Adding Custom IP to the System

Adding Custom IP to the System
Lab Workbook
Adding Custom IP to the System
Adding Custom IP to the System
Introduction
This lab guides you through the process of creating and adding a custom peripheral to a processor
system by using the Vivado IP Packager. You will create an AXI4Lite interface peripheral.
Objectives
After completing this lab, you will be able to:
•
•
•
•
•
Use the IP Packager feature of Vivado to create a custom peripheral
Modify the functionality of the IP
Add the custom peripheral to your design
Add pin location constraints
Add block memory to the system
Procedure
This lab is separated into steps that consist of general overview statements that provide information on
the detailed instructions that follow. Follow these detailed instructions to progress through the lab.
This lab comprises 4 primary steps: You will use a peripheral template to create a peripheral, Package
the IP using IP Packager, import, add and connect the IP in the design, add the Block RAM (BRAM)
Memory and generate the bitstream.
Design Description
You will extend the Lab 2 hardware design by creating and adding an AXI peripheral (refer to LED_IP in
Figure 1) to the system, and connecting it to the LEDs on the ZedBoard. You will use the IP Packager to
generate the custom IP. Next, you will connect the peripheral to the system and add pin location
constraints to connect the LED display controller peripheral to the on-board LED display. Finally, you will
add BRAM Controller and BRAM before generating the bitstream.
Figure 1 Design Updated from Previous Lab
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Adding Custom IP to the System
General Flow for this Lab
Step 1:
Create
Custom IP
using
Peripheral
Template
Step 2:
Package
Peripheral
using IP
Packager
Step 3:
Set the
Project
Settings
Step 4:
Add the IP.
BRAM, and
Constraints
Create a Custom IP using the Create and Package IP Wizard
1-1.
Step 1
Use the provided axi_lite slave peripheral template and the custom IP
source code to create a custom IP.
1-1-1. Open Vivado by selecting Start > All Programs > Xilinx Design Tools > Vivado 2013.3 >
Vivado 2013.3
1-1-2. Click Manage IP and select New IP Location and click Next in the New IP Location window
1-1-3. Select Verilog as the Target Language, Mixed as the Simulator language, and for IP location,
type C:\xup\embedded\labs\led_ip and click Finish (leave other settings as defaults)
A Virtex 7 part is chosen for this project, but later compatibility for other devices will be added to the
packaged IP later.
1-1-4. Click OK to create the led_ip directory.
1-2.
Run the Create and Package IP Wizard
1-2-1. Select Tools > Create and Package IP
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1-2-2. In the window, click Next
1-2-3. Select Create New AXI4 Peripheral, specify the IP Definition location as
C:/xup/embedded/labs/led_ip and click Next
1-2-4. Fill in the details for the IP
Name: led_ip
Display Name: led_ip_v1_0
(Fill in a description, Vendor Name, and URL)
1-2-5. Click Next
1-2-6. Change the Name of the interface to S_AXI
1-2-7. Leave the other settings as default and click Next (Lite interface, Slave mode, Data Width 32,
Registers 4)
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1-2-8. Select Generate Drivers and click Next
1-2-9. Select Add IP to Catalog and open IP in editing session selected and click Finish
1-2-10. In the sources panel, double-click the led_ip_v1_0.v file and scroll down to line 15 where last
port is defined.
1-2-11. Add the line:
output wire [7:0]
LED,
(Notice the extra comma needed at the end of line)
1-2-12. Insert the following at line ~48:
. LED(LED),
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1-2-13. Save the file by selecting File > Save File
1-2-14. Expand led_ip_v1_0 in the sources view if necessary, and open led_ip_v1_0_S_AXI.v
1-2-15. Add the LED port to this file too, at line 15
1-2-16. Scroll down to ~line 397 and insert the following code to instantiate the user logic for the LED IP
(This code can be typed directly, or copied from the user_logic_instantiation.txt file in the lab3 source
folder.)
Check all the signals that are being connected and where they originate.
1-2-17. Save the file by selecting File > Save File
1-2-18. Click on the Add Sources in the Flow Navigator pane, select Add or Create Design Sources,
browse to c:\xup\embedded\sources\lab3, select the lab3_user_logic.v file and click OK, and
then click Finish to add the file.
Check the contents of this file to understand the logic that is being implemented. Notice the formed
hierarchy.
1-2-19. Click on the Package IP – led_ip tab
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1-2-20. For the IP to appear in the IP catalog in particular categories, the IP must be configured to be part
of those categories. To change which categories the IP will appear in the IP catalog click the
browse box on the Categories line. This opens the Choose IP Categories window
1-2-21. For the exercise purpose, uncheck the AXI Peripheral box and check the Basic Elements and
click OK.
Figure 2 Specify the category for IP Packager IP
1-2-22. Select IP Compatibility. This shows the different Xilinx FPGA Families that the IP supports. The
value is inherited from the device selected for the project.
1-2-23. Right click in the Family Support table and select Add Family… from the menu.
1-2-24. Select the Zynq family as we will be using this IP on the ZedBoard, and click OK.
1-2-25. You can also customize the address space and add memory address space using the IP
Addressing and Memory category. We won’t make any changes.
1-2-26. Click on IP File Groups and click Merge changes from IP File Groups Wizard
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This is to update the IP Packager with the changes that were made to the IP and the lab3_user_logic.v
file that was added to the project.
1-2-27. Do the same for IP Customization Parameters (Merge changes from IP Customization
Parameters Wizard)
Notice that the IP Ports view now shows the user created LED port
2-1-1. Click Run Synthesis and Save if prompted. (This is to check the design synthesizes correctly
before adding it to the main design.
