Generally, topic of late 80, and later development is interesting, but somehow difficult to find consistent sources... and it is somehow to be explored. Plenty of information can be found. But as there were many companies that developed own systems, it is difficult to develop somehow systematic view of that process. What can be done, quickly is to share some links. One can view them by his own.
There was mentioned a lot about Baquiette "platform" (familly of processors / Operating system) in reference https://kaf401.rloc.ru/ASORLD/Baget.pdf , including signal processor you mentioned. This reference was created in early 00... so maybe it does not contain somehow final iteration of that platform.
Generally post 80 development is connected with names such as "Baquiette"(platform), Solo (mentioned above) KOMDIV (famillly of Russian domestic processors). Those technologies from early /mid 00 - are currently used in designs developed in 00 like Su-35, Su-57 , Ka-50 , Su-34 and so on...
ELBRUS (VLSI processor familly). According to my understanding family of systems based on Elbrus-8 and later is a basis for recent platform like in Su-34M, Su-57M and so on.
Links:
KOMDIV (familly of processors, included radiation hardened)
https://www.niisi.ru/orvs.htm -many many internal links...
[URL unfurl="true"]https://www.niisi.ru/devel.htm[/URL]
[URL unfurl="true"]https://handwiki.org/wiki/Engineering:KOMDIV-32[/URL]
[URL unfurl="true"]https://dailyrumors.blogspot.com/2007/12/first-russian-mips-compatible.html[/URL]
[URL unfurl="true"]https://habr.com/ru/articles/217427/[/URL]
https://files.kpda.ru/upload/iblock/c1f/niiciran_aryashev.pdf
[URL unfurl="true"]https://it-in-industry.com/itii_papers/2019/7319itii02.pdf[/URL]
[URL unfurl="true"]https://handwiki.org/wiki/KOMDIV-64[/URL]
[URL unfurl="true"]https://iopscience.iop.org/article/10.1088/1742-6596/798/1/012010/pdf[/URL]
https://www.niisi.ru/1890ВМ6Я.pdf
https://www.niisi.ru/1890ВМ7Я.pdf
[URL unfurl="true"]https://www.niisi.ru/1890%D0%92%D0%9C8%D0%AF.pdf[/URL]
[URL unfurl="true"]https://www.niisi.ru/1890%D0%92%D0%9C9%D0%AF.pdf[/URL]
Baquiett:
https://nesmelov.com/images/portfolio/polygraphy/korund-m.pdf
Elbrus:
[URL unfurl="true"]https://files.kpda.ru/upload/iblock/ff5/senkov301018.pdf[/URL]
[URL unfurl="true"]https://files.kpda.ru/upload/iblock/56c/serdin20190424.pdf[/URL]
