Seco SM-C12 User Manual page 31

3.2.1.12 PCI Express interface signals
The SM-C12 module can offer two PCI Express x1 lanes, which is directly managed by i.MX8 processor (all versions).
PCI express Gen 2.0 (5Gbps) is supported.
Here following the signals involved in PCI express management
PCIE_A_RX+/ PCIE_A_RX-: PCI Express lane #0, Transmitting Output Differential pair
PCIE_A_TX+/PCIE_A_TX-: PCI Express lane #0, Receiving Input Differential pair
PCIE_A_REFCK+/ PCIE_A_REFCK-: PCI Express Reference Clock for lane #0, Differential Pair
PCIE_A_RST#: Reset Signal that is sent from SMARC Module to a PCI-e device available on the carrier board. Active Low, +3.3V_S electrical level. Controlled by a
STM32 MCU soldered onboard the SMARC module.
PCIE_B_RX+/ PCIE_B_RX-: PCI Express lane #1, Transmitting Output Differential pair
PCIE_B_TX+/PCIE_B_TX-: PCI Express lane #1, Receiving Input Differential pair
PCIE_B_REFCK+/ PCIE_B_REFCK-: PCI Express Reference Clock for lane #1, Differential Pair
PCIE_B_RST#: Reset Signal that is sent from SMARC Module to a PCI-e device available on the carrier board. Active Low, +3.3V_S electrical level. Controlled by a
STM32 MCU soldered onboard the SMARC module.
3.2.1.13 Gigabit Ethernet signals
Gigabit Ethernet interface is realized on SM-C12 module by using a Texas Instruments DP83867CRRGZR Gigabit Ethernet transceiver, which is interfaced to NXP
i.MX 8M processor through an RGMII interface.
Here following the signals involved in Fast Ethernet management
GBE0_MDI0+/GBE0_MDI0-: Media Dependent Interface (MDI) Transmit/Receive differential pair
GBE0_MDI1+/GBE0_MDI1-: Media Dependent Interface (MDI) Transmit differential pair
GBE0_MDI2+/GBE0_MDI2-: Media Dependent Interface (MDI) Transmit differential pair
GBE0_MDI3+/GBE0_MDI3-: Media Dependent Interface (MDI) Transmit differential pair
GBE0_LINK_ACT#: Ethernet controller activity indicator. Active Low Output signal, +3.3V_S electrical level
GBE0_LINK100#: Ethernet controller 100Mbps link indicator. Active Low Output signal, +3.3V_S electrical level
GBE0_LINK1000#: Ethernet controller 1Gbps link indicator. Active Low Output signal, +3.3V_S electrical level
3.2.1.14 Watchdog
WDT_TIME_OU: Watchdog timer Output. +1.8V_S electrical level
SM-C12
SM-C12 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Authors: S.B. and L.G - Reviewed by N.P. - Copyright © 2019 SECO S.p.A.
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