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The disadvantages of specifying parameter assignments using defparam are:
- Parameter is essentially specified by the scope of hierarchies underneath which it exists. If a particular module gets ungrouped in its hierarchy, [sometimes necessary during synthesis], then scope to specify the parameter is lost and is unspecified.
- For instance, if a module is instantiated in a simulation testbench and its internal parameters are then overridden using hierarchical defparam constructs (For instance, defparam U1.U_fifo.width = 32;). Afterwards, when this module is synthesized, internal hierarchy within U1 may no longer exist in gate-level netlist, relying upon synthesis strategy chosen. Hence post-synthesis simulation would fail on the hierarchical defparam override.
Unlink() is a function for file system handling. It will easily delete the file in context. Unset() is a function for variable management. It will create a variable undefin
describe the block diagram of a system showing the following microprocessor memory system buses
A global variable is a variable A global variable is declared outside the body of each function.
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