Apparatus and method for parallel and serial PCI hot plug signals
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Abstract
A method and apparatus are provided for operating a hot plug system. A first device may determine whether the system is to operate in one of a parallel mode or a serial mode. A second device may control a mode of the chipset based on the determination of the first device. The second device may include logic, a first multiplexer, a second multiplexer, a first converter and a second converter all provided on the chipset.
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Citations
40 Claims
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1-21. -21. (canceled)
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22. A circuit for a protocol having at least first and second different modes, comprising:
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first interface logic for one of the modes;
a single set of I/O pins to transfer signals in either of the modes to external devices, at least some of the same pins changing their function in different ones of the modes;
converters to convert the modes to each other;
multiplexers to selectively couple the pins to the first interface logic either directly or through the converters;
second interface logic for the other of the modes, the second interface logic being adapted to produce a signal to control the selective coupling. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A system, comprising:
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a processor;
a bus coupled to the processor;
a circuit coupled to the bus to transfer data to and from the bus according to a protocol that has both parallel and serial modes, the circuit comprising first interface logic for one of the modes;
a single set of I/O pins for transferring signals in either of the modes to external devices, at least some of the same pins changing their function in different ones of the modes;
converters for converting the modes to each other;
multiplexers for selectively coupling the pins to the first interface logic either directly or through the converters;
second interface logic for the other of the modes, the second interface logic being adapted to produce a signal to control the selective coupling. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A method, comprising:
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coupling signals in a first mode of a designated protocol to a set of I/O pins for connection to a device;
converting the first-mode signals to a second mode of the same designated protocol;
producing a control signal in the second mode of the designated protocol;
selectively coupling the signals in the second mode to the same set of I/O pins in response to the control signal. - View Dependent Claims (38, 39, 40)
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Specification