Technical data

Preparing the Board
http://www.mcg.mot.com/literature 1-9
1
SRAM Backup Power Source Select Header (J14)
Header J14 determines the source for onboard static RAM backup power
on the MVME172LX.
The following backup power configurations are available for onboard
SRAM through header J14. In the factory configuration, the VMEbus +5V
standby voltage serves as primary and secondary power source (the
onboard battery is disconnected).
Note For MVME172LXs without the optional VMEbus interface
(i.e., without the VMEchip2 ASIC), you must select the
onboard battery as the backup power source.
!
Caution
Removing all jumpers may temporarily disable the SRAM.
Do not remove all jumpers from J14, except for storage.
J14
(Factory configuration)
2
1
J14
Backup Power Disabled
Primary Source Onboard Battery
6
5
2
1
6
5
J14
2
1
6
5
J14
2
1
6
5
J14
2
1
6
5
Secondary Source Onboard Battery
Primary Source VMEbus +5V STBY
Secondary Source VMEbus +5V STBY
Primary Source VMEbus +5V STBY
Secondary Source Onboard Battery
Primary Source Onboard Battery
Secondary Source VMEbus +5V STBY
(For storage only)