Xilinx Spartan 3 FPGA Boards

Elbert V2 - Spartan 3A FPGA Development Board

4909 views February 18, 2016 admin 0

Introduction

elbertv2_4__09811.1437703972.1280.1280

Elbert V2 is an easy to use FPGA Development board featuring Xilinx Spartan-3A FPGA. Elbert V2 is specially designed for experimenting and learning system design with FPGAs. This development board features Xilinx XC3S50A TQG144 FPGA. The USB 2.0 interface provides fast and easy configuration download to the on-board SPI flash. You don’t need a programmer or special downloader cable to download the bit stream to the board.

Applications

  • Product Prototype Development
  • Home Networking
  • Signal Processing
  • Wired and Wireless Communications
  • Educational tool for schools and universities

Board features

  • FPGA: Spartan XC3S50A in TQG144 package
  • Flash memory: 16 Mb SPI flash memory (M25P16)
  • USB 2.0 interface for On-board flash programming
  • FPGA configuration via JTAG and USB
  • 8 LEDs, Six Push Buttons and 8 way DIP switch for user defined purposes
  • One VGA Connector
  • One Stereo Jack
  • One Micro SD Card Adapter
  • Three Seven Segment Displays
  • 39 IOs for user defined purposes
  • On-board voltage regulators for single power rail operation

How to Use Elbert V2 Spartan 3A FPGA Development Board

Components/Tools Required

Along with the module, you may need the items in the list below for easy and fast installation.

1. USB A to Mini B cable.
2. DC Power supply (Optional).

Connection Diagram

elbertv2-condiagram

This diagram should be used as a reference only. For detailed information, see Elbert V2 schematics at the end of this documentation. Details of individual connectors are as below.

USB Interface

elbertv2-usbinterfaceThe on board full speed USB controller helps a PC/Linux/Mac computer to communicate with this module. Use a USB A to Mini B cable to connect with a PC. By default the module is powered from USB so make sure not to overcrowd unpowered USB hubs (the picture on the left shows USB Mini connector).

DC Power Supply

elbertv2-dcpowersupplyThis module uses +5V power supply to function properly. By default the board is configured to use +5V supply from USB. So an external +5V power is not required unless USB port is unable to supply enough current. In most cases USB ports are capable of providing enough current for the module. Current requirement for this board largely depends on your application. Please consult FPGA datasheet for more details on power requirements. If for any reason, an external 5V power supply needs to be used for the module, the Power select jumper should be configured properly before connecting the power supply. Please refer to the marking on the board for more details.

Power Select

The Solder jumper is used to configure the power source for the board. The Solder jumper in pin 1 and 2 is shorted to switch the power source to on board USB port and pin 2 and 3 to use the external DC power.

JTAG Connector

JTAG connector provides access to FPGA’s JTAG pins. A XILINX platform cable can be used for JTAG programming.

elbertv2-jtag

VGA

The VGA interface provides this board the ability to generate VGA signals from FPGA and display information any Display/monitor that supports standard VGA connector. This VGA interface uses resistor network based DAC for easy use and code implementation. This 8 bit VGA interface can display up to 256 colors.

elbertv2-vga

Micro SD and Audio

Elbert V2 features a Micro SD adapter on-board. By installing a Micro SD card, you can add data logging, media storage and other file storage to your design.

Two IOs on the FPGA are dedicated for generating two channels of audio. Different audio tones can be generated by using PWM and Frequency synthesis.

elbertv2-microsd_audio

7Segment LED Display

This board features three 7-segment LED display multiplexed for low pin count operation. Each module can be separately turned on and off with the three switching transistors.

 

LED, Push Button and Dip Switch

Elbert V2 has six push button switches, an eight position DIP switch and eight LEDs for human interaction. All switches are directly connected to Spartan 3 FPGA and can be used in your design with minimal effort. The switches will require weak pull up on the GPIOs to be enabled. Please see a sample UCF (User Constraints File) to see how to enable pull-ups on IOs.

elbertv2-dipswitch

GPIOs

This board is equipped with 39 user IO pins that can be used for various custom applications. Pin assignments on the connectors are available in the tables below.

