Hi,If it is only ARM Chip then knowledge of Debug arch is more than enough.. If you are talking from SoC point of view.. were you may hv zero, one or more other processor.. then you will need a special controller which uses Test Scan Cain to reach to all the programmable registers or processors debug ports in serial or parallel mannar. This is typically called ICE. This ICE is connected to JTAG. JTAG is a way to connect this SoC to outside world to the ARM/ARM Based SoC. In production devices typically this ICE is dissabled(using fuse) so that there will not be any 'insight' to outside world. Regards,Kedar Kulkarni[font="Verdana"][color="#FF8C00"]One day all digial world will be in my ARMs[/color].[/font]
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