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[/] [System09/] [trunk/] [rtl/] [VHDL/] [trace.vhd] - Blame information for rev 197

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1 99 davidgb
--===========================================================================--
2
--                                                                           --
3
--                Synthesizable Hardware Trace Capture                       --
4
--                                                                           --
5
--===========================================================================--
6
--
7
--  File name      : trace.vhd
8
--
9
--  Entity name    : trace
10
--
11
--  Purpose        : Implements a hardware real-time trace buffer for system09.
12
--                   Captures all the CPU bus cycles to a block RAM trace buffer.
13
--                   A trigger condition may be used to start or stop a trace 
14
--                   capture. The trigger condition is determined by the address,
15
--                   data and control, comparator and qualifier registers.
16
--                   The comparator registers determine the level of the signals 
17
--                   to trigger on. The qualifier registers determine if the 
18
--                   comparison is to be made for that bit (qualifier bit set) 
19
--                   or not (qualifier bit cleared). The hardware trace capture 
20
--                   module has 9 x 8 bit registers and 5 trace buffers. Separate 
21
--                   chip selects are provided for the register bank and trace 
22
--                   buffer bank. The individual trace buffers are selected via 
23
--                   the bank select register. Trace buffers may be read by the 
24
--                   CPU but are only written to when tracing CPU bus cycles.
25
--                   The lowest trace buffer address always points to the start
26
--                   of the trace capture. This is achieved by adding an offset
27
--                   to the buffer address which points to the last cycle captured. 
28
--
29
--  Dependencies   : ieee.Std_Logic_1164
30
--                   ieee.std_logic_unsigned
31
--
32
--  Author         : John E. Kent      
33
--
34
--  Email          : dilbert57@opencores.org      
35
--
36
--  Web            : http://opencores.org/project,system09
37
--
38
--  Description    : Register Memory Map
39
--
40
--                   Register Bank(CS_R)
41
--                   Base + $00 - Address Comparitor High Byte
42
--                   Base + $01 - Address Comparitor Low byte
43
--                   Base + $02 - Data    Comparitor
44
--                   Base + $03 - Control Comparitor
45
--                   Base + $04 - Address Qualifier High Byte
46
--                   Base + $05 - Address Qualifier Low byte
47
--                   Base + $06 - Data    Qualifier
48
--                   Base + $07 - Control Qualifier
49
--                   Base + $08 - Buffer  Bank Select
50
--                                Bits[2..0] Select Buffer Bank 0 to 4
51
--                  
52
--                   Buffer Bank (CS_B)
53
--                   Bank 0 - CPU Address high trace buffer
54
--                   Bank 1 - CPU Address low trace buffer
55
--                   Bank 2 - CPU Data output (write) trace buffer
56
--                   Bank 3 - CPU Data input (read) trace buffer
57
--                   Bank 4 - CPU Control signal trace buffer
58
-- 
59
--                   Address, Data and Control signals 
60
--                   must match in the Comparitor registers 
61
--                   Matches are qualified by setting a bit 
62
--                   in the Qualifier registers
63
--
64
--                   Control Comparitor / Control Qualify Write
65
--                   b0 - r/w        1=read   0=write
66
--                   b1 - vma        1=valid  0=invalid
67
--                   b5 - trace      1=enable 0=disable
68
--                   b6 - pre/post   1=before 0=after
69
--                   b7 - irq output 1=match  0=mismatch
70
-- 
71
--                   Control Qualifier Read
72
--                   b7 - Interrupt Flag (unmasked)
73
-- 
74
--  Copyright (C) 2004 - 2010 John Kent
75
--
76
--  This program is free software: you can redistribute it and/or modify
77
--  it under the terms of the GNU General Public License as published by
78
--  the Free Software Foundation, either version 3 of the License, or
79
--  (at your option) any later version.
80
--
81
--  This program is distributed in the hope that it will be useful,
82
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
83
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
84
--  GNU General Public License for more details.
85
--
86
--  You should have received a copy of the GNU General Public License
87
--  along with this program.  If not, see <http://www.gnu.org/licenses/>.
88
--
89
--===========================================================================--
90
--                                                                           --
91
--                            Revision History                               --
92
--                                                                           --
93
--===========================================================================--
94
--
95
-- Version  Date        Author        Description
96
--
97
-- 0.1      2004-06-19  John E. Kent  Initial version
98
-- 0.2      2010-08-09  John E. Kent  Updated header and added GPL
99
--                                    Added trigger on read or write data
100
--                                    (not just write data).
101
--                                    Rearranged register and buffer bank decoding
102
--                                    Added Generics for data width and buffer size
103
--
104
library ieee;
105
use ieee.std_logic_1164.all;
106
use ieee.std_logic_unsigned.all;
107
 
