This paper focus on the designation and implementation of the AT91 simulator which is part of the virtual verification module of the validation tools. First of all we study and analysis of the basic structure of AT91 microcontrollers. We study the bus system, address mapping, and boot model; and the logical of the external bus interface device, advanced interrupt controller's device. Then, based on the study and analysis of the AT91 microcontrollers, we abstract the overall structure of the AT91 microcontrollers, and design the basic structure of the bus and equipment as well as the standard interfaces.
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