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Distributor of Digi International: Excellent Integrated System Limited
Datasheet of 101-0533 - KIT DEV RABBIT3000/RCM3100
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A.2 Bus Loading
You must pay careful attention to bus loading when designing an interface to the
RCM3100. This section provides bus loading information for external devices.
Table A-2 lists the capacitance for the various RCM3100 I/O ports.
Table A-2. Capacitance of Rabbit 3000 I/O Ports
I/O Ports
Parallel Ports A to G
Table A-3 lists the external capacitive bus loading for the various RCM3100 output ports.
Be sure to add the loads for the devices you are using in your custom system and verify
that they do not exceed the values in Table A-3.
Table A-3. External Capacitive Bus Loading -40°C to +70°C
Output Port
All I/O lines with clock
doubler enabled
All I/O lines with clock
doubler disabled
38
Input
Capacitance
(pF)
12
Clock Speed
Maximum External
(MHz)
Capacitive Loading (pF)
29.4
14.7456
Output
Capacitance
(pF)
14
30–70
100
RabbitCore RCM3100
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