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1 | `include "gc.v" | |
2 | `include "eval.v" | |
3 | `include "reader.v" | |
4 | `include "uart.v" | |
5 | `include "writer.v" | |
6 | ||
7 | `define GCOP_NOP 4'd0 | |
8 | `define GCOP_CDR 4'd1 | |
9 | `define GCOP_CAR 4'd2 | |
10 | `define GCOP_CDRQ 4'd3 | |
11 | `define GCOP_CARQ 4'd4 | |
12 | `define GCOP_CARR 4'd5 | |
13 | `define GCOP_CDRRX 4'd6 | |
14 | `define GCOP_CARRX 4'd7 | |
15 | `define GCOP_CDRQX 4'd8 | |
16 | `define GCOP_CONS 4'd9 | |
17 | `define GCOP_XCONS 4'd10 | |
18 | `define GCOP_RPLACDR 4'd11 | |
19 | `define GCOP_LDQ 4'd12 | |
20 | `define GCOP_RDQ 4'd13 | |
21 | `define GCOP_RDQA 4'd14 | |
22 | `define GCOP_RDQCDRRX 4'd15 | |
23 | ||
24 | `ifdef SIM | |
25 | `define UART_DIVIDE 1 | |
26 | `else | |
27 | `define UART_DIVIDE 625 | |
28 | `endif | |
29 | ||
30 | module cpu (input clk, output [4:0] led, output uart_tx, input uart_rx); | |
31 | wire [15:0] result; | |
32 | ||
33 | reg [5:0] initial_reset = 30; | |
34 | always @ (posedge clk) | |
35 | if (initial_reset) initial_reset <= initial_reset - 1; | |
36 | ||
37 | wire reset = |initial_reset || reader_active || writer_clock_enable; | |
38 | reg [1:0] counter = 0; | |
39 | ||
40 | wire gc_clock_enable = counter[0] & counter[1] & !reset; | |
41 | wire eval_clock_enable = counter[0] & !counter[1] & step_eval & !reset; | |
42 | wire writer_clock_enable = counter[0] & counter[1] & writer_active; | |
43 | ||
44 | always @ (posedge clk) | |
45 | counter <= counter + 1; | |
46 | ||
47 | wire [12:0] P; | |
48 | wire [15:0] E1; | |
49 | wire [15:0] E2; | |
50 | wire [3:0] gcop; | |
51 | wire [5:0] gostate; | |
52 | wire [5:0] eostate; | |
53 | wire conn_ea; | |
54 | wire conn_et; | |
55 | ||
56 | wire step_eval; | |
57 | ||
58 | wire gc_ram_we; | |
59 | wire [12:0] gc_ram_addr; | |
60 | wire [15:0] gc_ram_di; | |
61 | ||
62 | wire reader_ram_we; | |
63 | wire [12:0] reader_ram_addr; | |
64 | wire [15:0] reader_ram_di; | |
65 | ||
66 | wire [12:0] writer_ram_addr; | |
67 | ||
68 | wire reader_active; | |
69 | ||
70 | wire ram_we = reader_active ? reader_ram_we : gc_ram_we; | |
71 | wire [12:0] ram_addr = reader_active ? reader_ram_addr : writer_active ? writer_ram_addr : gc_ram_addr; | |
72 | wire [15:0] ram_di = reader_active ? reader_ram_di : gc_ram_di; | |
73 | wire [15:0] ram_do; | |
74 | ||
75 | wire writer_finished; | |
76 | reg writer_started = 0; | |
77 | reg writer_active = 0; | |
78 | ||
79 | GCRAM gcram (.clk(clk), .we(ram_we), .addr(ram_addr), .di(ram_di), .do(ram_do)); | |
80 | ||
81 | GC gc (.clk(clk), .rst(reset), .clk_enable(gc_clock_enable), .Ein(E1), .Eout(E2), .gcop(gcop), .ostate(gostate), .step_eval(step_eval), .conn_ea(conn_ea), .conn_et(conn_et), .ram_we(gc_ram_we), .ram_addr(gc_ram_addr), .ram_di(gc_ram_di), .ram_do(ram_do), .Pout(P)); | |
82 | ||
83 | EVAL eval (.clk(clk), .rst(reset), .clk_enable(eval_clock_enable), .Ein(E2), .Eout(E1), .gcop(gcop), .ostate(eostate), .conn_ea(conn_ea), .conn_et(conn_et)); | |
84 | ||
85 | READER reader (.clk(clk), .clk_enable(!initial_reset), .uart_rx_byte(uart_rx_byte), .uart_rx_signal(uart_rx_signal), .uart_is_receiving(uart_is_receiving), .active(reader_active), .ram_we(reader_ram_we), .ram_addr(reader_ram_addr), .ram_di(reader_ram_di)); | |
86 | ||
87 | WRITER writer (.clk(clk), .clk_enable(writer_clock_enable), .uart_tx_byte(uart_tx_byte), .uart_tx_signal(uart_tx_signal), .uart_is_transmitting(uart_is_transmitting), .finished(writer_finished), .ram_addr(writer_ram_addr), .ram_do(ram_do), .P(P)); | |
88 | ||
89 | // UART outputs | |
90 | wire uart_rx_signal; | |
91 | wire [7:0] uart_rx_byte; | |
92 | wire uart_is_receiving; | |
93 | wire uart_is_transmitting; | |
94 | wire uart_rx_error; | |
95 | ||
96 | // UART logic | |
97 | wire uart_tx_signal; | |
98 | wire [7:0] uart_tx_byte; | |
99 | ||
100 | always @ (posedge clk) begin | |
101 | if(writer_finished) | |
102 | writer_active <= 0; | |
103 | ||
104 | if(reader_active) begin | |
105 | writer_started <= 0; | |
106 | end else if(eostate == 5'd7 && !writer_started) begin | |
107 | writer_started <= 1; | |
108 | writer_active <= 1; | |
109 | end | |
110 | end | |
111 | ||
112 | // 4800 baud uart | |
113 | uart #(.CLOCK_DIVIDE(`UART_DIVIDE)) uart (.clk(clk), .rx(uart_rx), .tx(uart_tx), .transmit(uart_tx_signal), .tx_byte(uart_tx_byte), .received(uart_rx_signal), .rx_byte(uart_rx_byte), .is_receiving(uart_is_receiving), .is_transmitting(uart_is_transmitting), .recv_error (uart_rx_error)); | |
114 | ||
115 | // Assign the outputs | |
116 | assign led[0] = eval_clock_enable; | |
117 | assign led[1] = uart_is_transmitting; | |
118 | assign led[2] = uart_is_receiving; | |
119 | assign led[3] = writer_finished; | |
120 | assign led[4] = !reset; | |
121 | endmodule |