Hard Disk Status Testing Apparatus Pin Multiplexing
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Solution Overview
Problem
The increasing number of hard disks requires a proportional increase in hardware resources for management, leading to a waste of pin resources and increased hardware costs due to the need for multiple independent pins for testing and status indication.
Innovation Solution
A hard disk status testing apparatus and method that uses a voltage reading module, controller, and analogue switch to time-multiplex hard disk status testing and indication modules, reducing the number of pins needed by combining signals and optimizing indicator lamp control pins, thereby saving pin resources and simplifying PCB routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent pins are used for testing and status indication of each hard disk, then the reliability of hard disk status monitoring is improved, but the number of pin resources occupied increases linearly with the number of hard disks
Solution Approach 1:
The patent combines multiple independent testing functions (presence testing, activity status testing) and indication functions (location, activity, fault LEDs) into a single shared pin resource. The analog switch multiplexer allows one pin to sequentially connect to multiple hard disk slots for testing, while the same pin controls multiple LED indicators through time-multiplexed scanning, thereby merging previously separate functions into a shared resource.
Solution Approach 2:
The patent implements periodic scanning of hard disk slots through the analog switch multiplexer, where the controller sequentially selects different slots at regular intervals for testing. Similarly, the LED indicators are updated periodically by scanning through each slot's status indicators in sequence, creating a time-multiplexed display system that refreshes faster than human perception threshold.
Solution Approach 3:
The patent makes a single pin resource perform multiple functions: it can test presence status of different hard disks at different time slots, test activity status of different hard disks, and control multiple LED indicators (location, activity, fault) for different slots. This multi-functional pin replaces what would traditionally require multiple dedicated pins.
2Adaptability or versatility
If more pin resources are allocated for hard disk management, then the functionality and reliability of status testing and indication are improved, but the hardware cost increases
Solution Approach 1:
The patent merges multiple independent pin connections into a single shared pin connection by introducing an analog switch multiplexer. This consolidation reduces the number of PCB traces, connectors, and pin requirements, directly lowering hardware component costs and simplifying the overall system architecture while maintaining full management functionality.
Solution Approach 2:
The analog switch multiplexer acts as an intermediary device between the controller's single pin resource and the multiple hard disk slots. This mediator enables one pin to communicate with multiple slots sequentially, providing the functionality of multiple pins through a single physical connection point, thereby reducing hardware cost.
3Difficulty of detecting and measuring
If independent pins are used for each hard disk slot testing and indication, then the ease of detecting and measuring hard disk status is improved, but the device complexity increases
Solution Approach 1:
The patent segments the hard disk monitoring system into independent functional modules: presence testing module, activity status testing module, and LED indication module. Each slot has its own testing circuitry that can be selectively activated through the analog switch, allowing modular design that simplifies debugging and maintenance while reducing overall pin requirements.
Solution Approach 2:
The analog switch multiplexer serves as an intermediary that manages the complexity of connecting multiple slots to a single pin. It provides a structured, controlled way to switch between different slots and functions, simplifying the control logic in the controller while maintaining easy access to all hard disk statuses through sequential scanning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively decreases hardware costs and increases pin resource utilization by reducing the number of pins required for hard disk status testing and indication, making it suitable for backplanes with multiple hard disks.
Implementation Method 1
a voltage reading module 1, a controller 2, an analogue switch 3... an output end of the analogue switch 3 is connected to an input end of the voltage reading module 1
Data Source
AI summary
A hard disk status testing apparatus, including: a voltage reading module, a controller, an analogue switch, and multiple hard disk slot units. Each hard disk slot unit includes: a hard disk status testing module and a hard disk status indication module. The hard disk status testing modules and the hard disk status indication modules among different hard disk slot units are time-multiplexed, achieving independent control of the hard disk status testing modules of different hard disk slot units and independent control of the hard disk status indication modules of different hard disk slot units. A hard disk status testing method that effectively solves the problem of an increase in the number of pins needed for hard disk status testing and status indication, thus effectively decreasing hardware costs and increasing the utilization rate of pin resources.