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5.1
PCI Express™
The conga-QMX6 offers one PCI Express lane. The PCIe signals are routed from the Freescale
®
i.MX6 processor to the PCI Express port 0
of the conga-QMX6 edge finger. These signals support PCI Express Gen. 2.0 interfaces at 5 Gb/s and are backward compatible to Gen. 1.1
interfaces at 2.5 Gb/s. Only x1 PCI Express link configuration is possible.
For more information about the PCI Express interface on the edge finger, refer to the conga-QMX6 pinout table in section 9 “Interface - Signal
Descriptions and Pinout Tables.”
5.2
UART/RS-232
The conga-QMX6 offers one UART interface on the MXM connector and two RS-232 interfaces onboard. The UART offered on the MXM
connector is fully featured with control signals (4 pin UART) and is connected directly to UART3 port of the Freescale
®
i.MX6 Cortex A9
processor.
The conga-QMX6 offers the two onboard RS-232 interfaces via a 6-pin Molex connector. This connector is provided by routing the UART2
and UART5 pins of the Freescale
®
i.MX6 processor to the MAXIM-3232 transceiver. The transceiver converts the Qseven
®
UART CMOS level
(3.3V) to RS-232 voltage levels (5v) and is guaranteed to run at data rates of 250 kbps in the normal operating mode, while maintaining RS-232
output levels. With the Molex connector, you can output data to the console by using the appropriate RS-232 adapter cable.
The UART interfaces support speeds up to 4.0 Mbps and Non-Return-To-Zero encording format, RS-485 compatible 9 bit data format and IrDA
compatible infrared slow data rate format.
Note
You can realize a second UART interface on the MFG interface. This implementation however requires a customized conga-QMX6 variant.
Contact congatec support for more information.
To display the u-boot output to console, you need the RS232 adapter cable (PN: 48000023). See section 10.1 “UART/RS-232 Debug Port” for
more information about the RS232 adapter cable and the UART pin description.
Caution
The MFG_NC4 pin is high active on the conga-QMX6 module. This means that the MFG interface on the edge connector functions as JTAG
interface by default. Therefore, do not use the MFG interface for UART purposes or externally pull the MFG_NC4 pin to ground. Failure to
adhere to this warning may result to back-driving which can damage the module.
If you need the UART function on the MFG interface, then you require a customized conga-QMX6. For more information, contact congatec support.