Chapter 2 – Hardware Information 17Carrier Board UP 4000 M.2 PlusPin Signal Description Pin Signal Description27 GND 28 NC29 NC 30 NC31 NC 32 NC33 GND 34 NC35 NC 36 NC37 NC 38 NC39 GND 40 SMBus Data41 PCIE_RXN 42 SMBus Clock43 PCIE_RXP 44 SMBus ALERT#45 GND 46 NC47 PCIE_TXN 48 NC49 PCIE_TXP 50 Platform reset51 GND 52 NC53 PCIE_REFCLK0_N 54 PCIe Wake55 PCIE_REFCLK0_P 56 NC57 GND 58 NC67 NC 68 Suspend clock69 NC 70 +3.3V71 GND 72 +3.3V73 GND 74 +3.3V75 GND 76 GND77 GND H1 NCH2 NC - -