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Datasheet of 101-1274 - KIT DEV STANDARD RCM5700
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MiniCore RCM5700/RCM6700 User’s Manual
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62
B.3 Ethernet
B.3.1 RJ-45
The Ethernet filter circuit is different between the Rabbit 5000 and Rabbit 6000 Ethernet designs.
If an RJ-45 jack is present on the MiniCore, then the appropriate circuitry is on the MiniCore. If
the interface board Ethernet RJ-45 is to be used, then a given interface board will support Ethernet
only for either the RCM5700 or RCM6700 family, but not both. The interface board supplied in
the Development Kit is properly configured for the MiniCore in the kit.
B.3.2 RCM6700 LEDs
The RCM6700/RCM6750 only support a single off-board Ethernet status LED, unlike the
RCM5700/RCM5750 which support two (LINK and ACT). The signal used as ACT on the
RCM5700 is replaced with +2.5 V for the Ethernet circuitry on the RCM6700. To provide the
same information, a combined LINK+ACT signal is used: off means no link, on means link, and
blink means activity. The on-board Ethernet LEDs on the RJ-45 jack behave identically in both
the RCM5700 and RCM6700.
If the RCM5700’s two-LED configuration is desired for a RCM6700-based design, the behavior
of the LINK+ACT signal must be changed to just LINK, and a GPIO pin must be assigned as the
ACT signal. The Interface Board is designed to support either PE3 or PE5 as the ACT signal, and
can be configured by defining macros and placing jumpers as shown in Table B-2.
Table B-2. Interface Board Ethernet LED Configuration for RCM6700
Mode
Behavior
JP3
Setting
Macros to define
Single LED
LINK off is no link
LINK on is link, blink
off for activity
4–6
None (default behavior)
Dual LEDs,
ACT is PE3
LINK off is no link
LINK on is link
ACT off is no activity
ACT on is activity
(matches RCM5700)
1–3
4–6
ENET_ACTIVITY_ON_PE3
Dual LEDs,
ACT is PE5
1–2
4–6
ENET_ACTIVITY_ON_PE5
The Ethernet LEDs are under software control on the RCM6700, so other configurations are pos-
sible as well. See the RCM6700-specific section of
LIB\Rabbit4000\TCPIP
folder for more
details.
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