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  1. /*****
  2. *
  3. * CSC258, Fall 2013
  4. * Conway's Game of Life
  5. * By: Spencer Elliott (999992539), Dean Britto (999895298)
  6. *
  7. *****/
  8.  
  9. /**
  10. * Main module to be instantiated in a project that uses a VGA controller
  11. */
  12. module game_of_life(KEY, CLOCK_50, x, y, r, g, b);
  13. // KEYs are used to reset and cycle through presets
  14. input [3:0] KEY;
  15. // CLOCK_50 is used as a seed for the slower clock which controls the speed of Life generations
  16. input CLOCK_50;
  17. // x and y are pixel coordinates on the 640-by-480 VGA display
  18. input [9:0] x, y;
  19. // r, g, and b represent the colour of each pixel on the VGA display
  20. output [9:0] r, g, b;
  21.  
  22. /**
  23. * cells determines whether a square is on or off.
  24. * For example,
  25. * cells[4] == 1 means the square at the 5th column, 1st row is on.
  26. * cells[454] == 1 means the square at the 7th column (454 % 64 + 1 == 7), 9th row (454 / 48 == 9) is on.
  27. */
  28. wire [0:64*48-1] cells;
  29. // cells_reset_state and cells_preset represent the state to
  30. // return all cells to when the reset KEY is pressed
  31. wire [0:64*48-1] cells_reset_state;
  32. reg [0:64*48-1] cells_preset;
  33.  
  34. reg [3:0] preset_state;
  35.  
  36. initial begin
  37. // When the program is loaded, start with the first preset
  38. cells_preset[0 :64*0+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  39. cells_preset[64*1 :64*1+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  40. cells_preset[64*2 :64*2+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  41. cells_preset[64*3 :64*3+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  42. cells_preset[64*4 :64*4+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  43. cells_preset[64*5 :64*5+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  44. cells_preset[64*6 :64*6+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  45. cells_preset[64*7 :64*7+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  46. cells_preset[64*8 :64*8+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  47. cells_preset[64*9 :64*9+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  48. cells_preset[64*10:64*10+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  49. cells_preset[64*11:64*11+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  50. cells_preset[64*12:64*12+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  51. cells_preset[64*13:64*13+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  52. cells_preset[64*14:64*14+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  53. cells_preset[64*15:64*15+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  54. cells_preset[64*16:64*16+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  55. cells_preset[64*17:64*17+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  56. cells_preset[64*18:64*18+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  57. cells_preset[64*19:64*19+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  58. cells_preset[64*20:64*20+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  59. cells_preset[64*21:64*21+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  60. cells_preset[64*22:64*22+63] <= 64'b0000000000000000000000000110010000000000000000000000000000000000;
  61. cells_preset[64*23:64*23+63] <= 64'b0000000000000000000000000100010000000000000000000000000000000000;
  62. cells_preset[64*24:64*24+63] <= 64'b0000000000000000000000000100110000000000000000000000000000000000;
  63. cells_preset[64*25:64*25+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  64. cells_preset[64*26:64*26+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  65. cells_preset[64*27:64*27+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  66. cells_preset[64*28:64*28+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  67. cells_preset[64*29:64*29+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  68. cells_preset[64*30:64*30+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  69. cells_preset[64*31:64*31+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  70. cells_preset[64*32:64*32+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  71. cells_preset[64*33:64*33+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  72. cells_preset[64*34:64*34+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  73. cells_preset[64*35:64*35+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  74. cells_preset[64*36:64*36+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  75. cells_preset[64*37:64*37+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  76. cells_preset[64*38:64*38+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  77. cells_preset[64*39:64*39+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  78. cells_preset[64*40:64*40+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  79. cells_preset[64*41:64*41+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  80. cells_preset[64*42:64*42+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  81. cells_preset[64*43:64*43+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  82. cells_preset[64*44:64*44+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  83. cells_preset[64*45:64*45+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  84. cells_preset[64*46:64*46+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  85. cells_preset[64*47:64*47+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  86.  
  87. preset_state <= 2;
  88. end
  89.  
