Packet switch ICs support in-car digital communication

November 05, 2019 //By Christoph Hammerschmidt
Packet switch ICs support in-car digital communication
With two PCIe 2.0 packet switch ICs, Diodes, Inc. is targeting automotive data communications applications, for examples in telematics, ADAS, navigation systems V2X and further emerging applications.

Offering 3-ports/4-lanes and 4-ports/4-lanes, respectively, Diodes’s two new packet switches bear the type designations PI7C9X2G304EVQ and PI7C9X2G404EVQ . The parts are designed to provide a simple solution to increase the fan-out of PCIe ports on SoCs, ASSPs, MPUs, and FPGAs, supporting advanced features in the automotive industry. The devices are qualified to AEC-Q100 Grade 2, offer an operating temperature range of -40°C to +105°C, and are manufactured in IATF 16949 certified facilities using PPAP quality control procedures.

Interoperability at the system level is guaranteed through compliance with the PCI-SIG PCIe Rev 2.1 standard. At the component level, pin-compatibility with Grade 3 solutions provides a migration path to higher performance for existing designs. 

Advanced features include an integrated clock buffer and support for peer-to-peer traffic forgreater system performance. The low-power operation is complemented by link power management, including active-state power management L0 and L1, device-state power management D0, D3Hot and D3Cold. Power dissipation in L0 is 300mW (typical), dropping to 35mW in PCI-PM L1.1 D3Hot PM sub-state mode.

Latency for a packet running through the switch without blocking is 150ns, and latency tolerance reporting improves platform power management. While the default mode is cut-through, store and forward modes are also supported. Peer-to-peer traffic is enabled through access control service support. 

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