Eclipse - Fujitsu Ten D2140 technical manual PCI bus interrupts - Selecting correct PCI slot

Adding PCI cards

PCI bus interrupts - Selecting correct PCI slot

To achieve optimum stability, performance and compatibility, avoid the multiple use of ISA i IRQs or PCI IRQ Lines (IRQ sharing). Should IRQ sharing be unavoidable, then all

involved devices and their drivers must support IRQ sharing.

PCI IRQ Lines connect AGP slots, PCI slots and onboard components to the interrupt controller. PCI IRQ Lines are permanently wired on the mainboard.

Which ISA IRQs are assigned to the PCI IRQ Lines is normally automatically specified by the BIOS (see description in "BIOS Setup").

Monofunctional expansions cards:

Standard AGP and PCI expansion cards require a maximum of one interrupt, which is called the PCI interrupt INT A. Expansion cards that do not require an interrupt can be installed in any desired slot.

Multifunctional expansion cards or expansion cards with integrated PCI-PCI bridge:

These expansion cards require up to four PCI interrupts: INT A, INT B, INT C, INT D. How many and which of these interrupts are used is specified in the documentation provided with the card.

The assignment of the PCI interrupts to the PCI IRQ Lines is shown in the following table:

											Controller or slot INT
				On board controller														Mechanical slot
Chip																	1	2		3
set	USB 1.1							USB 2.0					AC97						PCI slot
INT										IDE			Audio	Modem		LAN
LINE	1st		2nd			3rd											1	2		3
1 (A)	-	-			-		-		+			-		-	-		B	C		D	-	-	-
2 (B)	-	-			-		-		-			-		-	-		C	D		A	-	-	-
3 (C)	-	-			-		-		-			+		+	-		D	A		B	-	-	-
4 (D)	-	-			-		-		-			-		-	+		A	B		C	-	-	-
5 (E)	+	-			-		-		-			-		-	-		-	-	-		-	-	-
6 (F)	-	+			-		-		-			-		-	-		-	-	-		-	-	-
7 (G)	-	-			+		-		-			-		-	-		-	-	-		-	-	-
8 (H)	-	-			-		+		-			-		-	-		-	-	-		-	-	-

Use the first PCI slots that have a single PCI IRQ Line (no IRQ sharing). If you must use another PCI slot with IRQ sharing, check whether the expansion card properly supports IRQ sharing with the other devices on this PCI IRQ Line. The drivers of all cards and components on this PCI IRQ Line must also support IRQ sharing.

A26361-D2140-Z120-1-7419, edition 1 English - 21