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By: a guest on Feb 13th, 2011  |  syntax: None  |  size: 0.59 KB  |  views: 53  |  expires: Never
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  1. KO7I nRST Qi | KO7O Qi+1
  2. -------------+----------
  3. X    L    X  | L    A           after reset, lock KEYOUT7 low (1)
  4. H    H    A  | L    A           stay locked while KO7I is high
  5. L    H    A  | L    B           KO7O tracks KO7I after first L on KO7I (2)
  6. L    H    B  | L    B           (3)
  7. H    H    B  | Z    B           note that KO7O is open collector/tri-state (4)
  8.  
  9. (1) possibly equivalent alternatives:
  10.     X H->L X | L A
  11.     X L->H X | L A
  12. (2) equivalent alternative:
  13.     H->L H A | L B
  14. (3) equivalent alternative:
  15.     H->L H B | L B
  16. (4) equivalent alternative:
  17.     L->H H B | Z B
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