K3用户手册 (User Manual)Connectivity14. Connectivity Subsystem This section describes the connectivity subsystem modules listed below. 14.1 PCIe 3.0 (IOMMU) 14.2 USB 14.3 Ethernet GMAC 14.4 CAN-FD Interface 14.5 SPI Interface 14.6 UART Interface 14.7 I2C Bus Interface 14.8 IR-RX Interface 14.9 eSPI