PCIe NOP Flits for Non-Intrusive Debug Data Transport
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Solution Overview
Problem
Existing interconnect architectures in computing systems face challenges in efficiently managing high-speed data transmission and debugging complex components, particularly with the introduction of advanced protocols like PCIe 6.0, which are prone to errors and require cumbersome debugging processes that disrupt system operations.
Innovation Solution
Implementing standardized No Operation (NOP) flits for debug information transmission over PCIe links, using NOP.Debug and NOP.Vendor flits to interleave diagnostic data with functional packets, allowing real-time, non-intrusive debugging without affecting normal system operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional debugging methods using protocol analyzers and sideband interfaces are used, then debugging capability is provided, but system operation is disrupted and debugging complexity increases
Solution Approach 1:
The patent merges debugging functionality with the existing PCIe data transmission channel by utilizing NOP flits that carry debug information within the normal data path. This eliminates the need for separate sideband interfaces and protocol analyzers, allowing debugging to occur without disrupting system operations.
Solution Approach 2:
The patent introduces NOP (No Operation) flits as intermediaries that carry debug information within the existing PCIe protocol framework. These flits act as mediators between the debug information source and the debugger, enabling debug operations to proceed through the normal data transmission channel without interfering with functional packets.
2Productivity
If debug information is transmitted over PCIe links using standardized NOP flits, then debugging efficiency is improved, but protocol complexity increases
Solution Approach 1:
The patent makes the existing PCIe NOP flit structure multi-functional by enabling it to carry both traditional empty/debugging purposes and debug information transmission. This universal approach allows the same protocol element to serve multiple functions without requiring separate dedicated debug protocols.
Solution Approach 2:
The patent changes the payload parameters of NOP flits from empty or traditional debug content to structured debug information containing transaction identifiers, error codes, and diagnostic data. This parameter change enables efficient debug information transmission while maintaining compatibility with the existing NOP flit format.
3Duration of action of stationary object
If real-time debugging is implemented without affecting normal operations, then system availability is maintained, but debug information transmission capability is limited
Solution Approach 1:
The patent prepares the PCIe link to carry debug information in advance by defining standardized NOP flit formats with dedicated payload structures. This preliminary preparation ensures that when debugging is needed, debug information can be transmitted immediately without disrupting normal operations or requiring system state changes.
Solution Approach 2:
The patent segments debug information into structured payload components within NOP flits, including transaction identifiers, error codes, and diagnostic data. This segmentation allows comprehensive debug information to be transmitted through the existing PCIe channel without overwhelming the protocol or interfering with functional traffic.
Data Source
AI summary
A device includes a port to couple to another device over an interconnect, where the port includes circuitry to generate a no operation (NOP) flit, where the NOP flit is encoded with debug information associated with an upper layer of a protocol stack. The generated NOP flit is then sent on the interconnect by the port.