Electrical aspects common for both solutions
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Note:
For more details see
netX90 Technical Data Reference Guide (Doc-ID
DOC160609TRG03EN), p.24 „Reset"
netX90 Design-In Guide (Doc-ID DOC180501DG04EN), p.12
"Power-on reset and reset in"
4.2.2.2
Reset Out
The Reset Out signal
RST_OUT_N
can be used to reset external connected
peripherals if necessary.
This is an output signal to reset connected peripheral devices. It is a tri-
state signal that can be enabled and set to high or low level by a software
command. Any reset will disable the output driver of the signal allowing you
to set the desired reset default level to low or high by using an external pull-
down or pull-up resistor.
Figure 8: Reset Logic OUT
Recommendation:
Keep the signal way of
RST_OUT_N
short.
4.2.3
Boot signal and boot options
Boot modes
The NRP H90-RE can be operated in the following three different boot
modes:
1. standard boot mode
2. alternative boot mode
3. console mode
Which one of these boot modes is selected after a hardware reset,
depends on the status of the RDY# and RUN# signals (pins 38 and 39,
both low-active).
Standard boot mode
Standard boot mode is intended to execute standard firmware.
The order of execution of these modes is defined as follows:
First of all, the ROM code tries to start a firmware in standard boot mode if
available.
If this does not succeed, the ROM code tries to start a maintenance
firmware in alternative boot mode.
netRAPID 90 | Design guide
DOC190601DG01EN | Revision 1 (Draft 10) | English | 2019-09 | Preliminary | Public
© Hilscher 2019