  90. // When KEY[2] is pressed, cycle through presets
  91. always @(posedge KEY[2]) begin
  92. if (preset_state == 1) begin
  93. cells_preset[0 :64*0+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  94. cells_preset[64*1 :64*1+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  95. cells_preset[64*2 :64*2+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  96. cells_preset[64*3 :64*3+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  97. cells_preset[64*4 :64*4+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  98. cells_preset[64*5 :64*5+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  99. cells_preset[64*6 :64*6+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  100. cells_preset[64*7 :64*7+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  101. cells_preset[64*8 :64*8+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  102. cells_preset[64*9 :64*9+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  103. cells_preset[64*10:64*10+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  104. cells_preset[64*11:64*11+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  105. cells_preset[64*12:64*12+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  106. cells_preset[64*13:64*13+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  107. cells_preset[64*14:64*14+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  108. cells_preset[64*15:64*15+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  109. cells_preset[64*16:64*16+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  110. cells_preset[64*17:64*17+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  111. cells_preset[64*18:64*18+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  112. cells_preset[64*19:64*19+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  113. cells_preset[64*20:64*20+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  114. cells_preset[64*21:64*21+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  115. cells_preset[64*22:64*22+63] <= 64'b0000000000000000000000000110010000000000000000000000000000000000;
  116. cells_preset[64*23:64*23+63] <= 64'b0000000000000000000000000100010000000000000000000000000000000000;
  117. cells_preset[64*24:64*24+63] <= 64'b0000000000000000000000000100110000000000000000000000000000000000;
  118. cells_preset[64*25:64*25+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  119. cells_preset[64*26:64*26+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  120. cells_preset[64*27:64*27+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  121. cells_preset[64*28:64*28+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  122. cells_preset[64*29:64*29+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  123. cells_preset[64*30:64*30+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  124. cells_preset[64*31:64*31+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  125. cells_preset[64*32:64*32+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  126. cells_preset[64*33:64*33+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  127. cells_preset[64*34:64*34+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  128. cells_preset[64*35:64*35+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  129. cells_preset[64*36:64*36+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  130. cells_preset[64*37:64*37+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  131. cells_preset[64*38:64*38+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  132. cells_preset[64*39:64*39+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  133. cells_preset[64*40:64*40+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  134. cells_preset[64*41:64*41+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  135. cells_preset[64*42:64*42+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  136. cells_preset[64*43:64*43+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  137. cells_preset[64*44:64*44+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  138. cells_preset[64*45:64*45+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  139. cells_preset[64*46:64*46+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  140. cells_preset[64*47:64*47+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  141.  
  142. preset_state <= 2;
  143. end else if (preset_state == 2) begin
  144. cells_preset[0 :64*0+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  145. cells_preset[64*1 :64*1+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  146. cells_preset[64*2 :64*2+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  147. cells_preset[64*3 :64*3+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  148. cells_preset[64*4 :64*4+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  149. cells_preset[64*5 :64*5+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  150. cells_preset[64*6 :64*6+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  151. cells_preset[64*7 :64*7+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  152. cells_preset[64*8 :64*8+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  153. cells_preset[64*9 :64*9+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  154. cells_preset[64*10:64*10+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  155. cells_preset[64*11:64*11+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  156. cells_preset[64*12:64*12+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  157. cells_preset[64*13:64*13+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  158. cells_preset[64*14:64*14+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  159. cells_preset[64*15:64*15+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  160. cells_preset[64*16:64*16+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  161. cells_preset[64*17:64*17+63] <= 64'b0000000000000001100000000110000000000000000000000000000000000000;
  162. cells_preset[64*18:64*18+63] <= 64'b0000000000000001100000001000000000000000000000000000000000000000;
  163. cells_preset[64*19:64*19+63] <= 64'b0000000000000000000000000001000000000000000000000000000000000000;
  164. cells_preset[64*20:64*20+63] <= 64'b0000000000000000000000011010000000000000000000000000000000000000;
  165. cells_preset[64*21:64*21+63] <= 64'b0000000000000000000000011000000000000000000000000000000000000000;
  166. cells_preset[64*22:64*22+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  167. cells_preset[64*23:64*23+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  168. cells_preset[64*24:64*24+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  169. cells_preset[64*25:64*25+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  170. cells_preset[64*26:64*26+63] <= 64'b0000000000000000000000110000000000000000000000000000000000000000;
