LE910Cx mPCIe Hardware Design Guide
1VV0301510 Rev. 13 Page 33 of 73 2021-07-07
PIN DESCRIPTION
Active low functional reset to the card
Table 15: PERST_N Signal’
OPERATING LEVELS
The PERST_N line is 3.3V tolerant as specified by PCI Express Mini Card
Electromechanical Specification Revision 2.1 standard.
: The hardware unconditional Reset must not be used during
normal operation of the device since it does not detach the device
from the network. It shall be kept as an emergency exit procedure.
A typical circuit for implementing an unconditional reset is shown below:
: Recommended values R2 = 47kΩ, R1 = 10kΩ.
: In order to avoid a back powering effect it is recommended to
prevent any HIGH logic level signal from being applied to the digital
pins of the LE910Cx-
mPCIE when the module is powered off or
during a reboot transition.
Using bidirectional level translators which do not support High Z
mode during power off is not recommended.
: For Unconditional Restart W_DISABLE_N pin must not be
asserted low otherwise the module will shutdown itself and will not
re
start (this can be used as emergency shutdown but not
recommended)
For proper shutdown refer to Section Power OFF procedure.
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