Apparatus and method for granting concurrent ownership to...

Details Apparatus and method for granting concurrent ownership to... Apparatus and method for granting concurrent ownership to...

2006-11-28

2006-11-28

Ray, Gopal C. (Department: 2111)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

C710S107000, C710S111000, C370S462000

Reexamination Certificate

active

07143220

ABSTRACT:
A method and apparatus for supporting heterogeneous agents in on-chip busses. In one embodiment, the method includes the detection of a bus arbitration event between at least a first bus agent and a second bus agent. In one embodiment, a bus arbitration event is detected when at least the first bus agent and the second bus agent assert their respective bus request signals in a single clock cycle. Once a bus arbitration event is detected, bus ownership may be granted to both the first bus agent and the second bus agent, when the first bus agent and the second bus agent have different grant-to-valid latencies. In the embodiment, heterogeneous bus agents may coexist on a bus without requiring wasted or unused bus cycles following establishment of bus ownership. Other embodiments are described and claimed.

REFERENCES:
patent: 5253348 (1993-10-01), Scalise
patent: 6173349 (2001-01-01), Qureshi et al.
patent: 6393506 (2002-05-01), Kenny
patent: 6671761 (2003-12-01), Kim
patent: 2004/0205275 (2004-10-01), Bell et al.
“SAMBA-bus: a high performance bus architecture for system-on-chips” by Lu et al. (abstract only) Publication date: Nov. 9-13, 2003.

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