Table of Contents
Advertisement
3.7 BUILT-IN-TEST
The Built-in-Test feature of the VMIVME-2131 is enabled by asserting
(setting to a logical "one") the test mode bit in the CSR. As an aid to programming
the VMIVME-2131, a jumper (H1) is available to the user. This jumper can be used
to invert the input data to the CSR of the VMIVME-2131. It is used to permit existing
software to control the VMIVME-2131. If the program used writes "zeros" to the
CSR this jumper can be setup to invert this data (since the VMIVME-2131 uses
"ones" in the CSR). This way the H1 jumper can let the user run existing software
without modifications.
While in Test Mode, data may be written to any Output Data Register and
read back on a following read operation. This way the data written can be compared
to the data read and any action necessary can be initiated. While in Test Mode,
writing to an output device will have no effect on the field equipment, because the
output drivers are disabled during Test Mode operations.
The data loopback circuitry can be used even if TEST MODE is not active.
Thus, the Built-in-Test feature of this product provides the user with the capability of
performing real-time loopback testing with the output drivers connected to the field
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
15
Advertisement
Table of Contents
