System Core, Boot Configuration and On-Board Memory 5
miriac SBC-LS1043A2 User Manual
V 2.2
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© MicroSys Electronics GmbH 2017
Pin
Number
on ST4
Signal Name
Signal
Direction
Function
T136
RST-IN#
Input to the
module
Active low module reset:
while active the module is held in reset state
T135
RST-OUT#
Output from
the module
Active low peripheral reset:
while active peripheral devices shall be held in
reset state
B118
WDOG-TRIG#
Output from
the module
Watchdog service signal from the module
which has to be triggered periodically. When
the watchdog is active and the service stops
the module will be reset.
B111
MCU-HRST#
Bi-directional
Please contact MicroSys
B110
COP-PRST#
Input to the
module
Please contact MicroSys
B106
COP-TRST#
Input to the
module
Please contact MicroSys
Table 5-1 Reset signal overview
The default state for RST-IN# is active. Consequently the module is always in a reset
state when the RST-IN# signal is not actively driven high by the carrierboard.
The RST-IN# is an input to the module. It signals that the voltage supplies on the
carrierboard are within their limits and no manual reset is triggered. When active
(signal is low) the microcontroller unit on the module initiates the reset sequence in
order to keep the CPU in a defined reset state. No further interaction from the carri-
erboard is necessary. In case the module reset is active, the module triggers the
RST-OUT# signal which is intended to control the reset of peripheral devices on
the carrierboard i.e. Ethernet PHYs, PCIe slots and devices.
The RST-IN# signal can be triggered by either a powerfault situation, a manual re-
set button press (SW3) or a missing watchdog trigger signal WDOG-TRIG# from
the CPU in case the watchdog has been manually enabled beforehand via SW2.
MCU-HRST#, COP-PRST# and COP-TRST# are for JTAG and debugging pur-
poses only.
The watchdog is off by default.
The watchdog is implemented on the carrier board.
The following voltages on the carrier board are monitored by a Maxim
MAX6751KA29 chip:
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