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SE7500CW2 Server Board Technical Product Specification
Included PCI Devices
21
Revision 1.40
•
4 pin header for off board LEDs
Pin-out for the card is as follows:
Table 6. Optional Intel® 53C1000B1 SCSI card pin-out(J1)
Pin
Signal Name
1
+5V
2
LED1_L
3
LED1_L
4
+5V
4.5 Interrupt Routing
The SE7500CW2 interrupt architecture accommodates both PC-compatible PIC mode and
APIC mode interrupts through use of the integrated I/O APICs in the ICH3-S.
4.5.1
Legacy Interrupt Routing
For PC-compatible mode, the ICH3-S 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 ICH3-S contains configuration registers
that define which interrupt source logically maps to I/O APIC INTx pins.
Interrupts, both PCI and IRQ types, are handled by the ICH3-S.
The ICH3-S then translates these
to the APIC bus.
The numbers in the table below indicate the ICH3-S PCI interrupt input pin to
which the associated device interrupt (INTA, INTB, INTC, INTD) is connected.
The ICH3-S’ I/O
APIC exists on the I/O APIC bus with the processors.
Table 7. PCI Interrupt Routing/Sharing
Interrupt
INT A
INT B
INT C
INT D
ATI Rage SL
ICH3_PIRQF_L
Promise ATA-100 Controller
ICH3_PIRQG_L
82550PM #2
ICH3_PIRQE_L
82550PM #1
ICH3_PIRQH_L
P64H2 BT INTR#
ICH3_PIRQC# (for PIC mode)
P64-C Slot 1
P1_IRQ0_L
P1_IRQ1_L
P1_IRQ2_L
P1_IRQ3_L
P64-B Slot 2
P2_IRQ0_L
P2_IRQ1_L
P2_IRQ2_L
P2_IRQ3_L
P64-B Slot 3
P2_IRQ4_L
P2_IRQ5_L
P2_IRQ6_L
P2_IRQ7_L
P32-A Slot 4
ICH3_PIRQB_L
ICH3_PIRQC_L
ICH3_PIRQB_L
ICH3_PIRQC_L
P32-A Slot 5
ICH3_PIRQD_L
ICH3_PIRQA_L
ICH3_PIRQD_L
ICH3_PIRQA_L