Abstract: An apparatus for and method of transmitting and synchronizing isochronous data on a USB endpoint pipe are disclosed. Also disclosed are a double buffering capability, a transmission delay capability, a synchronization capability, and a clock adjustment capability.

Abstract: A method and apparatus for performing a control transfer on a Universal Serial Bus (USB) device. A USB device includes a memory space for reading and writing data transmitted over a USB network. The memory space is shared between a plurality of endpoints. A host initiates a control transfer by transmitting a SETUP token to a first endpoint. The endpoint must accept the SETUP token. If the first endpoint does not expect the SETUP token, or if another endpoint is active, the device stores the token until a buffer is allocated and the first endpoint is made active.

Abstract: An apparatus for an method of sending and receiving data on a Universal Serial Bus using a memory shared among a number of end points are disclosed. The memory is a double buffer which allows the next packet to be prepared while the current packet is being transmitted. The invention also supports transmission retry.

Abstract: A method and apparatus for providing a programming interface to a Universal Serial Bus Device. The programming interface is partitioned so that an external controller does not handle intermediate transfers such as packet retry, handshake packets or intermediate response to error conditions. The programming model consists of a number of endpoint pipes, each of which can be configured to provide one of several functions.

Abstract: An apparatus for an method of sending and receiving data on a Universal Serial Bus using a memory shared among a number of endpoints are disclosed. The memory is a double buffer which allows the next packet to be prepared while the current packet is being transmitted. The invention also supports transmission retry.

Abstract: A method and apparatus for dynamically configuring a USB device. The USB device includes a plurality of mappings for relating a received token to an endpoint pipe. The mappings are configured at initialization, and are dynamically selected during operation of a USB network.

Abstract: An apparatus for and method of controlling a versatile USB endpoint pipe are disclosed. The USB endpoint pipe can be in various states which are determined by control commands. The control commands also determine the endpoint pipe type.

Abstract: A Universal Serial Bus hub circuit includes an upstream port and a plurality of downstream ports. The hub circuit further includes input circuitry via which data received on one of the downstream ports is to be repeated to the upstream port. Asynchronous event detection circuitry is to detect an asynchronous event in the received data for the one downstream port. Port selection circuitry to select the one downstream port. Timer circuitry is to measure a time period from a time that the asynchronous event detection circuitry detects an asynchronous event. Synchronous event detection circuitry is to detect a synchronous event in the received data for the one port. End-of-event generation circuitry generates a simulated end-of-event signal if the detected synchronous event is not before the end of the measured time period, and provides the simulated end-of-event signal to the upstream port.