108
entity trace is
109
  generic (
110
    BUFF_SIZE     : integer := 9;          -- Buffer Address Bits (B4=9, B16=11)
111
    DATA_WIDTH    : integer := 8           -- Data Width
112
  )
113
  port (
114
    clk           : in  std_logic;         -- CPU bus clock
115
    rst           : in  std_logic;         -- Reset
116
    cs_r          : in  std_logic;             -- Register bank chip select
117
    cs_b          : in  std_logic;             -- Buffer bank chip select
118
    rw            : in  std_logic;         -- Read not Write
119
    addr          : in  std_logic_vector((2*DATA_WIDTH)-1 downto 0); -- CPU address / Trace buffer address in
120
    data_in       : in  std_logic_vector(DATA_WIDTH-1 downto 0);     -- CPU data out (write)/ Trace data in
121
    data_out      : out std_logic_vector(DATA_WIDTH-1 downto 0);     -- Trace data out (read)
122
    irq           : out std_logic;
123
    cpu_vma       : in  std_logic;                                   -- CPU VMA / Trace buffer VMA in
124
    cpu_data_in   : in  std_logic_vector(DATA_WIDTH-1 downto 0)      -- CPU read data in
125
  );
126
end;
127
 
128
architecture trace_arch of trace is
129
 
130
--
131
-- Registers
132
--
133
signal comp_addr_hi : std_logic_vector(DATA_WIDTH-1 downto 0); -- Address High Comparator  Reg
134
signal comp_addr_lo : std_logic_vector(DATA_WIDTH-1 downto 0); -- Address Low  Comparator  Reg
135
signal comp_data    : std_logic_vector(DATA_WIDTH-1 downto 0); -- Data         Comparator  Reg
136
signal comp_ctrl    : std_logic_vector(DATA_WIDTH-1 downto 0); -- Control Sig  Comparator  Reg
137
signal qual_addr_hi : std_logic_vector(DATA_WIDTH-1 downto 0); -- Address High Qualifier   Reg
138
signal qual_addr_lo : std_logic_vector(DATA_WIDTH-1 downto 0); -- Address Low  Qualifier   Reg
139
signal qual_data    : std_logic_vector(DATA_WIDTH-1 downto 0); -- Data         Qualifier   Reg
140
signal qual_ctrl    : std_logic_vector(DATA_WIDTH-1 downto 0); -- Control Sig  Qualifier   Reg
141
signal bank_reg     : std_logic_vector(DATA_WIDTH-1 downto 0); -- Trace Buffer Bank Select Reg
142
signal reg_data_out : std_logic_vector(DATA_WIDTH-1 downto 0); -- Register Data Output
143
 
144
--
145
-- Trace enable, counter and offset registers
146
--
147
signal trace_en     : std_logic;
148
signal trace_count  : std_logic_vector(BUFF_SIZE-1 downto 0);
149
signal trace_offset : std_logic_vector(BUFF_SIZE-1 downto 0);
150
 
151
--
152
-- Buffer address
153
--
154
signal buf_addr     : std_logic_vector(BUFF_SIZE-1 downto 0);
155
 
156
--
157
-- Block RAM buffer Mux signals
158
--
159
signal mux_stb      : std_logic;
160
signal mux_addr     : std_logic_vector(BUFF_SIZE-1 downto 0);
161
signal mux_we       : std_logic;
162
 
163
--
164
-- Block RAM trace buffer data outputs
165
--
166
signal buf_data_out_0 : std_logic_vector(DATA_WIDTH-1 downto 0);
167
signal buf_data_out_1 : std_logic_vector(DATA_WIDTH-1 downto 0);
168
signal buf_data_out_2 : std_logic_vector(DATA_WIDTH-1 downto 0);
169
signal buf_data_out_3 : std_logic_vector(DATA_WIDTH-1 downto 0);
170
signal buf_data_out_4 : std_logic_vector(DATA_WIDTH-1 downto 0);
171
signal buf_data_out   : std_logic_vector(DATA_WIDTH-1 downto 0);
172
 
