Pci Device No. And Wiring Method For Interrupts - Epson SCE8720C Series Hardware Manual

CARD-PCI/GX Hardware Manual
A.1.2 PCI device No. and wiring method for interrupts
Each device on the PCI bus must have a unique device No. The device No. is determined
by which AD[11:31] signal is connected to IDSEL signals. There are 21 device Nos. in
total, but among them AD28 and 29 are used inside SCE8720C.
How IDSELs are connected is shown in the table below. Connection of the PCI devices 1
to 3 cannot be changed. Customization of BIOS is needed in order to change them.
(A wiring example of interrupt and IDSEL is shown in the figure below.)
Table A.1 PCI device No. assignment
PCI device
Chipset (inside Geode CS5530)
USB (inside Geode CS5530)
PCI device 1
PCI device 2
PCI device 3
Wire the interrupt cables for each slot, so that load is put equally on each of INTA# to
INTD# on the PCI device. Customization of BIOS is needed in order to change them as
well.
(Note that sharing of interrupts is not available with Windows-CE.)
INTA#
INTB#
INTC#
INTD#
CARD-PCI
68
IDSEL
AD28
AD29
AD24
AD25
AD26
PCI NO1
INTA#
INTB#
INTC#
INTD#
IDSEL
AD24
Figure A.2 Wiring of interrupts
EPSON
Device No.
18 (12h)
19 (13h)
14 (Eh)
15 (Fh)
16 (10h)
PCI NO2
PCI NO3
INTA#
INTA#
INTB#
INTB#
INTC#
INTC#
INTD#
INTD#
IDSEL
IDSEL
IDSEL
IDSEL
AD25
AD26
Rev.A