Power Supply Filtering And Fusing; Clock Distribution; System Clock; Real Time Clock Input - SMART Embedded Computing MVME7100ET Installation And Use Manual

Functional Description
4.12.3

Power Supply Filtering and Fusing

Each of the switching power supply inputs on the MVME7100ET will have an inductor to
reduce switching noise from being fed back onto the +5.0V input. The LTC3828 supplies
will each have a 10A 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 MVME7100ET Single Board Computer
Programmer's Reference manual.
4.13.1

System Clock

The system clock is driven by an oscillator. The following table defines the clock
frequencies for various configurations.
Table 4-1
SYSCLK
66.67MHz
66.67MHz
4.13.2

Real Time Clock Input

The RTC clock input is driven by a 1MHz clock generated by the Control and Timers PLD.
This provides a fixed clock reference for the MC864xD PIC timers which software can use
as a known timing reference.
4.13.3

Local Bus Controller Clock Divisor

The Local Bus Controller (LBC) clock output is connected to the PLD but is not used by the
internal logic
76
Clock Frequencies
Core
1.3GHz
1.067GHz
MVME7100ET Single Board Computer Installation and Use (6806800K87G)
MPX (Platform)
533MHz
533MHz
Functional Description
DDR2
266MHz
266MHz