Patent ID: 7194401

Claim:
A configuration for in-circuit emulation of a program-controlled unit having components, the configuration comprising: a test unit for replacing, during emulation, the program-controlled unit used in normal operation of a system containing the program-controlled unit, said test unit having a first program-controlled unit and a second program-controlled unit connected to said first program-controlled unit, said first program-controlled unit containing first components emulating only some of the components of the program-controlled unit replaced by said test unit, said second program-controlled unit containing second components emulating others of the components of the program-controlled unit replaced by said test unit not emulated by said first program-controlled unit, and during emulation said first program-controlled unit executing a program normally executed by the program-controlled unit during normal operation of the system, said first program-controlled unit containing a control device for monitoring whether one of said first components of said first program-controlled unit requests access to a component not contained in said first program-controlled unit and, if the access is requested, said first program-controlled unit prompting appropriate access to an appropriate one of said second components in said second program-controlled unit.