Software architecture of Sony Playstation (1,2,3,4) and Microsoft Xbox (also all generations)?

Question

Books

Advise please literature on the following topic.
Interested in the features of the PS and Xb architecture - for each of the consoles, the following are of interest:

• architecture differences between console generations
  
• software-hardware communication (in each of the generations)
  
• features and principles of emulation
  

Also interested in the features of the impossibility of PS4 emulation (which is connected with the comparison of the emulation of previous generations of PS with the hypothetical emulation of the current one)

Answer 1

PS Developer Wiki
and the rest https://partners.playstation.net