Flash Memory Interface With FIFO Buffer For Rapid Access
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Solution Overview
Problem
Flash memory devices are not universally compatible with various devices and processors due to differing command sets and access requirements, and they often lack rapid access capabilities necessary for certain applications.
Innovation Solution
A peripheral interface circuit with a FIFO buffer and interface controller is used to interface between a computer processor and a flash memory circuit, providing a consistent interface across different flash memory devices and enabling rapid data access by mapping flash memory as part of the main processor memory, using protocols like SPI and 4-bit bidirectional communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flash memory devices use different command sets and protocols for device setup and operation, then device functionality is achieved, but compatibility with various processors and devices deteriorates
Solution Approach 1:
A peripheral interface circuit is introduced as an intermediary between the processor and flash memory device. This interface circuit translates between the processor's memory-mapped I/O requests and the flash memory's specific command sets and protocols, enabling compatibility without requiring the processor to handle multiple flash-specific protocols directly.
Solution Approach 2:
The peripheral interface circuit provides a universal interface that can accommodate multiple flash memory devices with different command sets. By implementing a standardized memory-mapped interface, the system achieves multi-functionality where a single interface design can work with various flash memory types and protocols.
2Productivity
If flash memory is accessed using traditional command-driven protocols, then device control is achieved, but access speed deteriorates
Solution Approach 1:
The flash memory device is pre-configured with default command sequences and parameters stored in registers. When the processor initiates a memory-mapped access, the peripheral interface circuit automatically executes the pre-prepared command sequences without requiring the processor to manually construct and send each command, significantly improving access speed.
Solution Approach 2:
The flash memory interface operates in a self-service manner where the peripheral interface circuit autonomously manages command generation, parameter configuration, and data transfer timing. The interface automatically handles the complex protocol sequences without requiring continuous processor intervention, enabling faster autonomous operation.
Data Source
AI summary
Flash-type memory access and control is facilitated (e.g., as random-access memory). According to an example embodiment, an interface communicates with and controls a flash memory circuit over a peripheral interface bus. The interface uses a FIFO buffer coupled to receive data from and store data for the flash memory circuit and to provide access to the stored data. An interface controller communicates with the flash memory circuit via the peripheral interface bus to initialize the flash memory circuit and to access data thereto, in response to requests from a processor. In some applications, the flash memory circuit is initialized by sending commands to it. The interface may be placed into a read-only mode in which data in the flash memory is accessed as part of main (computer) processor memory, using the FIFO to buffer data from the flash.