  171. cells_preset[64*27:64*27+63] <= 64'b0000000000000000000010110000000000000000000000000000000000000000;
  172. cells_preset[64*28:64*28+63] <= 64'b0000000000000000000100000000000000000000000000000000000000000000;
  173. cells_preset[64*29:64*29+63] <= 64'b0000000000000000000000100000001100000000000000000000000000000000;
  174. cells_preset[64*30:64*30+63] <= 64'b0000000000000000000011000000001100000000000000000000000000000000;
  175. cells_preset[64*31:64*31+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  176. cells_preset[64*32:64*32+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  177. cells_preset[64*33:64*33+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  178. cells_preset[64*34:64*34+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  179. cells_preset[64*35:64*35+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  180. cells_preset[64*36:64*36+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  181. cells_preset[64*37:64*37+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  182. cells_preset[64*38:64*38+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  183. cells_preset[64*39:64*39+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  184. cells_preset[64*40:64*40+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  185. cells_preset[64*41:64*41+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  186. cells_preset[64*42:64*42+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  187. cells_preset[64*43:64*43+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  188. cells_preset[64*44:64*44+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  189. cells_preset[64*45:64*45+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  190. cells_preset[64*46:64*46+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  191. cells_preset[64*47:64*47+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  192.  
  193. preset_state <= 3;
  194. end else if (preset_state == 3) begin
  195. cells_preset[0 :64*0+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  196. cells_preset[64*1 :64*1+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  197. cells_preset[64*2 :64*2+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  198. cells_preset[64*3 :64*3+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  199. cells_preset[64*4 :64*4+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  200. cells_preset[64*5 :64*5+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  201. cells_preset[64*6 :64*6+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  202. cells_preset[64*7 :64*7+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  203. cells_preset[64*8 :64*8+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  204. cells_preset[64*9 :64*9+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  205. cells_preset[64*10:64*10+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  206. cells_preset[64*11:64*11+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  207. cells_preset[64*12:64*12+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  208. cells_preset[64*13:64*13+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  209. cells_preset[64*14:64*14+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  210. cells_preset[64*15:64*15+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  211. cells_preset[64*16:64*16+63] <= 64'b0000000000000000000011000000110000000000000000000000000000000000;
  212. cells_preset[64*17:64*17+63] <= 64'b0000000000000000000100100001001000000000000000000000000000000000;
  213. cells_preset[64*18:64*18+63] <= 64'b0000000000000000000101000000101000000000000000000000000000000000;
  214. cells_preset[64*19:64*19+63] <= 64'b0000000000000000011001110011100110000000000000000000000000000000;
  215. cells_preset[64*20:64*20+63] <= 64'b0000000000000000100000010010000001000000000000000000000000000000;
  216. cells_preset[64*21:64*21+63] <= 64'b0000000000000000101100000000001101000000000000000000000000000000;
  217. cells_preset[64*22:64*22+63] <= 64'b0000000000000000010100000000001010000000000000000000000000000000;
  218. cells_preset[64*23:64*23+63] <= 64'b0000000000000000000110001100011000000000000000000000000000000000;
  219. cells_preset[64*24:64*24+63] <= 64'b0000000000000000000000010100000000000000000000000000000000000000;
  220. cells_preset[64*25:64*25+63] <= 64'b0000000000000000000000011000000000000000000000000000000000000000;
  221. cells_preset[64*26:64*26+63] <= 64'b0000000000000000000110000000011000000000000000000000000000000000;
  222. cells_preset[64*27:64*27+63] <= 64'b0000000000000000010100000000001010000000000000000000000000000000;
  223. cells_preset[64*28:64*28+63] <= 64'b0000000000000000101100000000001101000000000000000000000000000000;
  224. cells_preset[64*29:64*29+63] <= 64'b0000000000000000100000010010000001000000000000000000000000000000;
  225. cells_preset[64*30:64*30+63] <= 64'b0000000000000000011001110011100110000000000000000000000000000000;
  226. cells_preset[64*31:64*31+63] <= 64'b0000000000000000000101000000101000000000000000000000000000000000;
  227. cells_preset[64*32:64*32+63] <= 64'b0000000000000000000100100001001000000000000000000000000000000000;
  228. cells_preset[64*33:64*33+63] <= 64'b0000000000000000000011000000110000000000000000000000000000000000;
  229. cells_preset[64*34:64*34+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  230. cells_preset[64*35:64*35+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  231. cells_preset[64*36:64*36+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  232. cells_preset[64*37:64*37+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  233. cells_preset[64*38:64*38+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  234. cells_preset[64*39:64*39+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  235. cells_preset[64*40:64*40+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  236. cells_preset[64*41:64*41+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  237. cells_preset[64*42:64*42+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  238. cells_preset[64*43:64*43+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  239. cells_preset[64*44:64*44+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  240. cells_preset[64*45:64*45+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  241. cells_preset[64*46:64*46+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  242. cells_preset[64*47:64*47+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  243.  
