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Appendix D Compaq/Intel Network Interface Controller Adapters
D.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 (see figure
below). 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.
3
2
1
3.3 VDC
WOL
GND
Link/
Activit
y
TX/RX
PHY
RJ-45
Conn.
Speed
TX/RX
BIOS
ROM
5/3.3
VDC
Reg.
PCI
Connector
32-Bit
PCI Bus
Intel
825xx
Ethernet Controller
(see table below)
WOL
Conn.
5 VDC Aux
Controller Type Featured on
82559 Intel PRO/100+ Management Adapter
82550 Intel PRO/100 S Management Adapter
Figure D-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 compliant
♦ 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.
hp/Compaq Personal Computers
Changed - April 2003
D-2