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Manufacturing/JTAG Interface
Table 23 Manufacturing Signal Descriptions
Signal
Pin #
Description
I/O
PU/PD Comment
MFG_NC0
207
This pin is reserved for manufacturing and debugging purposes. May be used as JTAG_TCK signal for
boundary scan purposes during production or as a vendor specific control signal. When used as a vendor
specific control signal the multiplexer must be controlled by the MFG_NC4 signal.
NA
NA
MFG_NC1
209
This pin is reserved for manufacturing and debugging purposes. May be used as JTAG_TDO signal for
boundary scan purposes during production. May also be used, via a multiplexer, as a UART_TX signal to
connect a simple UART for firmware and boot loader implementations. In this case the multiplexer must be
controlled by the MFG_NC4 signal.
NA
NA
See caution statement
below.
MFG_NC2
208
This pin is reserved for manufacturing and debugging purposes. May be used as JTAG_TDI signal for
boundary scan purposes during production. May also be used, via a multiplexer, as a UART_RX signal to
connect a simple UART for firmware and boot loader implementations. In this case the multiplexer must be
controlled by the MFG_NC4 signal.
NA
NA
See caution statement
below
MFG_NC3
210
This pin is reserved for manufacturing and debugging purposes. May be used as JTAG_TMS signal for
boundary scan purposes during production. May also be used, via a multiplexer, as vendor specific BOOT
signal for firmware and boot loader implementations. In this case the multiplexer must be controlled by the
MFG_NC4 signal.
NA
NA
MFG_NC4
204
This pin is reserved for manufacturing and debugging purposes. May be used as JTAG_TRST# signal for
boundary scan purposes during production. May also be used as control signal for a multiplexer circuit on
the module enabling secondary function for MFG_NC0..3 ( JTAG / UART ). When MFG_NC4 is high active it
is being used for JTAG purposes. When MFG_NC4 is low active it is being used for UART purposes.
NA
NA
Note
The MFG_NC0..4 pins are reserved for manufacturing and debugging purposes. It’s recommended to route the signals to a connector on
the carrier board. The carrier board must not drive the MFG_NC-pins or have pull-up or pull-down resistors implemented for these signals.
MFG_NC0...4 are defined to have a voltage level of 3.3V. It must be ensured that the carrier board has the correct voltage levels for JTAG/
UART signals originating from the module. For this reason, a level shifting device may be required on the carrier board to guarantee that these
voltage levels are correct in order to prevent damage to the module.
More information about implementing a carrier board multiplexer can be found in the Qseven
®
Design Guide.
Caution
The MFG_NC4 pin is high active on the conga-QMX6 module. This means that the MFG interface on the edge connector functions by default
as JTAG interface. 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
