Mixed packed and unpacked array

[dave_59]

Difference between Packed and UnPacked Arrays

When you declare an array, there are two types of dimensions: packed and unpacked. For example, imagine you have a variable that is 12 bits wide: bit[11:0] avar; Now, say that you want to treat these 12 bits as 3 groups of 4 bits: bit[2:0][3:0] a_packed_array; The array index that is next to the type is called the “packed” dimensions. In memory, the bits are all “packed” together as 12 bits, but you can now address them as if they are 3 groups of 4 bits: a_packed_array[1] = 4’b1010; // Se…