3.5.1.17.3 Return Struct By Value

SmartHLS™ supports returning a struct by value from the top-level function. In this case, the return value is always bit-packed resulting in a scalar interface. In our example, the RTL module will have a return_val port with 129 bit width (updated = 1-bit, acc = 128-bits):

module update_top
(
        clk,
        reset,
        start,
        ready,
        finish,
        return_val,
        ...
)

input  clk;
input  reset;
input  start;
output reg  ready;
output reg  finish;
output reg [128:0] return_val;
...