mirror of
https://github.com/corundum/corundum.git
synced 2025-01-16 08:12:53 +08:00
504 lines
21 KiB
Verilog
504 lines
21 KiB
Verilog
/*
|
|
|
|
Copyright (c) 2014-2017 Alex Forencich
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
THE SOFTWARE.
|
|
|
|
*/
|
|
|
|
// Language: Verilog 2001
|
|
|
|
`timescale 1ns / 1ps
|
|
|
|
/*
|
|
* IP 2 port multiplexer (64 bit datapath)
|
|
*/
|
|
module ip_mux_64_2
|
|
(
|
|
input wire clk,
|
|
input wire rst,
|
|
|
|
/*
|
|
* IP frame inputs
|
|
*/
|
|
input wire input_0_ip_hdr_valid,
|
|
output wire input_0_ip_hdr_ready,
|
|
input wire [47:0] input_0_eth_dest_mac,
|
|
input wire [47:0] input_0_eth_src_mac,
|
|
input wire [15:0] input_0_eth_type,
|
|
input wire [3:0] input_0_ip_version,
|
|
input wire [3:0] input_0_ip_ihl,
|
|
input wire [5:0] input_0_ip_dscp,
|
|
input wire [1:0] input_0_ip_ecn,
|
|
input wire [15:0] input_0_ip_length,
|
|
input wire [15:0] input_0_ip_identification,
|
|
input wire [2:0] input_0_ip_flags,
|
|
input wire [12:0] input_0_ip_fragment_offset,
|
|
input wire [7:0] input_0_ip_ttl,
|
|
input wire [7:0] input_0_ip_protocol,
|
|
input wire [15:0] input_0_ip_header_checksum,
|
|
input wire [31:0] input_0_ip_source_ip,
|
|
input wire [31:0] input_0_ip_dest_ip,
|
|
input wire [63:0] input_0_ip_payload_tdata,
|
|
input wire [7:0] input_0_ip_payload_tkeep,
|
|
input wire input_0_ip_payload_tvalid,
|
|
output wire input_0_ip_payload_tready,
|
|
input wire input_0_ip_payload_tlast,
|
|
input wire input_0_ip_payload_tuser,
|
|
|
|
input wire input_1_ip_hdr_valid,
|
|
output wire input_1_ip_hdr_ready,
|
|
input wire [47:0] input_1_eth_dest_mac,
|
|
input wire [47:0] input_1_eth_src_mac,
|
|
input wire [15:0] input_1_eth_type,
|
|
input wire [3:0] input_1_ip_version,
|
|
input wire [3:0] input_1_ip_ihl,
|
|
input wire [5:0] input_1_ip_dscp,
|
|
input wire [1:0] input_1_ip_ecn,
|
|
input wire [15:0] input_1_ip_length,
|
|
input wire [15:0] input_1_ip_identification,
|
|
input wire [2:0] input_1_ip_flags,
|
|
input wire [12:0] input_1_ip_fragment_offset,
|
|
input wire [7:0] input_1_ip_ttl,
|
|
input wire [7:0] input_1_ip_protocol,
|
|
input wire [15:0] input_1_ip_header_checksum,
|
|
input wire [31:0] input_1_ip_source_ip,
|
|
input wire [31:0] input_1_ip_dest_ip,
|
|
input wire [63:0] input_1_ip_payload_tdata,
|
|
input wire [7:0] input_1_ip_payload_tkeep,
|
|
input wire input_1_ip_payload_tvalid,
|
|
output wire input_1_ip_payload_tready,
|
|
input wire input_1_ip_payload_tlast,
|
|
input wire input_1_ip_payload_tuser,
|
|
|
|
/*
|
|
* IP frame output
|
|
*/
|
|
output wire output_ip_hdr_valid,
|
|
input wire output_ip_hdr_ready,
|
|
output wire [47:0] output_eth_dest_mac,
|
|
output wire [47:0] output_eth_src_mac,
|
|
output wire [15:0] output_eth_type,
|
|
output wire [3:0] output_ip_version,
|
|
output wire [3:0] output_ip_ihl,
|
|
output wire [5:0] output_ip_dscp,