  244. preset_state <= 4;
  245. end else if (preset_state == 4) begin
  246. cells_preset[0 :64*0+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  247. cells_preset[64*1 :64*1+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  248. cells_preset[64*2 :64*2+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  249. cells_preset[64*3 :64*3+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  250. cells_preset[64*4 :64*4+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  251. cells_preset[64*5 :64*5+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  252. cells_preset[64*6 :64*6+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  253. cells_preset[64*7 :64*7+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  254. cells_preset[64*8 :64*8+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  255. cells_preset[64*9 :64*9+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  256. cells_preset[64*10:64*10+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  257. cells_preset[64*11:64*11+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  258. cells_preset[64*12:64*12+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  259. cells_preset[64*13:64*13+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  260. cells_preset[64*14:64*14+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  261. cells_preset[64*15:64*15+63] <= 64'b0000000000000000000000100000000000000000000000000000000000000000;
  262. cells_preset[64*16:64*16+63] <= 64'b0000000000000000000001110000000000000000000000000000000000000000;
  263. cells_preset[64*17:64*17+63] <= 64'b0000000000000000000011010000010000000000000000000000000000000000;
  264. cells_preset[64*18:64*18+63] <= 64'b0000000000000000000011100000111000000000000000000000000000000000;
  265. cells_preset[64*19:64*19+63] <= 64'b0000000000000000000001100001001100011100000000000000000000000000;
  266. cells_preset[64*20:64*20+63] <= 64'b0000000000000000000000000001110000100100000000000000000000000000;
  267. cells_preset[64*21:64*21+63] <= 64'b0000000000000000000000000000000000000100000000000000000000000000;
  268. cells_preset[64*22:64*22+63] <= 64'b0000000000000000000000000000000000000100000000000000000000000000;
  269. cells_preset[64*23:64*23+63] <= 64'b0000000000000000000000000000000000001000000000000000000000000000;
  270. cells_preset[64*24:64*24+63] <= 64'b0000000000000000000001110000000000000000000000000000000000000000;
  271. cells_preset[64*25:64*25+63] <= 64'b0000000000000000000001001000000000000000000000000000000000000000;
  272. cells_preset[64*26:64*26+63] <= 64'b0000000000000000000001000000000000000000000000000000000000000000;
  273. cells_preset[64*27:64*27+63] <= 64'b0000000000000000000001000000000000000000000000000000000000000000;
  274. cells_preset[64*28:64*28+63] <= 64'b0000000000000000000000100000000000000000000000000000000000000000;
  275. cells_preset[64*29:64*29+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  276. cells_preset[64*30:64*30+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  277. cells_preset[64*31:64*31+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  278. cells_preset[64*32:64*32+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  279. cells_preset[64*33:64*33+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  280. cells_preset[64*34:64*34+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  281. cells_preset[64*35:64*35+63] <= 64'b0000000000000000000111000000000000000000000000000000000000000000;
  282. cells_preset[64*36:64*36+63] <= 64'b0000000000000000000100100000000000010000000000000000000000000000;
  283. cells_preset[64*37:64*37+63] <= 64'b0000000000000000000100000000000000111000000000000000000000000000;
  284. cells_preset[64*38:64*38+63] <= 64'b0000000000000000000100000000000001101000000000000000000000000000;
  285. cells_preset[64*39:64*39+63] <= 64'b0000000000000000000100000000000001110000000000000000000000000000;
  286. cells_preset[64*40:64*40+63] <= 64'b0000000000000000000010000000000000110000000000000000000000000000;
  287. cells_preset[64*41:64*41+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  288. cells_preset[64*42:64*42+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  289. cells_preset[64*43:64*43+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  290. cells_preset[64*44:64*44+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  291. cells_preset[64*45:64*45+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  292. cells_preset[64*46:64*46+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  293. cells_preset[64*47:64*47+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  294.  
