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with current generation 10/100 Mbps Fast Ethernet designs. The Intel® 82541PI integrates
fourth generation gigabit MAC design with fully integrated, physical layer circuitry to provide a
standard IEEE 802.3 Ethernet interface for 1000BASE-T, 100BASE_TX, and 10BASE-T
applications (802.3, 802.3u, and 802.3ab). The controller is capable of transmitting and
receiving data at rates of 1000 Mbps, 100 Mbps, or 10 Mbps. In addition to managing MAC and
PHY layer functions, the controller provides a 32-bit wide direct Peripheral Component
Interconnect (PCI) 2.3 compliant interface capable of operating at 33 or 66MHz.
5.3.1
NIC Connector and Status LEDs
The NICs drive two LEDs located on each network interface connector.
For the NIC 1 connector, the green LED indicates network connection when on, and
Transmit/Receive activity when blinking. The yellow LED indicates 1000-Mbps operation when
lit, the green LED indicates 100-Mbps operation when lit and 10-Mbps when off.
For the NIC 2 connector (SE7221BK1LX sku only), the yellow LED indicates network
connection when on, and Transmit/Receive activity when blinking. The orange LED indicates
1000-Mbps operation when lit, the green LED indicates 100-Mbps operation when lit and 10-
Mbps when off.
5.4
Interrupt Routing
The board interrupt architecture accommodates both PC-compatible PIC mode and APIC mode
interrupts through use of the integrated I/O APICs in the ICH6.
5.4.1
Legacy Interrupt Routing
For PC-compatible mode, the ICH6 provides two 82C59-compatible interrupt controllers. The
two controllers are cascaded with interrupt levels 8-15 entering on level 2 of the primary
interrupt controller (standard PC configuration). A single interrupt signal is presented to the
processors, to which only one processor will respond for servicing. The ICH6R contains
configuration registers that define which interrupt source logically maps to I/O APIC INTx pins.
The ICH6 handles both PCI and IRQ interrupts. The ICH6R translates these to the APIC bus.
The numbers in the table below indicate the ICH6R PCI interrupt input pin to which the
associated device interrupt (INTA, INTB, INTC, INTD, INTE, INTF, INTG, INTH for PCI bus and
PXIRQ0, PXIRQ1, PXIRQ2, PXIRQ3 for PCI-X bus) is connected. The ICH6R I/O APIC exists
on the I/O APIC bus with the processors.
Interrupt
Intel® 82541PI
PCI Slot 1 (PCI 32b/33M)
PCI Slot 4 (64b/66M)/ PCI Slot 6
(64bit/100MHz) (Riser,
SE7221BK1LX sku only)
PCI Slot 5 (64b/66M
18
Table 14. PCI AND PCI-X Interrupt Routing/Sharing
INT A
PIRQC
PIRQF
PXIRQ0
PXIRQ5
SE7221BK1-E Technical Product Specification
INT B
INT C
PIRQG
PIRQE
PXIRQ1
PXIRQ2
PXIRQ6
PXIRQ7
INT D
PIRQH
PXIRQ3
PXIRQ4
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