cpu/src/rom_b.vhd

   1 --   `Deep Thought', a softcore CPU implemented on a FPGA
   2 --
   3 --  Copyright (C) 2010 Markus Hofstaetter <markus.manrow@gmx.at>
   4 --  Copyright (C) 2010 Martin Perner <e0725782@student.tuwien.ac.at>
   5 --  Copyright (C) 2010 Stefan Rebernig <stefan.rebernig@gmail.com>
   6 --  Copyright (C) 2010 Manfred Schwarz <e0725898@student.tuwien.ac.at>
   7 --  Copyright (C) 2010 Bernhard Urban <lewurm@gmail.com>
   8 --
   9 --  This program is free software: you can redistribute it and/or modify
  10 --  it under the terms of the GNU General Public License as published by
  11 --  the Free Software Foundation, either version 3 of the License, or
  12 --  (at your option) any later version.
  13 --
  14 --  This program is distributed in the hope that it will be useful,
  15 --  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 --  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 --  GNU General Public License for more details.
  18 --
  19 --  You should have received a copy of the GNU General Public License
  20 --  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 library ieee;
  23
  24 use IEEE.std_logic_1164.all;
  25 use IEEE.numeric_std.all;
  26
  27 use work.mem_pkg.all;
  28
  29 architecture behaviour of rom is
  30
  31         signal vsim_bug : std_logic_vector(31 downto 0);
  32
  33 begin
  34         process(clk)
  35         begin
  36                 if rising_edge(clk) then
  37 --               data_out <= ram(to_integer(UNSIGNED(rd_addr)));
  38
  39
  40         --case rrrr_addr(10 downto 0) is
  41                         case vsim_bug(6 downto 0) is
  42         -- fibonacci
  43 --                              when "00000000000" => data_out <= "11101101000000000000000000000000"; --
  44 --                              when "00000000001" => data_out <= "11101101001000000000000000000000"; --
  45 --                              when "00000000010" => data_out <= "11100111101000000000000000000000"; --
  46 --
  47 --                              when "00000000011" => data_out <= "11100001000000000000000000100001"; --
  48 --                              when "00000000100" => data_out <= "11101100100000000000001100000000"; --
  49 --                              when "00000000101" => data_out <= "00001011011111111111111010000011"; --
  50 --
  51 --                              when "00000000110" => data_out <= "11101101000000000000000000001000"; --
  52 --                              when "00000000111" => data_out <= "11100111100000000000000000001111"; --
  53 --                              when "00000001000" => data_out <= "11100111100000000000000000010011"; -- --
  54 --
  55 --
  56 --                              when "00000001001" => data_out <= x"ed080048"; --x"ed080048"; --
  57 --                              when "00000001010" => data_out <= x"ed500080"; --
  58 --                              when "00000001011" => data_out <= x"fd500002"; --
  59 --                              when "00000001100" => data_out <= x"eb000107";
  60 --                              when "00000001101" => data_out <= "11101011000000000000011010000010"; --"11101011000000000000000000000010";
  61 --
  62 --                              when "00000001110" => data_out <= x"e5088800";
  63 --                              when "00000001111" => data_out <= x"e0150800";
  64 --                              when "00000010000" => data_out <= x"e7010000";
  65 --                              when "00000010001" => data_out <= x"ec800000";
  66 --                              when "00000010010" => data_out <= x"0b000008";
  67 --                              when "00000010011" => data_out <= x"e1910020";
