Apparatus and method for parallel and serial PCI hot plug signals
First Claim
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1. A circuit for a protocol having at least first and second different modes, comprising:
- 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.
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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
19 Claims
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1. 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 (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 (11, 12, 13, 14, 15)
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16. A method, comprising:
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convening signals in a first-mode 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 either the first mode or the second mode to a set of I/O pins in response to the control signal. - View Dependent Claims (17, 18, 19)
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Specification