEE;
-USE IEEE.std_logic_1164.ALL;
-
-ENTITY heartbeat_gen IS
-  PORT (clk_i   : IN  std_ulogic;
-        rst_ni  : IN  std_ulogic;
-        en_pi   : IN  std_ulogic;
-        count_o : OUT std_ulogic_vector;
-        heartbeat_o : OUT std_ulogic
-        );
-END heartbeat_gen;
-```
-
-```vhdl
-LIBRARY IEEE;
+LIBRARY ieee;
 USE IEEE.std_logic_1164.ALL;
 USE IEEE.numeric_std.ALL;
 
-ARCHITECTURE rtl OF heartbeat_gen IS
+ENTITY pwm IS
 
-  CONSTANT n    : natural                := 10;
-  CONSTANT zero : unsigned(n-1 DOWNTO 0) := (OTHERS => '0');
+  PORT(
+    clk_i       : IN  std_ulogic;                     -- clock input
+    rst_ni      : IN  std_ulogic;                     -- reset L-active
+    en_pi       : IN  std_ulogic;                     -- enable H-active
+    pwm_width_i : IN  std_ulogic_vector(7 DOWNTO 0);  -- width of pulse
+    pwm_o       : OUT std_ulogic);                    -- pwm output
 
-  CONSTANT heartbeat_period : unsigned(n-1 DOWNTO 0) := to_unsigned(833, n);
-  CONSTANT qrs_width        : unsigned(n-1 DOWNTO 0) := to_unsigned(100, n);
-  CONSTANT st_width
-  CONSTANT t_width
-  CONSTANT qt_width
+END pwm;
 
-  SIGNAL next_state, current_state : unsigned(n-1 DOWNTO 0);
+ARCHITECTURE rtl OF pwm IS
 
-  SIGNAL tc_qrs                    : std_ulogic;  -- qrs interval
-  SIGNAL tc_t                      : std_ulogic;  -- T wave
-
-BEGIN
+  SIGNAL next_state, current_state : unsigned(7 DOWNTO 0);  -- states
 
-  next_state_logic : 
-                     
+  SIGNAL buf_next : std_ulogic;  -- output buffer
 
+BEGIN
 
-  state_register : 
-                   
-
-  -- output_logic
-  t_wave : tc_t <= 
-                   
-                   
-                   
-  qrs_complex : tc_qrs <= 
-                          
-
-  output_value : heartbeat_o <= 
-
+  next_state_logic : next_state <= 
+  
+  state_register : current_state <= (OTHERS => '0') WHEN rst_ni = '0' ELSE
+                                    next_state WHEN rising_edge(clk_i) AND (en_pi = '1');
 
+  counter_output : buf_next <= 
+  
+  -- output buffer
+  output_register : pwm_o <= 
+  
 END rtl;
 ```
 
@@ -201,6 +173,6 @@ Revision History
 
 | **Date**  | **Version**  | **Change Summary**  |
 |:----------|:-------------|:--------------------|
-| May 2020  | 0.1  | Initial Release  |
-| April 2021  | 0.2  | Added parameterisation  |
+| May 2022  | 0.1  | Initial Release  |
+| April 2022  | 0.2  | Added VHDL code  |
 
diff --git a/doc/pulse_width_modulator_presentation.md b/doc/pulse_width_modulator_presentation.md
index d742c03..83cbaf7 100644
--- a/doc/pulse_width_modulator_presentation.md
+++ b/doc/pulse_width_modulator_presentation.md
@@ -1,8 +1,8 @@
 ---
-title: Heartbeat Generator
+title: Pulse Width Modulator
 subtitle: VLSI-Design Module - Presentation
 author: J Färber
-date: SS2021
+date: SS2022
 ---
 
 Overview
@@ -20,26 +20,25 @@ Overview
 Features
 ========
 
-  * Models QRS-Complex and T-Wave
-  * Average time values based on 72 bpm
-  * Enable input for external prescaler
-
+  * Default 8-bit resolution
+  * 8-bit control word input
+  * Enable input for external prescaler to control PWM period
+  
 Interface Signals
 =================
 
-![Heartbeat Generator - Schematic Symbol](images/heartbeat_gen_symbol.pdf){width=40%}
+![Pulse Width Modulator - Schematic Symbol](images/pwm.svg){width=40%}
 
 
 Functional Description
 ======================
 
-Simplification to Digital Pulses
+Duty Cycle
 ---------
 
-![Electrocardiogram](images/ECG-SinusRhythmLabel.png){width=20%}
-
+![Duty Cycle Examples](images/Duty_Cycle_Examples.png){width=60%}
 
-![QRS Complex and T Wave Pulses](images/qrs-complex-t-wave-pulses.pdf){width=80%}
+[Reference: Wikipedia - Pulse Width Modulation](https://en.wikipedia.org/wiki/Pulse-width_modulation)
 
 
 Functional Description
@@ -48,37 +47,37 @@ Functional Description
 Conceptional RTL Diagram
 ---------------
 
-![Heartbeat Generator - Conceptional RTL](images/heartbeat_gen_conceptional_rtl.pdf){width=60%}
+![Pulse Width Modulator - Conceptional RTL](images/pwm_conceptional_rtl.svg){width=60%}
 
 Simulation Result - Top Level
 =============================
 
-![Two Periods - Simulation Result](images/heartbeat_gen_two_periods_simwave.png){width=80%}
+![Pulse Width Modulator - Simulation Result](images/pwm_simwave.png){width=80%}
 
 Device Utilization and Performance
 ==================================
 
