US 8,135,874 B2Granted

Automatic mapping and updating computer switching device

AssigneeJune-On Technology Co., Ltd.

InventorsJung-Wei Tseng, Cheng-Sheng Chou, Hung-June Wu

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Abstract

The present invention relates to an automatic mapping and updating computer switch device. The computer switching device provides the compatibility between a plurality of devices and a plurality of computers, and comprises a USB host chip connected to the plurality of peripheral devices each containing a USB connector for sending the necessary data (USB device descriptor/report) to a plurality of USB device chips, thus, the computers can acquire the necessary data of the peripheral devices through the connected USB device chips. Whenever the computer switching device re-boots or any of the peripheral devices are plugged in/pulled out, the USB host chip reads the new necessary data again with the previous ones, if any differences are found, the new necessary data is send to the USB device chips for storage. The aforesaid procedure is called DDM (Dynamic Devices Mapping) or full USB Enumeration or full USB Initiation.

Claims5

Dependent claims

An automatic mapping and updating computer switching device for automatic executing enumeration between a plurality of peripheral devices and a plurality of computers, comprising:

a USB host chip electrically connected to said peripheral devices;
and
a plurality of USB device chips electrically connected between said USB host chip and said computers;
wherein, in a standard USB procedure for standard USB devices which are connected as peripheral devices, which is performed when said computer switching device is turned on, said USB host chip acts as a computer to receive the enumeration command/data from the peripheral device and stores the enumeration command/data in a USB host chip memory, and said USB host chip transfers the enumeration command/data to said USB device chip and said USB device chip stores the transferred enumeration command/data in a USB device chip memory, and said USB device chip acts as a peripheral device to transfer the enumeration command/data to the computer, so that the peripheral device is enumerated by the USB host chip as a standard USB device, wherein all the enumeration command/data in the above procedure are recorded in said USB host chip and said USB device chip,
wherein, in a comparison procedure, where the enumeration command/data of the previously connected peripheral device is stored, as an old enumeration command/data, in the USB host chip memory, and the enumeration command/data of a plugged/unplugged peripheral device is as a new enumeration command/data, and the comparison procedure is performed when said automatic mapping and updating computer switching device re-boots and when any of said peripheral devices is plugged/unplugged, the USB host chip performs the comparison of the old stored enumeration command/data with the new enumeration command/data, and if the result of the comparison is the same, the USB host chip performs nothing, or if there is any difference therebetween, the USB host chip performs the standard USB procedure for each peripheral device,
wherein all of the respective enumeration command/data for each of the peripheral devices enumerated as a standard USB device in the previous procedures are transferred by the USB host chip to all of the USB device chips.

3 more elements

An automatic mapping and updating computer switching device for automatic executing enumeration between a plurality of peripheral devices and a plurality of computers, comprising:

a USB host chip, a plurality of USB device chips, a USB hub chip and a USB switch chip, wherein,
said USB hub chip is electrically connected to said peripheral devices to individually receive enumeration command/data for each of said peripheral devices, said USB hub chip transmits the enumeration command/data to said USB switch chip and said USB host chip;
said USB switch chip for selecting USB device chips is electrically connected between said USB hub chip and said USB device chips for sending the received enumeration command/data from the USB hub chip to a selected USB device chip of said USB device chips;
said USB host chip is electrically connected between said USB hub chip and said USB device chips, and said USB device chips are respectively electrically connected to one of the plurality of computers that is individually connected therewith,
wherein, in a standard USB procedure for standard USB device which are connected as peripheral devices, which is performed when said computer switching device is turned on, said USB host chip acts as a computer to monitor and receive the enumeration command/data from the USB hub chip to the switch chip and stores the enumeration command/data in a USB host chip memory, and the USB switch chip transfers the enumeration command/data to the selected USB device chip and the selected USB device chip stores the transferred enumeration command/data in a USB device chip memory, and said USB device chip acts as a peripheral device to transfer the enumeration command/data to the computer so that the peripheral device is enumerated by the USB host chip as a standard USB device, wherein all the enumeration command/data in the above procedure are recorded both in said USB host chip and said selected USB device chip, and then said USB host chip transfers all the enumeration command/data recorded therein to the other USB device chips which are not selected by said USB switch chip,
wherein, in a comparison procedure, where the enumeration command/data of the previously connected peripheral device is stored, as an old enumeration command/data, in the USB host chip memory, and the enumeration command/data of a plugged/unplugged peripheral device is as a new enumeration command/data, and the comparison procedure is performed when said automatic mapping and updating computer switching device re-boots and when any of said peripheral devices is plugged/unplugged, the USB host chip performs the comparison of the old stored enumeration command/data with the new enumeration command/data, and if the result of the comparison is the same, the USB host chip performs nothing, or if there is any difference therebetween the USB host chip performs the standard USB procedure for each peripheral device.

3 more elements

Dependencies are inferred from the claim text.