cExpress-AL
System Resources 45
I/O Address
IOSF Primary
Target
IOSF SB Target
0B8h–0B9h P2SB ITSS (interrupt)
0BCh–0BDh P2SB ITSS (interrupt)
0C0h–0DFh P2SB Terminate
0F0h P2SB Terminate
170h–177h P2SB Terminate
2F8h–2FFh P2SB Serial Port
240h–24Fh P2SB Serial Port
2F8h–2FFh P2SB Serial Port
376h P2SB Terminate
3F6h P2SB Terminate
3F8h–3FFh P2SB Serial Port
4D0h–4D1h P2SB ITSS (interrupt)
CF9h P2SB ITSS (CPU I/F)
6.3. Interrupt Request (IRQ) Lines
PIC Mode
IRQ# Typical Intterupt Resource Connected to Pin Available
0 Counter 0 N/A No
1 Keyboard controller IRQ1 via SERIRQ No
2 Cascade interrupt from slave PIC N/A No
3 Serial Port 4 (COM3) IRQ3 via SERIRQ / PIRQ Note (1)
4 Serial Port 3 (COM4) IRQ4 via SERIRQ / PIRQ Note (1)
5 Generic IRQ5 via SERIRQ / PIRQ Note (1)
6 Generic IRQ6 via SERIRQ / PIRQ No
7 Generic IRQ7 via SERIRQ / PIRQ Note (1)
8 Real-time clock N/A No
9 Generic N/A Note (1)
10 Serial Port 1 (COM1) IRQ10 via SERIRQ / PIRQ Note (1)
11 Serial Port 2 (COM2) IRQ11 via SERIRQ / PIRQ Note (1)
12 PS/2 Mouse IRQ12 via SERIRQ / PIRQ Note (1)
13 Math Processor N/A No
14 SATA Primary IRQ14 via SERIRQ / PIRQ Note (1)
15 SATA Secondary IRQ15 via SERIRQ / PIRQ Note (1)
Note (1): These IRQs can be used for PCI devices when onboard device is disabled.
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