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VXI Technology, Inc.
SM8000 Series Programming 41
Interrupt Status Register – Read Only
ADDR
Plug-In LA+0x1A
D15
Scan Function
done
The latest scan list update is complete.
D14
Openbus Active
Event true
The Openbus was activated by one or more programmed inputs.
See description of the Openbus in the module register section.
D13-D8
Modules 0-5 Busy
complete
D13 = Module 5, … and D8 = Module 0.
The programmed Busy signal from one of the modules has timed
out. This indicates that the relays actuated for that BUSY cycle
have settled and a measurement may take place.
D7-D0 Reserved Always reads back as FFFF
16
Note: This status register may be used in a polled fashion rather than allowing the events above to
generate an Interrupt. A read of this register will clear any active bits. Bits that are not set, or
are about to be set, are not affected by a read of this register.
Interrupt Control Register – Read and Write
ADDR
Plug-In LA+0x1C
D15
Scan Function
done mask bit
0 = enabled
1 = disabled
D14
Openbus Active
Event true mask bit
0 = enabled
1 = disabled
D13-D8
Module 0-5 Busy
complete
0 = enabled
1 = disabled
D13 = Module 5 … and D8 = Module 0.
D7 IR ENA*
0 = writing a 0 to this bit enables interrupter capabilities
1 = writing a 1 to this bit disables interrupter capabilities
D6 IH ENA*
The module has no interrupt handler capability, therefore writing a
1 or 0 has no effect. A 1 is always read back for this bit.
D5-D3
Interrupter IRQ
Line
The complement of the value programmed into these three bits
reflects the selected IRQ line used by the module. A value of 011
2
would select IRQ4, a value of 000
2
would select IRQ7, and a
value of 111
2
would disconnect the IRQ lines.
D2-D0 Handler IRQ Line
The module has no interrupt handler capability; therefore writing
to these bits has no effect. A 111
2
is always read back for these
bits.
Note: That all bits in this register are set to 1s upon receipt of a hard or soft reset.
Subclass Register – Read Only
ADDR
Plug-In LA+0x1E
D15
VXIbus Extended
Device
Always reads as 1.
D14-D0
Extended Memory
Device
Always reads as 7FFD
16