Within a system-on-chip device 2 having multiple processing circuits 4, 6, 8, one processing circuit 4 may serve to perform diagnostic operations upon another processing circuit 8 by accessing diagnostic data relating to that other circuit. Thus, one processor may, for example, control and perform halting mode type diagnostic or code profiling upon another.

 
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> Optical signal converter and method of controlling amplification gain according to rotating speed of optical disc

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