Token exchange system with fault protection

Details Token exchange system with fault protection Token exchange system with fault protection

2005-04-19

2005-04-19

Phunkulh, Bob A. (Department: 2732)

Multiplex communications

Fault recovery

Bypass an inoperative switch or inoperative element of a...

C370S450000, C709S251000, C714S724000

Reexamination Certificate

active

06882620

ABSTRACT:
According to one embodiment, a system for controlling passing of a token among a plurality of clients that access a shared resource includes at least one controller. The at least one controller is configured to cause the token to be passed to each of the plurality of clients when the system is in a first state, and to cause the token to be passed to fewer than all of the plurality of clients when the system is in a second state. According to another embodiment, a token-ring system includes a shared resource, at least first and second clients that access the shared resource, and error detection logic. The first client includes a primary device and a secondary device which provides bootstrap information to the primary device. The error detection is configured to directly monitor the secondary device for an anomaly in the operation thereof. According to yet another embodiment, a method is disclosed for operating a multi-port memory including at least first and second memory ports that access a shared memory. The first memory port includes a primary device and a secondary device which provides bootstrap information to the primary device. The method includes steps of: (a) permitting each of the first and second memory ports to access the memory when it is in possession of a token, and (b) continuously monitoring the secondary device for an anomaly in operation thereof.

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