 ```pure
-+------------------------------------------------------------------------------+
-; Fitter Summary                                                               ;
-+------------------------------------+-----------------------------------------+
-; Fitter Status                      ; Successful - Wed Mar 31 11:50:15 2021   ;
-; Quartus II 32-bit Version          ; 13.0.1 Build 232 06/12/2013 SP 1 SJ Web ;
-; Revision Name                      ; de1_heartbeat_gen                       ;
-; Top-level Entity Name              ; de1_heartbeat_gen                       ;
-; Family                             ; Cyclone II                              ;
-; Device                             ; EP2C20F484C7                            ;
-; Timing Models                      ; Final                                   ;
-; Total logic elements               ; 50 / 18,752 ( < 1 % )                   ;
-;     Total combinational functions  ; 50 / 18,752 ( < 1 % )                   ;
-;     Dedicated logic registers      ; 26 / 18,752 ( < 1 % )                   ;
-; Total registers                    ; 26                                      ;
-; Total pins                         ; 15 / 315 ( 5 % )                        ;
-; Total virtual pins                 ; 0                                       ;
-; Total memory bits                  ; 0 / 239,616 ( 0 % )                     ;
-; Embedded Multiplier 9-bit elements ; 0 / 52 ( 0 % )                          ;
-; Total PLLs                         ; 0 / 4 ( 0 % )                           ;
-+------------------------------------+-----------------------------------------+
++-----------------------------------------------------------------------------+
+; Fitter Summary                                                              ;
++------------------------------------+----------------------------------------+
+; Fitter Status                      ; Successful - Fri Mar 11 10:39:29 2022  ;
+; Quartus II 32-bit Version          ; 13.0.1 Build 232 06/12/2013 SP 1 SJ Web;
+; Revision Name                      ; de1_pwm                                ;
+; Top-level Entity Name              ; de1_pwm                                ;
+; Family                             ; Cyclone II                             ;
+; Device                             ; EP2C20F484C7                           ;
+; Timing Models                      ; Final                                  ;
+; Total logic elements               ; 38 / 18,752 ( < 1 % )                  ;
+;     Total combinational functions  ; 38 / 18,752 ( < 1 % )                  ;
+;     Dedicated logic registers      ; 21 / 18,752 ( < 1 % )                  ;
+; Total registers                    ; 21                                     ;
+; Total pins                         ; 22 / 315 ( 7 % )                       ;
+; Total virtual pins                 ; 0                                      ;
+; Total memory bits                  ; 0 / 239,616 ( 0 % )                    ;
+; Embedded Multiplier 9-bit elements ; 0 / 52 ( 0 % )                         ;
+; Total PLLs                         ; 0 / 4 ( 0 % )                          ;
++------------------------------------+----------------------------------------+
 ```
 
 Demonstration
@@ -87,7 +86,7 @@ Demonstration
 Prototype Setup
 ---------------
 
-![Test Environment on DE1 Prototype Board](images/de1_heartbeat_gen_schematic.pdf){width=70%}
+![Test Environment on DE1 Prototype Board](images/de1_pwm_schematic.svg){width=70%}
 
 Demonstration
 =============
@@ -95,7 +94,8 @@ Demonstration
 Test Environment
 ----------------
 
-
+Measurement Result
+-----------
 
 
 
diff --git a/doc/pulse_width_modulator_report.md b/doc/pulse_width_modulator_report.md
index 67cb4c2..5aa4784 100644
--- a/doc/pulse_width_modulator_report.md
+++ b/doc/pulse_width_modulator_report.md
@@ -1,51 +1,38 @@
 Introduction
 ============
 
-A heartbeat generator can be used in a digital system to display activity of a system.
-Based on population studies, a heartrate between 60 and 100 beats per minute (bpm)
-is considered as normal for a human adult.
+Pulse width modulation (PWM) is a technique to generate periodic waveforms with adjustable duty cycles. PWM is used in many application areas like communications, power control, measurement, AD/DA-conversion, etc. [[1]](https://en.wikipedia.org/wiki/Pulse-width_modulation)
+
 
 Features
 ========
 
-Normal rhythm produces four entities – a P wave, a QRS complex, a T wave, and a U wave – that each
-have a fairly unique pattern. [[1]](https://en.wikipedia.org/wiki/Electrocardiography)
-
-For simplicity the existing heartbeat modules generates the QRS complex and T wave only. 
-
-  * Models QRS-Complex and T-Wave
-  * Average time values based on 72 bpm
-  * Enable input for external prescaler
+  * default 8-bit resolution
+  * 8-bit control word input
+  * Enable input for external prescaler to control PWM period
 
 
 General Description
 ===================
 
-![Heartbeat Generator - Schematic Symbol](images/heartbeat_gen_symbol.pdf){width=40%}
+![Pulse Width Modulator - Schematic Symbol](images/pwm.svg){width=40%}
 
-| **Name**    | **Type**          | **Direction** | **Polarity** | **Description** |
-|-------------|-------------------|:-------------:|:------------:|-----------------|
-| clk_i       | std_ulogic        | IN            | HIGH         | clock           |
-| rst_ni      | std_ulogic        | IN            | LOW          | reset           |
-| en_pi       | std_ulogic        | IN            | HIGH         | enable          |
-| count_o     | std_ulogic_vector | OUT           | HIGH         | count value     |
-| heartbeat_o | std_ulogic        | OUT           | HIGH         | hearbeat pulse output |
+| **Name**    | **Type**             | **Direction** | **Polarity** | **Description** |
+|-------------|----------------------|:-------------:|:------------:|-----------------|
+| clk_i       | std_ulogic           | IN            | HIGH         |                 |
+| rst_ni      | std_ulogic           | IN            | LOW          |                 |
+| en_pi       | std_ulogic           | IN            | HIGH         |                 |
+| pwm_width_i | std_ulogic_vector[8] | IN            | HIGH         | 8-bit control input word |
+| pwm_o       | std_ulogic           | OUT           | HIGH         |                 |
 
-: Heartbeat Generator - Description of I/O Signals
+: Pulse Width Modulator - Description of I/O Signals
 
 
 Functional Description
 ======================
 
-The shape of an [electrogardiogramm](https://en.wikipedia.org/wiki/Electrocardiography) as a voltage graph over time
-
 
-
-![Electrocardiogram](images/ECG-SinusRhythmLabel.png){width=20%}
-
-The important QRS complex and T wave are modelled as digital pulses.
-
-![QRS Complex and T Wave Pulses](images/qrs-complex-t-wave-pulses.pdf){width=80%}
+A mod-256 counter ...
 
 
 Design Description
@@ -53,88 +40,65 @@ Design Description
 
 A conceptional RTL diagram is shown below.
 
-![Heartbeat Generator - Conceptional RTL](images/heartbeat_gen_conceptional_rtl.pdf){width=60%}
+![Pulse Width Modulator - Conceptional RTL](images/pwm_conceptional_rtl.svg){width=60%}
 
-The simulation result shows two full periods based on a clock period of 1 ms
+The simulation result shows the corner cases minimum, maximum, switched off, and a cuty cycle of 50 %.
 
-![Two Periods - Simulation Result](images/heartbeat_gen_two_periods_simwave.png){width=80%}
+![Pulse Width Modulator - Simulation Result](images/pwm_simwave.png){width=80%}
 
-In more detail using cursors to display correct parameters of the QRS complex and T wave.
+In more detail using cursors to display a PWM frequency of f~PWM~=21.7kHz
 
-![QRS-Complex and T-Wave - Simulation Result](images/qrs-complex-t-wave_simwave.png){width=80%}
+![Pulse Width Modulator - 21.7 kHz - Simulation Result](images/pwm_21.7kHz_simwave.png){width=80%}
 
 
 
 Device Utilization and Performance
 ==================================
 
-The following table shows the utilisation of both modules heartbeat_gen and cntdnmodm.
+The following table shows the utilisation of both modules pwm and cntdnmodm.
+
+The following results  are extracted from
+
+  ```pure
+  pnr/de1_pwm/de1_pwm.fit.rpt
+  ```
+
 
