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MPC553x, MPC555x and MPC556x family Nexus interface connector

Posted: 28 Apr 2010 ?? ?Print Version ?Bookmark and Share

Keywords:interface connector? Nexus standard? MPC553x connectors?

The IEEE-ISTO 5001-2003 Nexus standard (referred to as the Nexus standard) interface is an industry standard that crosses CPU boundaries and allows industry-standard tools to support multiple CPU architectures. It allows advanced debug capabilities by providing high-speed access to the microcontroller core.

These advanced debug capabilities include trace, without requiring extensive external circuitry to monitor an external address bus. The Nexus standard defines a minimum feature set that must be implemented. To simplify discussion of debug capabilities between different requirements/capabilities, the minimum feature set requirements are divided into four classes.
? Nexus Class 1 defines basic run control capabilities that must be implemented.
? A Nexus-compliant Class 2 or greater device allows non-intrusive instruction and ownership trace on a microcontroller in single-chip mode or a microcontroller without external data and address buses.
? A Nexus Class 3 or greater device also allows for data trace and read/write access to memory while the microcontroller is running.
? Class 4 supports some advanced debug capabilities, but Freescale currently has implemented only a few Class 4 features and does not support all of them. Therefore, there are no devices or cores that support the full Class 4 requirements.

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