Differences In E/E Architecture Between Star2 And Star3 - SN00.00-P-0070-22S

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The STAR2 topology was limited to the following bus systems:

LIN bus
CAN 2.0
FlexRay
MOST bus
HSVL (High-speed video link)

The STAR3 topology marks a response to the stricter requirements and implements them with additional bus systems. The following is a list of the STAR3 bus systems:

LIN bus
CAN 2.0
FlexRay
MOST bus
CAN FD
Automotive Ethernet
HSVL 2.0

The main difference between STAR2 and STAR3 lies in the new CAN FD bus, the Automotive Ethernet network and HSVL 2.0, with which much higher data volumes can be sent securely.

It is not only the pure speed of the data transfer that plays a role in this but also the sizes of the data packets that contain the maximum of eight times the useful data volume in the case of CAN FD.

CAN FD operates at a flexible data transfer rate of up to 2 Mbit/s, whereas conventional CAN bus systems work at a maximum of 1 Mbit/s and have a fixed data transfer rate of 250 kbit/s, 500 kbit/s or 1 Mbit/s, for example.

Automotive Ethernet is used for data transfer with particularly high bandwidth.

Automotive Ethernet operates at data transfer rates of 100 Mbit/s (in the case of 100BASE-T1). In order to provide sufficient interference resistance, the Ethernet lines consist of jacketed and twisted strands.

Each connected control unit is identified using its unique MAC address and can simultaneously send and receive data.

Due to increasing display sizes and resolutions, bandwidth requirements in video transmission are becoming more demanding all the time. With the STAR3 E/E architecture, HSVL 2.0 is therefore being introduced into networking.