Creating HDL Text Modules, страница 73

•  Define two asynchronous resets on state NOPE

                                                           G.15 State Diagram

Now you will define the action for the NOPE state

•  Press the State Action       icon on the toolbar

•  Click on the NOPE state

•  Define Action:                      red <= ‘0’;

                                                                                   yellow <= ‘0’;

                                                                                   green <= ‘0’;

                                                                 G.16 State Diagram

Now you will set LIGHT state as hierarchical

•  Right click on the LIGHT state

•  Select the Properties option

•  Check the Hierarchical check-box

•  Press the OK button

 

                                                     G.17 State Diagram

Now you will define the contents of hierarchical state

LIGHT 

•  Select LIGHT state

•  Press the Push Hierarchy       icon on the toolbar.
Window with the new state diagram sheet will appear

                                                    G.18 State Diagram

•  To pop up hierarchy level you can use      icon

•  The       symbol defines entry point

•  The      symbol defines exit point

You can define multiple entry points and more than one exit point as well.

                                                     G.19 State Diagram

•  Draw this state diagram for the LIGHT  sub-state :

•    You can resize states if the name doesn’t fit

                                                               G.19a State Diagram

You can change some part of state diagram into hierarchical state:

•  select part of the diagram

•  Click “Converts to hierarchical state”

 

                                                                  G.20 State Diagram

When the diagram is finished,

you can run simulation.

•  Run lights_TB_runtest.do macro

                                                        G.21 State Diagram

   You should receive results like this:

  

                                      Appendix H

                                      Junction & Auto Priority

                                                            H.1 State Diagram 
Junction & Auto Priority

•                                                  Create State Diagram

•  Add the generated file to the design

•  Choose VHDL as a generated language for the State Diagram

•  Type the name of the source file to create

               

                                                    H.2 State Diagram
Junction & Auto Priority

•  Add new ports to the State Diagram:

–  a: in STD_LOGIC;

–  b: in STD_LOGIC;

–  c: in STD_LOGIC;

–  clk: in STD_LOGIC;   // as a clock

–  d: in STD_LOGIC;

–  RESET1: in STD_LOGIC;

–  RESET2: in STD_LOGIC;

–  state: out STD_LOGIC_VECTOR (3 downto 0)

•  Add new ports to the State Diagram:

–  a: in STD_LOGIC;

–  b: in STD_LOGIC;

–  c: in STD_LOGIC;

–  clk: in STD_LOGIC;   // as a clock

–  d: in STD_LOGIC;

–  RESET1: in STD_LOGIC;

–  RESET2: in STD_LOGIC;

–  state: out STD_LOGIC_VECTOR (3 downto 0)

H.3 State Diagram
Junction & Auto Priority

•  Place 7 states on diagram

•  Now, we are going to define transitions similar to the ones presented on the picture below, but not in this way…

•  We are going to use         “Junction”

H.4 State Diagram
Junction & Auto Priority

•  Place “Junction”  on the diagram

•  Place following “Transitions” between states

•  Place “Junction”  on the diagram

•  Place following “Transitions” between states

H.5 State Diagram
Junction & Auto Priority

•  Add two synchronous Resets to State Diagram - use  “Add Reset” button in “Machine Properties”