  68 --                              when "00000010100" => data_out <= x"eb7ffe07";
  69 --                              when "00000010101" => data_out <= x"e7197ffc";
  70 --                              when "00000010110" => data_out <= x"e0018000";
  71 --
  72 --                              when "00000010111" => data_out <= x"e1110020";
  73 --                              when "00000011000" => data_out <= x"e7810000";
  74 --                              when "00000011001" => data_out <= x"eb00000a";
  75 --
  76 --
  77 --                              when "00000011010" => data_out <= x"ed290080";
  78 --                              when "00000011011" => data_out <= x"e1080000";
  79 --
  80 --                              when "00000011100" => data_out <= x"e78a8000";
  81 --
  82 --                              when "00000011101" => data_out <= x"ed510058";
  83 --                              when "00000011110" => data_out <= x"e7850000";
  84
  85                         -- uart echo
  86
  87 --1;00000000;ed010058;ldi r0, 0x200B;;
  88 --1;00000004;ed090060;ldi r1, 0x200C;;
  89 --1;00000008;ed110080;ldi r2, 0x2010;;
  90 --1;0000000c;e7188000;ldw r3, 0(r1);;
  91 --1;00000010;ec1a0000;cmp r3, r4;;
  92 --1;00000014;1b7ffd81;breq 0;;
  93 --1;00000018;e7980000;stw r3, 0(r0);;
  94 --1;0000001c;e7990000;stw r3, 0(r2);;
  95 --1;00000020;e1218000;addi r4, r3, 0;;
  96 --1;00000024;eb7ffb81;br 0;;
  97
  98 --                              when "0000000" => data_out <= x"ed010058";
  99 --                              when "0000001" => data_out <= x"ed090060";
 100 --                              when "0000010" => data_out <= x"ed110080"; --x"e7188000";  f
 101 --                              when "0000011" => data_out <= x"e7188000"; --x"ec1a0000";
 102 --                              when "0000100" => data_out <= x"ec1a0000";
 103 --                              when "0000101" => data_out <= x"1b7ffe01";
 104 --                              when "0000110" => data_out <= x"e7990000"; -- f
 105 --                              when "0000111" => data_out <= x"e7980000";
 106 --                              when "0001000" => data_out <= x"e1218000";
 107 --                              when "0001001" => data_out <= x"eb7ffb81";
 108
 109 --1;00000000;ed010058;ldi r0, 0x200B;;;
 110 --1;00000004;ed090060;ldi r1, 0x200C;;;
 111 --1;00000008;ed110080;ldi r2, 0x2010;;;
 112 --1;0000000c;ed390078;ldi r7, 0x200F;;;
 113 --1;00000010;ed480012;ldih r9, 0x0002;;;
 114 --1;00000014;e7438000;ldw r8, 0(r7);;;
 115 --1;00000018;e254c000;and r10, r9, r8;;;
 116 --1;0000001c;07188000;ldwnz r3, 0(r1);;;
 117 --1;00000020;07980000;stwnz r3, 0(r0);;;
 118 --1;00000024;07990000;stwnz r3, 0(r2);;;
 119 --1;00000028;eb7ffb01;br 0;;;
 120
 121 --uart test:
 122
 123 --                              when "0000000" => data_out <= x"ed010058";
 124 --                              when "0000001" => data_out <= x"ed090060";
 125 --                              when "0000010" => data_out <= x"ed110080"; --x"e7188000";  f
 126 --                              when "0000011" => data_out <= x"ed390000"; --x"ec1a0000";
 127 --                              when "0000100" => data_out <= x"ed480012";
 128 --                              when "0000101" => data_out <= x"e7438000";
 129 --                              when "0000110" => data_out <= x"e254c000"; -- f
 130 --                              when "0000111" => data_out <= x"07188000";
 131 --                              when "0001000" => data_out <= x"07980000";
 132 --                              when "0001001" => data_out <= x"07990000";
 133 --                              when "0001010" => data_out <= x"eb7ffb81";
