Sram Battery Backup Source Select Header (J20); Eprom Size Select Header (J21) - Motorola MVME162 User Manual

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.
N For MVME162s without the optional VMEbus interface (i.e.,
ote
without the VMEchip2 ASIC), you must select the onboard
battery as the backup power source.
C Removing all jumpers may temporarily disable the SRAM.
aution
Do not remove all jumpers from J20, except for storage.
J20
1 2
5 6
VMEbus +5V STBY
(Factory configuration)

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.
MVME162/D2
J20
2
1
5 6
Backup Power Disabled
(For storage only)
J21
1
2
3
4Mbit EPROM
(Factory configuration)
Hardware Preparation
J20
1 2
5 6
Onboard Battery
2-7
2