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Xilinx Spartan-7 FPGA Maker Board by Digilent - Review

Scoring

Product Performed to Expectations: 10
Specifications were sufficient to design with: 10
Demo Software was of good quality: 9
Product was easy to use: 8
Support materials were available: 10
The price to performance ratio was good: 9
TotalScore: 56 / 60
  • RoadTest: Xilinx Spartan-7 FPGA Maker Board by Digilent
  • Buy Now
  • Evaluation Type: Development Boards & Tools
  • Was everything in the box required?: Yes - User need to have a USB to micro-USB cable and optionally a 7-15v DC power supply
  • Comparable Products/Other parts you considered: 1. Arty A7: Artix-7 FPGA Development Board for Makers and Hobbyists - has additional 10/100 Mbps Ethernet port comparing to this board. 2. Arty Z7: APSoC Zynq-7000 Development Board for Makers and Hobbyists - has more additional ports like HDMI, Gigabit Ethernet, microSD slot and Zynq-7000 AP SoC.
  • What were the biggest problems encountered?: 1. Vivado Design Suite is a heavy application and require a lot of resources. 2. More tutorials and examples with usage of specific peripherals and modules from IP catalogue. The demo with GPIO and XADC is very good example of this kind of guides.

  • Detailed Review:

    1. My application

    I applied for this roadtest with basic knowledge of FPGA design with purpose of create simple project in Test & Measurement area from makers/hobbyist perspective. I would like to thank Element14 and Digilent for opportunity to test the Arty S7 board.

     

    2. Unboxing and initial impression

    {gallery} Digilent ARTY S7 Dev Board

    box1

    Digilent ARTY S7 Dev Board

    box2

    Digilent ARTY S7 Dev Board

    box3

    Digilent ARTY S7 Dev Board

    box4

    Digilent ARTY S7 Dev Board

    The board arrived to me via UPS. The small box contains the Digilent ARTY S7 Board protected by two layers of pink foam. The board is very small and well made. My board is in revision B. After connection board to the supply we see nice demo program which control a LEDs and allow to change RGB LEDs color by pressing or switching button. The reference manual page: Digilent Arty S7 is really good start point to get familiar with this board. We have there all information about board versions, pinouts or functional description of components. I really like this kind of documentation where all need information is in one place. Below is description of board components.

    pinout

    1. FPGA programming DONE LED

    2. Shared USB JTAG / UART port

    3. Power select jumper (Ext. supply / USB)

    4. Power jack (for optional ext. supply)

    5. Power good LED

    6. User LEDs

    7. User RGB LEDs

    8. User slide switches

    9. User push buttons

    10. Arduino/ChipKIT shield connectors

    11. SPI header (Arduino/ChipKIT compatible)

    12. Arduino IDE reset jumper

    13. FPGA programming mode (JTAG/ Flash)

    14. Processor reset

    15. Pmod headers

    16. FPGA programming reset button

    17. SPI Flash

    18. Spartan-7 FPGA

    19. DDR3L memory

    20. Analog devices ADP 5052 power supply

    3. Environment setup

    I am using Debian on notebook, so I downloaded Vivado HLx 2018.2 in version with all OS installer. It is quite big file which have size around 18 GB. There is also available version with self extracting web install for Linux systems. After download a file we need to do following steps to launch installer.

    1. Extract archive with Xilinx Vivado SDK 2018.2
    tar -xvf Xilinx_Vivado_SDK_2018.2_0614_1954.tar.gz
    
    2. Go to directory with Xilinx Vivado
    cd Xilinx_Vivado_SDK_2018.2_0614_1954
    
    3. Launch Vivado 2018
    ./xsetup

    Each step of installation is presented in below gallery.

    {gallery} Vivado 2018.2 Installer

    step1

    Step 1: Basic information about installation

    step2

    Step 2: Information about license

    step3

    Step 3: Selection of edition to install

    step4

    Step 4: Additional customization of given edition installation

    step5

    Step 5: Selection of destination directory

    step6

    Step 6: Installation summary

    step7

    Step 7: Installation progress

    Now we need to install cable drivers. It could be done by following steps:

    cd opt/Vivado/2018.2/data/xicom/cable_drivers/lin64/install_script/install_drivers/
    sudo ./install_drivers

    Now we could get license for this product. I have decided to use free ISE WebPACK license. To do that we need to register at Xilinx webpage. Below gallery describes step by step how to setup license.

    {gallery} ISE WebPACK license

    step1

    Step 1: Open Vivado License Manager 2018.2

    step2

    Step 2: Choose option 'Obtain license'. Select given license and press 'Connect Now'

    step3

    Step 3: Log in to Xilinx page

    step4
    Step 4: Select given license to obtain

    step5

    Step 5: Generate and send license to e-mail

    step6

    Step 6: Download the license file

    step7

    Step 7: Choose option 'Load License' in Vivado License Manager 2018.2

    step8

    Step 8: Choose option 'Copy License'. Select file with license

    step9

    Step 9: Check license status

    Now your Vivado 2018.2 is completely ready for adventures with FPGA :).

     

    To get familiar with board and Vivado suite I started from this tutorial: vivado_start.In this tutorial based on simple example of controlling the LED we are getting all basic information to create our own project. This simple example with connection of two demos projects: GPIO and XDAC gives me nice overview of the board and Vivado software. At this stage I had only one issue with the uploading of the bitstream. By I found solution for this issue on support page. Issue was caused by no drivers for JTAG in my system. The main focus in this review I put on the project.

