![]() ![]() You don’t need to remember the exact VHDL syntax as you can go to Window>Language Templates>Synthesis Constructs>Process>Posedge Clocked>/w Sync Low Reset and copy the template code from the preview window into the architecture section. Now we have the VHDL entity which defines the module port interface and an empty architecture part where we should describe the implementation.įor the counter we will need to add a clocked process. Then as before I’ll add one VHDL module called LedCounter which has one clock input port and 4 LED output ports. ![]() Let’s start Vivado and create a new project (RTL project like before) called LedCounter.įirst I’ll create a new constraint file (LedCounter.xdc) and add the clk and led port definitions there. The clock port name is CLK100MHZ but let’s change that to ‘clk’ for simplicity. For the clock signal the file also specifies the clock period (10ns) and duty cycle (50%). That will enable me to start experimenting with sequential logic design.Īs mentioned at the end of the previous post Digilent provides a master constraint file (Arty_Master.xdc) that defines all the FPGA pin connections for us. The next step I’m going to try with the Arty board is to connect the 100 MHz clock signal to the FPGA.
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