Method and apparatus for monitoring universal serial bus activit

Details Method and apparatus for monitoring universal serial bus activit Method and apparatus for monitoring universal serial bus activit

1998-03-19

2000-09-12

Auve, Glenn A.

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

713310, G06F 1300

Patent

active

061191949

ABSTRACT:
A USB host controller provides transaction type status signals indicating USB activity type. The status signals include a bulk status bit signal indicative of bulk activity on a USB, a control status bit signal indicative of control activity on the USB, an isochronous status bit signal indicative of isochronous activity on the USB and an interrupt status bit signal indicative of an acknowledged interrupt on the USB. In addition a programmable mask register is provided for masking any or all of the status bits. The status bits may be combined and provided as a single signal indicative of USB activity.

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Advanced Micro Devices, Inc., "AMD-645 Peripheral Bus Controller Data Sheet", 1997 pp. 1-1 thru 12-2, particularly pp. 1-4 and 2-6.
White Paper "USB--APM Interactions", Intel Corporation, 1997, pp. 1-5.
OpenHC "Open Host Controller Interface Specification for USB", Compaq, Microsoft, National Semiconductor, Jul. 8, 1997, Release 1.0a, pp. ii-152.
"Universal Serial Bus Specification", Compaq, Digital Equipment Corp., IBM PC Company, Intel, Microsoft, NEC, Northern Telecom, Jan. 15, 1996, Revision 1.0, pp. 1-268 and specifically chapters 3-5 and 8-10.

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