Siemens PANEL PC 877 operating instructions Interrupt Assignments, Interrupt Description Comment

Detailed descriptions 17.5 System resources

17.5.2.2Interrupt Assignments

Interrupt	Description	Comment
IRQ0	System timer	fixed
IRQ1	Keyboard	fixed
IRQ4	Serial port COM1	2)
IRQ8	Real-time clock (RTC)	fixed
IRQ9	Microsoft ACPI-Compliant System	1)
IRQ13	Numeric processor	fixed
IRQ14	1. IDE channel (primary)	2)
IRQ16	Mobile Intel 915GM/GMS, 910GML	1)
	Express Chipset Family
IRQ16	Intel® 82801FB/FBM USB Universal	1)
	Host Controller - 2658
IRQ 16	Intel® 82801FB/FBM USB Universal	1)
	Host Controller -2659
IRQ 19	Intel® 82801FB Ultra ATA Storage	1)
	Controllers - 2652
IRQ 20	VIA Rhine III Fast Ethernet Adapter	2)
IRQ 22	Intel® 82801FB/FBM Universal Host	1)
	Controller - 265A
IRQ 22	Intel® 82801FB/FBM Universal Host	1)
	Controller -265B
IRQ 22	VIA Rhine III Fast Ethernet Adapter #2	2)
IRQ 23	Intel® 82801FB/FBM USB2 Enhanced	1)
	Host Controller - 265C

PCI Interrupt Lines	PCI devices interrupt assignment (PCI IRQ)
INT – A	Graphics, USB A (channel 0+1), USB B (channel 2+ 3)
INT – B	Slot 1
INT – C	Slot 2
INT – D	Serial ATA
INT – E	Ethernet 1
INT – F	MPI/DP
INT – G	Ethernet 2, USB C (channel 4+5), USB D (channel 6 + 7)
INT - H	USB 2.0

1)The on-board PCI devices require PCI interrupt channels. These interrupt channels are sharable and plug and play compatible. This means several devices can share the same interrupt. Interrupts are assigned automatically (exception: see section, Exclusive PCI Hardware Interrupt).

2)These functions can be disabled in the Setup This releases allocated resources.

17-34	SIMATIC Panel PC 877
	Operating instructions, Release 07/2006, A5E00877780-01