|
|
output wire [1:0] output_ip_ecn,
|
|
output wire [15:0] output_ip_length,
|
|
output wire [15:0] output_ip_identification,
|
|
output wire [2:0] output_ip_flags,
|
|
output wire [12:0] output_ip_fragment_offset,
|
|
output wire [7:0] output_ip_ttl,
|
|
output wire [7:0] output_ip_protocol,
|
|
output wire [15:0] output_ip_header_checksum,
|
|
output wire [31:0] output_ip_source_ip,
|
|
output wire [31:0] output_ip_dest_ip,
|
|
output wire [63:0] output_ip_payload_tdata,
|
|
output wire [7:0] output_ip_payload_tkeep,
|
|
output wire output_ip_payload_tvalid,
|
|
input wire output_ip_payload_tready,
|
|
output wire output_ip_payload_tlast,
|
|
output wire output_ip_payload_tuser,
|
|
|
|
/*
|
|
* Control
|
|
*/
|
|
input wire enable,
|
|
input wire [0:0] select
|
|
);
|
|
|
|
reg [0:0] select_reg = 1'd0, select_next;
|
|
reg frame_reg = 1'b0, frame_next;
|
|
|
|
reg input_0_ip_hdr_ready_reg = 1'b0, input_0_ip_hdr_ready_next;
|
|
reg input_1_ip_hdr_ready_reg = 1'b0, input_1_ip_hdr_ready_next;
|
|
|
|
reg input_0_ip_payload_tready_reg = 1'b0, input_0_ip_payload_tready_next;
|
|
reg input_1_ip_payload_tready_reg = 1'b0, input_1_ip_payload_tready_next;
|
|
|
|
reg output_ip_hdr_valid_reg = 1'b0, output_ip_hdr_valid_next;
|
|
reg [47:0] output_eth_dest_mac_reg = 48'd0, output_eth_dest_mac_next;
|
|
reg [47:0] output_eth_src_mac_reg = 48'd0, output_eth_src_mac_next;
|
|
reg [15:0] output_eth_type_reg = 16'd0, output_eth_type_next;
|
|
reg [3:0] output_ip_version_reg = 4'd0, output_ip_version_next;
|
|
reg [3:0] output_ip_ihl_reg = 4'd0, output_ip_ihl_next;
|
|
reg [5:0] output_ip_dscp_reg = 6'd0, output_ip_dscp_next;
|
|
reg [1:0] output_ip_ecn_reg = 2'd0, output_ip_ecn_next;
|
|
reg [15:0] output_ip_length_reg = 16'd0, output_ip_length_next;
|
|
reg [15:0] output_ip_identification_reg = 16'd0, output_ip_identification_next;
|
|
reg [2:0] output_ip_flags_reg = 3'd0, output_ip_flags_next;
|
|
reg [12:0] output_ip_fragment_offset_reg = 13'd0, output_ip_fragment_offset_next;
|
|
reg [7:0] output_ip_ttl_reg = 8'd0, output_ip_ttl_next;
|
|
reg [7:0] output_ip_protocol_reg = 8'd0, output_ip_protocol_next;
|
|
reg [15:0] output_ip_header_checksum_reg = 16'd0, output_ip_header_checksum_next;
|
|
reg [31:0] output_ip_source_ip_reg = 32'd0, output_ip_source_ip_next;
|
|
reg [31:0] output_ip_dest_ip_reg = 32'd0, output_ip_dest_ip_next;
|
|
|
|
// internal datapath
|
|
reg [63:0] output_ip_payload_tdata_int;
|
|
reg [7:0] output_ip_payload_tkeep_int;
|
|
reg output_ip_payload_tvalid_int;
|
|
reg output_ip_payload_tready_int_reg = 1'b0;
|
|
reg output_ip_payload_tlast_int;
|
|
reg output_ip_payload_tuser_int;
|
|
wire output_ip_payload_tready_int_early;
|
|
|
|
assign input_0_ip_hdr_ready = input_0_ip_hdr_ready_reg;
|
|
assign input_1_ip_hdr_ready = input_1_ip_hdr_ready_reg;
|
|
|
|
assign input_0_ip_payload_tready = input_0_ip_payload_tready_reg;
