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Chapter 3
• Data transmission with minimum interframe spacing (IFS).
• IEEE 802.3u Auto-Negotiation support
• 3kB transmit and 3kB receive FIFOs (helps prevent data underflow and overflow)
• IEEE 802.3x 100BASE-TX flow control support
• Improved dynamic transmit chaining with multiple priorities transmit queues
• Each Ethernet port has a RJ-45 connector and the related magnetics integrated on the board.
• Each Ethernet port controller connected to Primary PCI bus
Tables 3-14 describes the pin-outs and signals of standard Ethernet port, Ethernet Port 1.
Table 3-14. Ethernet Port 1 Pin/Signal Descriptions (J16)
Pin # GND
1
TX2+
3
TX2-
4
RX2+
6
RX2-
9
ACT
11
SPEED
2, 7, 8
NC
5, 13, 14 AC GND Grounded (goes to ground through 0.1µ capacitor)
10, 12
+3VSB
Notes: The shaded area denotes power or ground.
LAN Boot
This feature, supported by both Ethernet ports on the ReadyBoard 800, is based on the Preboot
Execution Environment (PXE), an open industry standard. PXE (pronounced "pixie") was designed
by Intel, along with other hardware and software vendors, as part of the Wired for Management
(WfM) specification to improve management of desktop systems. This technology can also be applied
to the embedded system market place. PXE turns the ReadyBoard 800 Ethernet ports into boot
devices when connected over a network (LAN).
PXE boots the ReadyBoard 800 from the network (LAN) by transferring a "boot image file" from a
server. This image file is typically the operating system for the ReadyBoard 800, or a pre-OS agent
that can perform management tasks prior to loading the image file (OS). A management task could
include scanning the hard drive for viruses before loading the image file.
PXE is not operating system-specific, so the image file can load any OS. The most common
application of PXE (LAN Boot) is installing an OS on a brand new device (hard disk drive) that has no
operating system, (or reinstalling it when the operating system has failed or critical files have been
corrupted).
Using PXE prevents the user from having to manually install all of the required software on the
storage media device, (typically a hard disk drive) including the OS, which might include a stack of
installation CD-ROMs. Installing from the network is as simple as connecting the ReadyBoard to the
network and powering it on. The server can be set up to detect new devices and install software
automatically, thereby greatly simplifying the management of small to large numbers of systems
attached to a network.
If the hard disk drive should crash, the network can be set up to do a hardware diagnostic check, and
once a software-related problem is detected, the server can re-install the defective software, or all the
ReadyBoard software from the server. Booting from the network also guarantees a "clean" boot, with
44
Digital Ground
Analog Twisted Pair Ethernet Transmit Differential Pair. These pins transmit
the serial bit stream for transmission on the Unshielded Twisted Pair Cable
(UTP). These signals interface directly with an isolation transformer.
Analog Twisted Pair Ethernet Receive Differential Pair. These pins receive
the serial bit stream from the isolation transformer.
Link/Activity signal indicates a Link is established or Activity is occurring
Speed signal for 10BaseT or 100BaseT transfer rate
Not connected
+3V for plus side of LEDs
Reference Manual
Hardware
ReadyBoard 800
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