source: trunk/MultiChannelUSB/control.v@ 88

Last change on this file since 88 was 87, checked in by demin, 15 years ago

fix writing of the last EPT sample to SRAM
File size: 8.8 KB
Line 
1module control
2 (
3 input wire clk,
4
5 output wire cfg_reset,
6 input wire [15:0] cfg_src_data,
7 output wire [15:0] cfg_src_addr, cfg_dst_data, cfg_dst_addr,
8
9 input wire rx_empty, tx_full,
10 input wire [7:0] rx_data,
11
12 input wire [1:0] mux_max_byte,
13 input wire [15:0] mux_min_addr, mux_max_addr,
14 input wire [7:0] mux_q,
15
16 output wire mux_reset,
17 output wire mux_type,
18 output wire [1:0] mux_chan,
19 output wire [1:0] mux_byte,
20 output wire [15:0] mux_addr,
21
22 output wire rx_rdreq,
23 output wire tx_wrreq,
24 output wire [7:0] tx_data,
25
26 output wire ram_we,
27 output wire [19:0] ram_addr,
28 inout wire [17:0] ram_data,
29
30 input wire ept_data_ready,
31 input wire [47:0] ept_data,
32
33 output wire i2c_wrreq,
34 output wire [15:0] i2c_data,
35 input wire i2c_full,
36
37 output wire led
38 );
39
40 reg [23:0] led_counter;
41 reg [19:0] ram_counter;
42 reg [10:0] tst_counter;
43 reg [15:0] int_addr, int_max_addr;
44
45 reg int_rdreq, int_wrreq;
46 reg int_type, int_reset;
47 reg [1:0] int_chan, int_byte, int_max_byte;
48 reg [7:0] int_data;
49 reg int_led;
50
51 reg [15:0] int_i2c_data;
52 reg int_i2c_wrreq;
53
54 reg [47:0] int_ept_data;
55
56 reg int_cfg_reset;
57 reg [15:0] int_dst_data, int_dst_addr;
58
59 wire crc_error = 1'b0;
60 reg crc_reset;
61 reg [1:0] byte_counter;
62 reg [4:0] idle_counter;
63
64 reg [4:0] state;
65
66 wire [15:0] src, dst;
67
68 reg [7:0] buffer [3:0];
69
70 assign src = (buffer[0][7]) ? cfg_src_data : {buffer[2], buffer[3]};
71 assign dst = {1'b0, buffer[0][6:0], buffer[1]};
72
73 reg int_ram_we;
74 reg [17:0] int_ram_data;
75 wire [17:0] int_ram_q;
76 wire [17:0] opt_ram_we;
77 assign ram_we = ~int_ram_we;
78 assign int_ram_q = ram_data;
79// assign ram_data = int_ram_we ? int_ram_data : 18'bz;
80// assign ram_addr = {ram_counter[18:5],1'd0,ram_counter[4:0]};
81 assign ram_addr = ram_counter;
82
83 genvar j;
84 generate
85 for (j = 0; j < 18; j = j + 1)
86 begin : SRAM_WE
87 assign opt_ram_we[j] = int_ram_we;
88 assign ram_data[j] = opt_ram_we[j] ? int_ram_data[j] : 1'bz;
89 end
90 endgenerate
91
92 always @(posedge clk)
93 begin
94 if (~rx_empty)
95 begin
96 int_led <= 1'b0;
97 led_counter <= 24'd0;
98 end
99 else
100 begin
101 if (&led_counter)
102 begin
103 int_led <= 1'b1;
104 end
105 else
106 begin
107 led_counter <= led_counter + 24'd1;
108 end
109 end
110
111 case(state)
112 0:
113 begin
114 int_rdreq <= 1'b1;
115 int_wrreq <= 1'b0;
116 int_type <= 1'b0;
117 int_chan <= 2'd0;
118 int_byte <= 2'd0;
119 int_reset <= 1'b0;
120 crc_reset <= 1'b0;
121 int_ram_we <= 1'b0;
122 int_ram_data <= 16'd0;
123 ram_counter <= 20'd0;
124 idle_counter <= 5'd0;
125 byte_counter <= 2'd0;
126 int_cfg_reset <= 1'b0;
127 state <= 5'd1;
128 end
129
130 1:
