158004.B00
45
PC
IRQ
INTERNAL/
EXTERNAL
PnP AWARE?
PC/104
BUS?
ALLOCATION
0 Internal Yes
No Timer
1
On-Board
Yes
No
Keyboard in PC97317 Super I/O
chip
2
Internal
N/A
No
Cascades second 8259 chip
3
On-Board
Yes
Yes
COM2 in PC97317 Super I/O chip
4
On-Board
Yes
Yes
COM1 in PC97317 Super I/O chip
5 On-Board
Yes
(SoundBlaster)
Yes
COM3 in extra UART chip, or
SoundBlaster
(See text above).
6
On-Board
Yes
Yes
Floppy Disk drive in PC97317
7
On-Board
Yes
Yes
Printer port in PC97317 Super I/O
chip
8
On-Board
Yes
No
Alarm interrupt from RTC in
PC97317
9
On-Board
No
Yes
COM4 in extra UART chip.
10 Internal
(normally)
No
Yes
Normally allocated to Ethernet chip.
IRQ10 is present on PC/104 bus.
11 Internal
(USB) or
External (no
USB)
No, except
PnP is aware
of USB
Yes
USB default (See text above)
12
On-Board
Yes
Yes
Mouse in PC97317 Super I/O chip
13
Internal
Yes
No
Floating-Point Processor in Geode
GX1
14
On-Board
Yes
Yes
IDE Disk Drive
15 External No
Yes
TABLE 9 - INTERRUPT ALLOCATION
Note that the serial ports and printer have individual interrupt enable bits, within their
register sets. The default is for these interrupts to be disabled. This means that IRQ3,
IRQ4, IRQ5, IRQ7 and IRQ9 can be used by other PC/104 or PC/104-Plus boards if
the interrupts are not being used by the serial and printer ports. IRQ12 is available if
the mouse controller is disabled. IRQ14 is available if no IDE drives are fitted.
All the PC/104 bus interrupts are programmed to generate an interrupt on a positive-
going edge.
The Geode GX1 does not have a dedicated NMI pin, so non-maskable interrupts are
not available on the TP400’s PC/104 bus. The SERR# and PERR# pins however may
generate non-maskable interrupts, which are emulated by SMI code.
4.5.2 PC/104-Plus Bus Interrupts
The PC/104-Plus bus (PCI bus) has four interrupt pins, INTA#, INTB#, INTC# and
INTD#. These can be programmed by the BIOS Setup program to cause interrupts
on any of the fifteen IRQ levels.
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Страница 136: ...J2 164004 C03 FIGURE J1 TP400ET MECHANICAL DRAWINGS FIGURE J2 TP400ET CIRCUIT DIAGRAM ...
Страница 138: ...K2 158004 B00 FIGURE K1 TP300USB MECHANICAL DRAWINGS FIGURE K2 TP300USB CIRCUIT DIAGRAM ...