2: Functional Description
xPico® Embedded Device Server Integration Guide
27
Reset Pins
The xPico and xPico Wi-Fi embedded device servers have two signals for use as reset
signals. Signal EXT_RESET# is a hardware controlled input signal that will reboot the
xPico processor when asserted low. Signal DEFAULT# is polled by the xPico software.
When DEFAULT# is asserted low for six seconds, the unit will reset the system to the
default manufacturing settings and reboot the unit. xPico Wi-Fi embedded device server
has an additional signal on pin 14 that can be used to wake up the unit processor when
the unit is in a sleep or power down state.
Table 2-15 xPico Reset Signals
Signal
Pin
Description
Reset
State
Internal pull-up
EXT_RESET#
38
Unit hardware reset, active low. Assert
low for a minimum of 50 milliseconds,
then release to reboot unit. Signal may
be left floating.
Input
10K (xPico unit)
40K (xPico Wi-Fi
unit)
DEFAULT#
36
Unit reset to default, active low.
For wired xPico units
Drive low and reboot the device to
reset unit to factory defaults.
For xPico Wi-Fi units
While device is running, drive low for
greater than 6 seconds, then release
to reset unit to factory defaults. While
device is held in reset, drive low,
release reset to boot device with Line 1
CLI default settings (original
configuration is preserved), then
release after CLI session is
established.
Input
Active 56K to
122K (xPico unit)
40K (xPico Wi-Fi
unit)
WAKE (xPico
Wi-Fi unit only)
14
Toggle signal from low to high can wake
device from Sleep or Standby mode.
Hold low to allow device to enter Sleep
or Standby mode. Subject to
configuration settings.
Input 40K