 ```pure
 +--------------------------------------------------------------------------------------+
 ; Fitter Summary                                                                       ;
 +------------------------------------+-------------------------------------------------+
-; Fitter Status                      ; Successful - Wed Mar 31 11:50:15 2021           ;
-; Quartus II 32-bit Version          ; 13.0.1 Build 232 06/12/2013 SP 1 SJ Web Edition ;
-; Revision Name                      ; de1_heartbeat_gen                               ;
-; Top-level Entity Name              ; de1_heartbeat_gen                               ;
-; Family                             ; Cyclone II                                      ;
-; Device                             ; EP2C20F484C7                                    ;
-; Timing Models                      ; Final                                           ;
-; Total logic elements               ; 50 / 18,752 ( < 1 % )                           ;
-;     Total combinational functions  ; 50 / 18,752 ( < 1 % )                           ;
-;     Dedicated logic registers      ; 26 / 18,752 ( < 1 % )                           ;
-; Total registers                    ; 26                                              ;
-; Total pins                         ; 15 / 315 ( 5 % )                                ;
-; Total virtual pins                 ; 0                                               ;
-; Total memory bits                  ; 0 / 239,616 ( 0 % )                             ;
-; Embedded Multiplier 9-bit elements ; 0 / 52 ( 0 % )                                  ;
-; Total PLLs                         ; 0 / 4 ( 0 % )                                   ;
-+------------------------------------+-------------------------------------------------+
 ```
 
-```pure
+The following results  are extracted from
 