173
--
174
-- Various other signals
175
--
176
signal irq_out      : std_logic;  -- Interrupt Request signal (unmasked)
177
signal qual_write   : std_logic;  -- Qualifier Control Register Write Strobe
178
signal qual_read    : std_logic;  -- Qualifier Control Register Read Strobe
179
signal trigger      : std_logic;  -- Event Trigger derived from bus comparator 
180
signal ctrl_in      : std_logic_vector(7 downto 0);
181
 
182
--
183
-- Block RAM Trace buffer
184
-- For Spartan 2 these will be B4  RAMs ( 512 Bytes)
185
-- For Spartan 3 these will be B16 RAMs (2048 Bytes)
186
--
187
component trace_ram
188
    Port (
189
       WB_CLK_I  : in  std_logic;
190
       WB_RST_I  : in  std_logic;
191
       WB_ADR_I  : in  std_logic_vector (BUFF_SIZE-1 downto 0);
192
       WB_DAT_O  : out std_logic_vector (DATA_WIDTH-1 downto 0);
193
       WB_DAT_I  : in  std_logic_vector (DATA_WIDTH-1 downto 0);
194
       WB_WE_I   : in  std_logic;
195
       WB_STB_I  : in  std_logic
196
    );
197
end component;
198
 
199
--
200
-- Start of Architecture
201
--
202
begin
203
 
204
--
205
-- Instantiate (Port Map) Block RAM trace buffers
206
--
207
 
208
--
209
-- Bank 0 - Trace buffer for CPU address high bits
210
--
211
trace_buffer_0 : trace_ram port map (
212
       WB_CLK_I  => clk,
213
       WB_RST_I  => rst,
214
       WB_ADR_I  => mux_addr,
215
       WB_DAT_O  => buf_data_out_0,
216
       WB_DAT_I  => addr((2*DATA_WIDTH)-1 downto DATA_WIDTH),
217
       WB_WE_I   => mux_we,
218
       WB_STB_I  => mux_stb
219
    );
220
 
221
--
222
-- Bank 1 - Trace buffer for CPU address low bits
223
--
224
trace_buffer_1 : trace_ram port map (
225
       WB_CLK_I  => clk,
226
       WB_RST_I  => rst,
227
       WB_ADR_I  => mux_addr,
228
       WB_DAT_O  => buf_data_out_1,
229
       WB_DAT_I  => addr(DATA_WIDTH-1 downto 0),
230
       WB_WE_I   => mux_we,
231
       WB_STB_I  => mux_stb
232
    );
233
 
234
--
235
-- Bank 2 - Trace buffer for CPU data out (write)
236
--
237
trace_buffer_2 : trace_ram port map (
238
       WB_CLK_I  => clk,
239
       WB_RST_I  => rst,
240
       WB_ADR_I  => mux_addr,
241
       WB_DAT_O  => buf_data_out_2,
242
       WB_DAT_I  => data_in(DATA_WIDTH-1 downto 0),
243
       WB_WE_I   => mux_we,
244
       WB_STB_I  => mux_stb
245
    );
246
 
247
--
248
-- Bank 3 - Trace buffer for CPU data in (read)
249
--
250
trace_buffer_3 : trace_ram port map (
251
       WB_CLK_I  => clk,
252
       WB_RST_I  => rst,
253
       WB_ADR_I  => mux_addr,
254
       WB_DAT_O  => buf_data_out_3,
255
       WB_DAT_I  => cpu_data_in(DATA_WIDTH-1 downto 0),
256
       WB_WE_I   => mux_we,
257
       WB_STB_I  => mux_stb
258
    );
259
 
260
--
261
-- Bank 4 - Trace buffer for CPU control bits
262
--
263
trace_buffer_4 : trace_ram port map (
264
       WB_CLK_I  => clk,
265
       WB_RST_I  => rst,
266
       WB_ADR_I  => mux_addr,
267
       WB_DAT_O  => buf_data_out_4,
268
       WB_DAT_I  => ctrl_in(DATA_WIDTH-1 downto 0),
269
       WB_WE_I   => mux_we,
270
       WB_STB_I  => mux_stb
271
    );
272
 
