Specifications

17 January 1997 – Subject to Change
Functional Description 4–13
Interrupts
1
IPL = interrupt priority level (fixed)
Table 4–1 AlphaPC 164 System Interrupts
21164 Interrupt IPL
1
Suggested Usage AlphaPC 164 Usage
cpu_irq<0>
20 Corrected system error Corrected ECC error and
sparse space reserved encod-
ings detected by CIA
cpu_irq<1>
21 — PCI and ISA interrupts
cpu_irq<2>
22 Interprocessor and
timer interrupts
TOY clock interrupt
cpu_irq<3>
23 — Reserved
pwr_fail_irq
30 Powerfail interrupt Reserved
sys_mch_chk_irq
31 System machine check
interrupt
SIO NMI and CIA errors
mch_hlt_irq
— Halt Reserved