Question

Packed arrays can have an arbitrary number of dimensions; though they are eventually always equivalent to a one-dimensional packed array and treated as such. If the packed part of an array in the type of a formal argument in SystemVerilog is specified as multi-dimensional, the SystemVerilog compiler linearizes it. Although the original ranges are generally preserved for open arrays, if the actual argument has a multidimensional packed part of the array, it shall be normalized into an equivalent one-dimensional packed array.

NOTE—The actual argument can have both packed and unpacked parts of an array; either can be multidimensional.