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6-16
Logic Browser
Selecting a Signal with Expressions
Verilog permits complex expressions to drive port and terminal
connections. A basic problem with complex expressions is that they
can present ambiguity in signal selection. The Connection Dialog lets
you further define the focus.
The HiConn expression and LoConn expression fields display the text
of the HiConn and LoConn port expressions for a port instance.
(Because primitive terminals do not have a LoConn, their LoConn
field is empty.)
The HiConn Signal/Value and LoConn Signal/Value lists show all of
the signals used in the port connection. For simple port connections,
there may be only a single signal/value pair. For more complex port
connections, the list displays each signal of the port expression and
that signal’s value.
The HiConn/LoConn Bit and Signal/Value lists can be very useful for
tracking connectivity problems, because they display a bit per bit, right
justified text, and mapping of the HiConn port expression to the
LoConn port expression. The list displays the least significant to most
significant bits from top to bottom. The string "***" is used as a place
holder for constants and parameters.
The HiConn Signal/Value, LoConn Signal/Value, and HiConn/
LoConn Bit/Value lists scroll in synchronization as a group.
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