======================
Extending bit patterns							[TOP]
======================

We already extended bit patterns in ALU project. Our instruction with Opcode 00
was extending the 4-bit field denoted by `XY` with zeros to 8 bits. This was
preserving the unsigned value, e.g for `XY` denoting `0101` we have $u(0101) =
u(00000101)$.

In other applications (e.g. an ALU that provides more opcode) we would like to
provide an instruction that extends a bit pattern such that its signed value
gets preserved.  And this is what the video is all about.


Video tutorial
==============

---- VIDEO ------------------------------
https://www.youtube.com/embed/yWglxKW_heA
-----------------------------------------


Assignment
==========
Let me know if you have a good idea for an assignment. Seriously!

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