    Here is simple example of driving a single seven segment display with usage of this board:
    Example with seven segment display

    4. The project

    My basic idea was to use this FPGA board to analyse ECG signal received from the analog front end. Here is diagram of this system:

    diagram

    ECG signal is received by AFE by 3-electrodes (two for receiving data and one for provide signal for reduce noise). Typical AFE for ECG contains instrumentation amplifier, simple signal conditioning with HP and LP filtering and component for noise reduction (called RLD). Here is example diagram of typical AFE:

    afe

    My AFE have following schematic:

    schematic

    At the input we have instrumentation amplifier INA326 with input protection and RFI filter. This stage has gain equal 5.13. Second stage (IC1/IC2) is bandpass filter with following band: 0.05 - 258 Hz and gain equal to 14.7. The "right leg drive" (IC3) has gain 19.5 and cut frequency equal 4 kHz. Here is 3D model of PCB and real module for ECG signal acquisition.

    pcb

     

    module

    Module requires 3.3 V power supply. Output data could be sampled by ADC. Here is output signal collected by oscilloscope.

    signal

    On sampled data we could run QRS peak detection based on the Pan-Tompkins algorithm. Here is flow of Pan-Tompkins algorithm:

    pt

    In the first step the algorithm passes the signal through bandpass filter in order to reduce the influence of the muscle noise, the baseline wander and the T-wave interference. In our case we have additional filtering in AFE. Here is LP filter formula:
    y(n) = 2y(n-1)-y(n-2)+x(n)-2x(n-6)+x(n-12)

    Here is HP filter formula:

    y(n) = y(n-1)-1/32x(n)+x(n-16)-x(n-17)+1/32x(n-32)

    After filtering the signal is differentiated to provide the QRS slope information. Here is formula:
    y(n)=1/8[2x(n)+x(n-1)-x(n-3)-2x(n-4)]

    Then the signal is squared point by point for emphasizing the higher frequencies. Here is formula:

    y(n)=x^2(n)

    After this stage, the algorithm performs sliding window integration in order to obtain waveform feature information. Here is formula:

    y(n)=1/N[x(n-(N-1))+x(n-(N-2))+...+x(n)], where N is the size of sliding window and depends on the sampling rate (200 samples/sec -> N=30).

    A temporal location of the QRS is marked from the rising edge of the integrated waveform.

    I used integrated XADC to collect data from AFE and Verilog implementation of Pan-Tompkins algorithm. As output I used LED2 to blinks during detection of R peak.

     

    First step was to create empty project for the ARTY S7 Board. I have loaded the proper constraints file.
    cons

    Then I uncommented 100Mhz clock, LED2 output and XADC (12 bit ADC avaiable in this board) inputs vauxp0, vauxn0. Here is listing of constraints file.

    ## This file is a general .xdc for the Arty S7-50 Rev. B
    ## To use it in a project:
    ## - uncomment the lines corresponding to used pins
    ## - rename the used ports (in each line, after get_ports) according to the top level signal names in the project
    
    ## Clock signal
    #set_property -dict { PACKAGE_PIN F14   IOSTANDARD LVCMOS33 } [get_ports { CLK12MHZ }]; #IO_L13P_T2_MRCC_15 Sch=uclk
    #create_clock -add -name sys_clk_pin -period 83.333 -waveform {0 41.667} [get_ports { CLK12MHZ }];
    set_property -dict { PACKAGE_PIN R2    IOSTANDARD SSTL135 } [get_ports { CLK100MHZ }]; #IO_L12P_T1_MRCC_34 Sch=ddr3_clk[200]
    create_clock -add -name sys_clk_pin -period 10.000 -waveform {0 5.000}  [get_ports { CLK100MHZ }];
    
    ## Switches
    #set_property -dict { PACKAGE_PIN H14   IOSTANDARD LVCMOS33 } [get_ports { sw[0] }]; #IO_L20N_T3_A19_15 Sch=sw[0]
    #set_property -dict { PACKAGE_PIN H18   IOSTANDARD LVCMOS33 } [get_ports { sw[1] }]; #IO_L21P_T3_DQS_15 Sch=sw[1]
    #set_property -dict { PACKAGE_PIN G18   IOSTANDARD LVCMOS33 } [get_ports { sw[2] }]; #IO_L21N_T3_DQS_A18_15 Sch=sw[2]
    #set_property -dict { PACKAGE_PIN M5    IOSTANDARD SSTL135 } [get_ports { sw[3] }]; #IO_L6N_T0_VREF_34 Sch=sw[3]
    
    ## RGB LEDs
    #set_property -dict { PACKAGE_PIN J15   IOSTANDARD LVCMOS33 } [get_ports { led0_r }]; #IO_L23N_T3_FWE_B_15 Sch=led0_r
    #set_property -dict { PACKAGE_PIN G17   IOSTANDARD LVCMOS33 } [get_ports { led0_g }]; #IO_L14N_T2_SRCC_15 Sch=led0_g
    #set_property -dict { PACKAGE_PIN F15   IOSTANDARD LVCMOS33 } [get_ports { led0_b }]; #IO_L13N_T2_MRCC_15 Sch=led0_b
    #set_property -dict { PACKAGE_PIN E15   IOSTANDARD LVCMOS33 } [get_ports { led1_r }]; #IO_L15N_T2_DQS_ADV_B_15 Sch=led1_r
    #set_property -dict { PACKAGE_PIN F18   IOSTANDARD LVCMOS33 } [get_ports { led1_g }]; #IO_L16P_T2_A28_15 Sch=led1_g
    #set_property -dict { PACKAGE_PIN E14   IOSTANDARD LVCMOS33 } [get_ports { led1_b }]; #IO_L15P_T2_DQS_15 Sch=led1_b
    
