US 12,047,198 B2Granted

Controller area network data link layer protocol processing system, related integrated circuit, device and method

AssigneeStmicroelectronics Application GmbH

InventorsFred Rennig, Rolf Nandlinger

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Abstract

A device has a plurality of CAN XL communication systems, a bus, and a switching circuit. The bus has a transmission node and reception node, and receives from each CAN XL communication system a respective second transmission signal and drives the logic level at the transmission node as a function of the logic levels of the second transmission signals, and provides to each CAN XL communication system a respective second reception signal having a logic level determined as a function of the logic level at the reception node. The switching circuit supports a plurality of modes. In a first mode, the switching circuit is configured to provide the NRZ encoded transmission signals of the CAN XL communication systems as the second transmission signals to the bus system, and provide the respective second reception signal received from the bus to the CAN XL protocol controllers of the CAN XL communication system.

Claims20

Dependent claims

A device, comprising:

a plurality of controller area network data link layer protocol (CAN XL) communication systems, which, in operation:
generate respective non-return-to-zero (NRZ) encoded transmission signals, the respective NRZ encoded transmission signals having respective bit rates of a plurality of bit rates;
receive respective NRZ encoded reception signals;
when the respective NRZ encoded transmission signal has a determined bit rate of the plurality of bit rates, generate respective pulse-width modulated (PWM) signals having duty cycles based on respective values of the respective NRZ encoded transmission signals;
and
generate respective first transmission signals by selecting:
the respective NRZ encoded transmission signal when the respective NRZ encoded transmission signal has a bit rate different from the determined bit rate;
and
the respective PWM signal when the respective NRZ encoded transmission signal has the determined bit rate;
a bus having a transmission node and a reception node and coupled to the plurality of CAN XL communication systems;
and
switching circuitry having a plurality of switching modes and coupled to the bus and to the plurality of CAN XL communication systems, wherein:
the bus, in operation, receives respective second transmission signals from the plurality of CAN XL communication systems and drives a logic level at the transmission node as a function of logic levels of the respective second transmission signals;
and
in a first switching mode of operation:
the switching circuitry provides the respective NRZ encoded transmission signals to the bus as the respective second transmission signals;
and
the bus provides respective second reception signals to the plurality of CAN XL communication systems via the switching circuitry, the respective second reception signals having a logic level based on a logic level of the reception node of the bus.

15 more elements

A system, comprising:

a first processing device;
and
a second processing device coupled to the first processing device, the second processing device including:
a plurality of controller area network data link layer protocol (CAN XL) communication systems, which, in operation:
generate respective non-return-to-zero (NRZ) encoded transmission signals, the respective NRZ encoded transmission signals having respective bit rates of a plurality of bit rates;
receive respective NRZ encoded reception signals;
when the respective NRZ encoded transmission signal has a determined bit rate of the plurality of bit rates, generate respective pulse-width modulated (PWM) signals having duty cycles based on respective values of the respective NRZ encoded transmission signals;
and
generate respective first transmission signals by selecting:
the respective NRZ encoded transmission signal when the respective NRZ encoded transmission signal has a bit rate different from the determined bit rate;
and
the respective PWM signal when the respective NRZ encoded transmission signal has the determined bit rate;
a bus having a transmission node and a reception node and coupled to the plurality of CAN XL communication systems;
and
switching circuitry having a plurality of switching modes and coupled to the bus and to the plurality of CAN XL communication systems, wherein:
the bus, in operation, receives respective second transmission signals from the plurality of CAN XL communication systems and drives a logic level at the transmission node as a function of logic levels of the respective second transmission signals;
and
in a first switching mode of operation:
the switching circuitry provides the respective NRZ encoded transmission signals to the bus as the respective second transmission signals;
and
the bus provides respective second reception signals to the plurality of CAN XL communication systems via the switching circuitry, the respective second reception signals having a logic level based on a logic level of the reception node of the bus.

18 more elements

A method, comprising:

for each of a plurality of controller area network data link layer protocol (CAN XL) communication systems of a first processing device:
generating a non-return-to-zero (NRZ) encoded transmission signal, wherein the NRZ encoded transmission signal has a bit rate of a plurality of bit rates;
receiving a NRZ encoded reception signal;
when the NRZ encoded transmission signal has a determined bit rate of the plurality of bit rates, generating a pulse-width modulated (PWM) signal having a duty cycle based on a value of the NRZ encoded transmission signal;
and
generating a transmission signal by:
selecting the NRZ encoded transmission signal as the transmission signal when the NRZ encoded transmission signal has a bit rate different from the determined bit rate;
and
selecting the PWM signal as the transmission signal when the NRZ encoded transmission signal has the determined bit rate;
receiving, by a bus system of the first processing device which is coupled to the plurality of CAN XL communication systems, respective second transmission signals from the plurality of CAN XL communication systems;
driving a logic level at a transmission node of the bus system as a function of logic levels of the second transmission signals;
and
in a first switching mode of operation of a plurality of switching modes of operation:
providing the NRZ encoded transmission signals of the plurality of CAN XL communication systems as the respective second transmission signals to the bus system;
and
providing, to the plurality of CAN XL communication systems, respective second reception signals via the bus system.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/320,764Filed 19 May 2023 · continuation
Priority: IT 10202000003043410 Dec 2020
Published: US 2023/0299999 A121 Sep 2023
Granted: 23 Jul 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04L 12/40013
Architecture of a communication node: details regarding a bus controller
G06F 13/4022
Coupling between buses: using switching circuits, e.g. switching matrix, connection or expansion network
G06F 13/426
On a daisy chain bus: using an embedded synchronisation, e.g. Firewire bus, Fibre Channel bus, SSA bus
H04L 12/40006
Bus networks: architecture of a communication node

Family

Application17/539,936Parent of this continuation · filed 1 Dec 2021
US 2023/0299999 A1Pre-grant publication · published 21 Sep 2023
US 11,695,589 B2Parent of this continuation
US 2022/0191059 A1Published application
US 12,047,198 B2This patent

From the US filing history. Foreign family members aren’t listed.