 134
 135 -------------------------------------------
 136
 137 --                              when "00000000000" => data_out <= x"ed000000";
 138 --                              when "00000000001" => data_out <= x"ed080008";
 139 --                              when "00000000010" => data_out <= x"e9880000"; --x"e7188000";  f
 140 --                              when "00000000011" => data_out <= x"e5088400"; --x"ec1a0000";
 141 --                              when "00000000100" => data_out <= x"e9880001";
 142 --                              when "00000000101" => data_out <= x"e7180000";
 143 --                              when "00000000110" => data_out <= x"e9200001"; -- f
 144 --                              when "00000000111" => data_out <= x"e7a00004";
 145 --                              when "00000001000" => data_out <= x"e7280004";
 146 --                      --      when "00000001001" => data_out <= x"eb7ffb81";
 147         when "0000000" => data_out <= x"eb000183"; -- br+ main
 148         when "0000001" => data_out <= x"eb000103"; -- br+ main
 149         when "0000010" => data_out <= x"eb000008"; -- ret
 150         when "0000011" => data_out <= x"ed510000"; -- ldi r10, UART_BASE@lo
 151         when "0000100" => data_out <= x"ed500002"; -- ldih r10, UART_BASE@hi
 152         when "0000101" => data_out <= x"ed590180"; -- ldi r11, PBASE@lo
 153         when "0000110" => data_out <= x"ed580002"; -- ldih r11, PBASE@hi
 154         when "0000111" => data_out <= x"eb000985"; -- call recv_byte
 155         when "0001000" => data_out <= x"e4088800"; -- xor r1, r1, r1
 156         when "0001001" => data_out <= x"ec800240"; -- cmpi r0, 0x48
 157         when "0001010" => data_out <= x"1b001703"; -- breq+ bt_H
 158         when "0001011" => data_out <= x"eb7ffe01"; -- br poll
 159         when "0001100" => data_out <= x"e71d0000"; -- ldw r3, UART_STATUS(r10)
 160         when "0001101" => data_out <= x"e2980008"; -- andx r3, UART_TRANS_EMPTY
 161         when "0001110" => data_out <= x"0b7fff03"; -- brnz+ send_byte
 162         when "0001111" => data_out <= x"e78d0008"; -- stw r1, UART_TRANS(r10)
 163         when "0010000" => data_out <= x"eb000008"; -- ret
 164         when "0010001" => data_out <= x"e5008008"; -- lrs r0, r1, 0
 165         when "0010010" => data_out <= x"eb7ffd05"; -- call send_byte
 166         when "0010011" => data_out <= x"e500a008"; -- lrs r0, r1, 8
 167         when "0010100" => data_out <= x"eb7ffc05"; -- call send_byte
 168         when "0010101" => data_out <= x"e500c008"; -- lrs r0, r1, 16
 169         when "0010110" => data_out <= x"eb7ffb05"; -- call send_byte
 170         when "0010111" => data_out <= x"e500e008"; -- lrs r0, r1, 24
 171         when "0011000" => data_out <= x"eb7ffa05"; -- call send_byte
 172         when "0011001" => data_out <= x"eb000008"; -- ret
 173         when "0011010" => data_out <= x"e71d0000"; -- ldw r3, UART_STATUS(r10)
 174         when "0011011" => data_out <= x"e2980010"; -- andx r3, UART_RECV_NEW
 175         when "0011100" => data_out <= x"1b7fff03"; -- brzs+ recv_byte
 176         when "0011101" => data_out <= x"e4000000"; -- xor r0, r0, r0
 177         when "0011110" => data_out <= x"e705000c"; -- ldw r0, UART_RECV(r10)
 178         when "0011111" => data_out <= x"eb000008"; -- ret
 179         when "0100000" => data_out <= x"e4088800"; -- xor r1, r1, r1
 180         when "0100001" => data_out <= x"eb7ffc85"; -- call recv_byte
 181         when "0100010" => data_out <= x"e3080800"; -- or r1, r0, r1
 182         when "0100011" => data_out <= x"eb7ffb85"; -- call recv_byte
 183         when "0100100" => data_out <= x"e508a000"; -- lls r1, r1, 8
