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FPC Connector

The Radxa ROCK 4D features an onboard FPC (Flexible Printed Circuit) connector that supports PCIe 2.1 standard with a single lane (x1) for high-speed data expansion.

You can connect a PCIe to M.2 M Key HAT to the FPC interface and use it with an M.2 NVMe SSD to boot the system or expand storage capacity.

User Guide

To use an M.2 NVMe SSD, you need to connect it to the ROCK 4D's FPC interface using a PCIe to M.2 M Key HAT.

  • Expanding Storage

Insert the M.2 NVMe SSD into the PCIe to M.2 M Key HAT, then connect the HAT to the ROCK 4D's FPC interface. Use the lsblk command to verify if the NVMe SSD is recognized.

  • As a System Boot Drive

Refer to the Install System to NVMe SSD tutorial. After installation, insert the NVMe SSD into the PCIe to M.2 M Key HAT, then connect the HAT to the ROCK 4D's FPC interface to test if the system boots normally.

Interface Specifications

tip

For detailed interface specifications, please refer to the Hardware Design: Schematics in the download section.

Pin#NamePin#NamePin#Name
1VCC5V0_SYS_S57PCIE0_SOC_RXP13PCIE0_PWREN_H
2VCC5V0_SYS_S58PCIE0_SOC_RXN14PCIE0_WAKEN_M0
3GND9GND15PCIE0_CLKREQn_M0
4PCIE0_SOC_REFCLKP10PCIE0_SOC_TXP16PCIE0_PERSTn
5PCIE0_SOC_REFCLKN11PCIE0_SOC_TXN
6GND12GND