|
|
assign input_1_ip_payload_tready = input_1_ip_payload_tready_reg;
|
|
|
|
assign output_ip_hdr_valid = output_ip_hdr_valid_reg;
|
|
assign output_eth_dest_mac = output_eth_dest_mac_reg;
|
|
assign output_eth_src_mac = output_eth_src_mac_reg;
|
|
assign output_eth_type = output_eth_type_reg;
|
|
assign output_ip_version = output_ip_version_reg;
|
|
assign output_ip_ihl = output_ip_ihl_reg;
|
|
assign output_ip_dscp = output_ip_dscp_reg;
|
|
assign output_ip_ecn = output_ip_ecn_reg;
|
|
assign output_ip_length = output_ip_length_reg;
|
|
assign output_ip_identification = output_ip_identification_reg;
|
|
assign output_ip_flags = output_ip_flags_reg;
|
|
assign output_ip_fragment_offset = output_ip_fragment_offset_reg;
|
|
assign output_ip_ttl = output_ip_ttl_reg;
|
|
assign output_ip_protocol = output_ip_protocol_reg;
|
|
assign output_ip_header_checksum = output_ip_header_checksum_reg;
|
|
assign output_ip_source_ip = output_ip_source_ip_reg;
|
|
assign output_ip_dest_ip = output_ip_dest_ip_reg;
|
|
|
|
// mux for start of packet detection
|
|
reg selected_input_ip_hdr_valid;
|
|
reg [47:0] selected_input_eth_dest_mac;
|
|
reg [47:0] selected_input_eth_src_mac;
|
|
reg [15:0] selected_input_eth_type;
|
|
reg [3:0] selected_input_ip_version;
|
|
reg [3:0] selected_input_ip_ihl;
|
|
reg [5:0] selected_input_ip_dscp;
|
|
reg [1:0] selected_input_ip_ecn;
|
|
reg [15:0] selected_input_ip_length;
|
|
reg [15:0] selected_input_ip_identification;
|
|
reg [2:0] selected_input_ip_flags;
|
|
reg [12:0] selected_input_ip_fragment_offset;
|
|
reg [7:0] selected_input_ip_ttl;
|
|
reg [7:0] selected_input_ip_protocol;
|
|
reg [15:0] selected_input_ip_header_checksum;
|
|
reg [31:0] selected_input_ip_source_ip;
|
|
reg [31:0] selected_input_ip_dest_ip;
|
|
always @* begin
|
|
case (select)
|
|
1'd0: begin
|
|
selected_input_ip_hdr_valid = input_0_ip_hdr_valid;
|
|
selected_input_eth_dest_mac = input_0_eth_dest_mac;
|
|
selected_input_eth_src_mac = input_0_eth_src_mac;
|
|
selected_input_eth_type = input_0_eth_type;
|
|
selected_input_ip_version = input_0_ip_version;
|
|
selected_input_ip_ihl = input_0_ip_ihl;
|
|
selected_input_ip_dscp = input_0_ip_dscp;
|
|
selected_input_ip_ecn = input_0_ip_ecn;
|
|
selected_input_ip_length = input_0_ip_length;
|
|
selected_input_ip_identification = input_0_ip_identification;
|
|
selected_input_ip_flags = input_0_ip_flags;
|
|
selected_input_ip_fragment_offset = input_0_ip_fragment_offset;
|
|
selected_input_ip_ttl = input_0_ip_ttl;
|
|
selected_input_ip_protocol = input_0_ip_protocol;
|
|
selected_input_ip_header_checksum = input_0_ip_header_checksum;
|
|
selected_input_ip_source_ip = input_0_ip_source_ip;
|
|
selected_input_ip_dest_ip = input_0_ip_dest_ip;
|
|
end
|
|
1'd1: begin
|
|
selected_input_ip_hdr_valid = input_1_ip_hdr_valid;
|
|
selected_input_eth_dest_mac = input_1_eth_dest_mac;