HEADER P1

Header Pin No.
Pin description Spartan-3A (XC3S50A-TQG144)Pin No.
1IO_L12P_3 31
2IO_L12N_3 32
3IO_L11P_3 28
4IO_L11N_3 30
5IO_L10P_3 27
6IO_L10N_3
29
7IO_L09P_3 24
8IO_L09N_3 25
9GNDNA
10GNDNA
11VCCAUXNA
12VCCAUXNA

HEADER P6

Header Pin No.
Pin description Spartan-3A (XC3S50A-TQG144)Pin No.
1IO_L08P_3/TRDY2/LHCLK6
19
2IO_L08N_3/LHCLK7 21
3IO_L07P_3/LHCLK4
18
4IO_L07N_3/LHCLK5 20
5IO_L06P_3/LHCLK2
15
6IO_L06N_3/IRDY2/LHCLK3
16
7IO_L05P_3/LHCLK0 12
8IO_L05N_3/LHCLK1
13
9GNDNA
10GNDNA
11VCCAUXNA
12VCCAUXNA

HEADER P2

Header Pin No.
Pin description Spartan-3A (XC3S50A-TQG144)Pin No.
1IO_L04P_3
10
2IO_L04N_3/VREF_3 11
3IO_L03P_3 7
4IO_L03N_3 8
5IO_L02P_3 3
6IO_L02N_3 5
7IO_L01P_3
4
8IO_L01N_3
6
9GNDNA
10GNDNA
11VCCAUXNA
12VCCAUXNA

HEADER P4

Header Pin No.
Pin description Spartan-3A (XC3S50A-TQG144)Pin No.
1IO_L12P_0/VREF_0 141
2IO_L12N_0/PUDC_B 143
3IO_L11P_0
138
4IO_L11N_0
139
5IO_L10P_0 134
6IO_L10N_0 135
7IO_L09P_0/GCLK10

130
8IO_L09N_0/GCLK11
132
9GNDNA
10GNDNA
11VCCAUXNA
12VCCAUXNA

HEADER P5

Header Pin No.
Pin description Spartan-3A (XC3S50A-TQG144)Pin No.
1IO_L07P_0/GCLK6
125
2IP_0/VREF_0
123
3IO_L07N_0/GCLK7
127
4IO_L06N_0/GCLK5 126
5IO_L08N_0/GCLK9 131
6IO_L07P_1/IRDY1/RHCLK6 91
7IO_0
142
8IP_0
140
9GNDNA
10VCCAUXNA

Driver Installation

Installing on Windows

elbertv2-inswindowsThis product requires a driver to be installed for proper functioning when used with Windows. The driver package can be downloaded from the product page. To install the driver, unzip the contents of the downloaded driver package to a folder. Attach USB cable to the PC and when asked by Windows device installation wizard, point to the folder where driver files are present. When driver installation is complete, the module should appear in Windows Device Manager as a serial port (see the picture on the right). Note down the name of the serial port (COM1, COM2 etc..). This information is required while programming the module with configuration tool.

Installing on Linux

To use this product with Linux, USB CDC driver needs to be compiled in with the kernel. Fortunately, most Linux distributions (Ubuntu, Redhat, Debian etc..) has this driver pre-installed. The chances of you requiring to rebuild the kernel to include the USB CDC driver is very slim. When connected to a Linux machine, this product should appear as a serial port in the /dev directory. Usually the name of the device will be “ttyACMx” or similar. The name may be different depending on the Linux distribution you have.

Installing on Mac

Similar to Linux, Mac operating system comes with the required drivers pre-installed. When connected to a Mac computer, the device should appear as a serial port.

Generating Bit Stream for Elbert V2

HDL design needs to be converted to bit stream before it can be programmed to FPGA. Elbert V2 at this time accepts only binary (.bin) bit stream created by XILINX ISE (http://www.xilinx.com/tools/webpack.htm). Once the HDL is synthesized, it is easy to create a binary bit stream out of it. Please follow the Steps below to generate binary bit stream from your design using ISE Web Pack.

Step 1: Right click on the “Generate Programming File” option in “Processes” window.

elbertv2-bitstreamstep1

Step 2: Select “Process Properties” from the pop up menu. In the dialog box, check “Create Binary Configuration File” Check box and click “Apply”.

elbertv2-bitstreamstep2

Step 3: Click “OK” to close the dialog box. Right click on “Generate Programming File” option again and select “Run”. Now you will be able to find a .bin file in the project directory and that file can be used for Elbert V2 configuration.

