VXI Technology, Inc.
28
SMP7500 Programming
Offset Register - Read and Write
D15-D0
A24/A32 Memory Offset
The value written to this 16-bit register, times 256, sets the base
address of the A24 memory space used by the module. The value
written to this 16-bit register, times 65,536, sets the base address of
the A32 memory space used by the module. A read from this register
reflects the previously written value. Because of the required
memory size, bits D4-D0 are disregarded on writes and always read
back as 0s. Upon receiving a hard reset, all bits in this register are set
to 0s. A soft reset does not effect the value in this register.
Serial Number High Register- Read Only
D15-D0
Not Implemented
Always read back as FFFF
16
Serial Number Low Register - Read Only
D15-D0
Not Implemented
Always read back as FFFF
16
Version Number Register - Read Only
D15-D8
Firmware Version
Number
Not applicable, reads back as FF
16
D7-D4
Major Hardware Version
Number
Depends on the specific hardware revision of the SMIP
II
interface
board.
D3-D0
Minor Hardware Version
Number
Depends on the specific hardware revision of the SMIP
II
interface
board.
Interrupt Status Register - Read Only
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 FF
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 effected by a read of this register.
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