Methods and structure for preserving lock signals on...

Details Methods and structure for preserving lock signals on... Methods and structure for preserving lock signals on...

2006-03-14

2006-03-14

Vo, Tim (Department: 2112)

Electrical computers and digital data processing systems: input/

Access locking

C711S149000, C711S152000, C710S108000

Reexamination Certificate

active

07013356

ABSTRACT:
Structure and methods for preserving lock requests by master devices on multiple buses each coupled to a port of a multiported device. The invention provides for arbitration among multiple ports of a multiported device to preserve the intent of a lock request to retain exclusive control of the bus over an extended period involving multiple bus transactions directed through a corresponding port. In a first exemplary preferred embodiment, an AMBA AHB compliant bus bridge or multiported slave device is coupled through its ports to multiple AHB buses each having one or more master devices coupled thereto. Logic circuits and methods associated with port arbitration for the bus bridge device or multiported slave device preserve the intent of HLOCK requests asserted by master devices on one of the AHB buses coupled to a port to preserve the intent of the lock request through port arbitration within the multiported device.

REFERENCES:
patent: 4698753 (1987-10-01), Hubbins et al.
patent: 5206833 (1993-04-01), Lee
patent: 6282583 (2001-08-01), Pincus et al.
patent: 6442642 (2002-08-01), Brooks
patent: 12016 (1980-06-01), None
patent: 08006905 (1996-01-01), None

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