In-circuit emulator with gatekeeper for watchdog timer

Details In-circuit emulator with gatekeeper for watchdog timer In-circuit emulator with gatekeeper for watchdog timer

2007-01-09

2007-01-09

Rodriguez, Paul (Department: 2123)

Data processing: structural design, modeling, simulation, and em

Emulation

In-circuit emulator

C703S027000, C714S028000

Reexamination Certificate

active

10004039

ABSTRACT:
A watchdog timer control using a gatekeeper in an In-Circuit Emulation system. The In-Circuit Emulation system has a microcontroller operating in lock-step synchronization with a virtual microcontroller. When a watchdog event occurs, the gatekeeper, forming a part of the virtual microcontroller, crowbars the reset line of the virtual microcontroller as well as the real microcontroller. This freezes the state of the virtual microcontroller so that debug operations can be carried out. The gatekeeper operates with its own gatekeeper clock independent of the microcontroller clock. When a watchdog event occurs, the gatekeeper clock is rerouted to the virtual microcontroller to facilitate debug operations of the virtual microcontroller.

REFERENCES:
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patent: 5911059 (1999-06-01), Profit, Jr.
patent: 6460172 (2002-10-01), Insenser Farre et al.
patent: 6618854 (2003-09-01), Mann
patent: 6922821 (2005-07-01), Nemecek
patent: 6957180 (2005-10-01), Nemecek

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