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

Interface device for host device, interface device for slave device, host device, slave device, communication system and interface voltage switching method

A technology of an accessory device and an interface device, which is applied in the field of interface circuits, and can solve problems such as only switching the voltage of the interface circuit

Active Publication Date: 2013-03-20
PANASONIC CORP
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Furthermore, in the prior art, the premise is that the interface voltage between the master device and the slave device is at the same level as the voltage supplied from the master device to the slave device. The problem of switching only the voltage of the interface circuit stably during operation

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
  • Interface device for host device, interface device for slave device, host device, slave device, communication system and interface voltage switching method
  • Interface device for host device, interface device for slave device, host device, slave device, communication system and interface voltage switching method
  • Interface device for host device, interface device for slave device, host device, slave device, communication system and interface voltage switching method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0134] figure 1 It is a diagram showing the configuration of the communication system according to the first embodiment of the present invention.

[0135] Such as figure 1 As shown, the communication system according to this embodiment includes a main device 1 and an accessory device 2 . The master device 1 and the slave device 2 are connected by buses 30 to 32 .

[0136] The bus lines 31 and 32 are connected to an output voltage of a regulator described later via pull-up resistors R1 and R2.

[0137] The bus 30 is used for clock sending, the bus 31 is used for command sending and receiving, and the bus 32 is used for data sending and receiving.

[0138] Here, the command is an instruction from the master device 1 to perform register read / write processing, storage area read / write processing, or processing to acquire the status of the slave device 2 to the slave device 2 .

[0139] Although the command / data transmission and reception of the buses 31 and 32 are performed syn...

Embodiment 1

[0197] use Figure 3A An example (an example) of the communication system of the present embodiment described above will be described.

[0198] In this embodiment (hereinafter referred to as "Embodiment 1"), the first interface voltage is set to "V1" (for example, 3.3 [V]) and the second interface voltage is set to "V1" in the communication system. V2" (for example, 1.8 [V]), the case of switching the interface voltage from "V1" to "V2" will be described.

[0199] In addition, for the convenience of explanation, in Figure 3A The numbers (1) to (9) are assigned in the above, and the operation of the communication system in the first embodiment (processing (1) to (9)) will be described corresponding to the numbers.

[0200] Processing (1):

[0201] The master device 1 issues the command CMD, and then starts a voltage switching sequence (voltage switching process).

[0202] Processing (2):

[0203] The accessory device 2 returns a response to the main device 2 .

[0204] P...

no. 2 Embodiment approach

[0231] Next, use Figure 4 The flow chart of FIG. 2 describes the processing procedure for switching the interface voltage between the master device 1 and the slave device 2 of the communication system according to the second embodiment of the present invention.

[0232] In the communication system according to this embodiment, the input / output terminal 112 of the main device 1 and the input / output terminal 212 of the accessory device 2 may be open drain outputs. other components and figure 1 The descriptions are the same.

[0233]

[0234] Such as Figure 4 As shown, in the communication system according to the present embodiment, the slave device 2 operates in accordance with commands from the master device 1 . Therefore, when switching the interface voltage, first, the controller 100 of the master device 1 performs a process of issuing an I / F voltage switching command to the slave device 2 (SH401).

[0235] When the controller 200 of the accessory device 2 receives an...

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

A communication system in which an operating voltage can be selected from a plurality of interface voltages enables an interface voltage to be switched in a stable manner during operation of the system. When the interface voltage is to be switched, a host device (1) and a slave device (2) perform the switching while maintaining the signal level of buses in a stable manner. This structure enables the communication system to switch an interface voltage using a small number of signal lines.

Description

technical field [0001] The present invention relates to an interface circuit (device) capable of stably and efficiently switching interface voltages during the operation of a main device and an auxiliary device in a communication system capable of selecting an operating voltage from a plurality of interface voltages, and having the interface circuit (device) ), a main device, an auxiliary device, a communication system, and an interface voltage switching method. Background technique [0002] In recent years, attachments such as card-shaped SD cards and memory sticks that have large-capacity nonvolatile storage elements such as flash memory and can perform high-speed data processing have become popular in the market. It is used in main devices that can use accessory devices, that is, personal computers, PDAs (Personal Digital Assistants: Personal Digital Assistants), mobile phones, digital cameras, audio players, car navigation systems, and the like. [0003] In addition, in...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G06F1/26
CPCG06F1/26
Inventor 外山昌之吉田贵治坂井敬介
Owner PANASONIC CORP
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