Multi-master and diverse serial bus in a complex electrical system
First Claim
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1. A system comprising:
- a master control processor;
a bus controller connected to the master control processor and implementing a serial bus interface between the master control processor and a plurality of serial bus devices, the master control processor and the bus controller being on a first circuit board;
a midplane connected to the bus controller on the first circuit board; and
a plurality of additional circuit boards connected to the serial bus interface through the midplane, each of the plurality of additional circuit boards includingone or more of the serial bus devices,a switch configured to electrically connect the circuit board corresponding to the switch to the first circuit board through the serial bus interface when the switch is controlled to be in a first state and to electrically isolate the circuit board corresponding to the switch from the serial bus interface on the first circuit board when the switch is controlled to be in a second state, andlocal control logic for outputting a signal for controlling the state of the switch, the local control logic controlling the switch to be in the first state when the switches on each of the other of the plurality of additional circuit boards are in the second state.
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Abstract
A two wire serial bus is connected between different circuit boards in a complex electrical system. The two wire serial bus may be used to receive status information about each of the circuit boards in the system. A master control processor on one of the circuit boards controls which of the other circuit boards are active on the serial bus. Each of the non-master circuit boards includes a series of switches that electrically isolate or connect portions of the two wire serial bus from one another. Through the series of switches, both the master control processor and processors local to each of the other circuit boards may simultaneously access different portions of the serial bus.
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Citations
24 Claims
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1. A system comprising:
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a master control processor; a bus controller connected to the master control processor and implementing a serial bus interface between the master control processor and a plurality of serial bus devices, the master control processor and the bus controller being on a first circuit board; a midplane connected to the bus controller on the first circuit board; and a plurality of additional circuit boards connected to the serial bus interface through the midplane, each of the plurality of additional circuit boards including one or more of the serial bus devices, a switch configured to electrically connect the circuit board corresponding to the switch to the first circuit board through the serial bus interface when the switch is controlled to be in a first state and to electrically isolate the circuit board corresponding to the switch from the serial bus interface on the first circuit board when the switch is controlled to be in a second state, and local control logic for outputting a signal for controlling the state of the switch, the local control logic controlling the switch to be in the first state when the switches on each of the other of the plurality of additional circuit boards are in the second state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A network device in a computer network comprising:
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a routing engine for consolidating routing information learned from routing protocols in the network; and a packet forwarding engine connected to the routing engine, the packet forwarding engine including a midplane; a first circuit board having a master control processor; and a plurality of second circuit boards each having a control processor, the first and second circuit boards being electrically coupled through the midplane via a serial control bus, the second circuit boards each additionally including a switch configured to electrically connect the second circuit board to the first circuit board via the serial control bus when the switch is controlled to be in a first state and to electrically isolate the second circuit board from the serial control bus when the switch is controlled to be in a second state, the switch of a particular one of the second circuit boards being in the first state only when the switches on each of the other of the second circuit boards are in the second state. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A circuit board comprising:
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a first switch for selectively connecting or disconnecting a first portion of a two wire serial bus from an external circuit board to a second portion of the two wire serial bus; a second switch for selectively connecting or disconnecting the second portion of the two wire serial bus to a third portion of the two wire serial bus; a third switch for selectively connecting or disconnecting the third portion of the two wire serial bus to a fourth portion of the two wire serial bus; a local processor; a bus controller interfacing the local processor to the fourth portion of the two wire serial bus; and a local control logic circuit connected to receive control information from the external circuit board and the local processor and control the first, second, and third switches based on the received control information. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification