Low-cost port synchronization method in multiport Ethernet devices

摘要

A method for frequency synchronization of a multiport device may include recovering a clock frequency of a master port of a first device that is linked to the multiport device at a slave port of the multiport device. A clock frequency of the slave port may be locked to the recovered-clock frequency of the master port of the first device. Frequency data may be stored in a first frequency register associated with the slave port. The stored frequency data may include a difference between the recovered-clock frequency of the master port of the first device and a local-clock frequency of the multiport device. A clock frequency of one or more master ports of the multiport device may be synchronized with the locked clock frequency of the slave port by coupling the first frequency register to frequency registers associated with one or more master ports.

主权项

1. A method for frequency synchronization of a multiport device, the method comprising:
recovering a clock frequency of a master port of a first device linked to the multiport device at a slave port of the multiport device; locking a clock frequency of the slave port to the recovered-clock frequency of the master port of the first device; storing, in a first frequency register associated with the slave port, frequency data; and synchronizing a clock frequency of at least one master port of the multiport device with the locked clock frequency of the slave port by coupling the first frequency register to a second frequency register associated with at least one master port, wherein the stored frequency data is indicative of a difference between the recovered-clock frequency of the master port of the first device and a local-clock frequency of the multiport device.