|
|
selected_input_eth_src_mac = input_1_eth_src_mac;
|
|
selected_input_eth_type = input_1_eth_type;
|
|
selected_input_ip_version = input_1_ip_version;
|
|
selected_input_ip_ihl = input_1_ip_ihl;
|
|
selected_input_ip_dscp = input_1_ip_dscp;
|
|
selected_input_ip_ecn = input_1_ip_ecn;
|
|
selected_input_ip_length = input_1_ip_length;
|
|
selected_input_ip_identification = input_1_ip_identification;
|
|
selected_input_ip_flags = input_1_ip_flags;
|
|
selected_input_ip_fragment_offset = input_1_ip_fragment_offset;
|
|
selected_input_ip_ttl = input_1_ip_ttl;
|
|
selected_input_ip_protocol = input_1_ip_protocol;
|
|
selected_input_ip_header_checksum = input_1_ip_header_checksum;
|
|
selected_input_ip_source_ip = input_1_ip_source_ip;
|
|
selected_input_ip_dest_ip = input_1_ip_dest_ip;
|
|
end
|
|
default: begin
|
|
selected_input_ip_hdr_valid = 1'b0;
|
|
selected_input_eth_dest_mac = 48'd0;
|
|
selected_input_eth_src_mac = 48'd0;
|
|
selected_input_eth_type = 16'd0;
|
|
selected_input_ip_version = 4'd0;
|
|
selected_input_ip_ihl = 4'd0;
|
|
selected_input_ip_dscp = 6'd0;
|
|
selected_input_ip_ecn = 2'd0;
|
|
selected_input_ip_length = 16'd0;
|
|
selected_input_ip_identification = 16'd0;
|
|
selected_input_ip_flags = 3'd0;
|
|
selected_input_ip_fragment_offset = 13'd0;
|
|
selected_input_ip_ttl = 8'd0;
|
|
selected_input_ip_protocol = 8'd0;
|
|
selected_input_ip_header_checksum = 16'd0;
|
|
selected_input_ip_source_ip = 32'd0;
|
|
selected_input_ip_dest_ip = 32'd0;
|
|
end
|
|
endcase
|
|
end
|
|
|
|
// mux for incoming packet
|
|
reg [63:0] current_input_tdata;
|
|
reg [7:0] current_input_tkeep;
|
|
reg current_input_tvalid;
|
|
reg current_input_tready;
|
|
reg current_input_tlast;
|
|
reg current_input_tuser;
|
|
always @* begin
|
|
case (select_reg)
|
|
1'd0: begin
|
|
current_input_tdata = input_0_ip_payload_tdata;
|
|
current_input_tkeep = input_0_ip_payload_tkeep;
|
|
current_input_tvalid = input_0_ip_payload_tvalid;
|
|
current_input_tready = input_0_ip_payload_tready;
|
|
current_input_tlast = input_0_ip_payload_tlast;
|
|
current_input_tuser = input_0_ip_payload_tuser;
|
|
end
|
|
1'd1: begin
|
|
current_input_tdata = input_1_ip_payload_tdata;
|
|
current_input_tkeep = input_1_ip_payload_tkeep;
|
|
current_input_tvalid = input_1_ip_payload_tvalid;
|
|
current_input_tready = input_1_ip_payload_tready;
|
|
current_input_tlast = input_1_ip_payload_tlast;
|
|
current_input_tuser = input_1_ip_payload_tuser;
|
|
end
|
|
default: begin
|
|
current_input_tdata = 64'd0;
|
|
current_input_tkeep = 8'd0;
|
|
current_input_tvalid = 1'b0;
|
|
current_input_tready = 1'b0;
|
|
current_input_tlast = 1'b0;
|
|
current_input_tuser = 1'b0;
|
|
end
|
|
endcase
|
|
end
|
|
|
|
always @* begin
|
|
select_next = select_reg;
|
|
frame_next = frame_reg;
|
|
|
|
input_0_ip_hdr_ready_next = input_0_ip_hdr_ready_reg & ~input_0_ip_hdr_valid;
