[Oberon] Project Oberon on current 'off-the-shelf' hardware

Chris Burrows cfbsoftware at gmail.com
Wed May 26 04:38:04 CEST 2021

On Wed, May 26, 2021 at 5:21 AM Pablo Cayuela <pablo.cayuela at gmail.com> wrote:
> I have the Nexys 4 with Cell RAM, not the DDR version that was renamed A7; all 3 has the same FPGA, but the one I have did not have the same pin assignment for peripherals on the constraint file.
> I'm working in order to remap the Verilog original files from you to my board.
> If you have any suggestions I'll check here on the list or in some days I will try the forum.
> Thank you Chris for your great effort porting Oberon to these new boards.
> Prof Pablo Cayuela
> Argentina

Digilent's documentation for both these boards is as excellent as
usual which simplifies tasks like this. As far as I can see the pin
assignments for the SD Card, VGA, USB HID and USB-RS232 peripherals
are identical for both boards. The Switches, LEDs, Pushbuttons and
Pmods JB and JC are all that need to be reassigned.

I've now completed the remapping myself and will email you a
constraints (XDC) file suitable for the Nexys 4 Rev B. I do not have
that older board to test it myself so you should compare the mapping
with your attempts so far and double-check it against the schematic
before you proceed to generate a new bitstream file. You should be
able to use all of the Project Oberon Workstation Verilog files that I
provide for the Nexys A7-100T unchanged.


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