 184         when "0100101" => data_out <= x"e3080800"; -- or r1, r0, r1
 185         when "0100110" => data_out <= x"eb7ffa05"; -- call recv_byte
 186         when "0100111" => data_out <= x"e508a000"; -- lls r1, r1, 8
 187         when "0101000" => data_out <= x"e3080800"; -- or r1, r0, r1
 188         when "0101001" => data_out <= x"eb7ff885"; -- call recv_byte
 189         when "0101010" => data_out <= x"e508a000"; -- lls r1, r1, 8
 190         when "0101011" => data_out <= x"e3000800"; -- or r0, r0, r1
 191         when "0101100" => data_out <= x"e4088800"; -- xor r1, r1, r1
 192         when "0101101" => data_out <= x"eb000008"; -- ret
 193         when "0101110" => data_out <= x"eb7ff605"; -- call recv_byte
 194         when "0101111" => data_out <= x"e4088800"; -- xor r1, r1, r1
 195         when "0110000" => data_out <= x"ec8002b8"; -- cmpi r0, 0x57
 196         when "0110001" => data_out <= x"1b000501"; -- breq- bt_W
 197         when "0110010" => data_out <= x"ec800288"; -- cmpi r0, 0x51
 198         when "0110011" => data_out <= x"1b000881"; -- breq- bt_Q
 199         when "0110100" => data_out <= x"ec8002a0"; -- cmpi r0, 0x54
 200         when "0110101" => data_out <= x"1b000c01"; -- breq- bt_T
 201         when "0110110" => data_out <= x"ec800250"; -- cmpi r0, 0x4a
 202         when "0110111" => data_out <= x"1b000e81"; -- breq- bt_J
 203         when "0111000" => data_out <= x"ed080278"; -- ldi r1, 0x4f
 204         when "0111001" => data_out <= x"eb7fe985"; -- call send_byte
 205         when "0111010" => data_out <= x"eb7ffa01"; -- br bootrom
 206         when "0111011" => data_out <= x"ed0802b8"; -- ldi r1, 0x57
 207         when "0111100" => data_out <= x"eb7fe805"; -- call send_byte
 208         when "0111101" => data_out <= x"eb7ff185"; -- call recv_word
 209         when "0111110" => data_out <= x"e7858004"; -- stw r0, PADDR(r11)
 210         when "0111111" => data_out <= x"eb7ff085"; -- call recv_word
 211         when "1000000" => data_out <= x"e7858008"; -- stw r0, PDATA(r11)
 212         when "1000001" => data_out <= x"ed080220"; -- ldi r1, 0x44
 213         when "1000010" => data_out <= x"eb7fe505"; -- call send_byte
 214         when "1000011" => data_out <= x"eb7ff581"; -- br bootrom
 215         when "1000100" => data_out <= x"ed080288"; -- ldi r1, 0x51
 216         when "1000101" => data_out <= x"eb7fe385"; -- call send_byte
 217         when "1000110" => data_out <= x"eb7fed05"; -- call recv_word
 218         when "1000111" => data_out <= x"e1300000"; -- addi r6, r0, 0
 219         when "1001000" => data_out <= x"eb7fec05"; -- call recv_word
 220         when "1001001" => data_out <= x"e7830000"; -- stw r0, 0(r6)
 221         when "1001010" => data_out <= x"ed080208"; -- ldi r1, 0x41
 222         when "1001011" => data_out <= x"eb7fe085"; -- call send_byte
 223         when "1001100" => data_out <= x"eb7ff101"; -- br bootrom
 224         when "1001101" => data_out <= x"eb7fe985"; -- call recv_word
 225         when "1001110" => data_out <= x"e1100000"; -- mov r2, r0
 226         when "1001111" => data_out <= x"ed080238"; -- ldi r1, 0x47
 227         when "1010000" => data_out <= x"eb7fde05"; -- call send_byte
 228         when "1010001" => data_out <= x"e7090000"; -- ldw r1, 0(r2)
 229         when "1010010" => data_out <= x"eb7fdf85"; -- call send_word
 230         when "1010011" => data_out <= x"eb7fed81"; -- br bootrom
 231         -- just nop until rom end!
 232         when others => data_out <= x"fd000000";
 233                         end case;
 234                 end if;
 235         end process;
 236
 237         vsim_bug(6 downto 0) <= rd_addr;
 238         vsim_bug(31 downto 7) <= (others => '0');
 239 end architecture behaviour;