Circuit type recognition


Pull-up / pull-down resistors

Other issues in the interconnect verification are pull-up / pull-down circuits and IO standards which complicate verification. You want to make sure that there is only one pull-down (or pull-up) resistor on a signal line when a board is placed in the system.

ConnTrace analyzes the netlist and determines the power / ground signals and locates the pull-up and pull-down resistors. The resistors are shown in the netlist trace. The pull-up voltage (when determined) is shown between parenthesis.

Looking over resistors

Some IO standards require the use of a series resistor in the signal line. Often one of the nets at the 2 sides of the resistor receives an internal (system generated) net name. Like $1N2129, while the other side has a logical name like MainClk1_p. In this case ConnTrace will use the logical (meaningful) name instead of the internal name.

In the trace view this is shown as: $1N2129 (→MainClk1_p)

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