vovaui.blogg.se - Clock wizard

Clock wizard how to#
Clock wizard generator#
Clock wizard code#
Clock wizard download#

Optional – rename the clock signals so they show what frequency they provide. It must be placed in the architecture header portion of your VHDL file – so anywhere between architecture and begin:Ĭopy the Instantiation section from your *.vho file:Īnd paste it into the architecture body section of your top level VHDL file.

Clock wizard how to#

The first section defines the component and the second section defines how to instantiate that component.Īnd paste it into your top level VHDL file. If you scroll down you will see two sections. This will open up a *.vho file in the text editor.

Double click “View HDL Instantiation Template”.

Clock wizard generator#

Go under Processes and expand the Core Generator.

Click on your *.xco file that you created in the previous step.

The easiest way to do this is to use the HDL Instantiation Template included with the *.xco file.

Clock wizard code#

Now that we have run the clocking wizard and we have an *.xco file in our project we need to actually place those clocks into our VHDL code and make use of them. In I/O and Feedback page uncheck the RESET and LOCKED signals since we will not be using them in our simple clocks.Ĭlick Generate to complete the wizard – you will see a new *.xco file show up in your project: We are going to create three clocks outputs: 25Mhz, 10Mhz, 5Mhz.īe sure that Drives is set to BUFG since we want our generated clocks to be fed into a Global Clock Buffer which makes them easier to use within the FPGA. We can put just about anything in here and it will tell us how close it can get. This is where we define the frequency of the clocks that we want to generate. We could be connecting the input into a differential clock input or an internal clock input…) (Our Oscillator is connected to a special clock input capable pin.

Make sure source is a “Single ended clock capable pin”.

Type 32 into the Input Clock Primary Value Field (This says our oscillator provides a 32Mhz clock).

Right click your top level project file and choose “New Source”Ĭlick on “IP (Core Generator & Architecture Wizard)” and provide a file name and hit “Next”: Run the clocking wizard to generate your desired clocks To avoid any errors you should comment out any lines from the ucf file that are not being used. Comment all unused lines from the ucf file You should also have A(0.15), B(0.15), and C(0.15) defined which sets up the locations of the pins on the Papilio FPGA. NET CLK LOC="P94" | IOSTANDARD=LVTTL | PERIOD=31.25ns # CLK Define Row A,B,C pins It will look something like this but the LOC could be different depending on your Papilio board. There should be a line that defines CLK and sets the Period to 31.25 which is the period for a 32Mhz clock. You should see the following important sections: The clock definition Open the ucf file, unique to your Papilio board, that you should have downloaded and added to the project earlier. The outputs of the counter are attached to the output pins of your Papilio FPGA board. This code pulls the 32Mhz clock from your Papilio FPGA board and then uses it to drive a 48 bit counter. Pins are connected to the counter to cause blinking at varying frequencies Signal counter : STD_LOGIC_VECTOR(47 downto 0) := (others => '0') Port ( A : out STD_LOGIC_VECTOR (15 downto 0) Īrchitecture Behavioral of WebPack_QuickStart is Add VHDL Source CodeĪdd the following source code to your project: library IEEE In this tutorial we will use the Clocking Wizard to attach a different clock to the counters. The project we will be using has counters setup on the pins of the Papilio FPGA board.

Clock wizard download#

Be sure to download the correct ucf file for your Papilio board from the GadgetFactory ucf Downloads section.

You can also download the existing Xilinx ISE project from GitHub. Please follow the Getting Started with Xilinx ISE WebPack guide for the Papilio FPGA boards to get a new project setup in Xilinx ISE. It is definitely the easiest way to generate custom clocks for your FPGA project. The Xilinx clocking wizard easily generates custom clock speeds with all of the Global Clock buffers and supporting circuitry automatically created for you. This tutorial shows you how to generate custom clocks inside your FPGA using the simple Clocking Wizard. Easily create clocks at any speeds such as 100Mhz, 75Mhz, or 50Mhz from the 32Mhz oscillator connected to your Papilio FPGA.