Method and apparatus for enabling multipoint bus access
First Claim
1. An apparatus for providing multipoint bus access, comprising:
- a boundary scan bus comprising a plurality of bus access points adapted for interfacing with a plurality of circuit packs including a master circuit pack;
a first termination circuit coupled to a first end of said boundary scan bus; and
a second termination circuit coupled to a second end of said boundary scan bus;
said first termination circuit and said second termination circuit adapted for terminating signaling on said boundary scan bus in a manner enabling disposal of said master circuit pack at any of said plurality of bus access points.
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Abstract
The invention includes a method and apparatus for enabling multipoint bus access. In one example, the open ring-architecture bus includes a boundary scan bus including a plurality of bus access points adapted for interfacing with a plurality of circuit packs, a first termination circuit coupled to a first end of the bus, and a second termination circuit coupled to a second end of the bus. The first termination circuit and second termination circuit are adapted for terminating signaling on the boundary scan bus. The open-ring architecture bus provides a master circuit pack a multipoint access capability such that the master circuit pack may be disposed at any of the plurality of bus access points. In one example, signaling includes signaling operable for performing hierarchical system testing, including boundary scan testing. In another example, signaling includes upgrade signaling operable for performing firmware upgrades, software upgrades, and like circuit pack upgrades.
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Citations
20 Claims
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1. An apparatus for providing multipoint bus access, comprising:
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a boundary scan bus comprising a plurality of bus access points adapted for interfacing with a plurality of circuit packs including a master circuit pack;
a first termination circuit coupled to a first end of said boundary scan bus; and
a second termination circuit coupled to a second end of said boundary scan bus;
said first termination circuit and said second termination circuit adapted for terminating signaling on said boundary scan bus in a manner enabling disposal of said master circuit pack at any of said plurality of bus access points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15)
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10. An method for providing multipoint bus access, comprising:
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providing a boundary scan bus comprising a plurality of bus access points adapted for interfacing with a plurality of circuit packs including a master circuit pack;
terminating a first end of said boundary scan buss using a first termination circuit; and
terminating a second end of said boundary scan buss using a second termination circuit;
said first termination circuit and said second termination circuit adapted for terminating signaling on said boundary scan bus in a manner enabling disposal of said master circuit pack at any of said plurality of bus access points. - View Dependent Claims (11, 12, 13, 14, 17, 18)
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16. The method of claim 16, wherein said master circuit pack comprises at least one of a control (CTL) card, a debug (DEBUG) card, and a card adapted for interfacing with a rear side of a backplane.
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19. A system for providing multipoint bus access, comprising:
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a plurality of circuit packs including a master circuit pack;
a boundary scan bus comprising a plurality of bus access points adapted for interfacing with said plurality of circuit packs;
a first termination circuit coupled to a first end of said boundary scan bus; and
a second termination circuit coupled to a second end of said boundary scan bus;
said first termination circuit and said second termination circuit adapted for terminating signaling on said boundary scan bus in a manner enabling disposal of said master circuit pack at any of said plurality of bus access points. - View Dependent Claims (20)
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Specification