Artesyn MVME4100ET Single Board Computer Installation and Use (June 2014) - Manual (Page 76)

Functional Description
MVME4100ET Single Board Computer Installation and Use (6806800K76F) 76
4.12.1 Power Sequencing
In order to meet the power sequencing requirements of the various components on the
MVME4100ET, the power supply controllers implement voltage tracking which allows the
power supply outputs to track each other coincidentally during power up and power down. The
+3.3 V supply output is used as the tracking reference. All supply outputs will reach their final
values within 20 milliseconds during power up.
4.12.2 Power Supply Monitor
Logic is provided on-board to monitor the PGOOD signal from the LTC3828 and LTC3416
regulators to determine if the power supply outputs are within tolerance. If any of the power
supplies fail, this logic shuts off the power supplies to avoid any component damage. If the
+5.0 V power supply is still good during a fail condition, a planar red LED (PWR FAIL D9) is
illuminated to indicate the power supply fail condition.
4.12.3 Power Supply Filtering and Fusing
Each of the switching power supply inputs on the MVME4100ET will have an inductor to reduce
switching noise from being fed back onto the +5.0 V input. The LTC3828 supplies will each have
a 10 A fuse to protect the supplies from over-current in case of component failure.
4.13 Clock Distribution
The clock function generates and distributes all of the clocks required for system operation.
The PCI-E clocks are generated using an eight output differential clock driver. The PCI/PCI-X
bus clocks are generated by the bridge chips from the PCI-E clock. Additional clocks required
by individual devices are generated near the devices using individual oscillators. For clock
assignments, refer to the MVME4100ET Single Board Computer Programmer’s Reference manual.