131 begin
132 // read 8 bytes
133 if (~rx_empty)
134 begin
135 idle_counter <= 5'd0;
136 byte_counter <= byte_counter + 2'd1;
137 buffer[byte_counter] <= rx_data;
138 if (&byte_counter)
139 begin
140 int_rdreq <= 1'b0;
141 state <= 5'd2;
142 end
143 end
144 else if(|byte_counter)
145 begin
146 idle_counter <= idle_counter + 5'd1;
147 if (&idle_counter)
148 begin
149 int_rdreq <= 1'b0;
150 crc_reset <= 1'b1;
151 state <= 5'd0;
152 end
153 end
154 end
155
156 2:
157 begin
158 crc_reset <= 1'b1;
159 if (~crc_error)
160 begin
161 int_dst_addr <= dst;
162 int_dst_data <= src;
163// memory[dst[3:0]] <= src;
164
165 case (dst)
166 16'h0000:
167 begin
168 int_cfg_reset <= 1'b1;
169 state <= 5'd0;
170 end
171
172 16'h0001:
173 begin
174 int_type <= src[4];
175 int_chan <= src[1:0];
176 int_reset <= 1'b1;
177 state <= 5'd0;
178 end
179
180 16'h0002:
181 begin
182 int_type <= src[4];
183 int_chan <= src[1:0];
184 state <= 5'd3;
185 end
186
187 16'h0003:
188 begin
189 tst_counter <= 11'd0;
190 state <= 5'd7;
191 end
192 16'h0004:
193 begin
194 int_ram_we <= 1'b1;
195 int_ram_data <= 18'd0;
196 ram_counter <= 20'd0;
197 state <= 5'd10;
198 end
199 16'h0005:
200 begin
201 int_i2c_data <= src;
202 int_i2c_wrreq <= 1'b1;
203 state <= 5'd16;
204 end
205 16'h0006:
206 begin
207 int_ram_we <= 1'b1;
208 int_ram_data <= 18'd0;
209 ram_counter <= 20'd0;
210 state <= 5'd17;
211 end
212
213 default:
214 begin
215 state <= 5'd0;
216 end
217 endcase
218 end
219 end
220
221 // mux transfer
222 3:
223 begin
224 crc_reset <= 1'b0;
225 int_addr <= mux_min_addr;
226 int_max_addr <= mux_min_addr + mux_max_addr;
227 int_max_byte <= mux_max_byte;
228 int_byte <= 2'd0;
229 state <= 5'd4;
230 end
231
232 4:
233 begin
234 int_wrreq <= 1'b0;
235 state <= 5'd5;
236 end
237
238 5:
239 begin
240 state <= 5'd6;
241 end
242
243 6:
244 begin
245 if (~tx_full)
246 begin
247 int_data <= mux_q;
248 int_wrreq <= 1'b1;
249 if ((int_byte == int_max_byte) && (int_addr == int_max_addr))
250 begin
251 state <= 5'd0;
252 end
253 else
254 begin
255 state <= 5'd4;
256 if (int_byte == int_max_byte)
257 begin
258 int_addr <= int_addr + 16'd1;
259 int_byte <= 2'd0;
260 end
261 else
262 begin
263 int_byte <= int_byte + 2'd1;
264 end
265 end
266 end
267 end
268
269 // tst transfer
270 7:
271 begin
272 crc_reset <= 1'b0;
273 int_data <= tst_counter;
274 int_wrreq <= 1'b1;
275 tst_counter <= tst_counter + 11'd1;
276 state <= 5'd8;
277 end
278 8:
279 begin
280 if (~tx_full)
281 begin
282 int_data <= tst_counter;
283 if (&tst_counter)
284 begin
285 state <= 5'd9;
286 end
287 else
288 begin
289 tst_counter <= tst_counter + 11'd1;
290 end
291 end
292 end
293 9:
294 begin
295 if (~tx_full)
296 begin
297 int_wrreq <= 1'b0;
298 state <= 5'd0;
299 end
300 end
301 // ram transfer
302 10:
303 begin
304 crc_reset <= 1'b0;
305 state <= 5'd11;
306 end
307 11:
308 begin
309 int_ram_data[8:1] <= ram_counter[7:0];
310// int_ram_data[8:1] <= 8'd0;
311 if (&ram_counter[18:0])