273
--------------------------------
274
--
275
-- Assign control signal input
276
--
277
--------------------------------
278
 
279
trace_ctrl_assign : process( irq_out, qual_ctrl, rw, cpu_vma )
280
begin
281
  ctrl_in(0) <= rw;
282
  ctrl_in(1) <= cpu_vma;
283
  ctrl_in(7 downto 2) <= (others=>'0');
284
end process;
285
 
286
--------------------------------
287
--
288
-- Write Trace Registers
289
--
290
--------------------------------
291
 
292
trace_reg_write : process( clk, rst, cs_r, rw, addr, data_in )
293
begin
294
  if clk'event and clk = '0' then
295
    qual_write  <= '0';
296
    if rst = '1' then
297
      comp_addr_hi <= (others=>'0');
298
      comp_addr_lo <= (others=>'0');
299
      comp_data    <= (others=>'0');
300
      comp_ctrl    <= (others=>'0');
301
      qual_addr_hi <= (others=>'0');
302
      qual_addr_lo <= (others=>'0');
303
      qual_data    <= (others=>'0');
304
      qual_ctrl    <= (others=>'0');
305
      bank_reg     <= (others=>'0');
306
    elsif cs_r = '1' and rw = '0' then
307
      case addr(3 downto 0) is
308
      when "0000" =>
309
        comp_addr_hi <= data_in;
310
      when "0001" =>
311
        comp_addr_lo <= data_in;
312
      when "0010" =>
313
        comp_data    <= data_in;
314
      when "0011" =>
315
        comp_ctrl    <= data_in;
316
      when "0100" =>
317
        qual_addr_hi <= data_in;
318
      when "0101" =>
319
        qual_addr_lo <= data_in;
320
      when "0110" =>
321
        qual_data    <= data_in;
322
      when "0111" =>
323
        qual_ctrl    <= data_in;
324
        qual_write   <= '1';
325
      when others =>
326
        bank_reg     <= data_in;
327
      end case;
328
    end if;
329
  end if;
330
end process;
331
 
332
------------------------------------------
333
--
334
-- Read Trace Register (output mux)
335
--
336
------------------------------------------
337
trace_reg_read : process( addr, rw, cs_r,
338
                          comp_addr_hi, comp_addr_lo, comp_data, comp_ctrl,
339
                          qual_addr_hi, qual_addr_lo, qual_data, qual_ctrl,
340
                          bank_reg, irq_out )
341
begin
342
  qual_read <= '0';
343
  case addr(3 downto 0) is
344
  when "0000" =>
345
    reg_data_out <= comp_addr_hi;
346
  when "0001" =>
347
    reg_data_out <= comp_addr_lo;
348
  when "0010" =>
349
    reg_data_out <= comp_data;
350
  when "0011" =>
351
    reg_data_out <= comp_ctrl;
352
  when "0100" =>
353
    reg_data_out <= qual_addr_hi;
354
  when "0101" =>
355
    reg_data_out <= qual_addr_lo;
356
  when "0110" =>
357
    reg_data_out <= qual_data;
358
  when "0111" =>
359
    qual_read    <= cs_r and rw;
360
    reg_data_out(6 downto 0) <= qual_ctrl(6 downto 0);
361
    reg_data_out(7) <= irq_out;
362
  when others =>
363
    reg_data_out <= bank_reg;
364
  end case;
365
 
366
end process;
367
 
368
 
369
--------------------------------
370
--
371
-- Read Trace Buffers
372
--
373
--------------------------------
374
 
375
trace_buf_read : process( bank_reg, buf_data_out_0, buf_data_out_1,
376
                          buf_data_out_2, buf_data_out_3, buf_data_out_4 )
377
begin
378
  case bank_reg(2 downto 0) is
379
  when "000" =>
380
    buf_data_out <= buf_data_out_0;
381
  when "001" =>
382
    buf_data_out <= buf_data_out_1;
383
  when "010" =>
384
    buf_data_out <= buf_data_out_2;
385
  when "011" =>
386
    buf_data_out <= buf_data_out_3;
387
  when "100" =>
388
    buf_data_out <= buf_data_out_4;
389
  when others =>
390
    buf_data_out <= (others=>'0');
391
  end case;
392
end process;
393
 
