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FRAME#: PCI Cycle Frame indicator, +3.3V_S active low bidirectional signals with 10kΩ pull-up resistor. This signal is used by the Bus Master to indicate the
beginning of a transaction, and remains low (asserted) until the transaction is finished or in the final phase.
PCIRST#: PCI Reset, +3.3V_S active low output with 10kΩ pull-up resistor. It is driven low during system reset to reset the whole PCI bus
INTA#, INTB#, INTC#, INTD#: PCI interrupt lines, +3.3V_S active low inputs with 10kΩ pull-up resistor.
3.2.5.2
USB interface signals (connector X1 - CN6)
®
Intel
Bay Trail family of SOCs embeds one EHCI controller, which is able to manage up to four USB 1.x / 2.0 Host ports.
On ETX-A61 module, these four USB 2.0 ports are carried out directly on connector X1 (CN6). All of them are able to work in High Speed (HS), Full Speed (FS)
and Low Speed (LS).
Via BIOS it is possible to enable or disable singularly each USB port.
Here following the signals related to USB interfaces.
USB0+/USB0-: Universal Serial Bus Port #0 bidirectional differential pair.
USB1+/USB1-: Universal Serial Bus Port #1 bidirectional differential pair.
USB2+/USB2-: Universal Serial Bus Port #2 bidirectional differential pair.
USB3+/USB3-: Universal Serial Bus Port #3 bidirectional differential pair.
OVCR#: USB Over Current Detect Input. Active Low Input signal, electrical level +3.3V_A with 10kΩ pull-up resistor. This pin (available on connector X4 - CN7)
has to be used for overcurrent detection of USB Ports of ETX-A61 module
Please notice that for correct management of Overcurrent signals, power distribution switches are needed on the carrier board.
For EMI/ESD protection, common mode chokes on USB data lines, and clamping diodes on USB data and voltage lines, are also needed.
The schematics in the following page show an example of implementation on the Carrier Board. In there, all USB ports #0, #1, #2 and #3 are carried out to
standard USB 2.0 Type A receptacles.
All schematics (henceforth also referred to as material) contained in this manual are provided by SECO S.r.l. for the sole purpose of supporting the
customers' internal development activities.
The schematics are provided "AS IS". SECO makes no representation regarding the suitability of this material for any purpose or activity and disclaims all
warranties and conditions with regard to said material, including but not limited to, all expressed or implied warranties and conditions of merchantability,
suitability for a specific purpose, title and non-infringement of any third party intellectual property rights.
The customer acknowledges and agrees to the conditions set forth that these schematics are provided only as an example and that he will conduct an
independent analysis and exercise judgment in the use of any and all material. SECO declines all and any liability for use of this or any other material in
the customers' product design
ETX-A61
ETX-A61 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.2 - Author: S.B. - Reviewed by G.G. Copyright © 2017 SECO S.r.l.
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