Reset & Bootmode
----------------

+-----+------------+-----------------------------------------------------------------------------------------------------------+-------+-----+
| Pin | Signal     | Description                                                                                               | type  | I/O |
+=====+============+===========================================================================================================+=======+=====+
|     |            | System Boot Mode Select - The operational system boot mode of the                                         |       |     |
|     |            | module upon system reset is determined by the settings of this pin.                                       |       |     |
|     |            | BOOTMODE=H: Boot from NAND / L: Boot from UART/USB                                                        |       |     |
|     |            | Leave open or connect to VDDIO if not used.                                                               |       |     |
| 8   | BOOTMODE   +---------------------+--------------+---------------------------+------------------------------------------+ VDDIO | I   |
|     |            | **Module**                         | **Remark**                                                           | PU    |     |
|     |            +---------------------+--------------+---------------------------+------------------------------------------+       |     |
|     |            | TX28                               | Depending on BOOTMODE external pull-up/-down resistors are selected  |       |     |
|     |            |                                    | on LCD interface signals LD0..LD5 and LCD_RS (pin 146). Refer to the |       |     |
|     |            |                                    | TX28 datasheet for resistor values and level needed at startup!      |       |     |
+-----+------------+------------------------------------+----------------------------------------------------------------------+-------+-----+
|     |            | Reset Out – Reset carrier board peripherals                                                               |       |     |
| 15  | #RESET_OUT | #RESET_OUT may be used to reset peripherals on the carrier board. Depending on                            | VDDIO | O   |
|     |            | the module type this signal might be asserted automatically by a system reset,                            |       |     |
|     |            | but can be controller by a GPIO function during runtime on all modules.                                   |       |     |
+-----+------------+-----------------------------------------------------------------------------------------------------------+-------+-----+
|     |            | Power On Reset - active low input signal.                                                                 |       |     |
|     |            | Typically a push button reset, pull low to force a reset.                                                 |       |     |
|     |            | A supervisor circuit is used on the TX module to                                                          |       |     |
|     |            | monitor the power supply. This device assert a processor system reset                                     |       |     |
|     |            | (POR_B) if the power supply falls outside the programmed threshold or                                     |       |     |
|     |            | a manual reset (#POR) is asserted externally.                                                             |       |     |
|     |            | Leave open if not used.                                                                                   |       |     |
+ 16  + #POR       +------------------------------------+----------------------------------------------------------------------+ 5V    + I   +
|     |            | **Module**                         | **Remark**                                                           | PU    |     |
+     +            +------------------------------------+----------------------------------------------------------------------+       +     +
|     |            | TX28                               | The i.MX28 power-on reset is generated internally.                   |       |     |
|     |            |                                    | If low the module power supply is disconnected.                      |       |     |
+     +            +------------------------------------+----------------------------------------------------------------------+       +     +
|     |            | TX28S                              | Not connected                                                        |       |     |
+-----+------------+------------------------------------+----------------------------------------------------------------------+-------+-----+
|     |            | Master Reset - external active low Schmitt trigger input signal. When                                     |       |     |
|     |            | this signal goes active, all modules (except the reset module, SDRAMC                                     |       |     |
| 17  | #RESET_IN  | module, and the clock control module) are reset. The behaviour might                                      | VDDIO | I   |
|     |            | depend on the processor, please refer to the processor reference manual                                   |       |     |
|     |            | for details. #RESET_IN is directly connected to the processors RESET_B pin.                               |       |     |
|     |            | Pull or connect to VDDIO if not used.                                                                     |       |     |
+-----+------------+-----------------------------------------------------------------------------------------------------------+-------+-----+

.. figure:: ../images/reset_bootmode.png
   :align: center