公开(公告)号：US10298345B2

公开(公告)日：2019-05-21

申请号：US15406350

申请日：2017-01-13

Applicant: GLOBALFOUNDRIES INC.

Inventor： Kai Yang ,  Bin Sun ,  Yuan Yao ,  Zhen Han

IPC: H04J3/06

Abstract: Aspects of the present disclosure includes a method and program product for clock synchronization of a networked computer system. The method records a time (t1) when a first codeword marker in a datastream is sent from a master computer to a slave computer and records a second time (t2) when the slave computer receives the first codeword marker. The method includes recording a third time (t3) when a third codeword marker in a datastream is sent from the slave computer to the master computer. The method includes recording a fourth time t4 when the master receives the third codeword marker from the slave. The method calculates a time offset θ, according to; θ = ( t ⁢ ⁢ 2 - t ⁢ ⁢ 1 ) + ( t ⁢ ⁢ 4 - t ⁢ ⁢ 3 ) 2 , and a roundtrip delay δ, according to δ=(t4−t1)−(t3−t2). The clock in the slave computer is synchronized with a clock in the master computer using θ and δ.

公开(公告)号：US20180205477A1

公开(公告)日：2018-07-19

申请号：US15406350

申请日：2017-01-13

Applicant: GLOBALFOUNDRIES INC.

Inventor： Kai Yang ,  Bin Sun ,  Yuan Yao ,  Zhen Han

IPC: H04J3/06

CPC classification number: H04J3/0667

Abstract: Aspects of the present disclosure includes a method and program product for clock synchronization of a networked computer system. The method records a time (t1) when a first codeword marker in a datastream is sent from a master computer to a slave computer and records a second time (t2) when the slave computer receives the first codeword marker. The method includes recording a third time (t3) when a third codeword marker in a datastream is sent from the slave computer to the master computer. The method includes recording a fourth time t4 when the master receives the third codeword marker from the slave. The method calculates a time offset θ, according to; θ = ( t   2 - t   1 ) + ( t   4 - t   3 ) 2 , and a roundtrip delay δ, according to δ=(t4−t1)−(t3−t2). The clock in the slave computer is synchronized with a clock in the master computer using θ and δ.

公开(公告)号：US10784976B2

公开(公告)日：2020-09-22

申请号：US16196970

申请日：2018-11-20

Applicant: GLOBALFOUNDRIES Inc.

Inventor： Kai Yang ,  Adrian Butter ,  Bin Sun ,  Yijian Qi ,  Jilei Yin

IPC: H04J3/06

Abstract: A system and apparatus for obtaining clock synchronization of networked devices and related method are provided. Embodiments include a computer-implemented system, including a primary device having a first high accuracy timestamping assist (HATA) unit attached to a first physical layer; a first time stamping unit; a first clock control; a first medium access control layer connected to the first time stamping unit and the first physical layer via a medium independent interface. A secondary device includes a second HATA unit attached to a second physical layer; a second timestamping unit; a second clock control. The first and second HATA units are configured to detect a departure time, an arrival time, or a combination thereof of a first alignment marker over transmitter serializer and receiver deserializer interfaces of a data transmission between the primary device and the secondary device.

公开(公告)号：US10104148B2

公开(公告)日：2018-10-16

申请号：US15397028

申请日：2017-01-03

Applicant: GLOBALFOUNDRIES INC.

Inventor： Kai Yang ,  Adrian Butter ,  Bin Sun ,  Bin Yu

IPC: H04L12/40 ,  H04L29/06 ,  H04L1/00 ,  H04L29/08 ,  H04L12/64

Abstract: In methods, systems, and devices, master and slave node timestamp synchronization units identify a node start frame delimiter of a time protocol message on transmission medium by matching patterns in the time protocol message to known start frame delimiter patterns. Master and slave node processors of such timestamp synchronization units capture a corresponding node clock time at which the node start frame delimiter is identified by referring to a corresponding node clock signal while each is identifying the node start frame delimiter. The master and slave node processors perform compensation of the node clock time by making adjustments to the node clock time for known time latency. The master and slave node timestamp synchronization units then output the node clock time as timestamps to corresponding timestamp units.

公开(公告)号：US20180191802A1

公开(公告)日：2018-07-05

申请号：US15397028

申请日：2017-01-03

Applicant: GLOBALFOUNDRIES INC.

Inventor： Kai Yang ,  Adrian Butter ,  Bin Sun ,  Bin Yu

IPC: H04L29/06 ,  H04L1/00

CPC classification number: H04L65/608 ,  H04L1/0018 ,  H04L69/323 ,  H04L2012/6454

Abstract: In methods, systems, and devices, master and slave node timestamp synchronization units identify a node start frame delimiter of a time protocol message on transmission medium by matching patterns in the time protocol message to known start frame delimiter patterns. Master and slave node processors of such timestamp synchronization units capture a corresponding node clock time at which the node start frame delimiter is identified by referring to a corresponding node clock signal while each is identifying the node start frame delimiter. The master and slave node processors perform compensation of the node clock time by making adjustments to the node clock time for known time latency. The master and slave node timestamp synchronization units then output the node clock time as timestamps to corresponding timestamp units.