Preamplifier-to-channel communication for storage device reconfiguration
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Solution Overview
Problem
Conventional preamplifiers in storage devices require new chip masks for reconfiguration, leading to inefficiencies in circuit pad usage and reconfiguration, as they rely on hardwired status registers that cannot be easily modified without significant changes.
Innovation Solution
Implementing a preamplifier-to-channel communication system using multiplexed digital control signals over a high-speed digital bus, allowing for programmable preamplifier register-field mapping and relocating analog processing functions to the preamplifier, which reduces the need for additional control lines and conserves circuit pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hardwired status registers are used in conventional preamplifiers, then the circuit design is simple and reliable, but reconfiguration requires new chip masks and cannot be easily modified
Solution Approach 1:
The patent implements dynamic reconfigurability by replacing hardwired status registers with programmable registers that can be dynamically programmed via software. The preamplifier status registers are no longer fixed during manufacturing but can be configured after production through digital programming, allowing the same hardware to adapt to different customer requirements without physical changes.
Solution Approach 2:
The patent changes the fundamental parameter of configuration from physical (hardwired circuit connections) to digital (programmable register values). By using programmable status registers that can be modified through software commands, the system transitions from static hardware configuration to dynamic software-based configuration, enabling reconfiguration without new chip masks.
2Adaptability or versatility
If multiple control lines are added to enable additional externally controlled functions, then functionality increases, but the number of bond pads and PCB area increase
Solution Approach 1:
The patent implements multi-functionality by enabling a single control line to serve multiple purposes through time-division multiplexing. The same physical control line can carry different control signals at different times, allowing one bond pad to control multiple externally controlled functions sequentially, thereby reducing the total number of bond pads required while maintaining enhanced functionality.
Solution Approach 2:
The patent employs periodic time-division multiplexing where control signals are transmitted in periodic time slots. By alternating between different control functions on the same physical line according to a timing schedule, the system achieves multiple control capabilities without requiring simultaneous dedicated lines for each function, thus conserving PCB area.
3Productivity
If analog processing functions are migrated to the preamplifier, then signal processing efficiency improves, but the complexity of the preamplifier increases
Solution Approach 1:
The patent introduces an intermediary communication mechanism (the multiplexed control bus) that enables coordinated operation between the preamplifier and channel. This intermediary digital communication interface allows the preamplifier to receive control commands and status information from the channel, enabling efficient analog processing while maintaining manageable complexity through structured digital coordination rather than direct complex analog interconnections.
Data Source
AI summary
An apparatus comprising a preamplifier, a channel, and a controller. The preamplifier may be configured to read/write data to a drive with a read/write head, in response to (i) a plurality of digital control signals multiplexed to be sent/received over a first bus and (ii) one or more analog data signals sent/received over a second bus. The channel may be configured to (i) connect to the first and second bus, and (ii) send/receive the plurality of digital control signals through (a) a plurality of interconnects and (b) the first bus. The controller may be configured to send/receive the digital control signals over the interconnects. The apparatus may be configured to (i) read/write the analog data signals to the drive and (ii) generate the digital control signals, in response to one or more input/output requests received from a drive interface.