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Prepared
Manfred Ortmann
Approved
2.2.6 Ethernet
At the RJ45 connector X600 the Ethernet interface is available.
The Ethernet interface is implemented with the 10/100 Ethernet controller LAN9218 ( U600 )
from SMSC. The LAN9218 is connected to the 32-Bit processor interface of the CPU.
The LAN9218 is fully IEEE 802.3 10BASE-T and 802.3u 100BASE-TX compliant and supports
HP Auto-MDIX. The LAN9218 includes an integrated Ethernet MAC and PHY, large transmit
and receive data FIFOs with a high-speed host bus interface to accommodate high bandwidth
and high latency applications.The LAN9218 also supports features which reduce or eliminate
packet loss. Its internal 16-kByte SRAM can hold over 200 received packets. If the receive
FIFO gets too full, the LAN9218 can automatically generate flow control packets to the remote
node or assert back-pressure on the remote node by generating network collision.
The default ethernet setting by pin strapping at the SPD_SEL pin of U600 is speed 100 Mbps,
half-duplex and auto negotation enabled because this pin will be strapped to VCC by the 10k
Ohm resistor R609.
It is possible to strap this pin to ground by a 0 Ohm resistor R612 then the settings would be
speed 10 Mbps, half-duplex and auto negotiation disabled.
The FIFO_SEL pin of U600 can be strapped by 0 Ohm resistor R613 to ground.
If this resistor is not populated the FIFO_SEL pin is strapped by the 10k Ohm resistor R610 to
VCC then all accesses to U600 are to the RX or TX data FIFO and the upper addresses A[7:3]
are ignored.
As default the AMDIX_EN pin of U600 is strapped by the 10k Ohm resistor R611 to VCC so
Auto-MDIX is enabled. That means if the user plugs in either a direct connect LAN cable or a
cross-over patch cable U600 is capable of configuring the TPO and TPI twisted pair pins for
correct transceiver operation.
It is possible to strap this pin to ground by a 0 Ohm resistor R614 then Auto-MDIX is disabled.
Preliminary
Document Number
Checked
Date
2008-05-14
Revision
Storage
PA 3.5
Mycable01
20(36)
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