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/* MC6809/HD6309 Compatible core
 * (c) 2013 R.A. Paz Schmidt rapazschmidt@gmail.com
 *
 * Distributed under the terms of the Lesser GPL
 */
`timescale 1ns/1ns
 
module tb(output wire [15:0] addr_o, output wire [7:0] data_o_o);
 
reg clk, reset;
 
assign addr_o = addr;
assign data_o_o = data_o;
wire [15:0] addr;
wire [7:0] data_o, data_i;
wire oe, we;
always
        #5 clk = ~clk;
 
MC6809_cpu cpu(
        .cpu_clk(clk),
        .cpu_reset(reset),
        .cpu_we_o(we),
        .cpu_oe_o(oe),
        .cpu_addr_o(addr),
        .cpu_data_i(data_i),
        .cpu_data_o(data_o)
        );
 
memory imem(addr, !oe, !we, data_i, data_o);
 
initial
        begin
                $dumpvars;
                clk = 0;
                reset = 1;
                #0
                #46
                reset = 0;
                #7000
                $finish;
        end
 
endmodule
 
module memory(
        input wire [15:0] addr,
        input wire oe,
        input wire we,
        output wire [7:0] data_o,
        input wire [7:0] data_i
        );
 
reg [7:0] mem[65535:0];
reg [7:0] latecheddata;
wire [7:0] mem0, mem1, mem2, mem3;
 
assign mem0 = mem[0];
assign mem1 = mem[1];
assign mem2 = mem[2];
assign mem3 = mem[3];
 
assign data_o = latecheddata;
always @(negedge oe)
        latecheddata <= mem[addr];
 
always @(negedge we)
        begin
                mem[addr] <= data_i;
                $display("W %04x = %02x %t", addr, data_i, $time);
        end
 
always @(negedge oe)
        begin
                $display("R %04x = %02x %t", addr, mem[addr], $time);
        end
//`define READTESTBIN
integer i;
initial
        begin
`ifdef READTESTBIN
                $readmemh("instructions_test.hex", mem);
                $display("instructions_test.hex read");
                mem[16'hfffe] = 8'hf0; // setup reset
                mem[16'hffff] = 8'h00;
`else
                for (i = 0; i < 65536; i=i+1)
                        mem[i] = 8'ha5;
 
                mem[16'h1000] = 8'h8e; // ldx #$100
                mem[16'h1001] = 8'h01; // 
                mem[16'h1002] = 8'h00; // 
 
                mem[16'h1003] = 8'hbf; // stx #$102             
                mem[16'h1004] = 8'h01; // 
                mem[16'h1005] = 8'h02; // 
 
                mem[16'h1006] = 8'hbd; // jsr #$1010
                mem[16'h1007] = 8'h10; // 
                mem[16'h1008] = 8'h10; // 
 
                mem[16'h1009] = 8'h20; // bra *
                mem[16'h100a] = 8'hfe; // 
 
                mem[16'h100b] = 8'hc1; // 
                mem[16'h100c] = 8'h10; // 
                mem[16'h100d] = 8'h26; // 
                mem[16'h100e] = 8'hf7; // 
 
                mem[16'h100f] = 8'h4c; // 
 
                mem[16'h1010] = 8'h4f; // clra
                mem[16'h1011] = 8'h5f; // clrb
                mem[16'h1012] = 8'h39; // rts
 
 
 
/*
// test indexed store
                mem[16'h1000] = 8'h86; // lda #$02
                mem[16'h1001] = 8'h02; //
                mem[16'h1002] = 8'h9e; // ldx $00 (direct)
                mem[16'h1003] = 8'h00; //
 
                mem[16'h1004] = 8'ha7; // lda ,x
                mem[16'h1005] = 8'b10000100; // ofs0
                mem[16'h1006] = 8'ha7; // lda ,x+
                mem[16'h1007] = 8'b10000000; //
 
 
                mem[16'h1008] = 8'ha7; // lda ,x++
                mem[16'h1009] = 8'b10000001; //
                mem[16'h100a] = 8'ha6; // lda ,-x
                mem[16'h100b] = 8'b10000010; //
 
                mem[16'h100c] = 8'ha7; // lda ,--x
                mem[16'h100d] = 8'b10000011; //
 
                mem[16'h100e] = 8'ha7; // lda 0,x ofs 5
                mem[16'h100f] = 8'h00; //
 
                mem[16'h1010] = 8'ha7; // lda 0,x ofs 8
                mem[16'h1011] = 8'b10001000; //
                mem[16'h1012] = 8'h00; //
 
                mem[16'h1013] = 8'ha7; // lda 0,x ofs 16
                mem[16'h1014] = 8'b10001001; //
                mem[16'h1015] = 8'h00; //
                mem[16'h1016] = 8'h00; //
*/
 
