Motorola MVME162 - SRAM Battery Backup Source Select Header (J20)

Hardware Preparation
MVME162/D2 2-7
2
SRAM Battery Backup Source Select Header (J20)
The MVME162 is factory-configured to use VMEbus +5V standby power as a
backup power source for the SRAM (i.e., jumpers are installed across pins 1
and 3 and 2 and 4). To select the onboard battery as the backup power source,
install the jumpers across pins 3 and 5 and 4 and 6.
Note
For MVME162s 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 J20, except for storage.
EPROM Size Select Header (J21)
The MVME162 is factory-configured for a 4Mbit EPROM (i.e., a jumper is
installed across pins 2 and 3). This is the only size currently available; if a
larger EPROM becomes available, this jumper will allow it to be selected.
(Factory configuration)
VMEbus +5V STBY
J20
2
1
6
5
J20
2
1
6
5
J20
2
1
Backup Power Disabled
Onboard Battery
6
5
(For storage only)
1
2
3
(Factory configuration)
J21
4Mbit EPROM