|
|
input_1_ip_hdr_ready_next = input_1_ip_hdr_ready_reg & ~input_1_ip_hdr_valid;
|
|
|
|
input_0_ip_payload_tready_next = 1'b0;
|
|
input_1_ip_payload_tready_next = 1'b0;
|
|
|
|
output_ip_hdr_valid_next = output_ip_hdr_valid_reg & ~output_ip_hdr_ready;
|
|
output_eth_dest_mac_next = output_eth_dest_mac_reg;
|
|
output_eth_src_mac_next = output_eth_src_mac_reg;
|
|
output_eth_type_next = output_eth_type_reg;
|
|
output_ip_version_next = output_ip_version_reg;
|
|
output_ip_ihl_next = output_ip_ihl_reg;
|
|
output_ip_dscp_next = output_ip_dscp_reg;
|
|
output_ip_ecn_next = output_ip_ecn_reg;
|
|
output_ip_length_next = output_ip_length_reg;
|
|
output_ip_identification_next = output_ip_identification_reg;
|
|
output_ip_flags_next = output_ip_flags_reg;
|
|
output_ip_fragment_offset_next = output_ip_fragment_offset_reg;
|
|
output_ip_ttl_next = output_ip_ttl_reg;
|
|
output_ip_protocol_next = output_ip_protocol_reg;
|
|
output_ip_header_checksum_next = output_ip_header_checksum_reg;
|
|
output_ip_source_ip_next = output_ip_source_ip_reg;
|
|
output_ip_dest_ip_next = output_ip_dest_ip_reg;
|
|
|
|
if (current_input_tvalid & current_input_tready) begin
|
|
// end of frame detection
|
|
if (current_input_tlast) begin
|
|
frame_next = 1'b0;
|
|
end
|
|
end
|
|
|
|
if (~frame_reg & enable & ~output_ip_hdr_valid & selected_input_ip_hdr_valid) begin
|
|
// start of frame, grab select value
|
|
frame_next = 1'b1;
|
|
select_next = select;
|
|
|
|
case (select_next)
|
|
1'd0: input_0_ip_hdr_ready_next = 1'b1;
|
|
1'd1: input_1_ip_hdr_ready_next = 1'b1;
|
|
endcase
|
|
|
|
output_ip_hdr_valid_next = 1'b1;
|
|
output_eth_dest_mac_next = selected_input_eth_dest_mac;
|
|
output_eth_src_mac_next = selected_input_eth_src_mac;
|
|
output_eth_type_next = selected_input_eth_type;
|
|
output_ip_version_next = selected_input_ip_version;
|
|
output_ip_ihl_next = selected_input_ip_ihl;
|
|
output_ip_dscp_next = selected_input_ip_dscp;
|
|
output_ip_ecn_next = selected_input_ip_ecn;
|
|
output_ip_length_next = selected_input_ip_length;
|
|
output_ip_identification_next = selected_input_ip_identification;
|
|
output_ip_flags_next = selected_input_ip_flags;
|
|
output_ip_fragment_offset_next = selected_input_ip_fragment_offset;
|
|
output_ip_ttl_next = selected_input_ip_ttl;
|
|
output_ip_protocol_next = selected_input_ip_protocol;
|
|
output_ip_header_checksum_next = selected_input_ip_header_checksum;
|
|
output_ip_source_ip_next = selected_input_ip_source_ip;
|
|
output_ip_dest_ip_next = selected_input_ip_dest_ip;
|
|
end
|
|
|
|
// generate ready signal on selected port
|
|
case (select_next)
|
|
1'd0: input_0_ip_payload_tready_next = output_ip_payload_tready_int_early & frame_next;
|
|
1'd1: input_1_ip_payload_tready_next = output_ip_payload_tready_int_early & frame_next;
|
|
endcase
|
|
|
|
// pass through selected packet data
