Ethernet Interface - ADLINK Technology CoreModule 430 Reference Manual

Chapter 3
Table 3-10. Utility Interface Pin/Signal Descriptions (J5) (Continued)
9 BATV+
10 MCLK
Notes: The shaded table cells denote power or ground. The * symbol indicates the signal is Active Low.

Ethernet Interface

The Ethernet solution originates from the Vortex 86SX/DX CPU and consists of both the Media Access
Controller (MAC) and the physical layer (PHY) combined into a single component solution. The Vortex Fast
Ethernet Control Unit is a 32-bit PCI controller that features enhanced scatter-gather bus mastering
capabilities, which enables the processor to perform high-speed data transfers over the internal PCI bus. The
bus master capabilities enable the component to process high-level commands and perform multiple
operations, thereby off-loading communication tasks from the CPU. The Ethernet interface offers the
following features:
•
Full duplex or half duplex support
•
Full duplex support at 10 Mbps or 100 Mbps
•
In full duplex mode, the Ethernet controller adheres to the IEEE 802.3x Flow Control specification.
•
In half duplex mode, performance is enhanced by a proprietary collision reduction mechanism.
•
IEEE 802.3 10/100BaseT compatible physical layer to wire transformer
•
Two on board LEDs support the speed and the link & activity status
•
IEEE 802.3u Auto-Negotiation support
•
Fast back-to-back transmission support with minimum interframe spacing (IFS).
•
IEEE 802.3x auto-negotiation support for speed and duplex operation
•
3 kB transmit and 3 kB receive FIFOs (helps prevent data underflow and overflow)
•
IEEE 802.3x 100BaseTX flow control support
•
On-board magnetics (Ethernet isolation transformer)
Table 3-11 describes the pin signals of the Ethernet interface, which uses a single-row, 8-pin header with
0.100" (2.54mm) pitch.
Table 3-11. Ethernet Interface Pin/Signal Descriptions (J2)
Pin # Signal
1 TX+
2 TX-
3 RX+
6 RX-
4 CT
5 CT
7 CT
8 CT
NOTE The magnetics (isolation transformer, U12) for the Ethernet connector is
included on the CoreModule 430.
CoreModule 430
Real time battery voltage (3.0V Max) input
Mouse Clock input
Description
Analog Twisted Pair Ethernet Transmit Differential Pair – These pins transmit the
serial bit stream through the isolation transformer.
Analog Twisted Pair Ethernet Receive Differential Pair – These pins receive the
serial bit stream through the isolation transformer.
Center Tap – Connected through two 75 ohm resistors in series to center tap of
isolation transformer and then to ground through common 1k PF capacitor.
Center Tap – Connected through two 75 ohm resistors in series to center tap of
isolation transformer and then to ground through common 1k PF capacitor.
Reference Manual
Hardware
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