Chapter 5 Input/Output Interfaces
5.9 NETWORK INTERFACE CONTROLLER
These systems provide 10/100/1000 Mbps network support through a Broadcom BCM5782
network interface controller (NIC), a PHY component, and a RJ-45 jack with integral status
LEDs. (NOTE: The 82562-equivalent controller integrated into the 82801 ICH component is not
used (disabled) in these systems. (Figure 5-14). The support firmware for the BCM5782
component is contained in the system (BIOS) ROM. The NIC 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.
RJ-45
Connector
Active/
Link
(Green)
Speed
(Yellow)
TX/RX
LAN I/F
PCI
Bus
Broadcom
BCM5782
NIC
TX/RX
ICH5
LED Function
Green Activity/Link: Indicates network activity and link pulse
reception.
Yellow Speed: Indicates link detection in 100 MB/s mode
(always on if 100Base-Tx is forced).
Figure 5-14. Network Interface Controller Block Diagram
The Network Interface Controller includes the following features:
♦ Dual high speed RISC controllers with 16-KB caches.
♦ Triple-mode support with auto-switching between 10BASE-T, 100BASE-TX, and
1000BASE-T.
♦ Power management support for ACPI 1.1, PXE 2.0, WOL, ASF 1.0, IPMI
♦ Cable testing capability
♦ Link and Activity LED indicator drivers
The controller features high and low priority queues and provides priority-packet processing for
networks that can support that feature. The controller’s micro-machine processes transmit and
receive frames independently and concurrently. Receive runt (under-sized) 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.
5-34 hp compaq d330 and d530 Series of Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition – June 2003
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