  295. preset_state <= 5;
  296. end else if (preset_state == 5) begin
  297. cells_preset[0 :64*0+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  298. cells_preset[64*1 :64*1+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  299. cells_preset[64*2 :64*2+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  300. cells_preset[64*3 :64*3+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  301. cells_preset[64*4 :64*4+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  302. cells_preset[64*5 :64*5+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  303. cells_preset[64*6 :64*6+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  304. cells_preset[64*7 :64*7+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  305. cells_preset[64*8 :64*8+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  306. cells_preset[64*9 :64*9+63 ] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  307. cells_preset[64*10:64*10+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  308. cells_preset[64*11:64*11+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  309. cells_preset[64*12:64*12+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  310. cells_preset[64*13:64*13+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  311. cells_preset[64*14:64*14+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  312. cells_preset[64*15:64*15+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  313. cells_preset[64*16:64*16+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  314. cells_preset[64*17:64*17+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  315. cells_preset[64*18:64*18+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  316. cells_preset[64*19:64*19+63] <= 64'b0000000000110001100011000110001100011000110001100000000000000000;
  317. cells_preset[64*20:64*20+63] <= 64'b0000000000001100011000110001100011000110001100011000000000000000;
  318. cells_preset[64*21:64*21+63] <= 64'b0000000000001100011000110001100011000110001100011000000000000000;
  319. cells_preset[64*22:64*22+63] <= 64'b0000000000110001100011000110001100011000110001100000000000000000;
  320. cells_preset[64*23:64*23+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  321. cells_preset[64*24:64*24+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  322. cells_preset[64*25:64*25+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  323. cells_preset[64*26:64*26+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  324. cells_preset[64*27:64*27+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  325. cells_preset[64*28:64*28+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  326. cells_preset[64*29:64*29+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  327. cells_preset[64*30:64*30+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  328. cells_preset[64*31:64*31+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  329. cells_preset[64*32:64*32+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  330. cells_preset[64*33:64*33+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  331. cells_preset[64*34:64*34+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  332. cells_preset[64*35:64*35+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  333. cells_preset[64*36:64*36+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  334. cells_preset[64*37:64*37+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  335. cells_preset[64*38:64*38+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  336. cells_preset[64*39:64*39+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  337. cells_preset[64*40:64*40+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  338. cells_preset[64*41:64*41+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  339. cells_preset[64*42:64*42+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  340. cells_preset[64*43:64*43+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  341. cells_preset[64*44:64*44+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  342. cells_preset[64*45:64*45+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  343. cells_preset[64*46:64*46+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  344. cells_preset[64*47:64*47+63] <= 64'b0000000000000000000000000000000000000000000000000000000000000000;
  345.  
  346. preset_state <= 1;
  347. end
  348.  
  349. end
  350.  
  351. // The value of cells_reset_state is the same as the current value of cells_preset
  352. assign cells_reset_state = cells_preset;
  353.  
  354. // Create a clock to control the speed of generations
  355. wire Clk;
  356. clock(Clk, CLOCK_50);
  357.  
  358. /**
  359. * Assign neighbours for each cell depending on the cell's location.
  360. * Cells on the edges and corners of the grid must be dealt with separately since
  361. * their neighbours are not directly adjacent.
