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stream_mux.sv
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stream_mux.sv
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// Copyright 2018 ETH Zurich and University of Bologna.
// Copyright and related rights are licensed under the Solderpad Hardware
// License, Version 0.51 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://solderpad.org/licenses/SHL-0.51. Unless required by applicable law
// or agreed to in writing, software, hardware and materials distributed under
// this License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
/// Stream multiplexer: connects the output to one of `N_INP` data streams with valid-ready
/// handshaking.
module stream_mux #(
parameter type DATA_T = logic, // Vivado requires a default value for type parameters.
parameter integer N_INP = 0, // Synopsys DC requires a default value for value parameters.
/// Dependent parameters, DO NOT OVERRIDE!
parameter integer LOG_N_INP = $clog2(N_INP)
) (
input DATA_T [N_INP-1:0] inp_data_i,
input logic [N_INP-1:0] inp_valid_i,
output logic [N_INP-1:0] inp_ready_o,
input logic [LOG_N_INP-1:0] inp_sel_i,
output DATA_T oup_data_o,
output logic oup_valid_o,
input logic oup_ready_i
);
always_comb begin
inp_ready_o = '0;
inp_ready_o[inp_sel_i] = oup_ready_i;
end
assign oup_data_o = inp_data_i[inp_sel_i];
assign oup_valid_o = inp_valid_i[inp_sel_i];
// pragma translate_off
`ifndef VERILATOR
initial begin: p_assertions
assert (N_INP >= 1) else $fatal (1, "The number of inputs must be at least 1!");
end
`endif
// pragma translate_on
endmodule