4.10.1 Vme Controller; Xmc Expansion; Power Supplies; Power Sequencing - SMART Embedded Computing MVME7100ET Installation And Use Manual

4.10.1 VME Controller

The VMEbus interface for the MVME7100ET is provided by the Tsi148 VMEbus controller.
The Tsi148 provides the required VME, VME extensions, and 2eSST functions. TI
SN74VMEH22501 transceivers are used to buffer the VME signals between the Tsi148 and
the VME backplane. Refer to the Tsi148 user's manual for additional details and/or
programming information.
4.11

XMC Expansion

The MVME7100ET provides an additional XMC/PMC module capability through the use of
a 78-pin stacking connector. This connector is connected to the second PCI Express port
on the processor. Up to four additional XMC/PMC modules may be added by using two
expansion boards. Refer to the XMCspan data sheet for additional details and/or
programming information.
4.12

Power Supplies

The MVME7100ET on-board voltages will be generated using Linear Tech LTC3828 dual
output two phase controllers and LTC3416 single output controllers. The following sections
detail the MVME7100ET power requirements.
4.12.1

Power Sequencing

In order to meet the power sequencing requirements of the various components on the
MVME7100ET, 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 +3.3V supply output will be 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
+5.0V 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.
MVME7100ET Single Board Computer Installation and Use (6806800K87G)
Functional Description
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