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Arty S7 rev B vs Arty S7 rev E? Somewhat confused.

javagoza

I received the Digilent Arty S7 50 rev B Board for the  7 Ways to Leave Your Spartan-6 FPGA program. See intro blog: Arty S7 50 First Power Up and Hardware-Only Blinky

According to this Digilent forum post the rev B should be released sometime in 2017 

https://forum.digilent.com/topic/22950-about-arty-s7-50-board/?do=findComment&comment=67181

Looking for the Master XDC Xilinx Synopsys Design Constraint (SDC) I've found two versions under two different Digilent repositories. The xdc for revision E is under the Master XDC files for Digilent FPGA and Zynq boards repository, while the version for rev B is under its own repository

## This file is a general .xdc for the ARTY Rev. B

https://github.com/Digilent/Arty-S7-50-base-uc/blob/master/src/constraints/Arty-S7-50-Master.xdc

## This file is a general .xdc for the Arty S7-50 Rev. E

https://github.com/Digilent/digilent-xdc/blob/master/Arty-S7-50-Master.xdc

There are differences between the two constraints files but I am not able to identify if they are just changes in the names of some ports and comments or if they are more important.

But I refer them in case someone runs into trouble using the newer file's constraints and wants to make sure it's not an old constraint he has to use.

On the reference documentation page there are links to three versions of the Arty S7 board schematics

The main changes between version B and version E seem to be the voltage regulation circuit and the DDR3 memory circuit.

I am having trouble powering the board from a battery or from a power supply. The board turns on but then it starts to smell like a burnt circuit as if there is a short circuit somewhere.

Has anyone tried to power the board from any 7V-15V external power source?

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  • I'd definately only use the XDC version that matches the screen print rev on your actual board, although they do appear very similar. A DIFF function would quickly highlight the differences. If you used the wrong XDCI believe Vivado will throw a warning up - which should never be ignored or else the firmware is configured wrong and physical damage can occur.

    On the subject of burning - did you reprogram you device prior to that ? I recall in the past you just need to connect power via USB only and the default FPGA image will flash the LEDs etc.Would be a good starter to see if the board is still functional.

  • in reply to 14rhb

    I tried DIFF and it is not as easy as it look at the first time, because they refactored many pins (so almost 70% of file is marked as different) and is really hard to check all changes.

  • in reply to misaz

    OK - DIFF is a bit difficult to read the output for non-code comparisons. The changes however show much clearer under the Github history tab.

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