1. An emulation device which enables a functional circuit to support self emulation, comprising: a serial scan testability interface having at least first, second and third scan paths, said first scan path being provided for applying digital information to the functional circuit for use in emulation of the functional circuit; a first state machine connected to said second scan path having a first state selected from among a first set of states; a second state machine connected to said said third scan path having a second state selected from among a second set of states; said emulation device performing an emulation command based on a combined first state of said first state machine and second state of said second state machine.