diff options
Diffstat (limited to 'usrp2/udp/prot_eng_tx.v')
| -rw-r--r-- | usrp2/udp/prot_eng_tx.v | 39 |
1 files changed, 26 insertions, 13 deletions
diff --git a/usrp2/udp/prot_eng_tx.v b/usrp2/udp/prot_eng_tx.v index a18eb73ae..06ae166ba 100644 --- a/usrp2/udp/prot_eng_tx.v +++ b/usrp2/udp/prot_eng_tx.v @@ -7,6 +7,7 @@ // Odd means the last word is half full // Flags[1:0] is {eop, sop} // Protocol word format is: +// 20 UDP Port Here // 19 Last Header Line // 18 IP Header Checksum XOR // 17 IP Length Here @@ -34,13 +35,18 @@ module prot_eng_tx assign dst_rdy_o = dst_rdy_i & (do_payload | (state==0) | (state==1) | (state==30)); assign src_rdy_o = src_rdy_i & ~((state==0) | (state==1) | (state==30)); - localparam HDR_WIDTH = 16 + 4; // 16 bits plus flags + localparam HDR_WIDTH = 16 + 5; // 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; - reg [15:0] chk_precompute; + + reg [1:0] port_sel; + reg [15:0] per_port_data[0:3]; + reg [15:0] udp_port, chk_precompute; + + always @(posedge clk) udp_port <= per_port_data[port_sel]; always @(posedge clk) if(set_stb & ((set_addr & 8'hE0) == BASE)) @@ -49,13 +55,18 @@ module prot_eng_tx if(set_data[18]) chk_precompute <= set_data[15:0]; end - - assign header_word = header_ram[state]; + always @(posedge clk) + if(set_stb & ((set_addr & 8'hFC) == (BASE+24))) + per_port_data[set_addr[1:0]] <= set_data; + + wire do_udp_port = header_word[20]; wire last_hdr_line = header_word[19]; - wire ip_chk = header_word[18]; - wire ip_len = header_word[17]; - wire udp_len = header_word[16]; + wire do_ip_chk = header_word[18]; + wire do_ip_len = header_word[17]; + wire do_udp_len = header_word[16]; + + assign header_word = header_ram[state]; // Protocol State Machine reg [15:0] length; @@ -75,6 +86,7 @@ module prot_eng_tx 0 : begin fast_path <= datain[0]; + port_sel <= datain[2:1]; state <= 1; end 1 : @@ -113,15 +125,16 @@ module prot_eng_tx checksum_reg <= checksum; always @* - if(ip_chk) - //dataout_int <= header_word[15:0] ^ ip_length; + if(do_payload) + dataout_int <= datain[15:0]; + else if(do_ip_chk) dataout_int <= 16'hFFFF ^ checksum_reg; - else if(ip_len) + else if(do_ip_len) dataout_int <= ip_length; - else if(udp_len) + else if(do_udp_len) dataout_int <= udp_length; - else if(do_payload) - dataout_int <= datain[15:0]; + else if(do_udp_port) + dataout_int <= udp_port; else dataout_int <= header_word[15:0]; |