D
ELTA
T
AU
P
OWER
PMAC
R
EFERENCE
JUNE-2018
P
OWER
PMAC
UMAC
ARM
CPU
B
OARD
H
ARDWARE
R
EFERENCE
18
Watchdog Timer Connection (TB2)
The Power PMAC UMAC ARM CPU board provides a dedicated connector for the output of the
on-board watchdog timer. This 3-point removable terminal block is on the bottom edge of the
board, midway. The solid-state relay output on this connector can be used for fail-safe shutdown
of power circuitry in case of timer trip or loss of controller power.
Optional PCI Express Connection
The Power PMAC UMAC ARM CPU board optionally provides one PCI Express connector on
the “back side” of the board (the left side when looking at the rack from the front). This permits
the installation of PCI Express expansion cards inside the rack provided there is space available
in the rack to the left of the CPU board, such as video cards, vision systems, and additional
Ethernet ports in the Power PMAC system.
PCIe (x4) Connector (P4)
The P18 connector near the top of the back side of the CPU board provides a “times 4” (x4 – four
serial channels) PCI Express connection. It is considered Port 1/Slot 1 by the CPU. PCI Express
“x1” and “x4” accessories can be installed in this connector. This connector is in the right-angle
configuration. The PCIe accessory board will be parallel to the CPU board, and the assembly will
occupy 2 or 3 slots in the UMAC rack.
LED Indicators
D10: This is a dual colored LED. When this LED is green, it indicates that power is applied to the
+5V input when this LED is red, it indicates that the watchdog timer has tripped.
D15: This is an amber colored LED. When this LED is lit it indicates that the backplane reset has
completed and Power PMAC is ready for communication.
D33: This is a dual colored LED. When this LED is green, it indicates that the “P1” port on the
604147 daughter card is in RS-232 mode. When this LED is yellow it indicates that the “P1” port
on the 604147 daughter card is in USB-Flash mode. This is toggled by the micro push button
switch “S2”.
