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104 lines
3.3 KiB
Systemverilog
104 lines
3.3 KiB
Systemverilog
// Copyright © 2019-2023
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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`include "VX_platform.vh"
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`TRACING_OFF
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module VX_stream_pack #(
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parameter NUM_REQS = 1,
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parameter DATA_WIDTH = 1,
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parameter TAG_WIDTH = 1,
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parameter TAG_SEL_BITS = 0,
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parameter `STRING ARBITER = "P",
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parameter OUT_BUF = 0
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) (
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input wire clk,
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input wire reset,
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// input
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input wire [NUM_REQS-1:0] valid_in,
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input wire [NUM_REQS-1:0][DATA_WIDTH-1:0] data_in,
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input wire [NUM_REQS-1:0][TAG_WIDTH-1:0] tag_in,
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output wire [NUM_REQS-1:0] ready_in,
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// output
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output wire valid_out,
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output wire [NUM_REQS-1:0] mask_out,
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output wire [NUM_REQS-1:0][DATA_WIDTH-1:0] data_out,
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output wire [TAG_WIDTH-1:0] tag_out,
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input wire ready_out
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);
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if (NUM_REQS > 1) begin : g_pack
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localparam LOG_NUM_REQS = `CLOG2(NUM_REQS);
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wire [LOG_NUM_REQS-1:0] grant_index;
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wire grant_valid;
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wire grant_ready;
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VX_generic_arbiter #(
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.NUM_REQS (NUM_REQS),
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.TYPE (ARBITER)
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) arbiter (
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.clk (clk),
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.reset (reset),
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.requests (valid_in),
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.grant_valid (grant_valid),
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.grant_index (grant_index),
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`UNUSED_PIN (grant_onehot),
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.grant_ready (grant_ready)
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);
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wire [TAG_WIDTH-1:0] tag_sel = tag_in[grant_index];
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wire [NUM_REQS-1:0] tag_matches;
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for (genvar i = 0; i < NUM_REQS; ++i) begin : g_tag_matches
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assign tag_matches[i] = (tag_in[i][TAG_SEL_BITS-1:0] == tag_sel[TAG_SEL_BITS-1:0]);
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end
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for (genvar i = 0; i < NUM_REQS; ++i) begin : g_ready_in
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assign ready_in[i] = grant_ready & tag_matches[i];
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end
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wire [NUM_REQS-1:0] mask_sel = valid_in & tag_matches;
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VX_elastic_buffer #(
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.DATAW (NUM_REQS + TAG_WIDTH + (NUM_REQS * DATA_WIDTH)),
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.SIZE (`TO_OUT_BUF_SIZE(OUT_BUF)),
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.OUT_REG (`TO_OUT_BUF_REG(OUT_BUF))
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) out_buf (
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.clk (clk),
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.reset (reset),
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.valid_in (grant_valid),
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.data_in ({mask_sel, tag_sel, data_in}),
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.ready_in (grant_ready),
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.valid_out (valid_out),
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.data_out ({mask_out, tag_out, data_out}),
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.ready_out (ready_out)
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);
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end else begin : g_passthru
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`UNUSED_VAR (clk)
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`UNUSED_VAR (reset)
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assign valid_out = valid_in;
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assign mask_out = 1'b1;
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assign data_out = data_in;
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assign tag_out = tag_in;
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assign ready_in = ready_out;
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end
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endmodule
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`TRACING_ON
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