    ## LEDs
    set_property -dict { PACKAGE_PIN E18   IOSTANDARD LVCMOS33 } [get_ports { led2 }]; #IO_L16N_T2_A27_15 Sch=led[2]
    #set_property -dict { PACKAGE_PIN F13   IOSTANDARD LVCMOS33 } [get_ports { led[1] }]; #IO_L17P_T2_A26_15 Sch=led[3]
    #set_property -dict { PACKAGE_PIN E13   IOSTANDARD LVCMOS33 } [get_ports { led[2] }]; #IO_L17N_T2_A25_15 Sch=led[4]
    #set_property -dict { PACKAGE_PIN H15   IOSTANDARD LVCMOS33 } [get_ports { led[3] }]; #IO_L18P_T2_A24_15 Sch=led[5]
    
    ## Buttons
    #set_property -dict { PACKAGE_PIN G15   IOSTANDARD LVCMOS33 } [get_ports { btn[0] }]; #IO_L18N_T2_A23_15 Sch=btn[0]
    #set_property -dict { PACKAGE_PIN K16   IOSTANDARD LVCMOS33 } [get_ports { btn[1] }]; #IO_L19P_T3_A22_15 Sch=btn[1]
    #set_property -dict { PACKAGE_PIN J16   IOSTANDARD LVCMOS33 } [get_ports { btn[2] }]; #IO_L19N_T3_A21_VREF_15 Sch=btn[2]
    #set_property -dict { PACKAGE_PIN H13   IOSTANDARD LVCMOS33 } [get_ports { btn[3] }]; #IO_L20P_T3_A20_15 Sch=btn[3]
    
    ## PMOD Header JA
    #set_property -dict { PACKAGE_PIN L17   IOSTANDARD LVCMOS33 } [get_ports { ja[0] }]; #IO_L4P_T0_D04_14 Sch=ja_p[1]
    #set_property -dict { PACKAGE_PIN L18   IOSTANDARD LVCMOS33 } [get_ports { ja[1] }]; #IO_L4N_T0_D05_14 Sch=ja_n[1]
    #set_property -dict { PACKAGE_PIN M14   IOSTANDARD LVCMOS33 } [get_ports { ja[2] }]; #IO_L5P_T0_D06_14 Sch=ja_p[2]
    #set_property -dict { PACKAGE_PIN N14   IOSTANDARD LVCMOS33 } [get_ports { ja[3] }]; #IO_L5N_T0_D07_14 Sch=ja_n[2]
    #set_property -dict { PACKAGE_PIN M16   IOSTANDARD LVCMOS33 } [get_ports { ja[4] }]; #IO_L7P_T1_D09_14 Sch=ja_p[3]
    #set_property -dict { PACKAGE_PIN M17   IOSTANDARD LVCMOS33 } [get_ports { ja[5] }]; #IO_L7N_T1_D10_14 Sch=ja_n[3]
    #set_property -dict { PACKAGE_PIN M18   IOSTANDARD LVCMOS33 } [get_ports { ja[6] }]; #IO_L8P_T1_D11_14 Sch=ja_p[4]
    #set_property -dict { PACKAGE_PIN N18   IOSTANDARD LVCMOS33 } [get_ports { ja[7] }]; #IO_L8N_T1_D12_14 Sch=ja_n[4]
    
    ## PMOD Header JB
    #set_property -dict { PACKAGE_PIN P17   IOSTANDARD LVCMOS33 } [get_ports { jb[0] }]; #IO_L9P_T1_DQS_14 Sch=jb_p[1]
    #set_property -dict { PACKAGE_PIN P18   IOSTANDARD LVCMOS33 } [get_ports { jb[1] }]; #IO_L9N_T1_DQS_D13_14 Sch=jb_n[1]
    #set_property -dict { PACKAGE_PIN R18   IOSTANDARD LVCMOS33 } [get_ports { jb[2] }]; #IO_L10P_T1_D14_14 Sch=jb_p[2]
    #set_property -dict { PACKAGE_PIN T18   IOSTANDARD LVCMOS33 } [get_ports { jb[3] }]; #IO_L10N_T1_D15_14 Sch=jb_n[2]
    #set_property -dict { PACKAGE_PIN P14   IOSTANDARD LVCMOS33 } [get_ports { jb[4] }]; #IO_L11P_T1_SRCC_14 Sch=jb_p[3]
    #set_property -dict { PACKAGE_PIN P15   IOSTANDARD LVCMOS33 } [get_ports { jb[5] }]; #IO_L11N_T1_SRCC_14 Sch=jb_n[3]
    #set_property -dict { PACKAGE_PIN N15   IOSTANDARD LVCMOS33 } [get_ports { jb[6] }]; #IO_L12P_T1_MRCC_14 Sch=jb_p[4]
    #set_property -dict { PACKAGE_PIN P16   IOSTANDARD LVCMOS33 } [get_ports { jb[7] }]; #IO_L12N_T1_MRCC_14 Sch=jb_n[4]
    