/* test indexed load
                mem[16'h1000] = 8'h86; // lda #$02
                mem[16'h1001] = 8'h02; //
                mem[16'h1002] = 8'h9e; // ldx $00 (direct)
                mem[16'h1003] = 8'h00; //
 
                mem[16'h1004] = 8'ha6; // lda ,x
                mem[16'h1005] = 8'b10000100; // ofs0
                mem[16'h1006] = 8'ha6; // lda ,x+
                mem[16'h1007] = 8'b10000000; //
 
 
                mem[16'h1008] = 8'ha6; // lda ,x++
                mem[16'h1009] = 8'b10000001; //
                mem[16'h100a] = 8'ha6; // lda ,-x
                mem[16'h100b] = 8'b10000010; //
 
                mem[16'h100c] = 8'ha6; // lda ,--x
                mem[16'h100d] = 8'b10000011; //
 
                mem[16'h100e] = 8'ha6; // lda 0,x ofs 5
                mem[16'h100f] = 8'h00; //
 
                mem[16'h1010] = 8'ha6; // lda 0,x ofs 8
                mem[16'h1011] = 8'b10001000; //
                mem[16'h1012] = 8'h00; //
 
                mem[16'h1013] = 8'ha6; // lda 0,x ofs 16
                mem[16'h1014] = 8'b10001001; //
                mem[16'h1015] = 8'h00; //
                mem[16'h1016] = 8'h00; //
*/
 
/* test extended
                mem[16'h1000] = 8'h86; // ldb #$fe
                mem[16'h1001] = 8'h02; //
                mem[16'h1002] = 8'hc6; // lda #$0
                mem[16'h1003] = 8'h00; //
 
                mem[16'h1004] = 8'h97; // inca
                mem[16'h1005] = 8'h00; // sta $0000
                mem[16'h1006] = 8'hd7; //
                mem[16'h1007] = 8'h01; //
 
 
                mem[16'h1008] = 8'hb6; // lda $0000
                mem[16'h1009] = 8'h00; //
                mem[16'h100a] = 8'h00; //
 
                mem[16'h100b] = 8'h26; // bne$.-5
                mem[16'h100c] = 8'hf7; //
 
                mem[16'h100d] = 8'h5c; // incb
 
                mem[16'h100e] = 8'hf7; // stb $0001
                mem[16'h100f] = 8'h00; //
                mem[16'h1010] = 8'h01; //
 
                mem[16'h1011] = 8'h20; // bra
                mem[16'h1012] = 8'hec; // $.-18
*/
                mem[16'hfff0] = 8'h20; // reset
                mem[16'hfff1] = 8'h00;
                mem[16'hfff2] = 8'h20; // reset
                mem[16'hfff3] = 8'h02;
                mem[16'hfff4] = 8'h20; // reset
                mem[16'hfff5] = 8'h04;
                mem[16'hfff6] = 8'h20; // reset
                mem[16'hfff7] = 8'h06;
                mem[16'hfff8] = 8'h20; // reset
                mem[16'hfff9] = 8'h08;
                mem[16'hfffa] = 8'h20; // reset
                mem[16'hfffb] = 8'h0a;
                mem[16'hfffc] = 8'h20; // reset
                mem[16'hfffd] = 8'h0c;
                mem[16'hfffe] = 8'h10; // reset
                mem[16'hffff] = 8'h00;
`endif
        end
 
