control bus

from The Free On-line Dictionary of Computing (8 July 2008)

control bus

   <architecture> In a {digital computer}, the signal paths that
   carry commands from the {instruction decode} logic to various
   different functional units such as the {ALU}, {memory address
   register}, {memory data register} and other {buffers}.

   Named by analogy with the {address bus} and {data bus}, each
   of which carries a set of related signals, the signals carried
   by the control bus are more independant.

   Some might include other signals such as timing ({clock}) and
   status under the term, further reducing its similarity to
   other busses.

   (2007-07-25)