Adding README_tag.md

README_tag.md

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+Description: This tag is the latest attempt at converting the BlackParrot Back End into a bitserial
+processor. Dan Petrisko thinks that this is a good idea based on no architectural analysis, but
+instead because it is fun. 
+
+Latest update: This was attempted over a weekend during EE477 at UW. It successfully achieved
+bitserial execution, but had problems with control flow.
+
+Problems preventing integration: Bitserial control flow is complicated enough that this is a
+non-trivial task to debug. For instance, it is very difficult to detect what happens when an
+instruction commits because the update comes over 64 cycles.
+
+Next tasks: Complete the implementation, do some analysis to see if this is worth it at all. One
+benefit would be that it will demonstrate how modular BlackParrot is (look at this crazily different
+component switch-out!)
+
+Additional info:
+https://docs.google.com/presentation/d/15P8n1oprgaNuFO3OiGN_Z9prKWLTlf5Y5ZaWbcdUOtQ/edit 
+