Deadlock avoidance in a bus fabric

Details Deadlock avoidance in a bus fabric Deadlock avoidance in a bus fabric

2007-02-12

2008-08-26

Shin, Christopher (Department: 2181)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus interface architecture

C710S311000, C710S023000, C710S005000, C710S033000, C710S052000, C711S141000, C711S154000, C711S169000

Reexamination Certificate

active

07418537

ABSTRACT:
Circuits, apparatus, and methods for avoiding deadlock conditions in a bus fabric. One exemplary embodiment provides an address decoder for determining whether a received posted request is a peer-to-peer request. If it is, the posted request is sent as a non-posted request. A limit on the number of pending non-posted requests is maintained and not exceed, such that deadlock is avoided. Another exemplary embodiment provides an arbiter that tracks a number of pending posted requests. When the number pending posted requests reaches a predetermined or programmable level, a Block Peer-to-Peer signal is sent to the arbiter's clients, again avoiding deadlock.

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