Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for realizing control of storage card by digital equipment by expanding SD/MMC protocol

A digital device and protocol implementation technology, applied in the direction of input/output to record carrier, etc., can solve the problems of single read and write operations, and cannot meet the higher needs of users

Active Publication Date: 2012-05-30
RDA MICROELECTRONICS SHANGHAICO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to solve the shortcoming that the current SD / MMC card can only perform a single read and write operation in accordance with the standard protocol, but cannot realize the functions required by the user, and provides a digital device by extending the SD / MMC protocol. The special control method of SD / MMC memory card, using this method can realize other special and complex requirements besides reading and writing functions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for realizing control of storage card by digital equipment by expanding SD/MMC protocol
  • Method for realizing control of storage card by digital equipment by expanding SD/MMC protocol
  • Method for realizing control of storage card by digital equipment by expanding SD/MMC protocol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The CMD command format of SD / MMC is as follows Figure 5 As shown, the specific description is as follows:

[0031] ●Start bit: start bit, the value is '0';

[0032] ●Transmission bit: Indicates the direction of transmission start host='1';

[0033] ●Command index: command index (CMD17 single-block read, CMD18 multi-block read, CMD24 single-block write, CMD25 multi-block write, most hosts HOST use CMD18 and CMD25);

[0034] ●Argument: some commands require an argument, such as read and write commands, the address is stored in this argument;

[0035] ●CRC7: 7bit CRC check digit;

[0036] ●End bit: End bit, the value is '1'.

[0037] Define the data block size for each reading and writing in the CSD register of the SD / MMC card, and calculate the data block size by formula 2 READ_BL_LEN , it is concluded that the value range of READ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of SD / MMC storage cards, in particular to a method for realizing control of a storage card by digital equipment by expanding an SD / MMC protocol. The method uses highbits of address bit Argument of reading and writing commands stipulated by the SD / MMC protocol as an identification mark of an expansion command, defines parameters of the expansion command, and controls the storage card to perform special operations except for single data reading and writing function by adopting the expansion command. The method is quite simple and feasible, and makes the digital equipment control the storage card to perform specific functions except for single data reading and writing function through the expansion protocol, thereby meeting various special and complex requirements of users on the storage card during use.

Description

technical field [0001] The invention relates to the field of SD / MMC memory cards, in particular to a method for realizing the control of digital devices on the memory card by extending the SD / MMC protocol. Background technique [0002] The current memory cards such as SD / MMC only have a simple storage function, and all its behaviors are controlled by the host (HOST). The memory card is only used to store data, and its main function is to store and read data. The host sends a write command, the memory card performs write operations according to the address, the host sends a read command, and the memory card reads data according to the address and transmits it to the host. In addition, the memory card has no features and advantages. [0003] The disk structure of the memory card is as follows figure 1 As shown, it includes the main boot sector, partition boot sector, FAT table, root directory area, and data area. The main functions of each partition are as follows: [0004]...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F3/08
Inventor 徐璐闫华
Owner RDA MICROELECTRONICS SHANGHAICO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com