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Communication apparatus, switching method, and switching program

A technology of communication device and conversion unit, which is applied in the direction of instruments, electrical digital data processing, etc.

Inactive Publication Date: 2006-12-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before retransfer, it is necessary to perform initialization again to re-establish the connection between USB and external devices, which creates a lot of inconvenience

Method used

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  • Communication apparatus, switching method, and switching program
  • Communication apparatus, switching method, and switching program
  • Communication apparatus, switching method, and switching program

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0043] A communication device according to a first embodiment of the present invention will be described below with reference to the drawings.

[0044]

[0045] figure 1 Shown is an example system in which the communication device 100 of the first embodiment is connected to another communication device 110 . The communication device 100 functions as a host and transmits data with the communication device 110 connected thereto. The host mentioned here has functions such as managing address allocation and data transmission timing relative to the communication device 110 . Meanwhile, the communication device 110 functions as a device.

[0046] The communication device 100 includes a USB host 101 , a serial I / O 102 , an arbitration circuit 103 , a negative acknowledgment (NAK) circuit 104 , a transceiver 105 , a storage medium 106 , a CPU 107 and a bus 108 . The communication device 110 includes a USB device 111 , a serial I / O 112 , an arbitration circuit 113 , a transceiver ...

no. 2 approach

[0076] A second embodiment of the present invention relates to another method of converting between differential and single-ended signals by a host and a device connected to the host.

[0077] A communication device according to a second embodiment of the present invention will be described below with reference to the drawings.

[0078]

[0079] Figure 4 Shown is a structural and functional block diagram of the communication device 400 according to the second embodiment.

[0080] In the drawing, a communication device 400 includes a USB host 410 , a serial I / O 420 , an arbitration circuit 430 , a negative acknowledgment circuit 440 , a transceiver 450 , a storage medium 460 , a CPU 470 and a bus 480 . This communication device 400 basically has the same configuration as the communication device 100 of the first embodiment. It differs from the first embodiment in that a synchronization port is newly included in the communication device 400 to switch in synchronization with...

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Abstract

To provide a communication apparatus which selectively performs a data transfer by differential signaling and a data transfer by single-ended signaling using a USB cable, where a USB host in the communication apparatus can recognize USB connection even when differential signaling is switched to single-ended signaling. The communication apparatus performs the data transfer by differential signaling using two data transfer signal lines in the USB cable, and the data transfer by single-ended signaling using one of the two data transfer signal lines. The communication apparatus includes a NAK circuit which, when differential signaling is switched to single-ended signaling, outputs a NAK response to the USB host to have the USB host recognize the USB connection.

Description

technical field [0001] The invention relates to a communication device using a Universal Serial Bus (Universal Serial Bus, USB) cable for data transmission. Background technique [0002] A data transfer using a USB cable is performed in such a manner that when a device is connected to the host, the host detects the connection and performs initialization such as assigning an address to the connected device to enable data transfer between the host and the device. Then, data transmission is performed based on differential signaling. Differential signaling is a method of transmitting data one bit at a time using two signal wires. In differential signaling, one signal line transmits data of one phase, the other signal line transmits data of the opposite phase, and the receiving end reads the potential difference between the two signal lines as a signal value. Here, the difference takes one of two values. If the difference is large, the signal value is "1". If the difference i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/38
CPCG06F13/385
Inventor 坂木清治落合成幸
Owner PANASONIC CORP
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