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Posts posted by CleverDigitalGuy

  1. I have 3 CMOD A7's, and I had no trouble on my old Lenovo box, no matter what cable I used.  I moved to a new high-end HP Zbook, and my CMOD A7's were unstable--kept connecting and disconnecting from the hardware manager, in and endless loop.  I was using a garden-grade USB cable.  After reading this blog, I switched to a short (18 inch), very high end USB cable, and the problem went away.  So, it would appear that the cable is a factor, but the USB PHY on the PC may also play into this problem (which is why some people might experience a different result with the same cables, etc.)

  2. On 1/20/2018 at 1:08 AM, xc6lx45 said:

    If you have doubts about your current license, it might be the easiest route to simply build a test design and see what happens.
    Personally, I suspect that tool vendors make a great deal of money from uneducated users and are reluctant to change that.

    This as constraint file

    set_property -dict {PACKAGE_PIN L17 IOSTANDARD LVCMOS33} [get_ports CLK12]
    set_property -dict {PACKAGE_PIN A17 IOSTANDARD LVCMOS33} [get_ports {LED}]


    module top(input wire CLK12, output reg LED);
    always @(posedge CLK12)
    LED <= LED + 1'b1;

    should do the trick. Choose xc7a35tcpg236-1 under Vivado "project settings".

    I bought a CMOD A7 with Artix-7 35T and checked it out.  I installed my custom UART module and checked it out on my node locked, device locked Vivado license (that came with the Arty 35 board).  Works great :)

  3. 3 hours ago, zygot said:

    Xilinx has a product brochure that specifies what devices are supported by the free version of Vivado ( they don't make it easy to find it ). This is the sure way to determine if your board will work. Digilent generally offers a voucher for boards that aren't supported by free Vivado.

    And I hate to gripe about it but why don't posters see the little blurb under the Project Vault heading that says its a place to post project code and not for asking questions? (my eyesight isn't so good so perhaps I shouldn't be the one asking this question ).

    I'm brand new to this forum, and I was very uncertain as to where to post this question.

  4. I have an Arty-35 evaluation board that came with a device-locked, node-locked Vivado license. (BTW, the board and tools are very nice). Does my limited Vivado license also cover programming the Cmod A7: Breadboardable Artix-7 FPGA Module which also uses an Artix-7 A7-35T FPGA component?  I think they're the same Artix-7 device, so it seems like it should work.  I'd like to purchase one of these Cmod A7 FPGA DIP devices, but I want to be sure my Vivado license will cover it.