Comment by nsteel

It's similar to RAID schemes but instead of drive failure it's port unavailability. There's a reference at [1] or an FPGA-centric one at [2], but it applies to anywhere where dual/single-port rams are readily available but anything more exotic isn't.

  [1] Achieving Multi-Port Memory Performance on Single-Port Memory with Coding Techniques - https://arxiv.org/abs/2001.09599
  [2] https://people.csail.mit.edu/ml/pubs/fpga12_xor.pdf