Intel 41210 User Manual
54
Intel
®
41210 Serial to Parallel PCI Bridge Developer’s Manual
Interrupt Support
7.2
Interrupt Routing for Devices behind a Bridge
, to get the best legacy interrupt
performance (by reducing interrupt sharing), adapter boards must select the appropriate INTA#–
INTD# input pin to use on each PCI bus segment. The chosen interrupt input also imposes a PCI
device number requirement for the interrupt source as shown in
INTD# input pin to use on each PCI bus segment. The chosen interrupt input also imposes a PCI
device number requirement for the interrupt source as shown in
§ §
Table 24.
Interrupt Binding for Devices behind a Bridge
Device Number on
Secondary Bus
Interrupt Pin on Device
Interrupt Pin on the Intel
®
41210
Serial to Parallel PCI Bridge
, 4, 8
, 12, 16, 20, 24, 28
INTA#
INTA#
INTB#
INTB#
INTC#
INTC#
INTD#
INTD#
1, 5, 9
, 13, 17, 21, 25, 29
INTA#
INTB#
INTB#
INTC#
INTC#
INTD#
INTD#
INTA#
2, 6, 10
, 14, 18, 22, 26, 30
INTA#
INTC#
INTB#
INTD#
INTC#
INTA#
INTD#
INTB#
3, 7, 11
, 15, 19, 23, 27, 31
INTA#
INTD#
INTB#
INTA#
INTC#
INTB#
INTD#
INTC#
NOTES:
1. Device number 0 is reserved for the bridge and must not be assigned to secondary devices.
2. AD[27:24], which correspond to devices[11:8], must not be used for IDSEL# connections, because these
2. AD[27:24], which correspond to devices[11:8], must not be used for IDSEL# connections, because these
signals are used when accessing the extended configuration space in the bridge from the secondary bus.