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Yesterday is history, tomorrow is a mystery, So Today is a present
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The problem with natural binary codes is that physical switches are not ideal: it is very unlikely that physical switches will change states exactly in synchrony. In the transition between the two states shown above, all three switches change state. In the brief period while all are changing, the switches will read some spurious position. Even without keybounce, the transition might look like 011 — 001 — 101 — 100. When the switches appear to be in position 001, the observer cannot tell if that is the "real" position 001, or a transitional state between two other positions. If the output feeds into a sequential system, possibly via combinational logic, then the sequential system may store a false value.
          
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°ªÀÇ Áõ°¡³ª °¨¼Ò°¡ ¹ß»ý ÇÏ´Â ½ÃÁ¡¿¡ ´Ù¸¥ µµ¸ÞÀÎÀ¸·Î Àü´ÞµÉ¶§ ÇϳªÀÇ ºñÆ®¸¸ ¹Ù²î±â ¶§¹®¿¡ ¸®ÄÁ¹öÁ¯½º ¹®Á¦°¡ ¹ß»ýÇÏÁö ¾Ê±â¶§¹®ÀÌÁÒ

Bin -> bin2gary -> gray code -> cdc sync -> gray code -> gray2bin -> Bin
cdc sync ÀÌÀü ÀÌÈÄ Å¬·° ÁÖÆļö ¿Í ÆäÀÌÁî°¡ ´Þ¶óµµ ÇϳªÀÇ ºñÆ®¸¸ÀÌ ¹Ù²î¹Ç·Î Ŭ·°°£ µ¿±âȸ·Î°¡ ´ÙÁߺñÆ® º¯°æ¶§¿Í ´Ù¸£°Ô ¸®ÄÁ¹öÀü½º À̽´¸¦
ȸÇÇÇϰԵǾî À߸øµÈ µ¥ÀÌÅÍ Àü¼ÛÀÇ ¹®Á¦°¡ ¹ß»ý ÇÏÁö ¾Ê°Ô µË´Ï´Ù


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