Data transfer control device and electronic equipment
First Claim
1. A data transfer control device for transferring data through a USB, comprising:
- a transfer controller that controls a data transfer; and
a power supply switching circuit that controls a switching of supplying power to a VBUS line of the USB,when the data transfer control device is a first data transfer control device connected to a type-A plug side of the USB and supplies power to the VBUS line, the transfer controller transmits a switching request packet of supplying power to a second data transfer control device connected to a type-B plug side of the USB, the switching request packet of supplying power containing a request to switch the supplying of power to the VBUS line to the second data transfer control device; and
if the transfer controller receives a switching acknowledgment packet of supplying power from the second data transfer control device connected to the type-B plug side, then the transfer controller instructs the power supply switching circuit to stop supplying power to the VBUS line, wherein the supplying of the power to the VBUS line is switched from the first data transfer control device connected to the type-A plug side of the USB to the second data transfer control device connected to the type-B plug side of the USB.
1 Assignment
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Accused Products
Abstract
Aspects of the invention can provide a data transfer control device and electronic equipment that can achieve to switch supplying power through a VBUS. The transfer controller can transmit a switching request packet of supplying power through a VBUS to a type-B plug connected side (a type-B device side). In the case when the transfer controller can receive a switching acknowledgment packet of supplying power through the VBUS, the transfer controller can instruct a power supply switching circuit to stop a power supply through the VBUS. A monitoring the voltage level of the VBUS can be stopped before stopping the power supply through the VBUS. A transfer controller can receive the switching request packet of supplying power through the VBUS from the type-A plug connected side (a type-A device side). In the case when the transfer controller acknowledges the switching, the transfer controller can transmit the switching acknowledgment packet of supplying power through the VBUS, and instructs the power supply switching circuit to start supplying power through the VBUS. The monitoring the voltage level of the VBUS can be stopped before starting the power supply through the VBUS. The switching request packet and switching acknowledgment packets can be transmitted using a control transfer.
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Citations
16 Claims
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1. A data transfer control device for transferring data through a USB, comprising:
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a transfer controller that controls a data transfer; and a power supply switching circuit that controls a switching of supplying power to a VBUS line of the USB, when the data transfer control device is a first data transfer control device connected to a type-A plug side of the USB and supplies power to the VBUS line, the transfer controller transmits a switching request packet of supplying power to a second data transfer control device connected to a type-B plug side of the USB, the switching request packet of supplying power containing a request to switch the supplying of power to the VBUS line to the second data transfer control device; and if the transfer controller receives a switching acknowledgment packet of supplying power from the second data transfer control device connected to the type-B plug side, then the transfer controller instructs the power supply switching circuit to stop supplying power to the VBUS line, wherein the supplying of the power to the VBUS line is switched from the first data transfer control device connected to the type-A plug side of the USB to the second data transfer control device connected to the type-B plug side of the USB. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15)
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8. A data transfer control device for transferring data through a USB, comprising:
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a transfer controller that controls a data transfer; a power supply switching circuit controlling a switching of supplying power to a VBUS line of the USB, when the data transfer control device is a second data transfer control device connected to a type-B plug side of the USB and power to the VBUS line is supplied by a first data transfer control device connected to a type-A side of the USB; if the transfer controller receives a switching request packet of supplying power to the VBUS line from the first data transfer control device connected to the type-A plug side, the switching request packet of supplying power contains a request that the second data transfer control device supply power to the VBUS line, then the transfer controller transmits a switching acknowledgment packet of supplying power to the VBUS line to the first data transfer control device connected to the type-A plug side and instructs the power supply switching circuit to start supplying power to the VBUS line, wherein the supplying of the power to the VBUS line is switched from the first data transfer control device connected to the type-A plug side of the USB to the second data transfer control device connected to the type-B plug side of the USB. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16)
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Specification