Powering Up Elbert V2

Elbert V2 can be powered directly from USB port so make sure that you are using a USB port that can power the board properly. It is recommended to connect the board directly to the PC instead using a hub. It is practically very difficult to estimate the power consumption of the board, as it depends heavily on your design and the clock used. XILINX provides tools to estimate the power consumption. In any case if power from USB is not enough for your application, an external supply can be applied to the board. Elbert V2 requires two different voltages, a 3.3V and a 1.2V supply. On-board regulators derive these voltages from the USB/Ext power supply.

Configuring Elbert V2

The Elbert V2 Spartan6 module can be configured by two methods,

a) Using Elbert V2 configuration tool through USB.
b) Using the Xilinx programming cable..

Configuring Elbert V2 Using Configuration Tool

Elbert V2 has an on-board micro-controller which facilitates easy reprogramming of on-board SPI flash through USB interface. The micro-controller receives bit stream from the host application and program it in to the SPI Flash and lets the FPGA boot from the flash. The Elbert V2 configuration application can be downloaded from www.numato.com for free. When Elbert V2 is connected to PC, it shows up as a COM port in Device Manager. Run configuration application, select proper COM Port before downloading bit stream. Click on “Open File” to select the bit stream file (.bin) and press “Program” button to download the bit stream. Wait till the download process is finished. Once the download process is over, the configuration controller will try to boot the FPGA from the SPI Flash automatically. Follow the below steps.

Step 1: Open Elbert V2 Configuration Tool. Select the port no.(Refer “Driver installation” for more information on finding port no.) Click Open file and select the .bin file.

elbertv2-configtoolstep1

Step 2: Click on “Program” button. Wait till “Done” appears on the screen.

elbertv2-configtoolstep2

Configuring Elbert V2 Using JTAG

Elbert V2 Spartan6 module features an on-board JTAG connector which facilitates easy reprogramming of SRAM and on-board SPI flash through JTAG programmer like “XILINX Platform-cable usb”. Programming Elbert V2 using JTAG requires “XILINX ISE iMPACT” software which is bundled with XILINX ISE Design Suite. To program the SPI flash we need a “.mcs” file needs to be generated from the “.bit” file. Steps for generating “.mcs” file is discussed below. Programming FPGA SRAM does not require a mcs file to be generated.

Generating “.mcs” file for Elbert V2

Step 1: Open ISE iMPACT. Click on “Create PROM file(PROM file formatter)”.In the dialog box, select “Configure Single FPGA” in storage device type. Then click on the green arrow at the right side.

elbertv2-jtagstep1

Step 2: Select 16M in Storage Device (bits) list. Now click on “Add Storage Device”, then the green arrow at the right side.

elbertv2-jtagstep2

Step 3: Set an output file name and an output file location (the “.mcs” file will be generated at this location which will be required later for programming the FPGA), then click OK twice, then select the “.bit” file we already generated then click Open and click NO when it prompts to add another device file.

elbertv2-jtagstep3

Step 4: Double click on “Generate File”. “Generate Succeeded” will be displayed as shown in fig below if the mcs file is generated successfully.

elbertv2-jtagstep4

Programming FPGA Using ISE iMPACT

Step 1: Open ISE iMPACT. Click on “Boundary Scan” in the iMPACT flows window in the left top corner. Then right click on the window panel in the right side. Select “Initialize Chain”.

elbertv2-impactstep1

Step 2: If the device is detected properly you will get a pop up window as shown below, Click OK. Then right click on the SPI/BPI (next to the black arrow in the below fig.), select Add SPI/BPI Flash.

elbertv2-impactstep2

Step 3: Select the “.mcs” file we already created and click OK. Now choose “M25P16” in the dialogue box appeared, then click OK.

Step 4: Click on “Flash”, Double Click on Program, select OK. If the programming is successful, a confirmation message will be displayed.

elbertv2-impactstep4

Technical Specifications

Parameter *
Value Unit
Basic Specifications
Number of GPIOs 39
Number of LEDs 8
Number of Push Buttons
6
SPI Flash Memory (M25P16)
16 Mb
Power supply voltage (USB or external) 5 - 7 V
FPGA Specifications
Internal supply voltage relative to GND –0.5 to 1.25 V
Auxiliary supply voltage relative to GND –0.5 to 3.75 V
Output drivers supply voltage relative to GND –0.5 to 3.75 V

Mechanical Dimensions

elbertv2-dimensions

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