Command Controller Prefetch Buffer Serial Flash Access
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Solution Overview
Problem
Embedded systems face performance issues when accessing serial flash due to the frequent issuance of additional commands and addresses, and compatibility problems arise due to vendor-specific instructions for serial flash control.
Innovation Solution
A command controller with a direct reader and command interpreter, along with a prefetch buffer, processes and interprets commands to generate instructions for serial flash access, reducing the need for frequent commands and addressing compatibility issues by translating vendor-dependent instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If serial flash is accessed using standard protocol with multiple commands and addresses, then compatibility with different vendors is maintained, but access time increases and performance deteriorates
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 anticipates data access requirements and initiates read operations in advance, storing data in the prefetch buffer where it can be quickly retrieved without requiring repeated command sequences. This preliminary action eliminates waiting time during actual data access operations.
Solution Approach 2:
The patent divides the serial flash access process into distinct functional segments: a command controller that handles protocol translation, a prefetch buffer for data staging, and a processor that consumes data. By segmenting the access architecture, the system can overlap command issuance with data transfer operations, allowing the processor to work with prefetched data while the command controller continues issuing commands in the background, thereby reducing overall access time.
2Adaptability or versatility
If vendor-specific instructions are used to control serial flash, then specific manufacturer requirements are met, but compatibility problems arise across different manufacturers
Solution Approach 1:
The command controller serves as an intermediary layer between the processor and the serial flash memory. It translates generic processor requests into vendor-specific command sequences required by different serial flash manufacturers. The prefetch buffer acts as another intermediary, buffering data between the serial interface and the processor. This mediation approach allows the system to maintain compatibility with multiple vendors while presenting a unified, simplified interface to the processor, thereby reducing command complexity.
Solution Approach 2:
The command controller is designed with universal functionality to handle multiple vendor protocols through a single unified interface. Rather than requiring separate hardware interfaces for different manufacturers, the command controller can adapt its command generation to work with various serial flash vendors using the same basic architecture. This multi-functionality reduces overall system complexity while maintaining broad vendor 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.