Picoengine Processor Tripwire Bus Port Debugging
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Solution Overview
Problem
Current processor architectures require substantial integrated circuit area for instruction counters and associated control circuitry, limiting the miniaturization of processors, and lack efficient mechanisms for debugging and monitoring of network packet processing operations.
Innovation Solution
The picoengine processor, which executes tripwire instructions and communicates tripwire values through a tripwire bus, utilizes a novel architecture without an instruction counter, incorporating a tripwire bus port for outputting multi-bit values and a picoengine number, and a Tripwire Data Merging and Collision Detection Circuit to consolidate and debug these values across a pool of processors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional processor architectures with instruction counters and control circuitry are used, then processing functionality is achieved, but integrated circuit area increases
Solution Approach 1:
The patent removes the instruction counter and associated control circuitry from the processor architecture. The picoengine processor executes instructions by fetching them sequentially from memory without requiring an instruction counter to track the program counter, thereby eliminating substantial control circuitry and reducing integrated circuit area while maintaining processing functionality
Solution Approach 2:
The tripwire bus port serves multiple functions: it outputs debug information from individual picoengines, consolidates data from multiple processors through the TDMCDC circuit, and enables both monitoring and debugging operations through a single interface, replacing what would traditionally require separate dedicated circuits
2Area of stationary object
If processor size is reduced for miniaturization, then integrated circuit area decreases, but debugging and monitoring capability deteriorates
Solution Approach 1:
The TDMCDC circuit acts as an intermediary between multiple miniaturized picoengines and the external debug station. It consolidates tripwire values from multiple processors onto a single bus, enabling effective debugging and monitoring of network packet processing even though individual processors are highly miniaturized
Solution Approach 2:
The tripwire instruction and bus port create a feedback mechanism where processors output their internal state (register values, flags, pointers) for external observation. This allows real-time monitoring of processor operation and detection of processing anomalies without increasing processor size
3Difficulty of detecting and measuring
If traditional debug mechanisms are implemented, then debugging capability is provided, but power consumption increases
Solution Approach 1:
The tripwire bus outputs data synchronously on a periodic clock basis rather than continuously. The TDMCDC circuit consolidates data at specific clock cycles, enabling debugging capability while reducing power consumption compared to continuous data output mechanisms used in traditional architectures
Data Source
AI summary
A pipelined run-to-completion processor has a special tripwire bus port and executes a novel tripwire instruction. Execution of the tripwire instruction causes the processor to output a tripwire value onto the port during a clock cycle when the tripwire instruction is being executed. A first multi-bit value of the tripwire value is data that is output from registers, and/or flags, and/or pointers, and/or data values stored in the pipeline. A field of the tripwire instruction specifies what particular stored values will be output as the first multi-bit value. A second multi-bit value of the tripwire value is a number that identifies the particular processor that output the tripwire value. The processor has a TE enable/disable control bit. This bit is programmable by a special instruction to disable all tripwire instructions. If disabled, a tripwire instruction is fetched and decoded but does not cause the output of a tripwire value.