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[/] [tv80/] [branches/] [hpa1/] [env/] [env_io.v] - Blame information for rev 86

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module env_io (/*AUTOARG*/
  // Outputs
  DI,
  // Inputs
  clk, iorq_n, rd_n, wr_n, addr, DO
  );
 
  parameter str_buf_sz = 256;
 
  input clk;
  input iorq_n;
  input rd_n;
  input wr_n;
  input [7:0] addr;
  input [7:0] DO;
  inout [7:0] DI;
 
  reg [7:0]    io_data;
 
  reg [7:0]    str_buf [0:str_buf_sz-1];
  reg          io_cs;
  integer      buf_ptr, i;
 
  reg [7:0]    timeout_ctl;
  reg [15:0]   cur_timeout;
  reg [15:0]   max_timeout;
 
  reg [7:0]    int_countdown;
 
  assign       DI = (!iorq_n & !rd_n & io_cs) ? io_data : {8{1'bz}};
 
  initial
    begin
      io_cs = 0;
      buf_ptr = 0;
      cur_timeout = 0;
      max_timeout = 10000;
      timeout_ctl = 1;
      int_countdown = 0;
    end
 
  always @(posedge clk)
    begin
      if (!iorq_n & !wr_n)
        case (addr)
          8'h80 :
            begin
              case (DO)
                1 : tb_top.test_pass;
 
                2 : tb_top.test_fail;
 
                3 : tb_top.dumpon;
 
                4 : tb_top.dumpoff;
 
                default :
                  begin
                    $display ("%t: ERROR   : Unknown I/O command %x", $time, DO);
                  end
              endcase // case(DO)
            end // case: :...
 
          8'h81 :
            begin
              str_buf[buf_ptr] = DO;
              buf_ptr = buf_ptr + 1;
 
              if (buf_ptr == str_buf_sz)
                begin
                  $display ("%t: WARNING : String buffer reached maximum size without detecting EOL", $time);
                  $write ("%t: WARNING : Contents: ", $time);
                  for (i=0; i<buf_ptr; i=i+1)
                    $write ("%s", str_buf[i]);
                  $write ("\n");
                  buf_ptr = 0;
                end
 
              //$display ("%t: DEBUG   : Detected write of character %x", $time, DO);
              if (DO == 8'h0A)
                begin
                  $write ("%t: PROGRAM : ", $time);
 
                  for (i=0; i<buf_ptr; i=i+1)
                    $write ("%s", str_buf[i]);
 
                  buf_ptr = 0;
                end
            end // case: 8'h81
 
          8'h82 :
            begin
              timeout_ctl = DO;
            end
 
          8'h83 : max_timeout[7:0] = DO;
          8'h84 : max_timeout[15:8] = DO;
 
          8'h90 : int_countdown = DO;
        endcase // case(addr)
    end // always @ (posedge clk)
 
  always @(posedge clk)
    begin
      if (timeout_ctl[1])
        cur_timeout = 0;
      else if (timeout_ctl[0])
        cur_timeout = cur_timeout + 1;
 
      if (cur_timeout >= max_timeout)
        begin
          $display ("%t: ERROR   : Reached timeout %d cycles", $time, max_timeout);
          tb_top.test_fail;
        end
    end // always @ (posedge clk)
 
  always @(posedge clk)
    begin
      if (int_countdown == 1)
        begin
          tb_top.int_n  <= #1 1'b0;
          int_countdown = 0;
        end
      else if (int_countdown > 1)
        int_countdown = int_countdown - 1;
    end
 
