Command Controller Prefetch Buffer Serial Flash Access
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Solution Overview
Problem
Embedded systems accessing serial flash frequently face performance degradation due to the need for numerous additional commands and addresses, and compatibility issues arise from vendor-specific instructions.
Innovation Solution
A command controller with a direct reader and command interpreter, and a prefetch buffer that processes and interprets commands to generate instructions for serial flash access, reducing the frequency of commands and addressing compatibility by translating vendor-specific instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If serial flash is accessed frequently, then data storage capacity is utilized, but performance decreases due to large number of additional commands and addresses
Solution Approach 1:
The patent implements a prefetch buffer that pre-loads data from serial flash into internal memory before the processor actually needs it. The command controller continuously monitors memory access patterns and proactively fetches data blocks in advance, converting frequent random access operations into fewer bulk transfer operations. This preliminary action reduces the frequency of command issuance to serial flash while ensuring data is ready when needed, thus maintaining high storage utilization without performance degradation.
Solution Approach 2:
The patent introduces a command controller as an intermediary layer between the processor and serial flash. This controller translates multiple processor memory access requests into optimized serial flash commands, batching operations and managing the prefetch buffer. The intermediary absorbs the complexity of frequent access patterns, converting them into efficient bulk transfer sequences, thereby decoupling the processor's data needs from the serial flash's command overhead.
2Reliability
If vendor specific instructions are used to control serial flash, then flash functionality is achieved, but compatibility problems arise between manufacturers
Solution Approach 1:
The command controller is designed with a universal command translation layer that can interpret and translate commands for multiple serial flash vendors. It maintains an internal mapping of vendor-specific instruction sets and automatically selects the appropriate translation rules based on the detected flash device type. This allows the same controller hardware to reliably control serial flash from different manufacturers without requiring vendor-specific hardware modifications, achieving both reliable functionality and broad compatibility.
Solution Approach 2:
The command controller serves as a compatibility intermediary between the processor and various serial flash vendors. It presents a standardized command interface to the processor while handling vendor-specific protocol variations internally. The controller detects the flash vendor type and automatically adapts the command sequences, addressing formats, and control signals to match the specific vendor's requirements, thereby ensuring reliable operation across different manufacturers without compromising compatibility.
Data Source
AI summary
The invention relates to a command controller and a prefetch buffer, and in particular, to a command controller and a prefetch buffer for accessing a serial flash in an embedded system. An embedded system comprises a serial flash, a processor, a plurality of access devices, and a prefetch buffer. The processor and the plurality of access devices send various commands to read data from or write data to the serial flash. The prefetch buffer temporarily stores a predetermined amount of data before data being read from or written to the serial flash.