312 begin
313 state <= 5'd12;
314 end
315 else
316 begin
317 state <= 5'd10;
318 ram_counter <= ram_counter + 20'd1;
319 end
320 end
321 12:
322 begin
323 int_ram_we <= 1'b0;
324 int_ram_data <= 18'd0;
325 ram_counter <= 20'd0;
326 state <= 5'd13;
327 end
328 13:
329 begin
330 int_wrreq <= 1'b0;
331 state <= 5'd14;
332 end
333 14:
334 begin
335 state <= 5'd15;
336 end
337 15:
338 begin
339 if (~tx_full)
340 begin
341 int_data <= int_ram_q[8:1];
342 int_wrreq <= 1'b1;
343 if (&ram_counter[18:0])
344 begin
345 state <= 5'd0;
346 end
347 else
348 begin
349 state <= 5'd13;
350 ram_counter <= ram_counter + 20'd1;
351 end
352 end
353 end
354
355 // i2c write
356 16:
357 begin
358 crc_reset <= 1'b0;
359 if (~i2c_full)
360 begin
361 int_i2c_wrreq <= 1'b0;
362 state <= 5'd0;
363 end
364 end
365
366 // long sample transfer
367 17:
368 begin
369 crc_reset <= 1'b0;
370 if (ept_data_ready)
371 begin
372 ram_counter <= ram_counter + 20'd1;
373 int_ept_data <= ept_data;
374 state <= 5'd18;
375 end
376 end
377 18:
378 begin
379 int_ram_data[8:1] <= int_ept_data[7:0];
380 int_ram_data[17:10] <= int_ept_data[15:8];
381 ram_counter <= ram_counter + 20'd1;
382 state <= 5'd19;
383 end
384 19:
385 begin
386 int_ram_data[8:1] <= int_ept_data[23:16];
387 int_ram_data[17:10] <= int_ept_data[31:24];
388 ram_counter <= ram_counter + 20'd1;
389 state <= 5'd20;
390 end
391
392 20:
393 begin
394 int_ram_data[8:1] <= int_ept_data[39:32];
395 int_ram_data[17:10] <= int_ept_data[47:40];
396 if (&ram_counter)
397 begin
398 int_ram_we <= 1'b0;
399 ram_counter <= 19'd0;
400 state <= 5'd21;
401 end
402 else
403 begin
404 state <= 5'd17;
405 end
406 end
407
408 21:
409 begin
410 int_wrreq <= 1'b0;
411 state <= 5'd22;
412 end
413
414 22:
415 begin
416 state <= 5'd23;
417 end
418
419 23:
420 begin
421 if (~tx_full)
422 begin
423 int_data <= int_ram_q[8:1];
424 int_wrreq <= 1'b1;
425 state <= 5'd24;
426 end
427 end
428
429 24:
430 begin
431 int_data <= int_ram_q[17:10];
432 state <= 5'd25;
433 end
434
435 25:
436 begin
437 if (~tx_full)
438 begin
439 int_wrreq <= 1'b0;
440 if (&ram_counter)
441 begin
442 state <= 5'd0;
443 end
444 else
445 begin
446 state <= 5'd21;
447 ram_counter <= ram_counter + 20'd1;
448 end
449 end
450 end
451
452 default:
453 begin
454 state <= 5'd0;
455 end
456 endcase
457 end
458
459 assign cfg_reset = int_cfg_reset;
460 assign cfg_src_addr = {buffer[2], buffer[3]};
461 assign cfg_dst_data = int_dst_data;
462 assign cfg_dst_addr = int_dst_addr;
463 assign mux_reset = int_reset;
464 assign mux_type = int_type;
465 assign mux_chan = int_chan;
466 assign mux_byte = int_byte;
467 assign mux_addr = int_addr;
468 assign rx_rdreq = int_rdreq & (~rx_empty);
469 assign tx_wrreq = int_wrreq & (~tx_full);
470 assign tx_data = int_data;
471 assign i2c_wrreq = int_i2c_wrreq;
472 assign i2c_data = int_i2c_data;
473 assign led = int_led;
474
475endmodule
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