Can we have an array of custom modules?

verilog
John picture John · Sep 4, 2009 · Viewed 24.5k times · Source

Can we have an array of instances for a custom module?

For example: we can have input [15:0] a; - this creates a bus. Can we do same thing for custom modules, i.e. DFF [15:0] d;, where DFF is a custom module? Here I intend to create 16 instances of the DFF module.

Answer

mark4o picture mark4o · Sep 4, 2009

Verilog arrays of instances were added in Verilog-1995 (IEEE 1364-1995). They can be used with gates, user-defined primitives, and modules. Generates, which are more powerful but also more complex, were added in Verilog-2001.

Here is an example array of module instances:

DFF d[15:0] (clk, DFF_i, DFF_o);

For each port connection, if the size matches that of the formal parameter then it is connected to every instance. Otherwise each instance is connected to a part-select (or bit-select) of the expression.

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