Bidirectional Serial Port for Storage Device Signal Lines
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Solution Overview
Problem
Conventional communication schemes in data storage devices, such as hard disk drives, are inefficient due to the large number of dedicated signal lines required for transmitting data and control signals between the recording channel, preamplifier, and controller, which limits speed and flexibility.
Innovation Solution
Implementing a serial port that uses a single bidirectional serial data line to transmit digital signals between the controller and preamplifier, allowing for selective direction of signal transmission to improve communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional communication schemes with dedicated signal lines are used, then reliability of signal transmission is improved, but device complexity increases due to the large number of signal lines required
Solution Approach 1:
The patent combines multiple dedicated signal lines (clock line, data line, enable line, and other control lines) into a single bidirectional serial data line. The serial port interface integrates all these separate communication channels into one unified interface, thereby reducing the total number of signal lines while maintaining reliable communication between the controller and preamplifier.
Solution Approach 2:
The single bidirectional serial data line serves multiple functions that previously required separate dedicated lines. It transmits both data and control signals in both directions, replacing the functionality of multiple unidirectional dedicated lines. This multi-functional approach reduces wiring complexity while preserving communication reliability.
2Ease of operation
If multiple dedicated control bus lines are used, then ease of operation is improved for control functions, but productivity decreases due to the inefficiency in terms of number of signal lines
Solution Approach 1:
The patent merges control functions that previously required separate dedicated control bus lines into the unified serial port interface. The serial communication protocol handles setup, status monitoring, and configuration register access all through the single bidirectional data line, improving communication efficiency while maintaining ease of operation through standardized serial protocols.
3Device complexity
If a three wire serial port is used, then device complexity is reduced compared to conventional buses, but productivity decreases due to polling and latency characteristics
Solution Approach 1:
The patent implements a dynamic bidirectional serial data line that can switch transmission directions based on communication needs. Unlike traditional unidirectional serial ports, this bidirectional interface can dynamically change the direction of data flow between controller and preamplifier, reducing latency by allowing immediate response without waiting for polling cycles. The interface dynamically allocates the single data line for different directions of communication as needed.
Data Source
AI summary
A method is provided to enable communication between a controller and a preamplifier in a storage device. For example, the method includes implementing a serial port which is configured to transmit digital signals between the controller and the preamplifier over a single bidirectional serial data line. The serial port is controlled to selectively transmit digital signals over the bidirectional serial data line in either a first direction from the controller to the preamplifier or a second direction from the preamplifier to the controller.