Interface integrated circuit device for a USB connection
First Claim
1. An interface integrated circuit device for interfacing a universal serial bus (USB) connection to a further circuit, the interface integrated circuit comprising:
- first terminals for connecting to a USB bus;
a transceiver for transceiving for both a USB host and a USB device, the transceiver having a USB interface, a host interface and a device interface, the USB interface being coupled to the first terminals;
second terminals coupled to the device interface for connection to an external USB device controller;
a host controller coupled to the host interface, the host controller having a parallel data/address bus;
third terminals coupled to the parallel data/address bus.
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Accused Products
Abstract
An electronic apparatus with a USB connection has a functional circuit with a processor, a parallel address data bus couple to the processor and a USB device controller circuit with a USB interface in parallel with said address/data bus. The apparatus contains an interface integrated circuit electronically between the USB connection on one hand and the parallel address/data interface and the USB interface on the other hand. The interface integrated circuit has external terminals for connecting to a USB bus, a transceiver capable of transceiving for both a USB host and a USB device, the transceiver having a USB interface, a host interface and a device interface. The USB interface is coupled to the USB connection. The device interface is connected to the external USB device controller circuit. A host controller is coupled to the host interface, the host controller being coupled to the functional circuits via the parallel data/address bus.
22 Citations
15 Claims
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1. An interface integrated circuit device for interfacing a universal serial bus (USB) connection to a further circuit, the interface integrated circuit comprising:
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first terminals for connecting to a USB bus; a transceiver for transceiving for both a USB host and a USB device, the transceiver having a USB interface, a host interface and a device interface, the USB interface being coupled to the first terminals; second terminals coupled to the device interface for connection to an external USB device controller; a host controller coupled to the host interface, the host controller having a parallel data/address bus; third terminals coupled to the parallel data/address bus. - View Dependent Claims (2, 3, 4)
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5. An electronic apparatus with a universal serial bus (USB) connection, the electronic apparatus comprising:
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a functional circuit with a processor, a parallel address data bus coupled to the processor and a USB device controller circuit with a USB interface in parallel with said address/data bus; and an interface integrated circuit electronically between the USB connection on the one hand and the parallel address/data bus and the USB interface on the other hand, the interface integrated circuit including; first terminals for connecting to the USB connection; a transceiver for transceiving for both a USB host and a USB device, the transceiver having a USB interface, a host interface and a device interface, the USB interface being coupled to the first terminals;
the device interface being connected to the USB device controller circuit in said functional circuit; anda host controller coupled to the host interface, the host controller being coupled to the processor via the parallel data/address bus. - View Dependent Claims (6, 7, 8)
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9. An electronic system comprising:
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a universal serial bus (USB) bus connection; a host apparatus and a device apparatus, at least one of the host and the device apparatus including a functional circuit with a processor, a parallel address data bus coupled to the processor and a USB device controller circuit with a USB interface in parallel with said address/data bus; and an interface integrated circuit electronically between the USB bus connection on the one hand and the parallel address/data bus and the USB interface on the other hand, the interface integrated circuit including; first terminals for connecting to a the USB bus connection; a transceiver for transceiving for both a USB host and a USB device, the transceiver having a USB interface, a host interface and a device interface, the USB interface being coupled to the first terminals;
the device interface being connected to the USB device controller circuit;a host controller coupled to the host interface, the host controller being coupled to the processor via the parallel data/address bus. - View Dependent Claims (10, 11, 12)
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13. A method of operating an interface integrated in a universal serial bus (USB) system, the method comprising:
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receiving a selection whether the apparatus containing the interface integrated circuit should operate as a USB host or as a USB device; transceiving USB signals with a transceiver in the interface integrated circuit; sequencing USB communication via the transceiver with a host controller in the interface integrated circuit and communicating USB transceived data to or from functional circuits outside the integrated circuit via a parallel address data interface when USB host operation is selected, and passing USB signals from the transceiver to a device controller in the functional circuits outside the integrated circuit when USB device controller operation is required. - View Dependent Claims (14, 15)
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Specification