Method and apparatus to synchronize a bus bridge to a master clock
AssigneesSony Corporation, Sony Electronics Inc.
InventorsDavid Vernon James, Bruce Fairman, Glen David Stone
Life of this patent
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Abstract
A method and apparatus for synchronizing a bus bridge to a master clock comprising receiving a time stamp packet at an input clock register of the bus bridge, comparing the value of the input clock register to the value of an output clock register of the bus bridge, obtaining an error value of the output clock register from the comparison, and determining whether the error value is below a predetermined threshold are described.
Claims20
A method for synchronizing a bus bridge to a master clock comprising:
- receiving a time stamp packet at an input clock register of the bus bridge;
- comparing the value of the input clock register to the value of an output clock register of the bus bridge;
- obtaining an error value of the output clock register from the comparison;
- and
- determining whether the error value is below a predetermined threshold.
An apparatus for synchronizing a bus bridge to a master clock comprising:
- an input clock register to receive a first time stamp packet;
- an output clock register to output a second time stamp packet;
- a direction calculator to compare the first time stamp packet to the second time stamp packet and to output a direction of an error of the second time stamp packet;
- an absolute value calculator to receive the direction of the error and to output an absolute value of the error;
- and
- a threshold comparator to determine whether the error is below a predetermined threshold.
An apparatus for synchronizing a bus bridge to a master clock comprising:
- means for receiving a time stamp packet at an input clock register of the bus bridge;
- means for comparing the value of the input clock register to the value of an output clock register of the bus bridge;
- means for obtaining an error value of the output clock register from the comparison;
- and
- means for determining whether the error value is below a predetermined threshold.
Dependencies are inferred from the claim text.