μ
Q7-A75-J
μ
Q7-A75-J User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.B. - Reviewed by P.Z. - Copyright © 2016 SECO S.r.l.
25
3.2.1.3
FastEthernet signals
FastEthernet interface is realized, on
μ
Q7-A75-J module, using a Micrel
®
KSZ8091 Gigabit Ethernet transceiver, which is interfaced to NXP i.MX6 processor
through RMII interface.
Here following the signals involved in Fast Ethernet management
G/GBE_MDI0-: Media Dependent Interface (MDI) Transmit differential pair
G/GBE_MDI1-: Media Dependent Interface (MDI) Receive differential pair
GBE_ACT#: Ethernet controller activity indicator. Active Low Output signal, electrical level +3P3V_S with a 4k7
Ω
pull-up resistor
GBE_LINK100#: Ethernet controller 100Mbps link indicator. Active Low Output signal, electrical level +3P3V_S with a 10k
Ω
pull-up resistor.
3.2.1.4
USB interface signals
NXP i.MX6 processor offers four different USB 2.0 controllers.
USB 2.0 controller Core #0 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
USB 2.0 controller Core #1 can work only in Host mode, and can work in HS, FS and LS.
i.MX6 processor
’
s USB controller cores #2 and #3 are not used by the module.
Here following the signals related to USB interfaces.
/USB_P0-: Universal Serial Bus Port #0 differential pair (directly managed by i.MX6 USB Host Controller core #1).
/USB_P1-: Universal Serial Bus Port #1 differential pair (directly managed by i.MX6 USB OTG port).
USB_ID: USB ID Input, electrical level +3P3V_S, 10k
Ω
pull-up. This signal must be driven as an open collector signal by external circuitry placed on the carrier
board. It must be tied to GND when USB Port #1 has to be set to work in Host mode. When not driven, USB Port#1 will work in Client mode.
USB_VBUS: USB Client Connect Pin, electrical level +3P3V_S, 10k
Ω
pull-up. When USB Port #1 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).
For EMI/ESD protection, common mode chokes on USB data lines, and clamping diodes on USB data and voltage lines, are also needed.
