Aspects of a method and system for blocking data in scan registers from
being shifted out of a device may comprise preventing data intrusion in
an integrated circuit by generating a device reset signal prior to
entering scan mode. The method may further comprise detecting an attempt
to enter said scan mode. The device reset signal may also be an internal
reset signal. A subsequent device reset signal may be generated after
entering scan mode. The subsequent device reset signal may be an internal
pulse signal. The method may further comprise clearing stored data in an
integrated circuit after generating a subsequent device reset signal.