+\color{red}
+Note that the 11 bit {\tt dispatch path} field is not the same width
+as the 13 bit {\tt Immediate} path field in the {\tt move} instruction,
+which in turn may not be the same width as the actual path latches in
+the switch fabric.
+
+The algorithm for expanding a path to a wider width is specific to the
+switch fabric implementation, and is not specified by this
+document.\footnote{\color{red}for the Marina experiment, the correct
+ algorithm is to sign-extend the path; the most significant bit of
+ the given path is used to fill all vacant bits of the latch} In
+particular, because the {\tt dispatch path} field is always used to
+specify a path which terminates at an instruction destination (never a
+data destination), and because instruction destinations ignore the
+signal bit, certain optimizations may be possible. \color{black}