Printed circuit board having conductors which can be decoupled for isolating intactive integrated circuits connected thereto
First Claim
1. A printed circuit board comprising:
- an edge connector configured to be coupled to an expansion bus;
an integrated circuit mounted on the printed circuit board, the integrated circuit coupled to the edge connector and operable to snoop memory operations on the expansion bus and cause selected memory data to be stored in a memory on the printed circuit board;
a first power conductor extending across a first portion of said printed circuit board, the first power conductor coupled to the integrated circuit;
a second power conductor extending across a second portion of said printed circuit board, the second power conductor coupled to the integrated circuit; and
a decoupling unit connected between said first power conductor and said integrated circuit, wherein said decoupling unit causes said first power conductor to be decoupled from said integrated circuit during times in which voltage within said first power conductor is less than voltage within said second power conductor.
2 Assignments
0 Petitions
Accused Products
Abstract
A printed circuit board includes an edge connector operable to be coupled to an expansion bus. An integrated circuit is mounted on the printed circuit board and is coupled to the edge connector. The integrated circuit is operable to snoop memory operations on the expansion bus and cause selected memory data to be stored in a memory on the printed circuit board. A first power conductor extends across a first portion of the printed circuit board and is coupled to the integrated circuit. A second power conductor extends across a second portion of the printed circuit board and is also coupled to the integrated circuit. The circuit board also includes a decoupling unit connected between the first power conductor and the second power conductor. The decoupling unit causes disconnect of the first power conductor from the second power conductor during times in which voltage within the first power conductor is less than voltage within the second power conductor.
44 Citations
24 Claims
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1. A printed circuit board comprising:
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an edge connector configured to be coupled to an expansion bus; an integrated circuit mounted on the printed circuit board, the integrated circuit coupled to the edge connector and operable to snoop memory operations on the expansion bus and cause selected memory data to be stored in a memory on the printed circuit board; a first power conductor extending across a first portion of said printed circuit board, the first power conductor coupled to the integrated circuit; a second power conductor extending across a second portion of said printed circuit board, the second power conductor coupled to the integrated circuit; and a decoupling unit connected between said first power conductor and said integrated circuit, wherein said decoupling unit causes said first power conductor to be decoupled from said integrated circuit during times in which voltage within said first power conductor is less than voltage within said second power conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A computer system comprising:
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a CPU; system memory coupled to the CPU; an expansion bus; a plurality of devices coupled to the expansion bus; a bus interface unit coupled to the expansion bus, the CPU sending signals to the devices coupled to the expansion bus through the bus interface unit; a circuit board coupled to the expansion bus, the circuit board comprising; a processor operable to snoop memory operations on the expansion bus and cause selected memory data to be stored in a memory on the printed circuit board; a first power conductor extending across a first portion of said printed circuit board, the first power conductor coupled to the processor; a second power conductor extending across a second portion of said printed circuit board, the second power conductor coupled to the processor; and a decoupling unit connected between said first power conductor and said second power conductor, wherein said decoupling unit causes disconnect of said first power conductor from said second power conductor during times in which voltage within said first power conductor is less than voltage within said second power conductor. - View Dependent Claims (17, 18, 19)
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20. A computer system comprising:
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a CPU; system memory coupled to the CPU; an expansion bus; a graphics processor coupled to the expansion bus; a bus interface unit coupled to the expansion bus, the CPU sending video signals to the graphics processor through the bus interface unit; a second processor coupled to the expansion bus, the second processor operable to snoop the video signals from the expansion bus; a power source operable to provide power to the second processor and at least one of the CPU, the graphics processor, the bus interface unit; a detection circuit coupled to the power source, the detection circuit operable to determine that the power source is not supplying power; a battery coupled to the second processor, the battery operable to provide power to the second processor but not to the CPU, the graphics processor and the bus interface unit in response to a signal from the detection circuit. - View Dependent Claims (21, 22, 23, 24)
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Specification