    ## PMOD Header JC
    #set_property -dict { PACKAGE_PIN U15   IOSTANDARD LVCMOS33 } [get_ports { jc[0] }]; #IO_L18P_T2_A12_D28_14 Sch=jc1/ck_io[41]
    #set_property -dict { PACKAGE_PIN V16   IOSTANDARD LVCMOS33 } [get_ports { jc[1] }]; #IO_L18N_T2_A11_D27_14 Sch=jc2/ck_io[40]
    #set_property -dict { PACKAGE_PIN U17   IOSTANDARD LVCMOS33 } [get_ports { jc[2] }]; #IO_L15P_T2_DQS_RDWR_B_14 Sch=jc3/ck_io[39]
    #set_property -dict { PACKAGE_PIN U18   IOSTANDARD LVCMOS33 } [get_ports { jc[3] }]; #IO_L15N_T2_DQS_DOUT_CSO_B_14 Sch=jc4/ck_io[38]
    #set_property -dict { PACKAGE_PIN U16   IOSTANDARD LVCMOS33 } [get_ports { jc[4] }]; #IO_L16P_T2_CSI_B_14 Sch=jc7/ck_io[37]
    #set_property -dict { PACKAGE_PIN P13   IOSTANDARD LVCMOS33 } [get_ports { jc[5] }]; #IO_L19P_T3_A10_D26_14 Sch=jc8/ck_io[36]
    #set_property -dict { PACKAGE_PIN R13   IOSTANDARD LVCMOS33 } [get_ports { jc[6] }]; #IO_L19N_T3_A09_D25_VREF_14 Sch=jc9/ck_io[35]
    #set_property -dict { PACKAGE_PIN V14   IOSTANDARD LVCMOS33 } [get_ports { jc[7] }]; #IO_L20P_T3_A08_D24_14 Sch=jc10/ck_io[34]
    
    ## PMOD Header JD
    #set_property -dict { PACKAGE_PIN V15   IOSTANDARD LVCMOS33 } [get_ports { jd[0] }]; #IO_L20N_T3_A07_D23_14 Sch=jd1/ck_io[33]
    #set_property -dict { PACKAGE_PIN U12   IOSTANDARD LVCMOS33 } [get_ports { jd[1] }]; #IO_L21P_T3_DQS_14 Sch=jd2/ck_io[32]
    #set_property -dict { PACKAGE_PIN V13   IOSTANDARD LVCMOS33 } [get_ports { jd[2] }]; #IO_L21N_T3_DQS_A06_D22_14 Sch=jd3/ck_io[31]
    #set_property -dict { PACKAGE_PIN T12   IOSTANDARD LVCMOS33 } [get_ports { jd[3] }]; #IO_L22P_T3_A05_D21_14 Sch=jd4/ck_io[30]
    #set_property -dict { PACKAGE_PIN T13   IOSTANDARD LVCMOS33 } [get_ports { jd[4] }]; #IO_L22N_T3_A04_D20_14 Sch=jd7/ck_io[29]
    #set_property -dict { PACKAGE_PIN R11   IOSTANDARD LVCMOS33 } [get_ports { jd[5] }]; #IO_L23P_T3_A03_D19_14 Sch=jd8/ck_io[28]
    #set_property -dict { PACKAGE_PIN T11   IOSTANDARD LVCMOS33 } [get_ports { jd[6] }]; #IO_L23N_T3_A02_D18_14 Sch=jd9/ck_io[27]
    #set_property -dict { PACKAGE_PIN U11   IOSTANDARD LVCMOS33 } [get_ports { jd[7] }]; #IO_L24P_T3_A01_D17_14 Sch=jd10/ck_io[26]
    
    ## USB-UART Interface
    #set_property -dict { PACKAGE_PIN R12   IOSTANDARD LVCMOS33 } [get_ports { uart_rxd_out }]; #IO_25_14 Sch=uart_rxd_out
    #set_property -dict { PACKAGE_PIN V12   IOSTANDARD LVCMOS33 } [get_ports { uart_txd_in }]; #IO_L24N_T3_A00_D16_14 Sch=uart_txd_in
    ## ChipKit Outer Digital Header
    #set_property -dict { PACKAGE_PIN L13   IOSTANDARD LVCMOS33 } [get_ports { ck_io0 }]; #IO_0_14 Sch=ck_io[0]
    #set_property -dict { PACKAGE_PIN N13   IOSTANDARD LVCMOS33 } [get_ports { ck_io1 }]; #IO_L6N_T0_D08_VREF_14   Sch=ck_io[1]
    #set_property -dict { PACKAGE_PIN L16   IOSTANDARD LVCMOS33 } [get_ports { ck_io2 }]; #IO_L3N_T0_DQS_EMCCLK_14 Sch=ck_io[2]
    #set_property -dict { PACKAGE_PIN R14   IOSTANDARD LVCMOS33 } [get_ports { ck_io3 }]; #IO_L13P_T2_MRCC_14      Sch=ck_io[3]
    #set_property -dict { PACKAGE_PIN T14   IOSTANDARD LVCMOS33 } [get_ports { ck_io4 }]; #IO_L13N_T2_MRCC_14      Sch=ck_io[4]
    #set_property -dict { PACKAGE_PIN R16   IOSTANDARD LVCMOS33 } [get_ports { ck_io5 }]; #IO_L14P_T2_SRCC_14      Sch=ck_io[5]
    #set_property -dict { PACKAGE_PIN R17   IOSTANDARD LVCMOS33 } [get_ports { ck_io6 }]; #IO_L14N_T2_SRCC_14      Sch=ck_io[6]
    #set_property -dict { PACKAGE_PIN V17   IOSTANDARD LVCMOS33 } [get_ports { ck_io7 }]; #IO_L16N_T2_A15_D31_14   Sch=ck_io[7]
    #set_property -dict { PACKAGE_PIN R15   IOSTANDARD LVCMOS33 } [get_ports { ck_io8 }]; #IO_L17P_T2_A14_D30_14   Sch=ck_io[8]
    #set_property -dict { PACKAGE_PIN T15   IOSTANDARD LVCMOS33 } [get_ports { ck_io9 }]; #IO_L17N_T2_A13_D29_14   Sch=ck_io[9]
    
    ## ChipKit SPI Header
    ## NOTE: The ChipKit SPI header ports can also be used as digital I/O and share FPGA pins with ck_io10-13. Do not use both at the same time.
    #set_property -dict { PACKAGE_PIN H16   IOSTANDARD LVCMOS33 } [get_ports { ck_io10_ss   }]; #IO_L22P_T3_A17_15   Sch=ck_io10_ss
    #set_property -dict { PACKAGE_PIN H17   IOSTANDARD LVCMOS33 } [get_ports { ck_io11_mosi }]; #IO_L22N_T3_A16_15   Sch=ck_io11_mosi
    #set_property -dict { PACKAGE_PIN K14   IOSTANDARD LVCMOS33 } [get_ports { ck_io12_miso }]; #IO_L23P_T3_FOE_B_15 Sch=ck_io12_miso
    #set_property -dict { PACKAGE_PIN G16   IOSTANDARD LVCMOS33 } [get_ports { ck_io13_sck  }]; #IO_L14P_T2_SRCC_15  Sch=ck_io13_sck
    
    ## ChipKit Inner Digital Header
    ## NOTE: these pins are shared with PMOD Headers JC and JD and cannot be used at the same time as the applicable PMOD interface(s)
    #set_property -dict { PACKAGE_PIN U11   IOSTANDARD LVCMOS33 } [get_ports { ck_io26 }]; #IO_L24P_T3_A01_D17_14        Sch=jd10/ck_io[26]
    #set_property -dict { PACKAGE_PIN T11   IOSTANDARD LVCMOS33 } [get_ports { ck_io27 }]; #IO_L23N_T3_A02_D18_14        Sch=jd9/ck_io[27]
    #set_property -dict { PACKAGE_PIN R11   IOSTANDARD LVCMOS33 } [get_ports { ck_io28 }]; #IO_L23P_T3_A03_D19_14        Sch=jd8/ck_io[28]
    #set_property -dict { PACKAGE_PIN T13   IOSTANDARD LVCMOS33 } [get_ports { ck_io29 }]; #IO_L22N_T3_A04_D20_14        Sch=jd7/ck_io[29]
    #set_property -dict { PACKAGE_PIN T12   IOSTANDARD LVCMOS33 } [get_ports { ck_io30 }]; #IO_L22P_T3_A05_D21_14        Sch=jd4/ck_io[30]
    #set_property -dict { PACKAGE_PIN V13   IOSTANDARD LVCMOS33 } [get_ports { ck_io31 }]; #IO_L21N_T3_DQS_A06_D22_14    Sch=jd3/ck_io[31]
    #set_property -dict { PACKAGE_PIN U12   IOSTANDARD LVCMOS33 } [get_ports { ck_io32 }]; #IO_L21P_T3_DQS_14            Sch=jd2/ck_io[32]
    #set_property -dict { PACKAGE_PIN V15   IOSTANDARD LVCMOS33 } [get_ports { ck_io33 }]; #IO_L20N_T3_A07_D23_14        Sch=jd1/ck_io[33]
    #set_property -dict { PACKAGE_PIN V14   IOSTANDARD LVCMOS33 } [get_ports { ck_io34 }]; #IO_L20P_T3_A08_D24_14        Sch=jc10/ck_io[34]
    #set_property -dict { PACKAGE_PIN R13   IOSTANDARD LVCMOS33 } [get_ports { ck_io35 }]; #IO_L19N_T3_A09_D25_VREF_14   Sch=jc9/ck_io[35]
    #set_property -dict { PACKAGE_PIN P13   IOSTANDARD LVCMOS33 } [get_ports { ck_io36 }]; #IO_L19P_T3_A10_D26_14        Sch=jc8/ck_io[36]
    #set_property -dict { PACKAGE_PIN U16   IOSTANDARD LVCMOS33 } [get_ports { ck_io37 }]; #IO_L16P_T2_CSI_B_14          Sch=jc7/ck_io[37]
    #set_property -dict { PACKAGE_PIN U18   IOSTANDARD LVCMOS33 } [get_ports { ck_io38 }]; #IO_L15N_T2_DQS_DOUT_CSO_B_14 Sch=jc4/ck_io[38]
    #set_property -dict { PACKAGE_PIN U17   IOSTANDARD LVCMOS33 } [get_ports { ck_io39 }]; #IO_L15P_T2_DQS_RDWR_B_14     Sch=jc3/ck_io[39]
    #set_property -dict { PACKAGE_PIN V16   IOSTANDARD LVCMOS33 } [get_ports { ck_io40 }]; #IO_L18N_T2_A11_D27_14        Sch=jc2/ck_io[40]
    #set_property -dict { PACKAGE_PIN U15   IOSTANDARD LVCMOS33 } [get_ports { ck_io41 }]; #IO_L18P_T2_A12_D28_14        Sch=jc1/ck_io[41]
    
