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US 2006/0143338 A1Published application
Autodetection of a PCI express device operating at a wireless RF mitigation frequency
AssigneeIntel Corporation
InventorsMikal Hunsaker, Karthi Vadivelu, Andrew Martwick
Life of this patent
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Abstract
A computer system that detects for a PCI Express compliant endpoint device is described. Specifically, the computer system clocks transmit and receive circuits at a first frequency and initiates a training sequence. If the endpoint device successfully trains at the first frequency, the endpoint device is PCI Express compliant. Otherwise, the computer system initiates another training sequence at a second frequency.
Claims28
A computer system, comprising:
- a processor;
- and
- a chipset coupled to the processor, the chipset to support communication with a PCI Express compliant device at a first frequency, wherein the chipset is to communicate with a device at a second frequency, if the chipset fails to communicate with the device at the first frequency.
A computer system, comprising:
- a microprocessor;
- a controller hub coupled to the microprocessor;
- and
- a device wirelessly coupled to the controller hub;
- the controller hub having a root port with a transmitter and a receiver, wherein the root port attempts to identify bit transition edges and determine symbol boundaries at a first frequency of data communicated by the device, and wherein upon failing to identify bit transition edges and determine symbol boundaries at the first frequency, the root port steers the receiver to attempt to determine symbol boundaries at a second frequency.
2 more elements
An apparatus, comprising:
- a receive circuit interface to receive data;
- a receive physical layer coupled to the receive circuit interface to look for bit patterns;
- and
- a first state machine coupled to the receive physical layer to detect an endpoint device connected to the receive circuit interface.
1 more element
A method, comprising:
- transmitting data from a transmitter in a PCI Express port at a first frequency;
- clocking a receiver at the first frequency;
- attempting to lock onto specific bits within a bit-stream and to identify symbol boundaries within a bit pattern received by the receiver at a first frequency;
- and
- clocking the receiver at a second frequency, if the receiver does not lock onto specific bits within the bit-stream and the receiver does not identify symbol boundaries within the bit pattern after N attempts, wherein N is an integer greater than one.
2 more elements
Dependencies are inferred from the claim text.