+  ```pure
+de1_pwm.sta.rpt
+```
+
+```pure
 +----------------------------------------------------------------------------------------+
 ; TimeQuest Timing Analyzer Summary                                                      ;
 +--------------------+-------------------------------------------------------------------+
-; Quartus II Version ; Version 13.0.1 Build 232 06/12/2013 Service Pack 1 SJ Web Edition ;
-; Revision Name      ; de1_heartbeat_gen                                                 ;
-; Device Family      ; Cyclone II                                                        ;
-; Device Name        ; EP2C20F484C7                                                      ;
-; Timing Models      ; Final                                                             ;
-; Delay Model        ; Combined                                                          ;
-; Rise/Fall Delays   ; Unavailable                                                       ;
-+--------------------+-------------------------------------------------------------------+
 
 -----------------------------------------+
 ; Clocks                                 ; 
 +------------+------+--------+-----------+
-; Clock Name ; Type ; Period ; Frequency ;
-+------------+------+--------+-----------+
-; CLOCK_50	 ; Base ; 20.000 ; 50.0 MHz	 ;
-+------------+------+--------+-----------+
 
 
 +-----------------------------------------------------------------------------+
 ; Multicorner Timing Analysis Summary                                         ;
 +------------------+-------+-------+----------+---------+---------------------+
-; Clock            ; Setup ; Hold  ; Recovery ; Removal ; Minimum Pulse Width ;
-+------------------+-------+-------+----------+---------+---------------------+
-; Worst-case Slack ; 3.390 ; 0.241 ; 13.381   ; 3.796   ; 8.889               ;
-;  CLOCK_50        ; 3.390 ; 0.241 ; 13.381   ; 3.796   ; 8.889               ;
-; Design-wide TNS  ; 0.0   ; 0.0   ; 0.0      ; 0.0     ; 0.0                 ;
-;  CLOCK_50        ; 0.000 ; 0.000 ; 0.000    ; 0.000   ; 0.000               ;
-+------------------+-------+-------+----------+---------+---------------------+
+
 ```
 
 Application Note
 ================
 
 The following test environment on a DE1 prototype board uses a system clock frequency of 50 MHz.
-A prescaler is parameterised to generate an output signal with a period of 1 ms.
+A prescaler is parameterised to generate an output signal with a period of 46.08 us.
 
-![Test Environment on DE1 Prototype Board](images/de1_heartbeat_gen_schematic.pdf){width=70%}
+![Test Environment on DE1 Prototype Board](images/de1_pwm_schematic.svg){width=70%}
 
 
 
@@ -144,7 +108,7 @@ Appendix
 References
 ----------
 
-* [Wiki: Electrocardiography](https://en.wikipedia.org/wiki/Electrocardiography)
+* [Wiki: Pulse Width Modulation](https://en.wikipedia.org/wiki/Pulse-width_modulation)
 
 Project Hierarchy
 -----------------
@@ -152,15 +116,15 @@ Project Hierarchy
 ### Module Hierarchy for Verification
 
