Does anyone have a very simple PD core written in VHDL
for a recent Vivado project implementation?

I'm just looking for something very simple I can
just load up and experiment with.
(I dont want to use the proprietry cores)

I dont need much in the way of I/O if anything at all.

The older ISE based ones here have too many issues when I
try to convert them (I'm still learning) and I'm never quite
sure if it's me or the conversion when things dont work.

TIA

Hi @jazz2017,
Not sure exactly what you're looking to do but if it's simulating and understanding processor design, the Picoblaze open source mcu might be good start.
https://en.wikipedia.org/wiki/PicoBlaze

It's an old Xilinx-developed core (device and IDE agnostic) so there should be plenty of information and examples regarding that core.

Have fun,
Jerry