Yeah, the AM2900 series is fascinating, the devices themselves are totally unavailable, which is fine, fpgas are cheap and ubiquitous. It would be a great project to reimplment the parts in an HDL!

https://en.wikipedia.org/wiki/AMD_Am2900#Members_of_the_Am29...

There are two other branches of system design which are really interesting

    * CGRAs, Course Grain Reconfigurable Architecture [1]
    * FPGA Overlays [2]

[1] https://cgra-me.ece.utoronto.ca/

[2] https://ieeexplore.ieee.org/abstract/document/6239797 https://www.seekdl.org/conferences/paper/details/9227 https://www.semanticscholar.org/paper/An-efficient-FPGA-over...