DO-CPLD-DK-G Xilinx Inc, DO-CPLD-DK-G Datasheet - Page 73

• Manufacturer Part Number: DO-CPLD-DK-G
• Description: KIT DESIGN CPLD W/BATT HOLDER
• Manufacturer: Xilinx Inc
• Series: CoolRunner™- IIr
• Type: CPLDr

Specifications of DO-CPLD-DK-G

• Contents: Proto Board, Download Cable, Samples, Software
• For Use With/related Products: CoolRunner-ll, XC9500XL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 122-1512

State Machine Editor
Programmable Logic Design
June 12, 2006
R
For our traffic light design, the counter acts as a timer that determines the transitions of a
state machine. The state machine will run through four states, each state controlling a
combination of the three lights.
To invoke the state machine editor:
1.
2.
process if necessary. To take a snapshot of your design select Project → Take
Snapshot.
Taking a snapshot of your project saves the current state of your project in a
subdirectory (with the same name as the snapshot) so that you can go back to it in the
future. You can view project snapshots by selecting the Sources window snapshot tab
in the Project Navigator. If the design had only one module (one level of hierarchy), the
implementation phase would be the next step. This design, however, has a further
module to represent a more typical VHDL design.
State 1: Red Light
State 2: Red and Amber Light
State 3: Green Light
State 4: Amber Light
Select New Source from the project menu.
Highlight State Diagram and give it the name “stat_mac”
Figure 4-15: Project Snapshot Window
www.xilinx.com
State Machine Editor
63