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Data transmission controller, electronic device and data transmission method

A data transmission and control device technology, applied in the direction of electrical digital data processing, transmission systems, electrical components, etc., can solve the problems of loss of bus frequency band, slow processing speed, and inability to ensure transmission speed, etc., to achieve processing and reduce processing load Effect

Inactive Publication Date: 2007-11-28
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, on the other hand, the data transfer control device connected to the USB bus must handle data transferred at a high speed of 480Mbps.
Therefore, if the processing speed of the data transfer control device and the processing speed of the firmware (CPU) that controls the data transfer control device are slow, an effective transfer speed cannot be ensured, and there is a problem that the bus bandwidth will be lost.

Method used

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  • Data transmission controller, electronic device and data transmission method
  • Data transmission controller, electronic device and data transmission method
  • Data transmission controller, electronic device and data transmission method

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Embodiment Construction

[0053] Hereinafter, the present embodiment will be described in detail with reference to the drawings.

[0054] The present embodiment described below does not limit the content of the present invention described in the claims. In addition, the entire structure described in this embodiment does not necessarily necessarily serve as the solution means of the present invention.

[0055] 1.USB

[0056] 1.1 Data transfer method

[0057] First, the data transfer method of USB (USB2.0) will be briefly described.

[0058] In USB, unlike IEEE1394, etc., the host has the dominance of data transfer. That is, the transaction that initiates the data transfer is on the host side, and the host performs most of the control related to the data transfer. Therefore, the processing load of the host is heavy, but since a PC (personal computer) or the like serving as the host has a high-speed and high-performance CPU (processor), there is no problem in processing such a heavy load.

[0059] On...

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Abstract

A buffer is provided with a CBW area (a randomly accessible command storage area) and an EP1 area (data storage area set to FIFO), when a CBW and data are allocated as informations to be transferred through one end point EP1. When a phase switches from a USB command phase (command transport) to a data phase (data transport), the information write area is switched from the CBW area to the EP1 area and OUT data transferred from the host to the end point EP1 is written into the EP1 area. The area switches from the CBW area to the EP1 area on condition that an acknowledgment has returned to the host in the command phase. In case of a toggle missing, area switching does not occur even if ACK is returned.

Description

technical field [0001] The present invention relates to a data transfer control device, an electronic device and a data transfer control method. Background technique [0002] In recent years, USB (Universal Serial Bus) has attracted attention as a stage standard for connecting personal computers and peripheral devices (electronic devices in a broad sense). In this USB, peripheral devices such as mice, keyboards, and printers, which were previously connected with connectors of various standards, can be simultaneously connected with the same standard connectors, which has the advantage of realizing so-called plug-and-play or hot-plugging. [0003] On the other hand, in this USB, as the standard of the same serial bus stage, there is a problem that the transfer speed is slow compared with the prominent IEEE1394. [0004] Therefore, the USB 2.0 standard, which is compatible with the existing USB 1.1 standard and can realize a very high data transfer speed of 480 Mbps (HS mode) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/00G06F13/38H04L13/08
CPCG06F13/385G06F13/38
Inventor 石田卓也神原义幸
Owner SEIKO EPSON CORP