add expired patent

diff --git a/simple_v_extension.mdwn b/simple_v_extension.mdwn
index 1f479badad0209ee49ebd85864e2376ee9613fb4..6599f930bf7f6aa597e8405b61cc967fecb381b7 100644 (file)
--- a/simple_v_extension.mdwn
+++ b/simple_v_extension.mdwn
@@ -477,6 +477,8 @@ In Section 12.3 riscv-isa manual V2.3-draft it is noted the comments on
 page 76, "For virtual memory systems some data accesses could be resident
 in physical memory and some not".  The interesting question then arises:
 how does RVV deal with the exact same scenario?
+Expired U.S. Patent 5895501 (Filing Date Sep 3 1996) describes a method
+of detecting early page / segmentation faults.
 
 # Note on implementation of parallelism
 
@@ -1338,3 +1340,5 @@ by *introducing* deliberate latency into the execution phase.
 * Multi-ported VLIW Register File Implementation <https://ce-publications.et.tudelft.nl/publications/1517_multiple_contexts_in_a_multiported_vliw_register_file_impl.pdf>
 * Fast context save/restore proposal <https://groups.google.com/a/groups.riscv.org/d/msgid/isa-dev/57F823FA.6030701%40gmail.com>
 * Register File Bank Cacheing <https://www.princeton.edu/~rblee/ELE572Papers/MultiBankRegFile_ISCA2000.pdf>
+* Expired Patent on Vector Virtual Memory solutions
+  <https://patentimages.storage.googleapis.com/fc/f6/e2/2cbee92fcd8743/US5895501.pdf?