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HDL routines for error injection

err-inj

There are times when a signal within the design has to be probed or monitored for certain tasks in the testbench. Typically these are accessed via hierarchical references and tend to break when the same code is ported to different projects because of changes in design hierarchy. UVM has a set of DPI implementation tasks for backdoor accesses that has a similar effect and achieves much better code reusability.

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