* Formerly known as Test & Debug Working Group

Charter

• Enable best system debug support in all stages of the mobile equipment development focusing on the following:
  • Low cost solutions
  • Interoperability by defining standards.
  • The targeted interfaces are hardware and software interfaces interacting with or supporting system debug.
• The standardization shall supply benefits for manufacturers as well as for users. The WG will:
  • Identify the gaps in current non-MIPI and MIPI standards
  • Develop recommendations and propose solutions, which may end up in guidelines for standards as well as in interface and protocol standardizations.
• To reach the goal the WG will cooperate with other MIPI WG’s, and other industry bodies if appropriate.

Scope

The scope of Debug will be to unify/define:

• Mating connection and pin assignment for debug and test tooling
• Electrical/timing characteristics of these interfaces
• Common base protocols/carrier protocol
• A system-wide debug approach

Debug has many different efforts underway

• Standards starting from board level connectors up through software protocols
• Narrow I/F for Debug and Test (NIDnT)
• System Trace Interface
• Parallel Trace Interface
• Gigabit Trace Interface
• Debug Connectors
• Trace Wrapper Protocol
• System Trace Protocol
• Open System Trace

The Debug Working group is currently focusing on defining the protocol stack that will enable system debug over the MIPI UniPro communications protocol and the MIPI M-PHY physical interface.

History

• Spun off minimum-pin debug effort to IEEE 1149.7 (2006)
• System Trace Protocol Specification (2007)
  • Generic trace protocol optimized for efficient transport of HW and SW trace messages
• Parallel Trace Interface Specification (2007)
  • Timing and electrical specification for parallel trace interface
• Debug Connectors Recommendation (2008)
  • Connector types and pin mappings
• Open System Trace Base Protocol Specification (2009)
  • Low level protocol for SW message trace
• System Trace Protocol Specification 2.0 (2010)
  • Expands on 1.0 with increased channel/master space, better synchronization, and enhanced timestamps
• Trace Wrapper Protocol Specification (2010)
  • Defines how to merge data from multiple trace sourced into a single stream  
• Parallel Trace Interface Specification 2.0 (2010 – undergoing final tech edits)
  • Adds multi-drop trace

Roadmap

• Debug Architecture Overview (2010)
  • Overview document that pulls together all the efforts in MIPI T&D
• Narrow Interface for Debug and Trace Specification (2010/11)
  • Reuse of functional interfaces (e.g. MMC) for debug
• Gigabit Trace Data Protocol Specification (2010/11)
  • Network independent protocol for transporting trace data over high speed functional interfaces like UniPro and USB 3.0
• Gigabit Trace Network Adaptor for UniPro Specification (2011)
  • UniPro specific adaptor for Gigabit Trace Data Protocol
• Gigabit Trace Network Adaptor for USB 3.0 Specification (under consideration)
  • USB 3.0 specific adaptor for for Gigabit Trace Data Protocol
• Open System Trace Framework (2011/12)
  • A family of specification for a robust infrastructure to manage SW trace messaging between the debug target and host systems

Working Group Chair

Gary Cooper,  Texas Instruments

Working Group Vice-Chair

Jean-Francis Duret  , ST 

Contributing Companies:

ARM, Intel, Lauterbach, Nokia, Qualcomm, ST-Ericsson, ST-Microelectronics, Texas Instruments