2-1-2. Check the Messages tab for any errors and correct if necessary before moving to the next
step
When Synthesis completes successfully, click Cancel.
2-1-3. Select Review and Package, and click Re-Package IP
2-1-4. In the Vivado window click File > Close Project
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Modify the Project Settings
3-1.
Step 3
Open the previous project, or use the lab2 project from the labsolution
directory, and save the project as lab3. Set Project Settings to point to the
created IP repository.
3-1-1. Start the Vivado if necessary and open either the lab2 project you created in the previous lab or
the lab2 project in the labsolution directory
3-1-2. Select File > Save Project As … to open the Save Project As dialog box. Enter lab3 as the
project name. Make sure that the Create Project Subdirectory option is checked, the project
directory path is c:\xup\embedded\labs\ and click OK.
This will create the lab3 directory and save the project and associated directory with lab3 name.
3-1-3. Click Project Settings in the Flow Navigator pane.
3-1-4. Select IP in the left pane of the Project Settings form.
3-1-5. Click on the Add Repository… button, browse to c:\xup\embedded\labs\led_ip and click
Select.
The led_ip_v1_0 IP will appear the IP in the Selected Repository window.
Figure 3 Specify IP Repository
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3-1-6. Click OK.
Add the Custom IP, BRAM, and the Constraints
4-1.
Step 4
Add led_ip to the design and connect to the AXI4Lite interconnect in the
System Assembly View. Make internal and external port connections.
Establish the LED port as external FPGA pins.
4-1-1. Click Open Block Design under IP Integrator in the Flow Navigator pane, and select system.bd
to open IP Integrator
4-1-2. Click the Add IP icon
field.
and search for led_ip_v1_0 in the catalog by typing “led” in the search
Figure 4 Searching for led_ip in the IP Catalog
4-1-3. Double-click led_ip_v1_0 to add the core to the design
4-1-4. Select the IP in the block diagram and change the instance name to led_ip in the properties view
4-1-5. Click on Run Connection Automation, select /led_ip/S_AXI and click OK to automatically make
the connection from the AXI Interconnect to the IP.
4-1-6. Click the regenerate button (
) to redraw the diagram.
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Figure 5 LED IP Block added and connected
4-1-7. Select the LED[7:0] port on the led_ip instance (by clicking on its pin), right-click and select Make
External.
Figure 6 LED external port added and connected
4-1-8. Select the Address Editor tab and verify that an address has been assigned to lep_ip.
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Figure 7 Address assigned for led_ip
4-1-9. Select Tools > Validate Design to run the design rules checker. There should not be any
violations.
4-2.
Update the top-level wrapper and add the provided lab3_system.xdc
constraints file.
4-2-1. In the sources view, right-click on the block diagram file, system.bd, and select Create HDL
Wrapper to update the HDL wrapper file, and when prompted, select Let Vivado Manage
Wrapper and auto-update and click OK
The system_wrapper.vhd file will be updated to include the new IP and ports. Double-click on the
system-wrapper content to verify that LED port has been added.
4-2-2. Click Add Sources in the Flow Navigator pane, select Add or Create Constraints, and click
Next.
4-2-3. Click the Add Files button, browse to the c:\xup\embedded\sources\lab3 folder, select
lab3_system.xdc
4-2-4. Click Finish to add the file.
4-2-5. Expand Constraints folder in the Sources pane, and double-click lab3_system.xdc file entry to
see its content. This file contains the pin locations and IO standards for the LEDs on the
Zedboard. This information can usually be found in the manufacturer’s datasheet for the board.
This part of the lab, creating and adding custom IP is now complete. The next lab will require
Block RAM memory which will be added now.
4-3.
Add BRAM to the design
4-3-1. In the Block Diagram, click the Add IP icon
AXI BRAM Controller
and search for BRAM and add one instance of the
4-3-2. Run connection automation, on axi_bram_ctrl_0/S_AXI and click OK when prompted to connect
it to the M_AXI_GP0 Master.
4-3-3. Double click on the block to customize it and change the number of BRAM interfaces to 1 and
click OK.
Notice that the AXI Protocol being used is AXI4 instead of AXI4Lite since BRAM can provide
higher bandwidth and the controller can support burst transactions.
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Figure 8 Customize BRAM controller
4-3-4. Run Connection Automation to add and connect a Block Memory Generator (This could be
added manually)
4-3-5. Validate the design to ensure there are no errors, and click the regenerate button (
the diagram.
The design should look similar to the figure below.
Figure 9 Completed Block Diagram
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) to redraw
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Adding Custom IP to the System
4-3-6. In the Address editor, increase the Range of the axi_bram_ctrl_0 to 8K
Figure 12 Assigning address range
4-3-7. In the sources view, right click on the system.bd block diagram file and select Create HDL
wrapper (Click OK when prompted)
4-3-8. Press F6 to validate the design one last time.
4-3-9. If there are no errors, click on the Generate Bitstream in the Flow Navigator to run the synthesis,
implementation, and bitstream generation processes. (Click Save if prompted.)
4-3-10. Click Yes to run the synthesis process again as the design has changed.
4-3-11. When the build completes, click OK if prompted to open the Implemented design.
Conclusion
Vivado IP packager was used to import a custom IP block into the IP library. The IP block was then added
to the system. Connection automation was run where available to speed up the design of the system by
allowing Vivado to automatically make connections between IP. Pin location constraints were added to
the design. Finally, an additional BRAM was added to the design, and the design was built (bitstream
generated) in preparation for the next lab.
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