Bus reset management by a primary controller card of multiple controller cards
AssigneeHewlett-Packard Development Company, L.P.
InventorsAnthony J Benson, James Lawrence White, Dovard K Howard
Life of this patent
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Abstract
A communication system has multiple communication buses and multiple bus controller cards each supplying at least two independent channels of communication between one or more hosts and the communication buses. One of the controller cards is designated as a primary controller card for managing the communication buses and resetting the communication buses such that if a controller card is inserted to or removed from the system then the buses are reset.
Claims20
A communications system comprising:
- first and second communication buses implemented on a backplane;
- and
- first and second controller cards for providing an independent channel of communication between one or more hosts and said first and second communication buses;
- each controller card comprising:
- a controller;
- a first backplane connector connected to said controller and adapted for connection to the first communication bus;
- and
- a second backplane connector connected to said controller and adapted for connection to the second communication bus,
- wherein one of the first or second controller cards is designated as the primary controller card to generate reset signals to reset the first and second communication buses such that:
- if a controller card is inserted to or removed from the system then the first communication bus and the second communication bus are reset.
In a communication system comprising first and a second communication buses, and first and second bus controller cards each providing for at least two independent channels of communication between one or more hosts and said first and second communication buses, one of said first or second controller cards being designated as the primary controller card for managing the first and second communication buses and resetting said first and second communication buses such that:
- if a controller card is inserted to or removed from the system then the first and the second communication buses are reset.
A communications system having a bus controller system, comprising:
- first and second buses;
- and
- first and second controller cards connected to said first and second buses;
- each controller card comprising:
- a controller;
- first and second independent means of communication for one or more hosts to communicate with said first and second communication buses;
- and
- bridging means for providing a second independent means of communication between said one or more hosts and said first and second communication buses,
- wherein one of the first or second controller cards is designated as the primary controller card to generate reset signals to reset the first and second communication buses such that:
- if a controller card is inserted to or removed from the system then the first communication bus and the second communication bus are reset;
- if a peripheral device is inserted to or removed from the first bus then if the first controller card has primary status then if the first and second buses are bridged then the first and the second buses are reset;
- if the first and second buses are isolated then the first bus is reset;
- if a peripheral device is inserted to or removed from the second bus then if the second controller card has primary status then if the first and second buses are bridged then the first and the second buses are reset;
- and
- if the first and second buses are isolated then the second bus is reset.
Dependencies are inferred from the claim text.