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Transmitting circuit and data transmission controller and electronic machine

A technology of data transmission control and sending circuit, applied in digital transmission system, electrical digital data processing, input/output process of data processing, etc., can solve the problem of slow transmission speed, and achieve the effect of avoiding voltage rise

Inactive Publication Date: 2005-02-23
SEIKO EPSON CORP
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] On the other hand, the problem with this USB is that, also as a serial bus interface standard, the transmission speed is slow compared with the eye-catching IEEE1394.

Method used

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  • Transmitting circuit and data transmission controller and electronic machine
  • Transmitting circuit and data transmission controller and electronic machine
  • Transmitting circuit and data transmission controller and electronic machine

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0053] Specific ways of implementing the invention

[0054] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0055] 1.USB2.0

[0056] If USB2.0 is adopted, a plurality of peripheral devices corresponding to USB1.1 or USB2.0 can be connected to a personal computer as a master device for managing the bus through a jack device.

[0057] A host controller corresponding to USB 2.0 is installed in such a host device. The main controller judges whether the connected machine corresponds to USB1.1 or USB2.0, and controls data transmission through the bus.

[0058] In addition, for example, a jack controller corresponding to USB2.0 is installed in the jack device. The jack controller judges whether the connected peripheral machine corresponds to USB1.1 or USB2.0, and controls the bus transmission mode.

[0059] In addition, a device controller corresponding to USB1.1 or USB2.0 is installed in the peripheral mac...

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Abstract

There are provided a transmission circuit capable of stabilizing high-speed data transfer by driving current, a data transfer control device, and electronic equipment. An HS current driver (transmission circuit) included in a data transfer control device has a current source connected between a first power supply AVDD and a node ND, and switching devices SW1 to SW3, one ends of which are connected to the node ND. The other end of the switching device SW1 is connected to a DP terminal. The other end of the switching device SW2 is connected to a DM terminal. The other end of the switching device SW3 is connected to a DA terminal. The DA terminal is connected to a second power supply AVSS inside or outside the transmission circuit. The transmission circuit is configured so that impedances of each current path from the node ND through the switching devices SW1 to SW3 become substantially equal when the switching device is turned on. This prevents an increase in the voltage of the node ND in a non-signal-transmission period.

Description

technical field [0001] The present invention relates to a transmission circuit, a data transmission control device and an electronic apparatus. Background technique [0002] In recent years, attention has been focused on USB (Universal Serial Bus) as an interface standard for connecting a personal computer and peripheral equipment (in a broad sense, electronic equipment). The advantage of this USB is that peripheral devices such as mice, keyboards, and printers that have hitherto been connected with various standard connectors can be connected with the same standard connector, and at the same time, so-called plugs and work or hot plugs can be realized. [0003] On the other hand, the problem with this USB is that, also as a serial bus interface standard, the transmission speed is slow compared to the attractive IEEE1394. [0004] Now, the established USB2.0 standard is eye-catching. The USB2.0 standard not only has low-level interchangeability with the existing USB1.1 stand...

Claims

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Application Information

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IPC IPC(8): G06F3/00G06F13/40H04L7/033H04L25/02
CPCH04L7/033G06F13/4072
Inventor 中田章阿部彰笠原昌一郎
Owner SEIKO EPSON CORP
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