  362. */
  363. genvar i;
  364. generate
  365. for (i = 0; i < 64 * 48; i = i + 1) begin : CELLS
  366. wire [7:0] neighbours;
  367. if (i == 0) begin
  368. // Top-left square
  369. assign neighbours[0] = cells[64*48 - 1];
  370. assign neighbours[1] = cells[64*48 - 64];
  371. assign neighbours[2] = cells[64*48 - 64 + 1];
  372. assign neighbours[3] = cells[i + 64 - 1];
  373. assign neighbours[4] = cells[i + 1];
  374. assign neighbours[5] = cells[64 + 64 - 1];
  375. assign neighbours[6] = cells[64];
  376. assign neighbours[7] = cells[64 + 1];
  377. end else if (i == 63) begin
  378. // Top-right square
  379. assign neighbours[0] = cells[64*48 - 1 - 1];
  380. assign neighbours[1] = cells[64*48 - 1];
  381. assign neighbours[2] = cells[64*48 - 64];
  382. assign neighbours[3] = cells[i - 1];
  383. assign neighbours[4] = cells[0];
  384. assign neighbours[5] = cells[i + 64 - 1];
  385. assign neighbours[6] = cells[i + 64];
  386. assign neighbours[7] = cells[i + 1];
  387. end else if (i == 64*48 - 64) begin
  388. // Bottom-left square
  389. assign neighbours[0] = cells[i - 1];
  390. assign neighbours[1] = cells[i - 64];
  391. assign neighbours[2] = cells[i - 64 + 1];
  392. assign neighbours[3] = cells[i + 64 - 1];
  393. assign neighbours[4] = cells[i + 1];
  394. assign neighbours[5] = cells[0 + 64 - 1];
  395. assign neighbours[6] = cells[0];
  396. assign neighbours[7] = cells[0 + 1];
  397. end else if (i == 64*48 - 1) begin
  398. // Bottom-right square
  399. assign neighbours[0] = cells[i - 64 - 1];
  400. assign neighbours[1] = cells[i - 64];
  401. assign neighbours[2] = cells[i - 64 - 64 + 1];
  402. assign neighbours[3] = cells[i - 1];
  403. assign neighbours[4] = cells[i - 64 + 1];
  404. assign neighbours[5] = cells[0 + 64 - 1 - 1];
  405. assign neighbours[6] = cells[0 + 64 - 1];
  406. assign neighbours[7] = cells[0];
  407. end else if (i < 63) begin
  408. // Top row
  409. assign neighbours[0] = cells[64*48 - 64 + i - 1];
  410. assign neighbours[1] = cells[64*48 - 64 + i];
  411. assign neighbours[2] = cells[64*48 - 64 + i + 1];
  412. assign neighbours[3] = cells[i - 1];
  413. assign neighbours[4] = cells[i + 1];
  414. assign neighbours[5] = cells[i + 64 - 1];
  415. assign neighbours[6] = cells[i + 64];
  416. assign neighbours[7] = cells[i + 64 + 1];
  417. end else if (i > 64*48 - 64) begin
  418. // Bottom row
  419. assign neighbours[0] = cells[i - 64 - 1];
  420. assign neighbours[1] = cells[i - 64];
  421. assign neighbours[2] = cells[i - 64 + 1];
  422. assign neighbours[3] = cells[i - 1];
  423. assign neighbours[4] = cells[i + 1];
  424. assign neighbours[5] = cells[0 + i - 1];
  425. assign neighbours[6] = cells[0 + i];
  426. assign neighbours[7] = cells[0 + i + 1];
  427. end else if (i % 64 == 0) begin
  428. // Leftmost column
  429. assign neighbours[0] = cells[i - 1];
  430. assign neighbours[1] = cells[i - 64];
  431. assign neighbours[2] = cells[i - 64 + 1];
  432. assign neighbours[3] = cells[i + 64 - 1];
  433. assign neighbours[4] = cells[i + 1];
  434. assign neighbours[5] = cells[i + 64 + 64 - 1];
  435. assign neighbours[6] = cells[i + 64];
  436. assign neighbours[7] = cells[i + 64 + 1];
  437. end else if ((i + 1) % 64 == 0) begin
  438. // Rightmost column
  439. assign neighbours[0] = cells[i - 64 - 1];
  440. assign neighbours[1] = cells[i - 64];
  441. assign neighbours[2] = cells[i - 64 - 64 + 1];
  442. assign neighbours[3] = cells[i - 1];
  443. assign neighbours[4] = cells[i - 64 + 1];
  444. assign neighbours[5] = cells[i + 64 - 1];
  445. assign neighbours[6] = cells[i + 64];
  446. assign neighbours[7] = cells[i + 1];
  447. end else begin
  448. // Middle squares
  449. assign neighbours[0] = cells[i - 64 - 1];
  450. assign neighbours[1] = cells[i - 64];
  451. assign neighbours[2] = cells[i - 64 + 1];
  452. assign neighbours[3] = cells[i - 1];
  453. assign neighbours[4] = cells[i + 1];
  454. assign neighbours[5] = cells[i + 64 - 1];
  455. assign neighbours[6] = cells[i + 64];
  456. assign neighbours[7] = cells[i + 64 + 1];
  457. end
  458. // Create the module for the cell
  459. life_cell(neighbours, Clk, KEY[2], cells_reset_state[i], cells[i]);
  460. end
  461. endgenerate
  462.  