endmodule // env_io

Line No.	Rev	Author	Line
1	2	ghutchis
2			`module env_io (/AUTOARG/`
3			`// Outputs`
4			`DI,`
5			`// Inputs`
6			`clk, iorq_n, rd_n, wr_n, addr, DO`
7			`);`
8	13	ghutchis
9			`parameter str_buf_sz = 256;`
10	2	ghutchis
11			`input clk;`
12			`input iorq_n;`
13			`input rd_n;`
14			`input wr_n;`
15			`input [7:0] addr;`
16			`input [7:0] DO;`
17			`inout [7:0] DI;`
18
19			`reg [7:0] io_data;`
20
21	13	ghutchis	`reg [7:0] str_buf [0:str_buf_sz-1];`
22	2	ghutchis	`reg io_cs;`
23			`integer buf_ptr, i;`
24
25			`reg [7:0] timeout_ctl;`
26			`reg [15:0] cur_timeout;`
27			`reg [15:0] max_timeout;`
28
29			`reg [7:0] int_countdown;`
30
31			`assign DI = (!iorq_n & !rd_n & io_cs) ? io_data : {8{1'bz}};`
32
33			`initial`
34			`begin`
35			`io_cs = 0;`
36			`buf_ptr = 0;`
37			`cur_timeout = 0;`
38			`max_timeout = 10000;`
39			`timeout_ctl = 1;`
40			`int_countdown = 0;`
41			`end`
42
43			`always @(posedge clk)`
44			`begin`
45			`if (!iorq_n & !wr_n)`
46			`case (addr)`
47			`8'h80 :`
48			`begin`
49			`case (DO)`
50			`1 : tb_top.test_pass;`
51
52			`2 : tb_top.test_fail;`
53
54			`3 : tb_top.dumpon;`
55
56			`4 : tb_top.dumpoff;`
57
58			`default :`
59			`begin`
60			`$display ("%t: ERROR : Unknown I/O command %x", $time, DO);`
61			`end`
62			`endcase // case(DO)`
63			`end // case: :...`
64
65			`8'h81 :`
66			`begin`
67			`str_buf[buf_ptr] = DO;`
68			`buf_ptr = buf_ptr + 1;`
69
70	13	ghutchis	`if (buf_ptr == str_buf_sz)`
71			`begin`
72			`$display ("%t: WARNING : String buffer reached maximum size without detecting EOL", $time);`
73			`$write ("%t: WARNING : Contents: ", $time);`
74			`for (i=0; i<buf_ptr; i=i+1)`
75			`$write ("%s", str_buf[i]);`
76			`$write ("\n");`
77			`buf_ptr = 0;`
78			`end`
79
80	2	ghutchis	`//$display ("%t: DEBUG : Detected write of character %x", $time, DO);`
81			`if (DO == 8'h0A)`
82			`begin`
83			`$write ("%t: PROGRAM : ", $time);`
84
85			`for (i=0; i<buf_ptr; i=i+1)`
86			`$write ("%s", str_buf[i]);`
87
88			`buf_ptr = 0;`
89			`end`
90			`end // case: 8'h81`
91
92			`8'h82 :`
93			`begin`
94			`timeout_ctl = DO;`
95			`end`
96
97			`8'h83 : max_timeout[7:0] = DO;`
98			`8'h84 : max_timeout[15:8] = DO;`
99
100			`8'h90 : int_countdown = DO;`
101			`endcase // case(addr)`
102			`end // always @ (posedge clk)`
103
104			`always @(posedge clk)`
105			`begin`
106			`if (timeout_ctl[1])`
107			`cur_timeout = 0;`
108			`else if (timeout_ctl[0])`
109			`cur_timeout = cur_timeout + 1;`
110
111			`if (cur_timeout >= max_timeout)`
112			`begin`
113			`$display ("%t: ERROR : Reached timeout %d cycles", $time, max_timeout);`
114			`tb_top.test_fail;`
115			`end`
116			`end // always @ (posedge clk)`
117
118			`always @(posedge clk)`
119			`begin`
120			`if (int_countdown == 1)`
121			`begin`
122			`tb_top.int_n <= #1 1'b0;`
123			`int_countdown = 0;`
124			`end`
125			`else if (int_countdown > 1)`
126			`int_countdown = int_countdown - 1;`
127			`end`
128
129			`endmodule // env_io`

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[/] [tv80/] [branches/] [hpa1/] [env/] [env_io.v] - Blame information for rev 86