|
|
output_ip_payload_tdata_int = current_input_tdata;
|
|
output_ip_payload_tkeep_int = current_input_tkeep;
|
|
output_ip_payload_tvalid_int = current_input_tvalid & current_input_tready & frame_reg;
|
|
output_ip_payload_tlast_int = current_input_tlast;
|
|
output_ip_payload_tuser_int = current_input_tuser;
|
|
end
|
|
|
|
always @(posedge clk) begin
|
|
if (rst) begin
|
|
select_reg <= 1'd0;
|
|
frame_reg <= 1'b0;
|
|
input_0_ip_hdr_ready_reg <= 1'b0;
|
|
input_1_ip_hdr_ready_reg <= 1'b0;
|
|
input_0_ip_payload_tready_reg <= 1'b0;
|
|
input_1_ip_payload_tready_reg <= 1'b0;
|
|
output_ip_hdr_valid_reg <= 1'b0;
|
|
end else begin
|
|
select_reg <= select_next;
|
|
frame_reg <= frame_next;
|
|
input_0_ip_hdr_ready_reg <= input_0_ip_hdr_ready_next;
|
|
input_1_ip_hdr_ready_reg <= input_1_ip_hdr_ready_next;
|
|
input_0_ip_payload_tready_reg <= input_0_ip_payload_tready_next;
|
|
input_1_ip_payload_tready_reg <= input_1_ip_payload_tready_next;
|
|
output_ip_hdr_valid_reg <= output_ip_hdr_valid_next;
|
|
end
|
|
|
|
output_eth_dest_mac_reg <= output_eth_dest_mac_next;
|
|
output_eth_src_mac_reg <= output_eth_src_mac_next;
|
|
output_eth_type_reg <= output_eth_type_next;
|
|
output_ip_version_reg <= output_ip_version_next;
|
|
output_ip_ihl_reg <= output_ip_ihl_next;
|
|
output_ip_dscp_reg <= output_ip_dscp_next;
|
|
output_ip_ecn_reg <= output_ip_ecn_next;
|
|
output_ip_length_reg <= output_ip_length_next;
|
|
output_ip_identification_reg <= output_ip_identification_next;
|
|
output_ip_flags_reg <= output_ip_flags_next;
|
|
output_ip_fragment_offset_reg <= output_ip_fragment_offset_next;
|
|
output_ip_ttl_reg <= output_ip_ttl_next;
|
|
output_ip_protocol_reg <= output_ip_protocol_next;
|
|
output_ip_header_checksum_reg <= output_ip_header_checksum_next;
|
|
output_ip_source_ip_reg <= output_ip_source_ip_next;
|
|
output_ip_dest_ip_reg <= output_ip_dest_ip_next;
|
|
end
|
|
|
|
// output datapath logic
|
|
reg [63:0] output_ip_payload_tdata_reg = 64'd0;
|
|
reg [7:0] output_ip_payload_tkeep_reg = 8'd0;
|
|
reg output_ip_payload_tvalid_reg = 1'b0, output_ip_payload_tvalid_next;
|
|
reg output_ip_payload_tlast_reg = 1'b0;
|
|
reg output_ip_payload_tuser_reg = 1'b0;
|
|
|
|
reg [63:0] temp_ip_payload_tdata_reg = 64'd0;
|
|
reg [7:0] temp_ip_payload_tkeep_reg = 8'd0;
|
|
reg temp_ip_payload_tvalid_reg = 1'b0, temp_ip_payload_tvalid_next;
|
|
reg temp_ip_payload_tlast_reg = 1'b0;
|
|
reg temp_ip_payload_tuser_reg = 1'b0;
|
|
|
|
// datapath control
|
|
reg store_ip_payload_int_to_output;
|
|
reg store_ip_payload_int_to_temp;
|
|
reg store_ip_payload_temp_to_output;
|
|
|
|
assign output_ip_payload_tdata = output_ip_payload_tdata_reg;
|
|
assign output_ip_payload_tkeep = output_ip_payload_tkeep_reg;
|
|
assign output_ip_payload_tvalid = output_ip_payload_tvalid_reg;
|
|
assign output_ip_payload_tlast = output_ip_payload_tlast_reg;