  463. // Show the cells on the VGA display
  464. display(cells, x, y, r, g, b);
  465.  
  466. endmodule
  467.  
  468. /**
  469. * Uses CLOCK_50 to slow down Clk to 2 Hz
  470. */
  471. module clock(Clk, Clk_50);
  472. input Clk_50;
  473. output Clk;
  474. reg [31:0] counter;
  475.  
  476. always @(posedge Clk_50) begin
  477. if (counter == 25000000)
  478. counter <= 0;
  479. else
  480. counter <= counter + 1;
  481. end
  482. assign Clk = (counter == 25000000);
  483. endmodule
  484.  
  485. /**
  486. * Create a Conway's Game of Life cell with the specified
  487. * neighbours, clock, reset, initial state, and current state
  488. */
  489. module life_cell(neighbours, Clk, Rst, initial_state, state);
  490. input [7:0] neighbours;
  491. input Clk;
  492. input Rst;
  493. input initial_state;
  494. output reg state;
  495.  
  496. wire [3:0] population;
  497. wire next_state;
  498.  
  499. // population is the count of neighbouring cells that are alive (i.e. on)
  500. assign population = neighbours[7] +
  501. neighbours[6] +
  502. neighbours[5] +
  503. neighbours[4] +
  504. neighbours[3] +
  505. neighbours[2] +
  506. neighbours[1] +
  507. neighbours[0];
  508.  
  509. // next_state is the next state (alive or dead) of this cell
  510. assign next_state = (population == 2 & state) | population == 3;
  511.  
  512. always @(posedge Clk or negedge Rst) begin
  513. if (!Rst) begin
  514. // When reset fires, return this cell to its initial state
  515. state = initial_state;
  516. end else begin
  517. // When the clock fires, bring this cell to its next state
  518. state = next_state;
  519. end
  520. end
  521. endmodule
  522.  
  523. /**
  524. * Display the grid of cells on the VGA display.
  525. */
  526. module display(cells, x, y, r, g, b);
  527. input [0:64*48-1] cells;
  528. input [9:0] x, y;
  529. output [9:0] r, g, b;
  530.  
  531. // x and y change at a fast rate;
  532. // the colour of the pixel at the current (x, y) coordinates is determined by RGB
  533. reg [29:0] RGB;
  534. always @(x or y) begin
  535. // row = y / 10
  536. // column = x / 10
  537. // cell = (row * 64) + column
  538.  
  539. // Find the cell index using `(y / 10) * 64 + (x / 10)`. See pseudocode above.
  540. if (cells[(y / 10) * 64 + (x / 10)]) begin
  541. // The cell that covers this (x, y) coordinate is alive, so turn on the pixel on
  542. RGB = 30'b111111111111111111111111111111;
  543. end else begin
  544. // The cell that covers this (x, y) coordinate is dead, so turn on the pixel off
  545. RGB = 30'b000000000000000000000000000000;
  546. end
  547. end
  548. assign r = RGB[29:20];
  549. assign g = RGB[19:10];
  550. assign b = RGB[9:0];
  551.  
  552. endmodule
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