Patent ID: 8588340
Filing Date: 2013-11-19
Classification: H04L

Abstract:
1. A receiving device comprising: an equalizer circuit shaping a waveform of an input signal according to an equalizer coefficient; a Clock Data Recovery circuit recovering, from the input signal being shaped by the equalizer circuit, received data represented by the input signal and a clock signal which indicates a timing of the received data; a number counting part counting a number of times a voltage value included in a range of detection is obtained by sampling the input signal after being shaped by the equalizer circuit at the timing of the received data, the range of detection having a predetermined width; a zone scanning part scanning the range of detection in a scanning zone to make the number counting part count, in a time-division manner, a number of times of obtaining each voltage value included in the scanning zone by sampling the shaped input signal, the scanning zone being a predetermined range including a variation range of a voltage value of the input signal; a coefficient altering part altering the equalizer coefficient of the equalizer circuit; a peak detecting part detecting a maximum value of a counting result as a peak value for each equalizer coefficient being altered by the coefficient altering part, the counting result being obtained by the number counting part in a process where the range of detection is scanned; and a coefficient specifying part specifying, as a first coefficient, the equalizer coefficient, which is set to the equalizer circuit when the peak value is detected by the peak detecting part, wherein the zone scanning part scans the range of detection by changing, in every predetermined counting period and by a voltage corresponding to a width of the range of detection, a reference voltage indicating an upper limit of the range of detection; and the number counting part includes: