Appendix E
Common Questions
E-4
ni.com
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The
ACC
LED indicates that the VXI-8340 is decoding a VXI cycle.
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The
TX/RX
LEDs indicate that the VXI-8340 is receiving data
through the MXI port when green and transmitting data through the
MXI port when yellow.
What kind of signal is CLK10 and what kind of signal do I need for an
external CLK10?
CLK10 is a differential ECL signal on the VXIbus backplane. However, the
oscillator for the VXI-8340 series and the EXT CLK input from the front
panel use TTL. Therefore, supply a TTL-level signal for EXT CLK, and
our voltage converters will convert the signal to differential ECL.
What are shared memory and dual-ported memory?
These terms refer to a block of memory that is accessible to both a
client and a server. The memory block operates as a message buffer for
communications. Shared memory is applicable only if you are using either
A24 or A32 address space.