|
|
assign output_ip_payload_tuser = output_ip_payload_tuser_reg;
|
|
|
|
// enable ready input next cycle if output is ready or the temp reg will not be filled on the next cycle (output reg empty or no input)
|
|
assign output_ip_payload_tready_int_early = output_ip_payload_tready | (~temp_ip_payload_tvalid_reg & (~output_ip_payload_tvalid_reg | ~output_ip_payload_tvalid_int));
|
|
|
|
always @* begin
|
|
// transfer sink ready state to source
|
|
output_ip_payload_tvalid_next = output_ip_payload_tvalid_reg;
|
|
temp_ip_payload_tvalid_next = temp_ip_payload_tvalid_reg;
|
|
|
|
store_ip_payload_int_to_output = 1'b0;
|
|
store_ip_payload_int_to_temp = 1'b0;
|
|
store_ip_payload_temp_to_output = 1'b0;
|
|
|
|
if (output_ip_payload_tready_int_reg) begin
|
|
// input is ready
|
|
if (output_ip_payload_tready | ~output_ip_payload_tvalid_reg) begin
|
|
// output is ready or currently not valid, transfer data to output
|
|
output_ip_payload_tvalid_next = output_ip_payload_tvalid_int;
|
|
store_ip_payload_int_to_output = 1'b1;
|
|
end else begin
|
|
// output is not ready, store input in temp
|
|
temp_ip_payload_tvalid_next = output_ip_payload_tvalid_int;
|
|
store_ip_payload_int_to_temp = 1'b1;
|
|
end
|
|
end else if (output_ip_payload_tready) begin
|
|
// input is not ready, but output is ready
|
|
output_ip_payload_tvalid_next = temp_ip_payload_tvalid_reg;
|
|
temp_ip_payload_tvalid_next = 1'b0;
|
|
store_ip_payload_temp_to_output = 1'b1;
|
|
end
|
|
end
|
|
|
|
always @(posedge clk) begin
|
|
if (rst) begin
|
|
output_ip_payload_tvalid_reg <= 1'b0;
|
|
output_ip_payload_tready_int_reg <= 1'b0;
|
|
temp_ip_payload_tvalid_reg <= 1'b0;
|
|
end else begin
|
|
output_ip_payload_tvalid_reg <= output_ip_payload_tvalid_next;
|
|
output_ip_payload_tready_int_reg <= output_ip_payload_tready_int_early;
|
|
temp_ip_payload_tvalid_reg <= temp_ip_payload_tvalid_next;
|
|
end
|
|
|
|
// datapath
|
|
if (store_ip_payload_int_to_output) begin
|
|
output_ip_payload_tdata_reg <= output_ip_payload_tdata_int;
|
|
output_ip_payload_tkeep_reg <= output_ip_payload_tkeep_int;
|
|
output_ip_payload_tlast_reg <= output_ip_payload_tlast_int;
|
|
output_ip_payload_tuser_reg <= output_ip_payload_tuser_int;
|
|
end else if (store_ip_payload_temp_to_output) begin
|
|
output_ip_payload_tdata_reg <= temp_ip_payload_tdata_reg;
|
|
output_ip_payload_tkeep_reg <= temp_ip_payload_tkeep_reg;
|
|
output_ip_payload_tlast_reg <= temp_ip_payload_tlast_reg;
|
|
output_ip_payload_tuser_reg <= temp_ip_payload_tuser_reg;
|
|
end
|
|
|
|
if (store_ip_payload_int_to_temp) begin
|
|
temp_ip_payload_tdata_reg <= output_ip_payload_tdata_int;
|
|
temp_ip_payload_tkeep_reg <= output_ip_payload_tkeep_int;
|
|
temp_ip_payload_tlast_reg <= output_ip_payload_tlast_int;
|
|
temp_ip_payload_tuser_reg <= output_ip_payload_tuser_int;
|
|
end
|
|
end
|
|
|
|
endmodule
|