Hardware Timestamp Generation Circuit for Network Protocols
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Solution Overview
Problem
Existing network devices rely on software to generate timestamps, which can lead to inaccurate time information due to execution latency and resource unavailability, and lack flexibility in supporting different timestamp formats required by various network protocols.
Innovation Solution
A dedicated timestamp generation circuit is employed, which includes a compute circuit that receives a base timestamp and generates formatted timestamps based on instruction sets stored in memory, selected according to the network protocol, allowing for accurate and flexible timestamp generation with low latency and support for multiple formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If software is used to generate timestamps, then flexibility in supporting different timestamp formats is improved, but timestamp accuracy deteriorates due to execution latency and resource unavailability
Solution Approach 1:
The patent introduces a dedicated hardware timestamp generation circuit as an intermediary component between the network device and the host processor. This circuit includes a timestamp generator that receives packet data and generates timestamps in hardware, bypassing the software execution path. The circuit can be configured to support different timestamp formats through programmable control, thus maintaining format flexibility while achieving high accuracy through hardware-based timestamp generation with minimal latency.
2Device complexity
If software is used to generate timestamps, then device complexity is reduced, but productivity deteriorates due to wait cycles and resource contention
Solution Approach 1:
The patent extracts the timestamp generation function from the general-purpose host processor software and implements it in a dedicated hardware circuit. This separation allows the timestamp generation to occur independently and simultaneously with other processing tasks, eliminating wait cycles and resource contention. The hardware circuit operates autonomously to generate timestamps at line rate, significantly improving productivity without substantially increasing overall device complexity.
3Measurement precision
If hardware circuit is used to generate timestamps, then timestamp accuracy is improved, but device complexity increases
Solution Approach 1:
The patent designs a universal hardware timestamp generation circuit that can handle multiple network protocols and timestamp formats through programmable configuration. The circuit includes a configurable timestamp generator that can be programmed via control registers to support different formats (e.g., 32-bit, 64-bit timestamps, different time bases). This multi-functionality approach allows a single hardware circuit to serve multiple purposes, achieving high timestamp accuracy without proportionally increasing device complexity compared to having separate dedicated circuits for each protocol.
Data Source
AI summary
To support different timestamp formats, for example, for different network protocols, an integrated circuit device is provided with a memory that is programmed with multiple instruction sets associated with multiple timestamp formats. Each of the instruction sets contains instructions to generate a timestamp according to a corresponding timestamp format. A compute circuit can generate a formatted timestamp by using a base timestamp input and executing an instruction set selected from the multiple instruction sets stored in the memory.