User`s manual

A–4 RabbitCore RCM2100 Specifications RabbitCore RCM2100 Series
A.1.1 Headers
The RabbitCore 2000 uses headers at J1, J2, and J3
for physical connection to other boards. J1 and J2
are 2 × 20 SMT headers with a 2 mm pin spacing.
J3 is a 2 × 5 header with a 2 mm pin spacing.
Figure A–2 shows the layout of another board for
the RabbitCore RCM2100 to be plugged in to.
These values are relative to the header connectors.
Hole diameters of 0.035 inches are recommended
for the user board that the RabbitCore RCM2100
will be plugged into.
A.1.2 Physical Mounting
A 9/32” (7 mm) standoff with a 4-40 screw is rec-
ommended to attach RabbitCore RCM2100 to a
user board at the hole position shown in Figure A–2.
A standoff with a screw may also be used at the hole
position close to the RJ-45 Ethernet connector for a
second anchor, or you may opt to have a nut and bolt
with a wire at this hole position if you removed resis-
tor R5 and elected to ground the RJ-45 Ethernet con-
nector to the chassis.
A.2 Bus Loading
You must pay careful attention to bus loading when
designing an interface to the RabbitCore RCM2100.
This section provides bus loading information for
external devices.
Table A –3 lists the capacitance for the various Rab-
bitCore 2000 I/O ports.
Figure A–2: User Board Footprint for RabbitCore RCM2100
J1
1.125
(28.58)
2.375
(60.33)
J2
J3
1.985
(50.42)
0.079
(2.0)
1.495
(37.98)
0.870
(22.10)
0.120 dia
(3.05)
0.020 sq typ
(0.5)
0.079
(2.0)
Table A –3: Capacitance of Rabbit 2000 I/O Ports
I/O Ports
Input
Capacitance
(pF)
Output
Capacitance
(pF)
Parallel Ports A to E 12 14
Data Lines BD0–BD7 10 12
Address Lines BA0–BA12 4 8