Master-slave communication bus controllers
First Claim
1. A communications system comprising:
- one or more communication buses implemented on a backplane having one or more interface slots;
one or more controller cards communicating with the communication buses through said one or more interface slots, each controller card comprising;
a controller; and
at least two independent communication channels provided for connecting a host with said one or more communication buses, wherein the controller determines and designates the status of said one or more controller cards such that a first controller card is designated to have primary status if the first controller card is inserted in a first interface slot while remaining interface slots are empty.
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Accused Products
Abstract
A communication system with a plurality of interface slots includes control logic for determining and designating the status of one or more controller cards inserted in one of the slots such that: a controller card is designated as the primary card if it is inserted in an interface slot while the other slots are empty; a controller card in an interface slot with primary status retains its primary status while other controller cards are added or removed from the system; a controller card in an interface slot with a non-primary status assumes primary status if the controller card with non-primary status is plugged in a slot that after a power interruption is designated as the slot to assume primary status, or the controller card with primary status is removed from the system.
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Citations
20 Claims
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1. A communications system comprising:
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one or more communication buses implemented on a backplane having one or more interface slots;
one or more controller cards communicating with the communication buses through said one or more interface slots, each controller card comprising;
a controller; and
at least two independent communication channels provided for connecting a host with said one or more communication buses, wherein the controller determines and designates the status of said one or more controller cards such that a first controller card is designated to have primary status if the first controller card is inserted in a first interface slot while remaining interface slots are empty. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20)
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19. A communications system with a plurality of interface slots, said system including control logic that determines and designates the status of one or more controller cards inserted in said one or more slots such that:
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a first controller card is designated to have primary status if the first controller card is inserted in a first interface slot while the other interface slots are empty;
the first controller card in said first slot retains primary status while one or more controller cards are added or removed from said remaining slots; and
a second controller card having non-primary status inserted in a second interface slot assumes primary status after a power interruption, if the second interface slot is designated as the slot to assume primary status after a power interruption.
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Specification