Region searcher and method of driving the same and code searcher using the same

A method of driving a region searcher comprising the steps of:

• (a) setting variables;
• (b) receiving an input energy value and an input location value by using an input signal converting section and an index comparing section;
• (c) comparing said input location value with a location value stored in said second buffer section by using said index comparing section;
• (d) converting said input energy value by a predetermined energy value ratio by using said input signal converting section, if said input location value is not equal to the location stored in said second buffer section in the third step;
• (e) comparing the energy value converted in the fourth step with the energy value stored in said first buffer section, and, if the converted energy value is larger than the energy value stored in said first buffer section, replacing said converted energy value with an smallest energy value among the energy values stored in said first buffer section, and, if so not, receiving a new energy value;
• (f) converting the input energy value and the energy value stored in said second buffer section by using a predetermined energy value ratio if said input location value is equal to the location value stored in said second buffer section in the third step;
• and
• (g) removing the energy value stored in the location of said second buffer section corresponding to the input location value in order to store the energy value converted in the sixth step, aligning the energy values in the second buffer section in accordance with the size thereof, and storing said added energy values thereto.