公开(公告)号：US11177896B2

公开(公告)日：2021-11-16

申请号：US16655261

申请日：2019-10-17

Applicant: ACCTON TECHNOLOGY CORPORATION

Inventor： Bang-Jun Tai ,  Yu-Yun Lee

IPC: H04J3/06

Abstract: A time synchronization device performs a time synchronization process with a device that provides first and second time values. The time synchronization device includes a packet processing circuit, a time counting circuit, and a processor. The packet processing circuit includes a timestamp counter having an N-bit length, and the packet processing circuit provides first to third time counting values. The processor calculates the first offset value based on the first and second time values and the first and second time counting values; calculates the first adjustment value based on the first offset value and the reciprocal of the frequency of the time counting circuit; calculates a second quotient value and a second remainder value based on the first adjustment value and the N-bit length; and calculates the receiving time of the second synchronization packet based on the N-bit length, the second quotient value, and the third time counting value.

公开(公告)号：US11664967B2

公开(公告)日：2023-05-30

申请号：US17444909

申请日：2021-08-11

Applicant: ACCTON TECHNOLOGY CORPORATION

Inventor： Bang-Jun Tai ,  Yu-Yun Lee

IPC: H04L7/00 ,  H04J3/06

CPC classification number: H04L7/0033 ,  H04J3/0667 ,  H04J3/0697 ,  H04L7/0091

Abstract: A network device adapted for sending a synchronization packet to a slave device. The synchronization packet includes a timestamp field and a correction field. The network device includes a counting circuit, a communication chip, and a processor. The counting circuit is configured to provide a calendar time TOD. The communication chip includes a first port, a second port, and a timestamp circuit which has a bit number N. The processor is coupled to the first port of the communication chip. The processor is configured to: obtain a remainder R according to the calendar time TOD and the bit number N; and write the calendar time TOD and the remainder R into the synchronization packet.