Specifications

080505 OPERATIONS MANUAL PPM-GX500 10
An Intel 82551ER 32-bit PCI Ethernet controller chip is used for high-speed data
transfer. It has auto-negotiation capability for speed, duplex and ow control. It
supports IEEE 802.3 10Base-T and 100Base-T in either full- or half-duplex mode at
both 10 and 100 Mbps. In full-duplex mode, it adheres to the IEEE 802.x Flow Control
Specication.
Two large 3 KB transmit and receive FIFOs help prevent data underruns and overruns.
It has fast, back-to-back transmission support with minimum interframe spacing. It also
has improved dynamic transmit chaining with multiple priority transmit queues.
The Ethernet interface is provided at Multi-I/O connector J8, which is an 80-pin high
density connector. WinSystems offers the cable CBL-251-1 to simplify the connection.
The pinout for the connector and cable is listed in detail in the cable drawing.
There are three light emitting diodes (LEDs) on the PPM-GX500 to provide a visual
indication of the link status, network activity and network speed. The yellow Link
Integrity LED is lit when a valid connection is detected. The green Activity LED blinks on
and off when activity is detected on the wire. The red LED is on if a 100Base-T link is
detected and off if a 10Base-T link is detected.
On-board Ethernet activity signals are also provided at connector J8 to allow optional
status LEDs to be mounted off-board. The Ethernet activity signals are active low and
require an external resistor to limit current to 12-16 mA.
Ethernet Controller
Visual
Index
D2 LED 0 (YELLOW) LINK INTEGRITY
D3 LED1 (GREEN) ACTIVITY
D1 LED2 (RED) SPEED
The 82551ER chip is very popular both in the commercial and industrial PC-compatible
market. This means that most PC-compatible drivers, utilities and 10/100 Ethernet
supported operating systems will work directly. The conguration information describing
the device’s architecture, address, interrupt, etc. is stored in a serial EEPROM.
NOTE: WinSystems cannot provide technical support for direct programming of the
82551ER controller. We suggest utilizing a TCP/IP stack or Network O/S that allows the
use of preexisting 82551ER drivers.
J8