Boot Strap Signals - Seco Qseven Q7-974 User Manual

Rel. 2.0 comliant module with the intel bay trail family system-on-chips

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3.2.3.16

Manufacturing signals

According to Qseven

Standard specifications, rel. 2.0, on pin designed as MFG_NCx (pins 204, 207÷210) are carried the JTAG signal necessary to program Q7-

974 embedded microcontroller.

The JTAG interface available on MFG_NCx pins is reserved only for the manufacturing phase; it must not be used by the customer.

It is not possible at all to use these pins to trace the software (for debug purposes)

3.2.4

BOOT Strap Signals

Configuration straps are signals that, during system reset, are set as inputs (independently by their behaviour during normal operations) in order to allow the proper

configuration of the processor / chipset. For this reason, on Q7-974 are placed the pull-up or pull-down resistors that are necessary to configure the board

properly.

The customer must avoid to place, on the carrier board, pull-up or pull-down resistors on signals that are used as strap signal, since it could result in malfunctions

of Q7-974 module.

The following signals are used as configuration straps by Intel

HDMI_CTRL_DAT: pin 150 of golden finger connector. Normally used as DDC Data line for HDMI panel. Signal at +3.3V_S voltage level with a 2k2Ω pull-up

resistor. It is used as a strap signal of Q7-974 module to configure properly the digital display interface used for HDMI / DVI / DP.

Q7-974

Atom E38xx SOCs at system reset.

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