US 12,212,433 B2Granted

Method for communication between a first passive subscriber and a second passive subscriber of a bus system

AssigneeBeckhoff Automation GmbH

InventorsTim Kaulmann, Erik Vonnahme

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Abstract

A method is provided for communicating between passive subscribers of a bus system. A first passive subscriber encodes an original static pattern in a first transmit SERDES element and encodes original user data in a time-synchronized manner with the original static pattern in a second transmit SERDES element. The second passive subscriber receives the encoded static pattern and user data, and generates a sampling clock having a first phase offset and a clock synchronous with a transmit-receive clock having a second phase offset, from the encoded static pattern. The second passive subscriber decodes the encoded static pattern using a first receive SERDES element and the encoded user data, using a second receive SERDES element to obtain a receive data word. The first receive SERDES element and the second receive SERDES element are operated based on the sampling clock, and the receive data word is output synchronously with the synchronous clock.

Claims15

Dependent claims

A method for communicating between a first passive subscriber and a second passive subscriber of a bus system,

wherein a first differential double line and a second differential double line are used for the communication,
wherein an original static pattern with a predetermined bit length is transmitted via the first differential double line, wherein the original static pattern defines a transmit-receive clock,
wherein original user data are transmitted via the second differential double line, wherein the original user data comprise a transmit data word having the predetermined bit length,
wherein the first passive subscriber encodes the original static pattern in a first transmit SERDES element and transmits it via the first differential double line as an encoded static pattern to the second passive subscriber, and encodes the original user data synchronized in time with the original static pattern in a second transmit SERDES element and transmits it via the second differential double line to the second passive subscriber as encoded user data,
wherein the second passive subscriber receives the encoded static pattern and the encoded user data, wherein the second passive subscriber generates a sampling clock and a clock synchronous to the transmit-receive clock from the encoded static pattern,
wherein the sampling clock has a first phase offset with regard to the transmit-receive clock, wherein the synchronous clock has a second phase offset with regard to the transmit-receive clock,
wherein the second passive subscriber decodes the encoded static pattern with the aid of a first receive SERDES element and decodes the encoded user data with the aid of a second receive SERDES element, thus obtaining a receive data word, and
wherein the first receive SERDES element and the second receive SERDES element are operated based on the sampling clock, wherein the receive data word is output synchronously with the synchronous clock.

5 more elements

A second passive subscriber of a bus system, wherein the second passive subscriber comprises:

a first receive connection for a first differential double line,
a second receive connection for a second differential double line,
a first receive SERDES element, and
a second receive SERDES element;
wherein the second passive subscriber is configured to receive an encoded static pattern having a predetermined bit length via the first receive connection and to receive encoded user data having the predetermined bit length via the second receive connection,
wherein the second passive subscriber is configured to generate a sampling clock and a clock synchronous with a transmit-receive clock from the encoded static pattern, the sampling clock having a first phase offset with respect to the transmit-receive clock, the synchronous clock having a second phase offset with respect to the transmit-receive clock, and
wherein the second passive subscriber is configured to decode the encoded static pattern with the aid of the first receive SERDES element and to decode the encoded user data with the aid of the second receive SERDES element to obtain a receive data word;
wherein the first receive SERDES element and the second receive SERDES element are operable based on the sampling clock, and wherein the receive data word is output synchronously with the synchronous clock.

5 more elements

Dependencies are inferred from the claim text.