| 摘要 |
PROBLEM TO BE SOLVED: To reduce the circuit scale of a comparison circuit and to reduce power consumption by OR-operating the bit of a logic value which is more than a threshold, which is settled within the permission error range of the threshold and in which only one bit becomes '1', and a bit higher than the mentioned bit. SOLUTION: The comparison circuit OR-operates the bit of the logic value which is approximated the most to the threshold and in which only one bit becomes '1', and the bit higher than the bit. Namely, a discrimination circuit is constituted of one five input-type OR gate 11. When the threshold Th is rounded up from '5' to '8', for example, the threshold Th2='8' is '01000'. Thus, either bit '4' to '3' is '1', and it means that the value is larger than the threshold '8'. Thus, an OR gate 12 which OR-operates the highest bit (MSB)[4] and the fourth bit [3] is used and a discrimination result showing that an error exists in transmission data is outputted from OR gate 12. Then, it is sent to a selection circuit. |
