101-1226 Rabbit Semiconductor, 101-1226 Datasheet - Page 34

• Manufacturer Part Number: 101-1226
• Description: RCM3900 DEV KIT UNIVERSAL
• Manufacturer: Rabbit Semiconductor
• Series: RabbitCore 3900r
• Type: MPU Moduler

Specifications of 101-1226

• Contents: RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
• For Use With/related Products: RCM3900
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1137

4.2.2 Ethernet Port
Figure 7 shows the pinout for the RJ-45 Ethernet port (J3). Note that some Ethernet
connectors are numbered in reverse to the order used here.
The RJ-45 connector is shielded to minimize EMI effects to/from the Ethernet signals.
The Ethernet chip supports auto MDI/MDIX on the Ethernet port to choose the Ethernet
interface automatically based on whether a crossover cable or a straight-through cable is
used in a particular setup. The Ethernet chip may spike the current draw by up to 200 mA
while it is searching to determine the type of Ethernet cable. This search is repeated every
second if no Ethernet cable is detected. If you do not plan to connect an Ethernet cable,
use the Dynamic C
pd_powerup()
These function calls are described in the Dynamic C TCP/IP User’s Manual, Volume 1.
RabbitCore RCM3900 User’s Manual
Three LEDs are placed next to the RJ-45 Ethernet
jack, one to indicate Ethernet link/activity (
ACT
nected to a functioning 100Base-T network (
and one (
net connection is in full-duplex mode (steady on) or
that a half-duplex connection is experiencing colli-
sions (blinks).
The transformer/connector assembly ground is con-
nected to the RCM3900 printed circuit board digital
ground via a ferrite bead, L1, as shown in Figure 8.
), one to indicate when the RCM3900 is con-
FDX/COL
function call is available to turn the Ethernet chip back on at a later time.
pd_powerdown()
) to indicate whether the Ether-
Figure 7. RJ-45 Ethernet Port Pinout
function call to turn off the Ethernet chip. The
ETHERNET
LNK/
SPD
),
Figure 8. Ferrite Bead Isolation
34