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Appendix I Compaq/Intel Network Interface Controller Adapters
Compaq Personal Computers
Original - December 2000
I-2
I.2 FUNCTIONAL DESCRIPTION
The Intel PRO/100+ and the PRO/100 S Management Adapters are based on the Intel 82559 and
82550 Ethernet Controllers (respectively) supported by firmware in flash ROM (Figure I-2). Each
adapter can operate in half- or full-duplex modes and provides auto-negotiation of both mode and
speed. Half-duplex operation features an Intel-proprietary collision reduction mechanism while
full-duplex operation follows the IEEE 802.3x flow control specification. Transmit and receive
FIFOs of three kilobytes each reduce the chance of overrun while waiting for bus access. Each
card includes an on-board 5/3.3 VDC regulator circuit and WOL connector in support of Wake-
On-LAN functionality.
Controller Type Featured on
82559 Intel PRO/100+ Management Adapter
82550 Intel PRO/100 S Management Adapter
Figure I-2. Intel PRP/100+ Management Adapter, Block diagram
Key features of these adapters include:
♦ 3-KB transmit and 3-KB receive FIFOs
♦ PCI ver. 2.2 compliant (PME- support)
♦ Dual-mode support with auto-switching between 10BASE-T and 100BASE-TX
♦ Both APM and ACPI power management support
♦ D0-D3 power state wake event support
♦ Boot ROM with PXE and RPL support
The 82559 and 82550 controllers feature high and low priority queues and provides priority-packet
processing for networks that support that feature. The controller’s micro-machine processes
transmit and receive frames independently and concurrently. Receive runt (undersized) frames are
not passed on as faulty data but discarded by the controller, which also directly handles such errors
as collision detection or data under-run. An EEPROM is used to store identification, configuration,
and connection parameters.
The 82550 controller provides all the functionality of the 82559 plus IP security (IPSEC) support
through a hardware accelerator engine.
WOL
Conn.
Intel
825xx
Ethernet Controller
(see table below)
32-Bit
PCI
PCI
Connector
5/3.3
VDC
Reg.
BIOS
ROM
TX/RX
Speed
RJ-45
Conn.
TX/RX
PHY
Link/
Activit
y
WOL
GND
5 VDC Aux
3.3 VDC
1
2
3