    ## Dedicated Analog Inputs
    #set_property -dict { PACKAGE_PIN J10   } [get_ports { vp_in }]; #IO_L1P_T0_AD4P_35 Sch=v_p
    #set_property -dict { PACKAGE_PIN K9    } [get_ports { vn_in }]; #IO_L1N_T0_AD4N_35 Sch=v_n
    
    ## ChipKit Outer Analog Header - as Single-Ended Analog Inputs
    ## NOTE: These ports can be used as single-ended analog inputs with voltages from 0-3.3V (ChipKit analog pins A0-A5) or as digital I/O.
    ## WARNING: Do not use both sets of constraints at the same time!
    ## NOTE: The following constraints should be used with the XADC IP core when using these ports as analog inputs.
    set_property -dict { PACKAGE_PIN B13   IOSTANDARD LVCMOS33 } [get_ports { vauxp0  }]; #IO_L1P_T0_AD0P_15    Sch=ck_an_p[0]   ChipKit pin=A0
    set_property -dict { PACKAGE_PIN A13   IOSTANDARD LVCMOS33 } [get_ports { vauxn0  }]; #IO_L1N_T0_AD0N_15    Sch=ck_an_n[0]   ChipKit pin=A0
    #set_property -dict { PACKAGE_PIN B15   IOSTANDARD LVCMOS33 } [get_ports { vaux1_p }]; #IO_L3P_T0_DQS_AD1P_15 Sch=ck_an_p[1]   ChipKit pin=A1
    #set_property -dict { PACKAGE_PIN A15   IOSTANDARD LVCMOS33 } [get_ports { vaux1_n }]; #IO_L3N_T0_DQS_AD1N_15 Sch=ck_an_n[1]   ChipKit pin=A1
    #set_property -dict { PACKAGE_PIN E12   IOSTANDARD LVCMOS33 } [get_ports { vaux9_p }]; #IO_L5P_T0_AD9P_15     Sch=ck_an_p[2]   ChipKit pin=A2
    #set_property -dict { PACKAGE_PIN D12   IOSTANDARD LVCMOS33 } [get_ports { vaux9_n }]; #IO_L5N_T0_AD9N_15     Sch=ck_an_n[2]   ChipKit pin=A2
    #set_property -dict { PACKAGE_PIN B17   IOSTANDARD LVCMOS33 } [get_ports { vaux2_p }]; #IO_L7P_T1_AD2P_15     Sch=ck_an_p[3]   ChipKit pin=A3
    #set_property -dict { PACKAGE_PIN A17   IOSTANDARD LVCMOS33 } [get_ports { vaux2_n }]; #IO_L7N_T1_AD2N_15     Sch=ck_an_n[3]   ChipKit pin=A3
    #set_property -dict { PACKAGE_PIN C17   IOSTANDARD LVCMOS33 } [get_ports { vaux10_p }]; #IO_L8P_T1_AD10P_15   Sch=ck_an_p[4]   ChipKit pin=A4
    #set_property -dict { PACKAGE_PIN B18   IOSTANDARD LVCMOS33 } [get_ports { vaux10_n }]; #IO_L8N_T1_AD10N_15   Sch=ck_an_n[4]   ChipKit pin=A4
    #set_property -dict { PACKAGE_PIN E16   IOSTANDARD LVCMOS33 } [get_ports { vaux11_p }]; #IO_L10P_T1_AD11P_15  Sch=ck_an_p[5]   ChipKit pin=A5
    #set_property -dict { PACKAGE_PIN E17   IOSTANDARD LVCMOS33 } [get_ports { vaux11_n }]; #IO_L10N_T1_AD11N_15  Sch=ck_an_n[5]   ChipKit pin=A5
    ## ChipKit Outer Analog Header - as Digital I/O
    ## NOTE: The following constraints should be used when using these ports as digital I/O.
    #set_property -dict { PACKAGE_PIN G13   IOSTANDARD LVCMOS33 } [get_ports { ck_a0 }]; #IO_0_15            Sch=ck_a[0]
    #set_property -dict { PACKAGE_PIN B16   IOSTANDARD LVCMOS33 } [get_ports { ck_a1 }]; #IO_L4P_T0_15       Sch=ck_a[1]
    #set_property -dict { PACKAGE_PIN A16   IOSTANDARD LVCMOS33 } [get_ports { ck_a2 }]; #IO_L4N_T0_15       Sch=ck_a[2]
    #set_property -dict { PACKAGE_PIN C13   IOSTANDARD LVCMOS33 } [get_ports { ck_a3 }]; #IO_L6P_T0_15       Sch=ck_a[3]
    #set_property -dict { PACKAGE_PIN C14   IOSTANDARD LVCMOS33 } [get_ports { ck_a4 }]; #IO_L6N_T0_VREF_15  Sch=ck_a[4]
    #set_property -dict { PACKAGE_PIN D18   IOSTANDARD LVCMOS33 } [get_ports { ck_a5 }]; #IO_L11P_T1_SRCC_15 Sch=ck_a[5]
    
