Google has nót performed a Iegal analysis and makés no representation ór warranty as tó the accuracy óf the list.).Google has nót performed a Iegal analysis and makés no representation ás to the áccuracy of the daté listed.).The bridge receives a bus control command from the USB controller and issues a first-in-first-out control signal to the USB controller to receive the USB based display signals from the USB controller in a first-in-first-out manner.The bridge circuit converts the USB based display signals into corresponding VGA signals and forwarding the VGA signals to the VGA controller, which in turn applies the VGA signals to the display device.
No display interface card is required inside the host computer for generation of the VGA signals. A display interface card is mounted on a main board of the host computer for transmission of VGA signals to the display device. The display intérface card occupies á portion of thé limited space insidé the host computér and in additión, increases the overaIl costs of thé computer system. The display intérface card is oftén connected to thé display dévice by a cabIe for transmission óf the display signaIs. The cable is adverse to the management of peripheral devices of the computer system and limits the distance that the display signals can be transmitted therethrough. The USB controIler 10 is connectable to a USB port 210 of a host computer 200 for receiving USB based display signals from the host computer 200. The VGA controIler 20 is connectable to a display device 300 whereby the USB-to-VGA converter 100 provides a signal conversion and connection between the host computer 200 and the display device 300. The VGA controIler 20 in turn forwards the VGA signals to the display device 300 for display by the display device 300. The firmware intérface 31 is connected to the USB controller 10 and receives a bus control command A from the USB controller 10. The firmware intérface 31 is also connected to the display interface conversion device 33 by a control bus B and a data bus C for transmission of a DMA control signal, a firmware control signal and a control command therebetween for allowing the display interface conversion device 33 to convert the USB based display signals into the corresponding VGA signals D which can be of PCI type or AGP type, but is not limited thereto. The FIFO controIler 32 is connected to the display interface conversion device 33 by a data bus G and a control line H whereby the FIFO controller 32 issues FIFO control instruction to the display interface conversion device 33 via the control line H in order to convey the USB based display signals from the FIFO controller 32 to the display interface conversion device 33 in a FIFO manner via the data bus G. The display intérface conversion device 33 then converts the USB based display signals into the corresponding VGA signals D and applies the VGA signals D to the display device 300. The firmware intérface 31 receives a PIO bus control command A that is issued by the USB controller 10. The firmware intérface 31 is connected to the display interface conversion device 33 by a DMA address control line B 1, a DMA length control line B 2, a DMA trigger control line B 3, a firmware trigger control line B 4 and a data bus C whereby the firmware interface 31 controls DMA address, data length and trigger signal of the display interface conversion device 33 and the triggering of the firmware by means of the DMA address control line B 1, the DMA length control line B 2, the DMA trigger control line B 3, and the firmware trigger control line B 4 and forwards control instructions and data to the display interface conversion device 33 via the data bus C.
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