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Diffstat (limited to 'fpga/usrp2/udp/prot_eng_rx.v')
| -rw-r--r-- | fpga/usrp2/udp/prot_eng_rx.v | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/fpga/usrp2/udp/prot_eng_rx.v b/fpga/usrp2/udp/prot_eng_rx.v deleted file mode 100644 index ccb59b7ff..000000000 --- a/fpga/usrp2/udp/prot_eng_rx.v +++ /dev/null @@ -1,138 +0,0 @@ -// -// Copyright 2011 Ettus Research LLC -// -// This program is free software: you can redistribute it and/or modify -// it under the terms of the GNU General Public License as published by -// the Free Software Foundation, either version 3 of the License, or -// (at your option) any later version. -// -// This program is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License for more details. -// -// You should have received a copy of the GNU General Public License -// along with this program. If not, see <http://www.gnu.org/licenses/>. -// - - - - -// Protocol Engine Receiver -// Checks each line (16 bits) against values in setting regs -// 3 options for each line -- -// Error if mismatch, Slowpath if mismatch, or ignore line -// The engine increases the length of each packet by 32 or 48 bits, -// bringing the total length to a multiple of 32 bits. The last line -// is entirely new, and contains the results of the matching operation: -// 16 bits of flags, 16 bits of data. Flags indicate error or slowpath -// Data indicates line that caused mismatch if any. - - -// Flags[2:0] is {occ, eop, sop} -// Protocol word format is: -// 22 Last Header Line -// 21 SLOWPATH if mismatch -// 20 ERROR if mismatch -// 19 This is the IP checksum -// 18 This is the UDP checksum -// 17 Compute IP checksum on this word -// 16 Compute UDP checksum on this word -// 15:0 data word to be matched - -module prot_eng_rx - #(parameter BASE=0) - (input clk, input reset, input clear, - input set_stb, input [7:0] set_addr, input [31:0] set_data, - input [18:0] datain, input src_rdy_i, output dst_rdy_o, - output [18:0] dataout, output src_rdy_o, input dst_rdy_i); - - localparam HDR_WIDTH = 16 + 7; // 16 bits plus flags - localparam HDR_LEN = 32; // Up to 64 bytes of protocol - - // Store header values in a small dual-port (distributed) ram - reg [HDR_WIDTH-1:0] header_ram[0:HDR_LEN-1]; - wire [HDR_WIDTH-1:0] header_word; - - always @(posedge clk) - if(set_stb & ((set_addr & 8'hE0) == BASE)) - header_ram[set_addr[4:0]] <= set_data; - - assign header_word = header_ram[state]; - - wire consume_input = src_rdy_i & dst_rdy_o; - wire produce_output = src_rdy_o & dst_rdy_i; - - // Main State Machine - reg [15:0] pkt_length, fail_word, dataout_int; - - reg slowpath, error, sof_o, eof_o, occ_o, odd; - - assign dataout = {occ_o, eof_o, sof_o, dataout_int}; - - wire [15:0] calc_ip_checksum, calc_udp_checksum; - reg [15:0] rx_ip_checksum, rx_udp_checksum; - - always @(posedge clk) - if(header_word[19]) - rx_ip_checksum <= datain[15:0]; - always @(posedge clk) - if(header_word[18]) - rx_udp_checksum <= datain[15:0]; - - always @(posedge clk) - if(reset | clear) - begin - slowpath <= 0; - error <= 0; - state <= 0; - fail_word <= 0; - eof_o <= 0; - occ_o <= 0; - end - else if(src_rdy_i & dst_rdy_i) - case (state) - 0 : - begin - slowpath <= 0; - error <= 0; - eof_o <= 0; - occ_o <= 0; - state <= 1; - end - - ST_SLOWPATH : - ; - ST_ERROR : - ; - ST_PAYLOAD : - ; - ST_FILLER : - ; - ST_END1 : - ; - ST_END2 : - ; - default : - if(header_word[21] && mismatch) - state <= ST_SLOWPATH; - else if(header_word[20] && mismatch) - state <= ST_ERROR; - else if(header_word[22]) - state <= ST_PAYLOAD; - else - state <= state + 1; - endcase // case (state) - - - - // IP + UDP checksum state machines - checksum_sm ip_chk - (.clk(clk), .reset(reset), .in(datain), - .calc(consume_input & header_word[17]), .clear(state==0), .checksum(ip_checksum)); - - checksum_sm udp_chk - (.clk(clk), .reset(reset), .in(datain), - .calc(consume_input & header_word[16]), .clear(state==0), .checksum(udp_checksum)); - -endmodule // prot_eng_rx |