    ## ChipKit Inner Analog Header - as Differential Analog Inputs
    ## NOTE: These ports can be used as differential analog inputs with voltages from 0-1.0V (ChipKit analog pins A6-A11) or as digital I/O.
    ## WARNING: Do not use both sets of constraints at the same time!
    ## NOTE: The following constraints should be used with the XADC core when using these ports as analog inputs.
    #set_property -dict { PACKAGE_PIN B14   IOSTANDARD LVCMOS33 } [get_ports { vaux8_p }]; #IO_L2P_T0_AD8P_15     Sch=ad_p[8]    ChipKit pin=A5
    #set_property -dict { PACKAGE_PIN A14   IOSTANDARD LVCMOS33 } [get_ports { vaux8_p }]; #IO_L2N_T0_AD8N_15     Sch=ad_n[8]    ChipKit pin=A6
    #set_property -dict { PACKAGE_PIN D16   IOSTANDARD LVCMOS33 } [get_ports { vaux3_n }]; #IO_L9P_T1_DQS_AD3P_15 Sch=ad_p[3]    ChipKit pin=A7
    #set_property -dict { PACKAGE_PIN D17   IOSTANDARD LVCMOS33 } [get_ports { vaux3_n }]; #IO_L9N_T1_DQS_AD3N_15 Sch=ad_n[3]    ChipKit pin=A8
    ## ChipKit Inner Analog Header - as Digital I/O
    ## NOTE: The following constraints should be used when using the inner analog header ports as digital I/O.
    #set_property -dict { PACKAGE_PIN B14   IOSTANDARD LVCMOS33 } [get_ports { ck_a6  }]; #IO_L2P_T0_AD8P_15     Sch=ad_p[8]
    #set_property -dict { PACKAGE_PIN A14   IOSTANDARD LVCMOS33 } [get_ports { ck_a7  }]; #IO_L2N_T0_AD8N_15     Sch=ad_n[8]
    #set_property -dict { PACKAGE_PIN D16   IOSTANDARD LVCMOS33 } [get_ports { ck_a8  }]; #IO_L9P_T1_DQS_AD3P_15 Sch=ad_p[3]
    #set_property -dict { PACKAGE_PIN D17   IOSTANDARD LVCMOS33 } [get_ports { ck_a9  }]; #IO_L9N_T1_DQS_AD3N_15 Sch=ad_n[3]
    #set_property -dict { PACKAGE_PIN D14   IOSTANDARD LVCMOS33 } [get_ports { ck_a10 }]; #IO_L12P_T1_MRCC_15    Sch=ck_a10_r   (Cannot be used as an analog input)
    #set_property -dict { PACKAGE_PIN D15   IOSTANDARD LVCMOS33 } [get_ports { ck_a11 }]; #IO_L12N_T1_MRCC_15    Sch=ck_a11_r   (Cannot be used as an analog input)
    
    ## ChipKit I2C
    #set_property -dict { PACKAGE_PIN J14   IOSTANDARD LVCMOS33 } [get_ports { ck_scl }]; #IO_L24N_T3_RS0_15 Sch=ck_scl
    #set_property -dict { PACKAGE_PIN J13   IOSTANDARD LVCMOS33 } [get_ports { ck_sda }]; #IO_L24P_T3_RS1_15 Sch=ck_sda
    
    ## Misc. ChipKit Ports
    #set_property -dict { PACKAGE_PIN K13   IOSTANDARD LVCMOS33 } [get_ports { ck_ioa }]; #IO_25_15 Sch=ck_ioa
    #set_property -dict { PACKAGE_PIN C18   IOSTANDARD LVCMOS33 } [get_ports { ck_rst }]; #IO_L11N_T1_SRCC_15
    
    ## Quad SPI Flash
    ## Note: the SCK clock signal can be driven using the STARTUPE2 primitive
    #set_property -dict { PACKAGE_PIN M13   IOSTANDARD LVCMOS33 } [get_ports { qspi_cs }]; #IO_L6P_T0_FCS_B_14 Sch=qspi_cs
    #set_property -dict { PACKAGE_PIN K17   IOSTANDARD LVCMOS33 } [get_ports { qspi_dq[0] }]; #IO_L1P_T0_D00_MOSI_14 Sch=qspi_dq[0]
    #set_property -dict { PACKAGE_PIN K18   IOSTANDARD LVCMOS33 } [get_ports { qspi_dq[1] }]; #IO_L1N_T0_D01_DIN_14 Sch=qspi_dq[1]
    #set_property -dict { PACKAGE_PIN L14   IOSTANDARD LVCMOS33 } [get_ports { qspi_dq[2] }]; #IO_L2P_T0_D02_14 Sch=qspi_dq[2]
    #set_property -dict { PACKAGE_PIN M15   IOSTANDARD LVCMOS33 } [get_ports { qspi_dq[3] }]; #IO_L2N_T0_D03_14 Sch=qspi_dq[3]
    
    ## Configuration options, can be used for all designs
    set_property BITSTREAM.CONFIG.CONFIGRATE 50 [current_design]
    set_property CONFIG_VOLTAGE 3.3 [current_design]
    set_property CFGBVS VCCO [current_design]
    set_property BITSTREAM.CONFIG.SPI_BUSWIDTH 4 [current_design]
    set_property CONFIG_MODE SPIx4 [current_design]
    
    ## SW3 is assigned to a pin M5 in the 1.35v bank. This pin can also be used as
    ## the VREF for BANK 34. To ensure that SW3 does not define the reference voltage
    ## and to be able to use this pin as an ordinary I/O the following property must
    ## be set to enable an internal VREF for BANK 34. Since a 1.35v supply is being
    ## used the internal reference is set to half that value (i.e. 0.675v). Note that
    ## this property must be set even if SW3 is not used in the design.
    set_property INTERNAL_VREF 0.675 [get_iobanks 34]

     

    Then I used a XADC Wizard from IP Catalog to create module for ADC.

    xadc2

    I have configured it to use single channel and event timming mode. XADC will by triggered by 200 Hz signal received from prescaler from main clock.

    xadc3

    I have disabled all alarms because I do not use it in this project. It is nice that we have these options included in the ADC module, it could be useful in some projects.

    xadc4

    Then I configured channel 0 which will be used for sampling data.

    xadc5

    At the end we are getting module which we could use in our main design. I really like idea of IP catalog modules. It save a lot of time. We are able to use verified and tested components. Here is listing of code for prescaler used to trigger ADC.

