Preparing the Board
http://www.motorola.com/computer/literature 1-13
1
IP Bus Strobe (J19)
Some IP bus implementations make use of the Strobe∗ signal (pin AA19
on the Petra ASIC) as an input to the IP modules from the Petra IP2 sector.
Other IP interfaces require that the strobe be disconnected.
With a jumper installed between J19 pins 1-2, a programmable frequency
source is connected to the Strobe∗ signal on the IP bus (for details, refer to
the Petra/IP2 chip programming model in the Programmer’s Reference
Guide).
If the jumper is removed from J19, the strobe line is available for a
sideband type of messaging between IP modules. The Strobe∗ signal is not
connected to any active devices on the board, but it may be connected to a
pull-up resistor.
SRAM Backup Power Source (J22)
Header J22 determines the source for onboard static RAM backup power
on the MVME162P4. In the factory configuration, VMEbus +5V standby
voltage serves as primary and secondary power source (the onboard
battery is disconnected).
The backup power configurations available for onboard SRAM through
header J22 are illustrated in the following diagram.
Note For MVME162P4s without the optional VMEbus interface (i.e.,
without the VMEchip2 ASIC), you must select the onboard
battery as the backup power source.
2
1
J19
IP Strobe disconnected
2
1
(Factory configuration)
J19
IP Strobe connected
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