Seco SM-C12 User Manual page 30

3.2.1.11 USB interface signals
The module has 5x USB ports consisting of 1x USB 2.0 OTG port from the NXP i.MX 8M processor USB 2.0 controller. 2x USB 3.0 Superspeed and 2x USB 2.0
from a Cypress USB3304-68LTXC USB 3.0 hub controller.
USB 2.0 controller Core #1 is capable of OTG (On-The-Go) capabilities, capable to work in High Speed (HS), Full Speed (FS) and Low Speed (LS) in Host mode,
and HS/FS in peripheral mode. It is carried out directly to the golden finger connector
To allow OTG functionality, the following signal must be driven as an open collector signal by external circuitry placed on the carrier board:
USB0_OTG_ID: USB OTG Input, electrical level +3.3V_S. When USB Port #0 is set to work in Client mode, then this signal shall be used to inform the USB controller
when an external USB Host is connected (signal High) or disconnected (Signal Low). It must be tied to GND when USB Port #0 has to be set to work in Host mode.
When not driven, USB Port#0 will work in Client mode.
Here following the signals related to USB interfaces.
USB0+/ USB0-: Universal Serial Bus Port #0 differential pair (directly managed by i.MX 8M USB Host Controller core #1).
USB0_EN_OC#: Power Enable and over current monitoring function. Active Low Output signal, +3.3V_S electrical level with a 10kΩ pull-up resistor. Refer to SMARC
2.0 Specification for over current operation information.
USB1+/ USB1-: Universal Serial Bus Port #1 differential pair
USB1_EN_OC#: Power Enable and over current monitoring function. Active Low Output signal, +3.3V_S electrical level with a 10kΩ pull-up resistor. Refer to SMARC
2.0 Specification for OC operation information.
USB2+/USB2-: Universal Serial Bus Port #2 differential pair.
USB2_SSTX+/ USB2_SSTX-: USB Port #2 Superspeed Transmit differential pair.
USB2_SSRX+/ USB2_SSRX-: USB Port #2 Superspeed Receive differential pair.
USB2_EN_OC#: Power Enable and over current monitoring function. Active Low Output signal, +3.3V_S electrical level with a 10kΩ pull-up resistor. Refer to SMARC
2.0 Specification for OC operation information.
USB3+/USB3-: Universal Serial Bus Port #3 differential pair.
USB3_SSTX+/ USB3_SSTX-: USB Port #3 Superspeed Transmit differential pair.
USB3_SSRX+/ USB3_SSRX-: USB Port #3 Superspeed Receive differential pair.
USB3_EN_OC#: Power Enable and over current monitoring function. Active Low Output signal, +3.3V_S electrical level with a 10kΩ pull-up resistor. Refer to SMARC
2.0 Specification for OC operation information.
USB4+/ USB4-: Universal Serial Bus Port #4 differential pair
USB4_EN_OC#: Power Enable and over current monitoring function. Active Low Output signal, +3.3V_S electrical level with a 10kΩ pull-up resistor. Refer to SMARC
2.0 Specification for OC operation information.
For EMI/ESD protection, common mode chokes on USB data lines, and clamping diodes on USB data and voltage lines, are also needed.
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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