pluto_hdl_adi/library/axi_dmac/splitter.v

// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// Each core or library found in this collection may have its own licensing terms. 
// The user should keep this in in mind while exploring these cores. 
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module splitter (
  input clk,
  input resetn,

  input s_valid,
  output s_ready,

  output [NUM_M-1:0] m_valid,
  input [NUM_M-1:0] m_ready
);

parameter NUM_M = 2;

reg [NUM_M-1:0] acked;

assign s_ready = &(m_ready | acked);
assign m_valid = s_valid ? ~acked : {NUM_M{1'b0}};

always @(posedge clk)
begin
  if (resetn == 1'b0) begin
    acked <= {NUM_M{1'b0}};
  end else begin
    if (s_valid & s_ready)
      acked <= {NUM_M{1'b0}};
    else
      acked <= acked | (m_ready & m_valid);
  end
end

endmodule