394
--------------------------------
395
--
396
-- Read Registers or Buffers
397
--
398
--------------------------------
399
 
400
trace_read : process( cs_r, reg_data_out, buf_data_out )
401
begin
402
  if cs_r = '1' then
403
    data_out = reg_data_out;
404
  else
405
    data_out = buf_data_out;
406
  else
407
end process;
408
 
409
 
410
------------------------------------------------------------------------
411
--
412
-- Multiplex the trace buffer between the trace capture and the CPU read
413
--
414
------------------------------------------------------------------------
415
 
416
trace_buf_mux : process( cs_b, trace_count, trace_en, buf_addr )
417
begin
418
  if cs_b = '0' then
419
    mux_addr <= trace_count;
420
    mux_we   <= '1';
421
    mux_stb  <= trace_en;
422
  else
423
    mux_addr <= buf_addr;
424
    mux_we   <= '0';
425
    mux_stb  <= '1';
426
  end if;
427
 
428
end process;
429
 
430
------------------------------
431
--
432
-- Trigger comparator process
433
--
434
------------------------------
435
 
436
trace_trigger : process( clk, rst, cs_r, addr, rw, cpu_vma, data_in, cpu_data_in,
437
                         comp_addr_hi, comp_addr_lo, comp_data, comp_ctrl,
438
                         qual_addr_hi, qual_addr_lo, qual_data, qual_ctrl)
439
variable hit          : std_logic;
440
variable miss_addr_hi : std_logic;
441
variable miss_addr_lo : std_logic;
442
variable miss_data_rd : std_logic;
443
variable miss_data_wr : std_logic;
444
variable miss_ctrl    : std_logic;
445
 
446
begin
447
  miss_addr_hi :=
448
     ((comp_addr_hi(7) xor addr(15)  ) and qual_addr_hi(7) ) or
449
     ((comp_addr_hi(6) xor addr(14)  ) and qual_addr_hi(6) ) or
450
     ((comp_addr_hi(5) xor addr(13)  ) and qual_addr_hi(5) ) or
451
     ((comp_addr_hi(4) xor addr(12)  ) and qual_addr_hi(4) ) or
452
     ((comp_addr_hi(3) xor addr(11)  ) and qual_addr_hi(3) ) or
453
     ((comp_addr_hi(2) xor addr(10)  ) and qual_addr_hi(2) ) or
454
     ((comp_addr_hi(1) xor addr( 9)  ) and qual_addr_hi(1) ) or
455
     ((comp_addr_hi(0) xor addr( 8)  ) and qual_addr_hi(0) );
456
  miss_addr_lo :=
457
     ((comp_addr_lo(7) xor addr( 7)  ) and qual_addr_lo(7) ) or
458
     ((comp_addr_lo(6) xor addr( 6)  ) and qual_addr_lo(6) ) or
459
     ((comp_addr_lo(5) xor addr( 5)  ) and qual_addr_lo(5) ) or
460
     ((comp_addr_lo(4) xor addr( 4)  ) and qual_addr_lo(4) ) or
461
     ((comp_addr_lo(3) xor addr( 3)  ) and qual_addr_lo(3) ) or
462
     ((comp_addr_lo(2) xor addr( 2)  ) and qual_addr_lo(2) ) or
463
     ((comp_addr_lo(1) xor addr( 1)  ) and qual_addr_lo(1) ) or
464
     ((comp_addr_lo(0) xor addr( 0)  ) and qual_addr_lo(0) );
465
  miss_data_wr :=
466
     ((comp_data(7)    xor data_in(7)) and qual_data(7)    ) or
467
     ((comp_data(6)    xor data_in(6)) and qual_data(6)    ) or
468
     ((comp_data(5)    xor data_in(5)) and qual_data(5)    ) or
469
     ((comp_data(4)    xor data_in(4)) and qual_data(4)    ) or
470
     ((comp_data(3)    xor data_in(3)) and qual_data(3)    ) or
471
     ((comp_data(2)    xor data_in(2)) and qual_data(2)    ) or
472
     ((comp_data(1)    xor data_in(1)) and qual_data(1)    ) or
473
     ((comp_data(0)    xor data_in(0)) and qual_data(0)    );
474
  miss_data_rd :=
475
     ((comp_data(7)    xor cpu_data_in(7)) and qual_data(7)    ) or
476
     ((comp_data(6)    xor cpu_data_in(6)) and qual_data(6)    ) or
477
     ((comp_data(5)    xor cpu_data_in(5)) and qual_data(5)    ) or
478
     ((comp_data(4)    xor cpu_data_in(4)) and qual_data(4)    ) or
479
     ((comp_data(3)    xor cpu_data_in(3)) and qual_data(3)    ) or
480
     ((comp_data(2)    xor cpu_data_in(2)) and qual_data(2)    ) or
481
     ((comp_data(1)    xor cpu_data_in(1)) and qual_data(1)    ) or
482
     ((comp_data(0)    xor cpu_data_in(0)) and qual_data(0)    );
483
  miss_ctrl :=
484
     ((comp_ctrl(0)    xor rw        ) and qual_ctrl(0)    ) or
485
     ((comp_ctrl(1)    xor cpu_vma   ) and qual_ctrl(1)    );
486
 
