SoC Steers Toward Zonal Automotive Gateways

June 10, 2021

NXP’s S32G2 family is built to meet the needs of automotive gateways in a zonal architecture.

NXP is now delivering its TEF82xx radar transceiver and S32R2 radar processing unit that were announced at the start of the year. At its NXP Technology Days, the company also has been highlighting the S32G2 system-on-chip (SoC), which targets automotive gateways for the zonal approach to implementing control systems in the smart car (Fig. 1).

1. A domain automotive architecture controls and divides by function while a zonal approach puts the structure in software using a more regular network approach. (Courtesy of NXP)

The zonal approach to a vehicle control system moves more of the functionality into software, where it can be located in different portions of the network. This is in contrast to a more conventional domain-oriented approach, where dedicated functions are found in an electronic control unit (ECU) that’s then networked.

The S32G2 is designed to meet ASIL-D requirements as well as provide a range of communication options, from Flexray to automotive Ethernet (Fig. 2). In addition to CAN FD and Flexray support, the SoC includes a programmable network accelerator for three Ethernet ports, including one 2.5-Gb/s interface.

2. The S32G2 supports lockstep operation for the real-time Cortex-M7 as well as the Cortex-A53 cluster. It provides an array of communication options from CAN FD and Flexray to automotive Ethernet.

On top of that, there’s a multiport Ethernet switch, plus on-chip PHYs support 100BASE-T1/TX. The Ethernet MACs can use off-chip PHYs for 1- and 2.5-Gb Ethernet connectivity. The network API allows developers to configure and accelerate network functions such as VPN support without burdening either processor complex.

The SoC is able to handle real-time chores without resorting to an external processor via a lockstep-enabled Cortex-M7 cluster. Even the main Cortex-A53 cluster supports lockstep operation. The application cluster supports hypervisors from Green Hills Software, OpenSynergy, QNX, Wind River, and XEN. Connections to AWS and Cloudera are available for services ranging from over-the-air (OTA) updates to vehicle health. Compilers from Green Hills Software, IAR Systems, and Wind River support the real-time cluster as well.

The S32G2 family starts with the S32G324M SoC, which foregoes the application processor cluster that’s designed for zonal controller applications (Fig. 3). At the top end is a quad-core Cortex-A53-based SoC that targets compute and gateway functionality.

3. The S32G2 pin-compatible family scales from the zonal controller up to a service-oriented gateway.

Developers can get started with the S32G2 Goldbox reference design (Fig. 4). This rugged, air-cooled system supports the range of NXP tools and third-party integration, including support for various cloud and service providers. The Goldbox contains the RDB2 S32G reference design board.

4. The S32G2 Goldbox reference design is available for immediate prototyping.

Another alternative is the miriac MPX-S32G274A module (Fig. 5) from MicroSys (distributed by Eurotech in the U.S.). The module adds 4 GB of LPDDR4 DRAM plus 16 GB of eMMC and 64 MB of QSPI flash memory.

5. MicroSys’s miriac MPX-S32G274A module meets ASIL-D requirements.

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William G. Wong | Senior Content Director - Electronic Design and Microwaves & RF

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