 ```pure
-t_heartbeat_gen(tbench)
-  heartbeat_gen(rtl)
+t_pwm(tbench)
+  pwm(rtl)
 ```
 
 ### Prototype Environment
 
 ```pure
-de1_heartbeat_gen(structure)
-  heartbeat_gen(rtl)
+de1_pwm(structure)
+  pwm(rtl)
   cntdnmodm(rtl)
 ```
 
@@ -168,60 +132,39 @@ VHDL Sources
 ------------
 
 ```vhdl
-LIBRARY IEEE;
-USE IEEE.std_logic_1164.ALL;
-
-ENTITY heartbeat_gen IS
-  PORT (clk_i   : IN  std_ulogic;
-        rst_ni  : IN  std_ulogic;
-        en_pi   : IN  std_ulogic;
-        count_o : OUT std_ulogic_vector;
-        heartbeat_o : OUT std_ulogic
-        );
-END heartbeat_gen;
-```
-
-```vhdl
-LIBRARY IEEE;
+LIBRARY ieee;
 USE IEEE.std_logic_1164.ALL;
 USE IEEE.numeric_std.ALL;
 
-ARCHITECTURE rtl OF heartbeat_gen IS
-
-  CONSTANT n    : natural                := 10;
-  CONSTANT zero : unsigned(n-1 DOWNTO 0) := (OTHERS => '0');
-
-  CONSTANT heartbeat_period : unsigned(n-1 DOWNTO 0) := to_unsigned(833, n);
-  CONSTANT qrs_width        : unsigned(n-1 DOWNTO 0) := to_unsigned(100, n);
-  CONSTANT st_width
-  CONSTANT t_width
-  CONSTANT qt_width
+ENTITY pwm IS
 
-  SIGNAL next_state, current_state : unsigned(n-1 DOWNTO 0);
+  PORT(
+    clk_i       : IN  std_ulogic;                     -- clock input
+    rst_ni      : IN  std_ulogic;                     -- reset L-active
+    en_pi       : IN  std_ulogic;                     -- enable H-active
+    pwm_width_i : IN  std_ulogic_vector(7 DOWNTO 0);  -- width of pulse
+    pwm_o       : OUT std_ulogic);                    -- pwm output
 
-  SIGNAL tc_qrs                    : std_ulogic;  -- qrs interval
-  SIGNAL tc_t                      : std_ulogic;  -- T wave
+END pwm;
 
-BEGIN
-
-  next_state_logic : 
-                     
+ARCHITECTURE rtl OF pwm IS
 
+  SIGNAL next_state, current_state : unsigned(7 DOWNTO 0);  -- states
 
-  state_register : 
-                   
+  SIGNAL buf_next : std_ulogic;  -- output buffer
 
-  -- output_logic
-  t_wave : tc_t <= 
-                   
-                   
-                   
-  qrs_complex : tc_qrs <= 
-                          
-
-  output_value : heartbeat_o <= 
+BEGIN
 
+  next_state_logic : next_state <= 
+  
+  state_register : current_state <= (OTHERS => '0') WHEN rst_ni = '0' ELSE
+                                    next_state WHEN rising_edge(clk_i) AND (en_pi = '1');
 
+  counter_output : buf_next <= 
+  
+  -- output buffer
+  output_register : pwm_o <= 
+  
 END rtl;
 ```
 
@@ -230,6 +173,6 @@ Revision History
 
 | **Date**  | **Version**  | **Change Summary**  |
 |:----------|:-------------|:--------------------|
-| May 2020  | 0.1  | Initial Release  |
-| April 2021  | 0.2  | Added parameterisation  |
+| May 2022  | 0.1  | Initial Release  |
+| April 2022  | 0.2  | Added VHDL code  |