3 use IEEE.std_logic_1164.all;
4 use IEEE.numeric_std.all;
8 architecture behaviour of r_w_ram is
10 subtype RAM_ENTRY_TYPE is std_logic_vector(DATA_WIDTH -1 downto 0);
11 type RAM_TYPE is array (0 to (2**ADDR_WIDTH)-1) of RAM_ENTRY_TYPE;
13 -- r0 = 0, r1 = 1, r2 = 3, r3 = A
15 signal ram : RAM_TYPE := (
16 --8 => "11100111100010000000000000000000", --stw
17 -- 0 => "11101101000000000000000000000000", --ldi
18 -- 1 => "11101101001000000000000000000000", --ldi
19 -- 2 => "11100111101000000000000000000000", --stw
20 -- 3 => "11100001000000000000000000100001",
21 -- 4 => "11101100100000000000001100000000",
22 -- 5 => "00001011011111111111111010000011",
23 -- 6 => "11101101000000000000000000001000",
24 -- 7 => "11100111100000000000000000001111",
25 -- 8 => "11100111100000000000000000010011",
27 -- 9 => x"ed080048", --;ldi r1, 9;;
28 -- 10 => x"ed500080", --;ldil r10, list@lo ;; global pointer
29 -- 11 => x"fd500002", --;ldih r10, list@hi;;
30 -- 12 => x"eb000107", --;call+ fibcall;;
31 --13 => x"eb7ffe03", --;br+ main;;
32 -- 13 => "11101011000000000000000000000010", -- endless loop --2; fib(n) {
33 --2; if (list[n] > 0) {
37 --2; list[n] = a + list[n-2]
41 --2;update counter for aligned access
42 -- 14 => x"e5088800", --;lls r1, r1, 2 ;; *4
43 --2;calculate adress of top element
44 -- 15 => x"e0150800", --;add r2, r10, r1;;
47 -- 16 => x"e7010000", --;ldw r0, 0(r2);;
49 -- 17 => x"ec800000", --;cmpi r0, 0;;
51 -- 18 => x"0b000008", --;retnz-;;
52 --2;decrement adress for next lopp
53 -- 19 => x"e1910020", --;subi r2, r2, 4;;
54 --2;iterative call for n-1 element
55 -- 20 => x"eb7ffe07", --;call+ fibmem;;
57 -- 21 => x"e7197ffc", --;ldw r3, 0-4(r2);;
58 --2;add n-1 and n-2 element
59 -- 22 => x"e0018000", --;add r0, r3, r0;;
60 --2;increment address for n element
61 --2;is needed because after return
62 --2;we need r2 to be set to the address
64 -- 23 => x"e1110020", --;addi r2, r2, 4;;
66 -- 24 => x"e7810000", --;stw r0, 0(r2);;
67 -- 25 => x"eb00000a", --;ret+;;
69 -- 1 1 2 3 5 8 13 21 34 55
72 others => x"F0000000");
74 -- signal ram : RAM_TYPE := ( 0 => "11101101000000000000000000000000", -- r0 = 0
76 -- 1 => "11101101000010000000000000111000", -- r1 = 7
77 -- 2 => "11101101000100000000000000101000", -- r2 = 5
78 -- 3 => "11101101000110000000000000100000", -- r3 = 4
79 -- 4 => "11100000001000010001100000000000", -- r4 = r2 + r3
80 -- 5 => "11100010001010100000100000000000", -- r5 = r4 and r1
82 -- 6 => "11100001000000000000000000001000", -- r0 = r0 + 1
83 -- 7 => "11101100100000000000000000011000", -- cmpi r0 , 2
85 -- 8 => "00001011011111111111110010000111", -- jump -7
86 -- 9 => "11101011000000000000000010000010", -- jump +1
87 -- --10 => "11101011000000000000000010000010", -- jump +1
89 -- 10 => "11100111101010100000000000000001", -- stw r5,r4,1
90 -- 11 => "11101100001000100000000000000000", -- cmp r4 , r4 => 2-2 => 1001
92 -- 12 => "11101011000000000000000000000010", -- jump +0
97 -- others => x"F0000000");
99 -- signal ram : RAM_TYPE := ( 0 => "11100000000100001000000000000000", --add r2, r1, r0 => r2 = 1
100 -- 1 => "11100000000110001000000000000000", --add r3, r1, r0 => r3 = 1
101 -- 2 => "11100000001000011001000000000000", --add r4, r3, r2 => r4 = 2
102 -- 3 => "11100000000100001000000000000000", --add r2, r1, r0 => r2 = 1
103 -- 4 => "11100000000110001000000000000000", --add r3, r1, r0 => r3 = 1
104 -- 5 => "11100000001000011001000000000000", --add r4, r3, r2 => r4 = 2
105 -- 6 => "11101100000000001000000000000000", --cmp r0 , r1 => 0-1 => 0100
106 -- 7 => "00000000001010101010000000000001", --addnqd r5, r5, r4 => r5 = 2
107 -- 8 => "00000000001010101010000000000000", --addnq r5, r5, r4 => r5 = 4
108 -- 9 => "11101100001000100000000000000000", --cmp r4 , r4 => 2-2 => 1001
109 -- 10 => "00000001001100001000000001010000", --addinq r6, r1, 0xA => nix
110 -- 11 => "00010001001100001000000001010000", --addieq r6, r1, 0xA => r6 = 0xB
111 -- 12 => "00010001101100110000000001010000", --subieq r6, r5, 0xA => r6 = 1
112 -- 13 => "11100000000100001000000000000000", --add r2, r1, r0 => r2 = 1
113 -- 14 => "11100010000100001000000000000000", --and r2, r1, r0 => r2 = 0
114 -- 15 => "11101100000000001000000000000000", --cmp r0 , r1 => 0-1 => 0100
115 -- 16 => "10000000001010101010000000000001", --addabd r5, r5, r4 => r5 = 6
116 -- 17 => "10110011101110001000010000110001", --orxltd r7, 1086 => r7 = 1086
117 -- 18 => "10110101001110001000010000000001", --shiftltd r7, r1, 1 => r7 = 2
118 -- 19 => "01010101001110001000100000000001", --shiftltd r7, r1, 2 => r7 = 4
119 -- others => x"F0000000");
125 if rising_edge(clk) then
126 -- data_out <= ram(to_integer(UNSIGNED(rd_addr)));
128 when "00000000000" => data_out <= x"ed2802d0"; -- ldi r5, 0x5a;;
129 when "00000000100" => data_out <= x"ed008058"; -- ldi r0, 0x100b;;
130 when "00000001000" => data_out <= x"e7a80000"; -- stw r5, 0(r0);;
131 when others => data_out <= x"07a80000";
135 ram(to_integer(UNSIGNED(wr_addr))) <= data_in;
139 end architecture behaviour;