    `timescale 1ns / 1ps
    //////////////////////////////////////////////////////////////////////////////////
    // Company: 
    // Engineer: kk99
    // 
    // Create Date: 05.09.2018 17:53:53
    // Design Name: 
    // Module Name: prescaler
    // Project Name: 
    // Target Devices: 
    // Tool Versions: 
    // Description: Generates 200 Hz clock from 100 MHz source
    // 
    // Dependencies: 
    // 
    // Revision:
    // Revision 0.01 - File Created
    // Additional Comments:
    // 
    //////////////////////////////////////////////////////////////////////////////////
    
    
    module prescaler(
        input clk100MHz,
        output reg clk200Hz
        );
        
        reg [17:0] countReg = 0;
        always @(posedge clk100MHz) begin
            if (countReg < 249999) begin
                countReg <= countReg + 1;
            end else begin
                countReg <= 0;
                clk200Hz <= ~clk200Hz;
            end
        end
    endmodule

     

    Here is main design listing:

    `timescale 1ns / 1ps
    //////////////////////////////////////////////////////////////////////////////////
    // Company: 
    // Engineer: 
    // 
    // Create Date: 05.09.2018 18:23:13
    // Design Name: 
    // Module Name: topLevel
    // Project Name: 
    // Target Devices: 
    // Tool Versions: 
    // Description: 
    // 
    // Dependencies: 
    // 
    // Revision:
    // Revision 0.01 - File Created
    // Additional Comments:
    // 
    //////////////////////////////////////////////////////////////////////////////////
    
    
    module topLevel(
        input CLK100MHZ,
        input vauxp0,
        input vauxn0,
        output led2
        );
        
        wire clk200Hz;
        prescaler scaler
        (
        .clk100MHz(CLK100MHZ),
        .clk200Hz(clk200Hz)
        );
        
        wire enable;
        wire ready;
        wire [15:0] data;
        
        xadc_wiz_0 adc
        (
        .convstclk_in(clk200Hz),        // Convert Start Input Clock
        .daddr_in(8'h10),               // Address bus for the dynamic reconfiguration port
        .dclk_in(CLK100MHZ),            // Clock input for the dynamic reconfiguration port
        .den_in(enable),                // Enable Signal for the dynamic reconfiguration port
        .di_in(0),                      // Input data bus for the dynamic reconfiguration port
        .dwe_in(0),                     // Write Enable for the dynamic reconfiguration port
        .reset_in(0),                   // Reset signal for the System Monitor control logic
        .vauxp0(vauxp0),                // Auxiliary channel 0
        .vauxn0(vauxn0),
        .busy_out(),                    // ADC Busy signal
        .channel_out(),                 // Channel Selection Outputs
        .do_out(data),                  // Output data bus for dynamic reconfiguration port
        .drdy_out(ready),               // Data ready signal for the dynamic reconfiguration port
        .eoc_out(enable),               // End of Conversion Signal
        .eos_out(),                     // End of Sequence Signal
        .alarm_out(),                   // OR'ed output of all the Alarms    
        .vp_in(0),                      // Dedicated Analog Input Pair
        .vn_in(0)
        );
        
        reg [11:0] dataADC;
        always @(posedge CLK100MHZ)
            begin
                dataADC <= data[15:4];
            end
        
        wire [11:0] out;
        Sampler_topEntity sampler
        (
        .input_0(dataADC),
        .system1000(CLK100MHZ),
        .system1000_rstn(1),
        .output_0(out)
        );
        
        reg value;
        led led_2
        (
        .clk100MHz(CLK100MHZ),
        .value(value),
        .led(led2)
        );
            
        always @(posedge CLK100MHZ)
            begin
                if (out > 500)
                    begin
                        value <= 1'b1;
                    end else
                    begin
                        value <= 1'b0;
                    end
            end
    endmodule

     

    ADC data is connected to sampler module which is implementation of PT algorithm. Output from this module drives LED2.
    Here is RTL design:
    design

    The code for sampler I have downloaded from this repository: pantompkins-clash. The sources are written in CLaSH HDL. You could easily generate Verilog sources with following command:

    cd src
    clash --verilog  Sampler.hs

    Here is photo of whole system and short video from test.
    board

    5. Summary

    We have Spartan-7 xc7s50 on board, Pmods interfaces, 256MB RAM, 16MB Flash, leds, buttons and switches all these elements gives great enviroment to development. MicroBlaze soft processor and IP cores with connection with (Pmods/Arduino shields) gives a maker additional way of development.  The board is very small and portable, so you could use it in any place. You could use it for testing purposes in field. In connection with Vivado it gives good development toolset. Of course firstly you need to learn this software but thanks to good tutorials on the producer site it is quite fast. In this moment I see that I would like to continue to learn Verilog language to create more complex projects. I hope that soon I could make new project with usage of this board.


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