Programmable Timer Synchronizing IEEE 1588 Time Base
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional programmable timers lack the ability to be synchronized with external sources, leading to inaccuracies in distributed control systems and increased latency and costs due to reliance on microprocessor-based software solutions.
Innovation Solution
A programmable timer system that synchronizes its channel time base with an external source, such as IEEE 1588, allowing for coordinated input capturing and output generation across multiple devices with high accuracy, using methods like detecting packets and calculating difference values to modify the synchronized time base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a programmable timer uses a microprocessor-based software solution to service timer channels, then flexibility is improved, but latency increases and system resources are consumed
Solution Approach 1:
The timer system is segmented into independent hardware logic components that handle specific timer channel operations autonomously, separating these functions from the microprocessor. This allows timer operations to execute in parallel with other microprocessor tasks, reducing latency while maintaining flexibility through programmable control registers.
Solution Approach 2:
Dedicated hardware logic acts as an intermediary between the microprocessor and timer channels, handling time-critical operations independently. This intermediary hardware layer processes timer events with minimal latency while the microprocessor handles higher-level control, optimizing both speed and flexibility.
2Loss of time
If a programmable timer uses dedicated hardware logic to service timer channels, then latency is reduced, but adaptability decreases
Solution Approach 1:
The timer hardware logic is designed with programmable control registers and configurable parameters that allow its behavior to be dynamically adjusted via microprocessor commands. This enables the same hardware structure to adapt to different timing requirements and applications while maintaining fast hardware-level execution.
Solution Approach 2:
The dedicated hardware logic is designed to service multiple timer channels with a unified architecture, providing universal functionality across different timer operations. This multi-channel capability maintains adaptability while leveraging hardware efficiency for low-latency performance.
3Adaptability or versatility
If multiple timers operate with independent clock sources in a distributed control system, then device independence is improved, but time synchronization accuracy deteriorates
Solution Approach 1:
The timer system incorporates a feedback mechanism that monitors the time base and automatically adjusts for drift by comparing against a reference frequency source. This closed-loop control maintains accurate time synchronization across distributed devices while preserving their operational independence.
Solution Approach 2:
The system dynamically changes the frequency parameter of the time base by locking to an external reference source when synchronization is required, while allowing independent operation when not needed. This parameter adjustment enables the timer to adapt between synchronized and independent modes as needed.
Data Source
AI summary
A system and method are provided for synchronizing a programmable timer time base and external time signal. The method either accepts or supplies an external time signal (e.g., IEEE 1588) at an external interface, links a synchronized time base to the external time signal, and clocks a channel time base with the synchronized time base. Then, a timer channel can be used to perform programmable timer functions in response to the channel time base. Some programmable timer functions include input capture, output compare, quadrature decoding, pulse measurement, frequency measurement, and pulse width modulation (PWM) functions, in one aspect, accepting the external time signal at the external interface includes detecting a packet with a time value, in another aspect, the method uses the channel to detect an event at a channel external interface, and compares the channel time base counter value with an expected value to modify the synchronized time base.