Motorola Single Board Computer 用户手册
RAM500 Memory Expansion Module
D-7
D
8. Turn the entire assembly over, and fasten the three nuts provided to
the standoff posts on the bottom of the MVME5100 host board.
9. Reinstall the MVME5100 assembly in its proper card slot. Be sure
the host board is well seated in the backplane connectors. Do not
damage or bend connector pins.
damage or bend connector pins.
10. Replace the chassis or system cover(s), reconnect the system to the
AC or DC power source, and turn the equipment power on.
RAM500 Connectors
RAM500 memory expansion modules are populated with one or two
connectors. If the module is to be used in tandum with a second RAM500
module, the “bottom” module will have two connectors: one to mate with
the MVME5100 host board (P1), and one to mate with the “top” RAM500
module (J1). The “top” RAM500 module has only one connector, since it
needs to mate only with the RAM500 module directly underneath it and
because an added connector on a tandum RAM500 configuration would
exceed the height limitations in some backplanes. If only one RAM500
module is being used, a top module, single connector configuration is used.
connectors. If the module is to be used in tandum with a second RAM500
module, the “bottom” module will have two connectors: one to mate with
the MVME5100 host board (P1), and one to mate with the “top” RAM500
module (J1). The “top” RAM500 module has only one connector, since it
needs to mate only with the RAM500 module directly underneath it and
because an added connector on a tandum RAM500 configuration would
exceed the height limitations in some backplanes. If only one RAM500
module is being used, a top module, single connector configuration is used.
A 4H plug and receptacle are used on both boards to provide a 4 millimeter
stacking height between dual RAM500 cards and the host board.
stacking height between dual RAM500 cards and the host board.
The following subsections specify the pin assignments for the connectors
on the RAM500.
on the RAM500.
Bottom Side Memory Expansion Connector (P1)
The bottom side connector on the RAM500 is a 140-pin AMP 0.6mm Free
Height mating plug. This plug includes common ground contacts that mate
with standard AMP receptacle assemblies or AMP GIGA assemblies with
ground plates. A single memory expansion module will have 1 bank of
SDRAM for a maximum of 256Mbytes of memory. Attaching a second
memory module to the first module will provide 2 banks of SDRAM with
a maximum of 512Mbytes.
Height mating plug. This plug includes common ground contacts that mate
with standard AMP receptacle assemblies or AMP GIGA assemblies with
ground plates. A single memory expansion module will have 1 bank of
SDRAM for a maximum of 256Mbytes of memory. Attaching a second
memory module to the first module will provide 2 banks of SDRAM with
a maximum of 512Mbytes.