Vax 613 0S Instruction Manual Page 51

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3.2.1 Interrupt Register (IR)—1.E000.0000
The interrupt register holds the interrupt reasons for machine check interrupts
and I/O interrupts. Its bits are clear on initialization. The register’s format and
contents are:
05 04 03 02 01 0029 28 27 2631 30
M
P
B
P
T
C
T
T
C
O
B
C
T
I
O
I
S
C
I
S
F
I
U
U
U
U
MR−0065−93RAGS
Bit Access Description
0 NA Unused
1 NA Unused
2 R Smart frame buffer (SFB) Interrupt. Sets when the SFB applications-
specific integrated circuit (SFB ASIC) interrupts. Cleared when the
interrupt condition is cleared at the appropriate interrupt bit in the SFB
ASIC.
3 R SCSI Interrupt. Sets when the TCDS ASIC interrupts on
TURBOchannel. Cleared when the interrupt condition is cleared at
the appropriate interrupt bit in the TCDS ASIC.
4 R IOCTL Interrupt. Sets when a TURBOchannel option asserts its
interrupt line. This bit is the OR of all interrupts logged in the IOCTL
ASIC’s system interrupt register. The two TURBOchannel option slot
interrupts are part of system interrupt register.
Cleared when the appropriate bit in the system interrupt register OR
TURBOchannel option slot is cleared.
27 R/W1C
1
BCTagPE. Sets when a Bcache Tag parity error is detected during
a transaction involving the Bcache. Cleared by writing 1 to this bit.
Initializes to 0.
28 R/W1C
1
TC Overrun Err. Sets when a TURBOchannel DMA read or write
transaction crosses an aligned 2K Byte address boundary. The
TURBOchannel slot involved in transaction is stored in TCSR. Cleared
by writing a 1 to this bit. Initializes to zero.
29 R/W1C
1
TC Timeout Error. Sets when an I/O access to the TURBOchannel results
in a timeout condition. The timeout duration is approximately 14
s. The
number of THE TURBOchannel slot involved in the transaction is stored
in TCSR. Cleared by writing 1 to the bit. Initializes to zero.
30 R/W1C
1
Bcache parity error. Sets when a parity error is detected during a
TURBOchannel DMA read that causes data to be returned from cache
rather than memory. The number of the TURBOchannel slot involved
in the transaction is stored in TCSR. Cleared by writing 1 to the bit.
Initializes to zero.
31 R/W1C
1
Memory parity error. Sets when a parity error is detected during
TURBOchannel DMA read from memory. It indicates a parity error
in a memory SIMM. The number of TURBOchannel slot involved in
transaction is stored in TCSR. Cleared by writing 1 to the bit. Initializes
to zero.
1
W1C = Cleared when 1 written.
TURBOchannel I/O Registers 3–3
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