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+
+In this directory contains an example for generating a spice output using two
+different spice modes, normal analog transient simulation and event-driven
+digital simulation as supported by ngspice xspice sub-module.
+
+Each test bench can be run separately by either running:
+
+- testbench.sh, to start analog simulation or
+- testbench_digital.sh for mixed-signal digital simulation.
+
+The later case also includes pure verilog simulation using the iverilog
+and gtkwave for comparison.
+