endmodule

Line No.	Rev	Author	Line
1	2	ale500	`/* MC6809/HD6309 Compatible core`
2			`* (c) 2013 R.A. Paz Schmidt rapazschmidt@gmail.com`
3			`*`
4			`* Distributed under the terms of the Lesser GPL`
5			`*/`
6	4	ale500	`timescale 1ns/1ns
7
8			`module tb(output wire [15:0] addr_o, output wire [7:0] data_o_o);`
9
10			`reg clk, reset;`
11
12			`assign addr_o = addr;`
13			`assign data_o_o = data_o;`
14			`wire [15:0] addr;`
15			`wire [7:0] data_o, data_i;`
16			`wire oe, we;`
17			`always`
18			`#5 clk = ~clk;`
19
20			`MC6809_cpu cpu(`
21			`.cpu_clk(clk),`
22			`.cpu_reset(reset),`
23			`.cpu_we_o(we),`
24			`.cpu_oe_o(oe),`
25			`.cpu_addr_o(addr),`
26			`.cpu_data_i(data_i),`
27			`.cpu_data_o(data_o)`
28			`);`
29
30			`memory imem(addr, !oe, !we, data_i, data_o);`
31	2	ale500
32			`initial`
33			`begin`
34	4	ale500	`$dumpvars;`
35			`clk = 0;`
36			`reset = 1;`
37			`#0`
38			`#46`
39			`reset = 0;`
40	7	ale500	`#7000`
41	4	ale500	`$finish;`
42			`end`
43
44			`endmodule`
45
46	2	ale500	`module memory(`
47			`input wire [15:0] addr,`
48			`input wire oe,`
49			`input wire we,`
50			`output wire [7:0] data_o,`
51			`input wire [7:0] data_i`
52			`);`
53
54			`reg [7:0] mem[65535:0];`
55			`reg [7:0] latecheddata;`
56			`wire [7:0] mem0, mem1, mem2, mem3;`
57
58			`assign mem0 = mem[0];`
59			`assign mem1 = mem[1];`
60			`assign mem2 = mem[2];`
61			`assign mem3 = mem[3];`
62
63	4	ale500	`assign data_o = latecheddata;`
64			`always @(negedge oe)`
65	2	ale500	`latecheddata <= mem[addr];`
66
67	4	ale500	`always @(negedge we)`
68			`begin`
69	2	ale500	`mem[addr] <= data_i;`
70			`$display("W %04x = %02x %t", addr, data_i, $time);`
71			`end`
72
73			`always @(negedge oe)`
74			`begin`
75			`$display("R %04x = %02x %t", addr, mem[addr], $time);`
76			`end`
77	10	ale500	//`define READTESTBIN
78	2	ale500	`integer i;`
79			`initial`
80			`begin`
81			`ifdef READTESTBIN
82			`$readmemh("instructions_test.hex", mem);`
83			`$display("instructions_test.hex read");`
84	10	ale500	`mem[16'hfffe] = 8'hf0; // setup reset`
85	2	ale500	`mem[16'hffff] = 8'h00;`
86			`else
87			`for (i = 0; i < 65536; i=i+1)`
88			`mem[i] = 8'ha5;`
89	10	ale500
90			`mem[16'h1000] = 8'h8e; // ldx #$100`
91			`mem[16'h1001] = 8'h01; //`
92			`mem[16'h1002] = 8'h00; //`
93
94			`mem[16'h1003] = 8'hbf; // stx #$102`
95			`mem[16'h1004] = 8'h01; //`
96			`mem[16'h1005] = 8'h02; //`
97
98			`mem[16'h1006] = 8'hbd; // jsr #$1010`
99			`mem[16'h1007] = 8'h10; //`
100			`mem[16'h1008] = 8'h10; //`
101
102			`mem[16'h1009] = 8'h20; // bra *`
103			`mem[16'h100a] = 8'hfe; //`
104
105			`mem[16'h100b] = 8'hc1; //`
106			`mem[16'h100c] = 8'h10; //`
107			`mem[16'h100d] = 8'h26; //`
108			`mem[16'h100e] = 8'hf7; //`
109
110			`mem[16'h100f] = 8'h4c; //`
111
112			`mem[16'h1010] = 8'h4f; // clra`
113			`mem[16'h1011] = 8'h5f; // clrb`
114			`mem[16'h1012] = 8'h39; // rts`
115	2	ale500
116
117
118			`/*`
119			`// test indexed store`
120	4	ale500	`mem[16'h1000] = 8'h86; // lda #$02`
121	2	ale500	`mem[16'h1001] = 8'h02; //`
122			`mem[16'h1002] = 8'h9e; // ldx $00 (direct)`
123			`mem[16'h1003] = 8'h00; //`
124
125			`mem[16'h1004] = 8'ha7; // lda ,x`
126			`mem[16'h1005] = 8'b10000100; // ofs0`