487
  hit := not( miss_addr_hi or miss_addr_lo or (miss_data_rd and not(miss_ctrl) and rw) or (miss_data_wr and not(miss_ctrl) and not(rw)) or miss_ctrl);
488
  trigger <= not(hit xor comp_ctrl(7));
489
 
490
end process;
491
 
492
-----------------------------------------
493
--
494
-- Trace buffer capture on event trigger
495
--
496
-----------------------------------------
497
 
498
trace_capture : process( clk, rst, addr, qual_write,
499
                         trigger, trace_en, qual_ctrl, irq_out,
500
                         trace_count, trace_offset )
501
begin
502
  if clk'event and clk = '1' then
503
    if rst = '1' then
504
      trace_count  <= (others=>'0');
505
      trace_offset <= (others=>'0');
506
      trace_en     <= '0';
507
      irq_out      <= '0';
508
    else
509
      --
510
      -- qualifier control register bit 6 = zero
511
      -- means start capture after trigger point.
512
      --
513
      if qual_ctrl(6) = '0' then
514
 
515
        --
516
        -- Activate trace on a trigger condition
517
        -- Deactive trace when the buffer is full
518
        --
519
        if trace_en = '0' then
520
          trace_en     <= trigger;
521
        elsif trace_count = trace_offset then
522
          trace_offset <= trace_count;
523
          trace_en     <= '0';
524
        end if;
525
 
526
        --
527
        -- Set IRQ on trace buffer full
528
        -- Reset IRQ on qualifier control register write
529
        --
530
        if qual_write = '1' then
531
          irq_out   <= '0';
532
        elsif trace_count = trace_offset then
533
          irq_out   <= '1';
534
        end if;
535
 
536
        --
537
      -- qualifier control register bit 6 = one
538
      -- means finish capture at trigger point.
539
      --
540
      else
541
        --
542
        -- Activate trace on qualifier control write
543
        -- Deactivate trace on a trigger condition
544
        --
545
        if trace_en = '0' then
546
          trace_en     <= qual_write;
547
        elsif trigger = '1' then
548
          trace_offset <= trace_count;
549
          trace_en     <= '0';
550
        end if;
551
 
552
        --
553
        -- Set IRQ on a trigger condition
554
        -- Reset IRQ on qualifier control register write
555
        --
556
        if qual_write = '1' then
557
          irq_out <= '0';
558
        elsif trigger = '1' then
559
          irq_out <= '1';
560
        end if;
561
 
562
      end if;
563
 
564
      trace_count <= trace_count + 1;
565
 
566
    end if;
567
  end if;
568
 
569
  --
570
  -- The IRQ output is qualified by the interrupt enable bit
571
  -- (bit 7 of the qualifier control register)
572
  --
573
  irq <= irq_out and qual_ctrl(7);
574
 
575
  --
576
  -- Trace buffer is offset by start address
577
  --
578
  buf_addr  <= addr(BUFF_SIZE-1 downto 0) + trace_offset;
579
 
580
end process;
581
 
582
end trace_arch;
583
 

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