Sequential Read Optimization in Serial Flash Memory
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Solution Overview
Problem
The read performance of serial flash memory is limited by its slower serial interface compared to parallel interfaces, leading to reduced data transmission speed due to the need for separate command, address, and data channels.
Innovation Solution
Implementing a method where sequential read operations can be paused and resumed without additional command codes, sharing clock cycles and chip enable signals to improve data throughput by allowing continuous data output from memory devices with sequential addresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential read operations use separate command codes for each read request, then command protocol compliance is maintained, but read performance deteriorates due to increased overhead in clock cycles
Solution Approach 1:
The memory controller performs preliminary action by setting the sequential read mode bit in the command protocol before executing multiple sequential read requests. This preliminary configuration allows subsequent read requests to proceed without repeated command codes, reducing clock cycle overhead while maintaining protocol compliance through the pre-established mode setting.
Solution Approach 2:
The invention implements continuity of useful action by enabling the memory device to continue sequential read operations without interruption for command code transmission. Once the sequential read mode is activated, the memory controller can continuously output data for multiple read requests without requiring repeated command protocol sequences, thereby eliminating idle time and improving read performance.
2Device complexity
If serial interface is used to reduce pin connections and system cost, then device complexity is reduced, but read performance deteriorates due to slower data transmission speed
Solution Approach 1:
The invention applies dynamics by making the command protocol adaptive based on the read request pattern. The memory controller dynamically adjusts the command protocol execution by detecting whether read requests are sequential or random, and accordingly determines whether to use abbreviated mode (without command code) or full mode (with command code). This dynamic adjustment optimizes data transmission speed while maintaining the simplicity of the serial interface.
Data Source
AI summary
The present technology is directed to a method for accessing a memory device in response to read requests is described. The method comprises, in response to a first request, composing a first read sequence using a command protocol of the memory device. The first read sequence includes a command code and a starting physical address. Upon receipt of a second request, the method determines a starting physical address of a second read sequence according to the command protocol of the memory device. If the starting physical address of the second read sequence is sequential to an ending physical address of the first read sequence, then the method composes the second read sequence using the command protocol without a command code, else the method composes the second read sequence using the command protocol with a read command.