Increasing the availability of the universal serial bus intercon

Details Increasing the availability of the universal serial bus intercon Increasing the availability of the universal serial bus intercon

1997-10-02

1999-05-11

Shin, Christopher B.

Pulse or digital communications

Repeaters

Testing

395883, 375211, G06F13/00

Patent

active

059037776

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.

REFERENCES:
patent: 5566203 (1996-10-01), Brief et al.
patent: 5675813 (1997-10-01), Holmdahl
patent: 5742587 (1998-04-01), Zoring et al.
patent: 5784581 (1998-07-01), Hannah
patent: 5799196 (1998-08-01), Flannery
patent: 5819051 (1998-10-01), Murray et al.
Compaq Computer Corporation, Digital Equipment Corporation, IBM PC Company, Intel Corporation, Microsoft Corporation, NEC, Northern Telecom, Proposal for Universal Serial Bus Specification, rev. 1.0, (Jan. 15, 1996).

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