Vax 613 0S Instruction Manual Page 65

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3.3.7 Interrupt Register (IR)—1.D480.0000
The interrupt register holds the interrupt reasons for machine check interrupts
and I/O interrupts.
Note
Reading dense space 1.C240.0000 reads the interrupt mask register.
Reading the corresponding sparse space 1.D480.0000 reads the interrupt
register.
The registers format and contents are:
0009 0821 20 19 1829 28 27 26 25 24 23 2231 30
MR−0074−93RAGS
P
E
I
A
N
V
T
L
T
O
D
B
E
S
B
E
T
E
R
T
P
E
T
C
R
X
2
K
D
B
F
S
E
O
TC INT<8:0>UU
Bits Access Init. Interrupt Description
8:0 R 0 I/O TURBOchannel interrupt lines corresponding to
IOSLOT register
18:9 UNP Reserved
19 R 0 Uncorrected Second error occurred
20 R 0 Uncorrected DMA buffer error (over/under flow)
21 R 0 Uncorrected DMA cross 2K boundary
22 R 0 Uncorrected TURBOchannel reset in progress (status only)
23 R 0 Uncorrected TURBOchannel parity error
24 R 0 Uncorrected DMA tag error
25 R 0 Corrected Single-bit error on I/O write or DMA read
operation
26 R 0 Uncorrected Double-bit error on I/O write or DMA read
operation
27 R 0 Uncorrected TURBOchannel timeout on I/O request
28 R 0 Uncorrected DMA block too long (exceeds 128 LW limit)
29 R 0 Uncorrected Invalid I/O address
30 R 0 Uncorrected Scatter/gather invalid on DMA
31 R 0 Uncorrected Scatter/gather parity error
TURBOchannel I/O Registers 3–17
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