Syntax
port_direction [port_size]port_name,port_name,...;port_direction is declared as:
inputfor scalar or vector input ports.outputfor scalar or vector output ports.inoutfor scalar or vector bi-directional ports.port_size is a range from
[msb:lsb](most-significant-bit to least-significant-bit).
- The msb and lsb must be literal integers, integer parameters, or an expression that resolves to an integer constant.
- Either little-endian convention (the lsb is the smallest bit number) or big-endian convention (the lsb is the largest bit number) may be used.
- The maximum port size may be limited, but will be at least 256 bits.
Examples
Notes
input a,b,sel;3 scalar ports output [7:0] result;little endian convention inout [0:15] data_bus;big endian convention input [15:12] addr;msb:lsb may be any integer parameter word = 32;
input [word-1:0] addr;constant expressions may be used