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Nowadays many powerful public domain IP cores are available for complicated component like 32 bit processor i.e. LEON3. It needs considerable expertise and pain taking experimentation to implement a hardware/software co-design project. This paper presents step-by-step description for AES algorithm implementation on LEON3 processor. This will prove to be valuable to researchers working in this area and save their valuable time. The concept of GPIO (General Purpose I/O Port) is introduced; through which any custom hardware i.e. own designed hardware or IP core can be interfaced with the open source processor.
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