This version (09 Jan 2021 00:52) was approved by Robin Getz.The Previously approved version (09 Oct 2013 16:47) is available.
Table of Contents
AD8403 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design
Supported Devices
Evaluation Boards
Overview
This document presents the steps to setup an environment for using the EVAL-AD8403SDZ evaluation board together with the Xilinx KC705 FPGA board and the Xilinx Embedded Development Kit (EDK). Below is presented a picture of the EVAL-AD8403SDZ Evaluation Board with the Xilinx KC705 board.
For component evaluation and performance purposes, as opposed to quick prototyping, the user is directed to use the part evaluation setup. This consists of:
- 1. A controller board like the SDP-B ( EVAL-SDP-CS1Z)
- 2. The component SDP compatible product evaluation board
- 3. Corresponding PC software ( shipped with the product evaluation board)
The SDP-B controller board is part of Analog Devices System Demonstration Platform (SDP). It provides a high speed USB 2.0 connection from the PC to the component evaluation board. The PC runs the evaluation software. Each evaluation board, which is an SDP compatible daughter board, includes the necessary installation file required for performance testing.
Note: it is expected that the analog performance on the two platforms may differ.
Below is presented a picture of SDP-B Controller Board with the EVAL-AD8403SDZ Evaluation Board.
The AD8403 is a quad-channel, 256-position, digitally controlled variable resistor device. This device performs the same electronic adjustment function as a mechanical potentiometer or variable resistor. The AD8403 contains four independent variable resistors. Each variable resistor offers a completely programmable value of resistance between the A terminal and the wiper or the B terminal and the wiper. The fixed A-to-B terminal resistance of 1 kO, 10 kO, 50 kO, or 100 kO has a ±1% channel-to-channel matching tolerance with a nominal temperature coefficient of 500 ppm/°C.
The EVAL-AD8403SDZ evaluation board is designed to help customers quickly prototype new AD8403 circuits and reduce design time. The EVAL-AD8403SDZ incorporates several test circuits to evaluate the AD8403 performance.
More information
- AD8403 Product Info - pricing, samples, datasheet
Getting Started
The first objective is to ensure that you have all of the items needed and to install the software tools so that you are ready to create and run the evaluation project.
Required Hardware
- FMC-SDP adapter board
- EVAL-AD8403 evaluation board
Required Software
- Xilinx ISE 14.6.
- UART Terminal (Termite/Tera Term/Hyperterminal), baud rate 115200.
Downloads
- Xilinx Boards Common Drivers: https://github.com/analogdevicesinc/no-OS/tree/master/platform_drivers/Xilinx/SDP_Common
- EDK KC705 Reference project: https://github.com/analogdevicesinc/fpgahdl_xilinx/tree/master/cf_sdp_kc705
Hardware setup
Before connecting the ADI evaluation board to the Xilinx KC705 make sure that the VADJ_FPGA voltage of the KC705 is set to 3.3V. For more details on how to change the setting for VADJ_FPGA visit the Xilinx KC705 product page.
- Use the FMC-SDP interposer to connect the ADI evaluation board to the Xilinx KC705 board on the FMC LPC connector.
- Connect the JTAG and UART cables to the KC705 and power up the FPGA board.
Reference Project Overview
The following commands were implemented in this version of EVAL-AD8403 reference project for Xilinx KC705 FPGA board.
| Command | Description |
|---|---|
| help? | Displays all available commands. |
| rdac= | Load the wiper register with a give value. Accepted values: channel: 0 - select RDAC 1 wiper register. 1 - select RDAC 2 wiper register. 2 - select RDAC 3 wiper register. 3 - select RDAC 4 wiper register. value: 0 .. 255 - value to be written in register. |
| rdac? | Read back the value of the wiper register. Accepted values: channel: 0 - select RDAC 1 wiper register. 1 - select RDAC 2 wiper register. 2 - select RDAC 3 wiper register. 3 - select RDAC 4 wiper register. |
| wbuf1? | Read back the value of the Wiper Buffer in voltage. (VDD=3.2V) |
| shutdown= | Shutdown connects wiper to B terminal and open circuits the A terminal. Accepted values: channel: 0 - select RDAC 1 wiper register. 1 - select RDAC 2 wiper register. 2 - select RDAC 3 wiper register. 3 - select RDAC 4 wiper register. |
| shutdown? | Notify about the state of the selected RDAC. Accepted values: channel: 0 - select RDAC 1 wiper register. 1 - select RDAC 2 wiper register. 2 - select RDAC 3 wiper register. 3 - select RDAC 4 wiper register. |
Commands can be executed using a serial terminal connected to the UART peripheral of Xilinx KC705 FPGA.
The following image shows a generic list of commands in a serial terminal connected to Xilinx KC705 FPGA's UART peripheral.
Software Project Setup
The hardware platform for each reference projects with FMC-SDP interposer and KC705 evaluation board is common. The next steps should be followed to recreate the software project of the reference design:
- First download the KC705 Reference project from Github on your computer. You can do this by clonning this repository: https://github.com/analogdevicesinc/fpgahdl_xilinx.
- From this entire repository you will use cf_sdp_kc705 folder. This is common for all KC705 projects.
- Open the Xilinx SDK. When the SDK starts, it asks you to provide a folder where to store the workspace. Any folder can be provided. Make sure that the path where it is located does not contain any spaces.
- In the SDK select the File→Import menu option to import the software projects into the workspace.
- In the Import window select the General→Existing Projects into Workspace option.
- In the Import Projects window select the cf_sdp_kc705 folder as root directory and check the Copy projects into workspace option. After the root directory is chosen the projects that reside in that directory will appear in the Projects list. Press Finish to finalize the import process.
- The Project Explorer window now shows the projects that exist in the workspace without software files.
- Now the software must be added in your project. For downloading the software, you must use 3 links from Github given in Downloads section. From there you'll download the specific driver, the specific commands and the Xilinx Boards Common Drivers(which are commons for all Xilinx boards). All the software files downloaded must be copied in src folder from sw folder.
- Before compilation in the file called Communication.h you have to uncomment the name of the device that you currently use. In the picture below there is an example of this, which works only with AD5629R project. For another device, uncomment only the respective name. You can have one driver working on multiple devices, so the drivers's name and the uncommented name may not be the same for every project.
- The SDK should automatically build the project and the Console window will display the result of the build. If the build is not done automatically, select the Project→Build Automatically menu option.
- If the project was built without any errors, you can program the FPGA and run the software application.
More information
- Example questions:
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resources/fpga/xilinx/interposer/ad8403.txt · Last modified: 09 Jan 2021 00:49 by Robin Getz