3 ms·
It wasn't clear to me that they had implemented a page table (I think that's the S extensions?) which I would think would make the I/O space much more complex a
by granthamb 3y ago
It wasn't clear to me that they had implemented a page table (I think that's the S extensions?) which I would think would make the I/O space much more complex and difficult to represent. Lack of VA translation would make this CPU much less comparable to a 486SX.
- thesz 3y agoThey implemented basic ISA. No virtual memory extensions were implemented. They compared performance of 80486 with their tapeout at 65nm (20 years of technology betterment). Judging from this, I suspect they may introduced long delays into some of the circuitry. They also "cleverly" avoided exponential blow up of any BDD representation by not implementing any multiplier or divider. Their ISA is RISC-V32IA, which does not include multipler.