127			`mem[16'h1006] = 8'ha7; // lda ,x+`
128			`mem[16'h1007] = 8'b10000000; //`
129
130
131			`mem[16'h1008] = 8'ha7; // lda ,x++`
132			`mem[16'h1009] = 8'b10000001; //`
133			`mem[16'h100a] = 8'ha6; // lda ,-x`
134			`mem[16'h100b] = 8'b10000010; //`
135
136			`mem[16'h100c] = 8'ha7; // lda ,--x`
137			`mem[16'h100d] = 8'b10000011; //`
138
139			`mem[16'h100e] = 8'ha7; // lda 0,x ofs 5`
140			`mem[16'h100f] = 8'h00; //`
141
142			`mem[16'h1010] = 8'ha7; // lda 0,x ofs 8`
143			`mem[16'h1011] = 8'b10001000; //`
144			`mem[16'h1012] = 8'h00; //`
145
146			`mem[16'h1013] = 8'ha7; // lda 0,x ofs 16`
147			`mem[16'h1014] = 8'b10001001; //`
148			`mem[16'h1015] = 8'h00; //`
149			`mem[16'h1016] = 8'h00; //`
150			`*/`
151
152			`/* test indexed load`
153			`mem[16'h1000] = 8'h86; // lda #$02`
154			`mem[16'h1001] = 8'h02; //`
155			`mem[16'h1002] = 8'h9e; // ldx $00 (direct)`
156			`mem[16'h1003] = 8'h00; //`
157
158			`mem[16'h1004] = 8'ha6; // lda ,x`
159			`mem[16'h1005] = 8'b10000100; // ofs0`
160			`mem[16'h1006] = 8'ha6; // lda ,x+`
161			`mem[16'h1007] = 8'b10000000; //`
162
163
164			`mem[16'h1008] = 8'ha6; // lda ,x++`
165			`mem[16'h1009] = 8'b10000001; //`
166			`mem[16'h100a] = 8'ha6; // lda ,-x`
167			`mem[16'h100b] = 8'b10000010; //`
168
169			`mem[16'h100c] = 8'ha6; // lda ,--x`
170			`mem[16'h100d] = 8'b10000011; //`
171
172			`mem[16'h100e] = 8'ha6; // lda 0,x ofs 5`
173			`mem[16'h100f] = 8'h00; //`
174
175			`mem[16'h1010] = 8'ha6; // lda 0,x ofs 8`
176			`mem[16'h1011] = 8'b10001000; //`
177			`mem[16'h1012] = 8'h00; //`
178
179			`mem[16'h1013] = 8'ha6; // lda 0,x ofs 16`
180			`mem[16'h1014] = 8'b10001001; //`
181			`mem[16'h1015] = 8'h00; //`
182			`mem[16'h1016] = 8'h00; //`
183			`*/`
184
185	10	ale500	`/* test extended`
186	4	ale500	`mem[16'h1000] = 8'h86; // ldb #$fe`
187			`mem[16'h1001] = 8'h02; //`
188			`mem[16'h1002] = 8'hc6; // lda #$0`
189	2	ale500	`mem[16'h1003] = 8'h00; //`
190
191	4	ale500	`mem[16'h1004] = 8'h97; // inca`
192			`mem[16'h1005] = 8'h00; // sta $0000`
193			`mem[16'h1006] = 8'hd7; //`
194			`mem[16'h1007] = 8'h01; //`
195	2	ale500
196
197			`mem[16'h1008] = 8'hb6; // lda $0000`
198			`mem[16'h1009] = 8'h00; //`
199			`mem[16'h100a] = 8'h00; //`
200
201			`mem[16'h100b] = 8'h26; // bne$.-5`
202			`mem[16'h100c] = 8'hf7; //`
203
204			`mem[16'h100d] = 8'h5c; // incb`
205
206			`mem[16'h100e] = 8'hf7; // stb $0001`
207			`mem[16'h100f] = 8'h00; //`
208			`mem[16'h1010] = 8'h01; //`
209
210			`mem[16'h1011] = 8'h20; // bra`
211			`mem[16'h1012] = 8'hec; // $.-18`
212	10	ale500	`*/`
213	2	ale500	`mem[16'hfff0] = 8'h20; // reset`
214			`mem[16'hfff1] = 8'h00;`
215			`mem[16'hfff2] = 8'h20; // reset`
216			`mem[16'hfff3] = 8'h02;`
217			`mem[16'hfff4] = 8'h20; // reset`
218			`mem[16'hfff5] = 8'h04;`
219			`mem[16'hfff6] = 8'h20; // reset`
220			`mem[16'hfff7] = 8'h06;`
221			`mem[16'hfff8] = 8'h20; // reset`
222			`mem[16'hfff9] = 8'h08;`
223			`mem[16'hfffa] = 8'h20; // reset`
224			`mem[16'hfffb] = 8'h0a;`
225			`mem[16'hfffc] = 8'h20; // reset`
226			`mem[16'hfffd] = 8'h0c;`
227			`mem[16'hfffe] = 8'h10; // reset`
228			`mem[16'hffff] = 8'h00;`
229			`endif
230			`end`
231
232			`endmodule`

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