OpenCores
URL https://opencores.org/ocsvn/srdydrdy_lib/srdydrdy_lib/trunk

Subversion Repositories srdydrdy_lib

[/] [srdydrdy_lib/] [trunk/] [examples/] [bridge/] [rtl/] [pkt_parse.v] - Blame information for rev 18

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 8 ghutchis 
// packet parser
2 
//
3 
// Takes input packet on rxg interface and copies packet to pdo
4 
// interface, without changing packet data.  If packet is too
5 
// short to be parsed, converts packet to an error code.
6 
//
7 
// If packet parses correctly and is not an error packet, sends
8 
// a parse result to the FIB for lookup.  Otherwise aborts the
9 
// packet so it is flushed from the packet FIFO.
10 
module pkt_parse
11 11 ghutchis 
  #(parameter port_num=0)
12 8 ghutchis 
  (input          clk,
13 
   input          reset,
14 
 
15 
   input          rxg_srdy,
16 
   output         rxg_drdy,
17 
   input  [1:0]   rxg_code,
18 
   input [7:0]    rxg_data,
19 
 
20 
   output reg     p2f_srdy,
21 
   input          p2f_drdy,
22 
   output reg [`PAR_DATA_SZ-1:0] p2f_data,
23 
 
24 
   output         pdo_srdy,
25 
   input          pdo_drdy,
26 
   output [1:0]   pdo_code,
27 
   output [7:0]   pdo_data
28 
   );
29 
 
30 
  wire            lp_srdy;
31 
  reg             lp_drdy;
32 
  wire [1:0]       lp_code;
33 
  wire [7:0]       lp_data;
34 
  reg             lc_srdy;
35 
  wire            lc_drdy;
36 
  reg [1:0]        lc_code;
37 
 
38 
  reg [3:0]        count, nxt_count;
39 
  reg             nxt_p2f_srdy;
40 
  reg [`PAR_DATA_SZ-1:0] nxt_p2f_data;
41 
 
42 
  sd_input #(8+2) rxg_in
43 
    (
44 
     // Outputs
45 
     .c_drdy                            (rxg_drdy),
46 
     .ip_srdy                           (lp_srdy),
47 
     .ip_data                           ({lp_code,lp_data}),
48 
     // Inputs
49 
     .clk                               (clk),
50 
     .reset                             (reset),
51 
     .c_srdy                            (rxg_srdy),
52 
     .c_data                            ({rxg_code,rxg_data}),
53 
     .ip_drdy                           (lp_drdy));
54 
 
55 
  always @*
56 
    begin
57 
      nxt_p2f_srdy = p2f_srdy;
58 
      nxt_p2f_data = p2f_data;
59 
      nxt_count = count;
60 
      lc_code = lp_code;
61 
 
62 
      if (p2f_srdy)
63 
        begin
64 
          lp_drdy = 0;
65 
          lc_srdy = 0;
66 
          if (p2f_drdy)
67 
            nxt_p2f_srdy = 0;
68 
        end
69 
      else if (lp_srdy & lc_drdy)
70 
        begin
71 
          lp_drdy = 1;
72 
          lc_srdy = 1;
73 
 
74 
          case (count)
75 
            0, 1, 2, 3, 4, 5 :
76 
              begin
77 
                if (count == 0)
78 11 ghutchis 
                  begin
79 
                    nxt_p2f_data = 0;
80 
                    nxt_p2f_data[`PAR_SRCPORT] = port_num;
81 
                  end
82 8 ghutchis 
 
83 
                if ((lp_code == `PCC_EOP) || (lp_code == `PCC_BADEOP))
84 
                  begin
85 
                    lc_code = `PCC_BADEOP;
86 
                    nxt_count = 0;
87 
                  end
88 
                else
89 
                  begin
90 
                    nxt_p2f_data[`PAR_MACDA] = { p2f_data[`PAR_MACDA] << 8, lp_data };
91 
                    nxt_count = count + 1;
92 
                  end
93 
              end // case: 0, 1, 2, 3, 4, 5
94 
 
95 
            6, 7, 8, 9, 10, 11 :
96 
              begin
97 
                if ((lp_code == `PCC_EOP) || (lp_code == `PCC_BADEOP))
98 
                  begin
99 
                    lc_code = `PCC_BADEOP;
100 
                    nxt_count = 0;
101 
                  end
102 
                else
103 
                  begin
104 
                    nxt_p2f_data[`PAR_MACSA] = { p2f_data[`PAR_MACSA] << 8, lp_data };
105 
                    nxt_count = count + 1;
106 
                  end
107 
              end // case: 6, 7, 8, 9, 10, 11
108 
 
109 
            // done with parsing, wait for packet EOP
110 
            12 :
111 
              begin
112 
                if (lp_code == `PCC_EOP)
113 
                  begin
114 
                    nxt_p2f_srdy = 1;
115 
                    nxt_count = 0;
116 
                  end
117 
                else if (lp_code == `PCC_BADEOP)
118 
                  nxt_count = 0;
119 
              end
120 
 
121 
            default : nxt_count = 0;
122 
          endcase // case (count)
123 
        end
124 
      else
125 
        begin
126 
          lp_drdy = 0;
127 
          lc_srdy = 0;
128 
        end // else: !if(lp_srdy & lc_drdy)
129 
    end // always @ *
130 
 
131 
  always @(posedge clk)
132 
    begin
133 
      if (reset)
134 
        begin
135 
          /*AUTORESET*/
136 
          // Beginning of autoreset for uninitialized flops
137 
          count <= 4'h0;
138 
          p2f_data <= {(1+(`PAR_DATA_SZ-1)){1'b0}};
139 
          p2f_srdy <= 1'h0;
140 
          // End of automatics
141 
        end
142 
      else
143 
        begin
144 
          p2f_srdy <= #1 nxt_p2f_srdy;
145 
          p2f_data <= #1 nxt_p2f_data;
146 
          count <= #1 nxt_count;
147 
        end
148 
    end
149 
 
150 
  sd_output #(8+2) par_out
151 
    (
152 
     // Outputs
153 
     .ic_drdy                           (lc_drdy),
154 
     .p_srdy                            (pdo_srdy),
155 
     .p_data                            ({pdo_code,pdo_data}),
156 
     // Inputs
157 
     .clk                               (clk),
158 
     .reset                             (reset),
159 
     .ic_srdy                           (lc_srdy),
160 
     .ic_data                           ({lp_code,lp_data}),
161 
     .p_drdy                            (pdo_drdy));
162 
 
163 
endmodule // pkt_parse
164 
// Local Variables:
165 
// verilog-library-directories:("." "../../../rtl/verilog/closure" "../../../rtl/verilog/memory" "../../../rtl/verilog/forks")
166 
// End:
167 
 
168 
 

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.