Patent ID: 6233673
Filing Date: 2001-05-15
Classification: G06F

Abstract:
An in-circuit emulator for supporting debugging of a debugged system including a CPU, the in-circuit emulator having an observing function of signals on input/output ports of said CPU, and a function of carrying out execution control of a program, said in-circuit emulator comprising:a processor probe for connecting said in-circuit emulator to the input/output ports of said CPU on a board of said debugged system;an in-circuit emulator CPU embedded in said in-circuit emulator for implementing operations equivalent to those of said CPU of said debugged system; andan in-circuit emulator controller for controlling execution processing of said in-circuit emulator CPU, wherein said in-circuit emulator CPU comprises:a CPU core that carries out processing operations equivalent to those of said CPU of said debugged system;an internal trace memory for tracing a CPU internal signal of said CPU core; anda CPU internal signal output circuit for supplying said trace memory with the CPU internal signal of said CPU core in synchronism with a clock signal.