Universal serial bus (USB) RAM architecture for use with microcomputers via an interface optimized for integrated services device network (ISDN)
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United States of America Patent
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Apr 17, 2001
Grant Date -
N/A
app pub date -
Nov 12, 1998
filing date -
Apr 24, 1997
priority date (Note) -
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Abstract
A RAM-based interrupt-driven interface device is disclosed for establishing a communication link between a universal serial bus (USB) host and a microcontroller device for providing a control function, the interface device being operative to receive digital information in the form of command, data and control packets from the host and to process the packets and communicate the processed digital information to the microcontroller device, and in response thereto, the microcontroller device being operative to communicate digital information to the interface device for processing and transfer thereof to the host. The interface device includes means for receiving a command generated by the host through a USB bus, means for storing the host-generated command and for generating an interface device interrupt signal upon storage of said host-generated command for use by the microcontroller device in responding to the host-generated command, a microcontroller bus for transferring microcontroller information and the interface device interrupt signal between the interface device and the microcontroller device. The interface device further includes means for receiving a microcontroller command from the microcontroller device in response to said interface device interrupt signal and means for storing the microcontroller command and it is operative to generate a microcontroller device interrupt signal upon storage of the microcontroller command for use by the interface device in developing an address for identification of the interface device to the host during subsequent communications therebetween, wherein during communication between the host and the interface device, the interface device-developed address is used by the interface device to identify host-provided information in the form of packets, and upon processing of the host-provided information, to provide the microcontroller device with the necessary information to allow it to respond to the host thereby allowing a generic microcontroller device to be flexibly interfaced with a USB, host for communication therebetween.
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