Timeline for Why are CPUs' datapaths multiple of 8?
Current License: CC BY-SA 3.0
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| Apr 30, 2017 at 8:25 | comment | added | Derek Elkins left SE | Concretely, PAE (Physical Address Extension) which provided support for accessing >4GB on a 32-bit processor didn't expose a flat address space. Instead, to access the full 64GB required switching page tables as needed. The actual entries in the page tables were 64-bit where initially only 4 of those extra 32-bits were used to extend the 20-bit page address (+12 bit offset = 36-bits). | |
| Apr 29, 2017 at 21:03 | history | answered | Erik Eidt | CC BY-SA 3.0 |