diff options
Diffstat (limited to 'fpga/usrp3/lib/rfnoc/chdr_framer.v')
| -rw-r--r-- | fpga/usrp3/lib/rfnoc/chdr_framer.v | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/fpga/usrp3/lib/rfnoc/chdr_framer.v b/fpga/usrp3/lib/rfnoc/chdr_framer.v deleted file mode 100644 index 271c8e3d5..000000000 --- a/fpga/usrp3/lib/rfnoc/chdr_framer.v +++ /dev/null @@ -1,128 +0,0 @@ -// -// Copyright 2014 Ettus Research LLC -// Copyright 2018 Ettus Research, a National Instruments Company -// -// SPDX-License-Identifier: LGPL-3.0-or-later -// -// FIXME handle odd length inputs -// -// Warning: Currently only 32 / 64-bit input widths are supported. -// If 64-bit is selected, there will be a bubble state. -// - -module chdr_framer - #(parameter SIZE=10, - parameter WIDTH=32, // 32 or 64 only! TODO: Extend to other widths. - parameter USE_SEQ_NUM=0) // Use provided seq number in tuser - (input clk, input reset, input clear, - input [WIDTH-1:0] i_tdata, input [127:0] i_tuser, input i_tlast, input i_tvalid, output i_tready, - output [63:0] o_tdata, output o_tlast, output o_tvalid, input o_tready); - - wire header_i_tvalid, header_i_tready; - wire [63:0] body_i_tdata; - wire body_i_tlast, body_i_tvalid, body_i_tready; - - wire [127:0] header_o_tdata; - wire header_o_tvalid, header_o_tready; - wire [63:0] body_o_tdata; - wire body_o_tlast, body_o_tvalid, body_o_tready; - reg [15:0] length; - reg [11:0] seqnum; - - assign i_tready = header_i_tready & body_i_tready; - assign header_i_tvalid = i_tlast & i_tvalid & i_tready; - assign body_i_tlast = i_tlast; - - // Handle 32 and 64 widths - generate - if (WIDTH == 32) begin - reg even; - always @(posedge clk) - if(reset | clear) - even <= 0; - else - if(i_tvalid & i_tready) - if(i_tlast) - even <= 0; - else - even <= ~even; - - reg [31:0] held_i_tdata; - always @(posedge clk) begin - if (i_tvalid & i_tready) held_i_tdata <= i_tdata; - end - assign body_i_tvalid = i_tvalid & i_tready & (i_tlast | even); - assign body_i_tdata = even ? { held_i_tdata, i_tdata } : {i_tdata, i_tdata}; // really should be 0 in bottom, but this simplifies mux - end else begin - assign body_i_tvalid = i_tvalid; - assign body_i_tdata = i_tdata; - end - endgenerate - - // FIXME handle lengths of partial 32-bit words - always @(posedge clk) - if(reset | clear) - length <= (WIDTH == 32) ? 4 : 8; - else if(header_i_tready & header_i_tvalid) - length <= (WIDTH == 32) ? 4 : 8; - else if(i_tvalid & i_tready) - length <= (WIDTH == 32) ? length + 4 : length + 8; - - axi_fifo_flop2 #(.WIDTH(128)) header_fifo_flop2 - (.clk(clk), .reset(reset), .clear(clear), - .i_tdata({i_tuser[127:112],length,i_tuser[95:0]}), .i_tvalid(header_i_tvalid), .i_tready(header_i_tready), - .o_tdata(header_o_tdata), .o_tvalid(header_o_tvalid), .o_tready(header_o_tready), - .occupied(), .space()); - - axi_fifo #(.WIDTH(65), .SIZE(SIZE)) body_fifo - (.clk(clk), .reset(reset), .clear(clear), - .i_tdata({body_i_tlast,body_i_tdata}), .i_tvalid(body_i_tvalid), .i_tready(body_i_tready), - .o_tdata({body_o_tlast,body_o_tdata}), .o_tvalid(body_o_tvalid), .o_tready(body_o_tready), - .occupied(), .space()); - - reg [3:0] chdr_state; - localparam ST_IDLE = 0; - localparam ST_HEAD = 1; - localparam ST_TIME = 2; - localparam ST_BODY = 3; - - always @(posedge clk) - if(reset | clear) - chdr_state <= ST_IDLE; - else - case(chdr_state) - ST_IDLE : - if(header_o_tvalid & body_o_tvalid) - chdr_state <= ST_HEAD; - ST_HEAD : - if(o_tready) - if(header_o_tdata[125]) // time - chdr_state <= ST_TIME; - else - chdr_state <= ST_BODY; - ST_TIME : - if(o_tready) - chdr_state <= ST_BODY; - ST_BODY : - if(o_tready & body_o_tlast) - chdr_state <= ST_IDLE; - endcase // case (chdr_state) - - always @(posedge clk) - if(reset | clear) - seqnum <= 12'd0; - else - if(o_tvalid & o_tready & o_tlast) - seqnum <= seqnum + 12'd1; - - wire [15:0] out_length = header_o_tdata[111:96] + (header_o_tdata[125] ? 16'd16 : 16'd8); - - assign o_tvalid = (chdr_state == ST_HEAD) | (chdr_state == ST_TIME) | (body_o_tvalid & (chdr_state == ST_BODY)); - assign o_tlast = (chdr_state == ST_BODY) & body_o_tlast; - assign o_tdata = (chdr_state == ST_HEAD) ? {header_o_tdata[127:124], (USE_SEQ_NUM ? header_o_tdata[123:112] : seqnum), out_length, header_o_tdata[95:64] } : - (chdr_state == ST_TIME) ? header_o_tdata[63:0] : - body_o_tdata; - assign body_o_tready = (chdr_state == ST_BODY) & o_tready; - assign header_o_tready = ((chdr_state == ST_TIME) | ((chdr_state == ST_HEAD) & ~header_o_tdata[125])) & o_tready; - -endmodule // chdr_framer |