3-12
AlphaServer DS20 Service Manual
3.6
Device Interrupt Request Register (DIRn, n=0,1)
These registers indicate which interrupts are pending to the CPUs and indicate
the presence of an I/O error condition.
Address
801 A000 0280 CPU0
801 A000 02C0CPU1
Access
RO
32
0
PK1418-99
31
58 57 56 55
63
ERR
00
Reserved
IRQ1 PCI interrupts pending
IRQ1 PCI interrupts pending
Table 3-6 Device Interrupt Request Register
Name
Bits
Type
Initial
State
Description
ERR
<63:62>
RO
0
IRQ0 error interrupts
<63> Cchip detected MISC <NXM>
<62> Pchip0 error
<62> Pchip1 error
RES
<61:56>
RO
0
Reserved
NXS
<55:0>
RO
0
IRQ1 PCI interrupts pending to the CPU
