Method and apparatus for arbitrating requests at two or more lev

Details Method and apparatus for arbitrating requests at two or more lev Method and apparatus for arbitrating requests at two or more lev

1995-09-06

1998-09-08

Harvey, Jack B.

395729, 395861, 395477, 395478, G06F 1314

Patent

active

058059059

ABSTRACT:
Method and apparatus for arbitrating for a shared resource among two or more devices, wherein one device can arbitrate at two or more different levels of priority at different times. Only two conductors are used to communicate between the device and the arbiter: one request signal line and one grant signal line. In order to assert a request for control of memory, the device brings the request signal line to a predefined logic level. The arbiter considers this a low priority request for control of the shared resource, and the arbitration proceeds accordingly. Then, if the device's request is a high priority request, or if it was originally a low priority request and has now become a high priority request, the device brings the request signal to the opposite logic level to thereby increase the priority level of its request. In either case, the arbiter grants control of the shared resource by asserting the device grant signal to the device. Only two wires are required for the dual priority device to participate in the arbitration.

REFERENCES:
patent: 4641266 (1987-02-01), Walsh
patent: 5146596 (1992-09-01), Whittaker et al.
patent: 5276887 (1994-01-01), Haynie
patent: 5398244 (1995-03-01), Mathews et al.
patent: 5440698 (1995-08-01), Sindhu et al.
patent: 5448742 (1995-09-01), Bhattacharya
patent: 5560016 (1996-09-01), Fiebrich et al.
patent: 5572655 (1996-11-01), Tuljapurkar et al.
PCI Special Interest Group, "PCI Local Bus Specification", Revision 2.0 (Apr. 30, 1993).

Affiliated with

Also associated with

Rating

Method and apparatus for arbitrating requests at two or more lev does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for arbitrating requests at two or more lev, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for arbitrating requests at two or more lev will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1294479