Data reception apparatus oversampling received bits and data communication system oversampling received bits

摘要

A data reception apparatus obtains an integrated number of bits by integrating the numbers of bits of a bit string, obtains an integrated number of samples by integrating the number of samples obtained by oversampling each bit, obtains an approximated line that indicates correspondence between the integrated number of bits and the integrated number of samples, determines, based on the approximated line, a bit length of a bit string corresponding to a segment in which identical values continue in oversampling data after the integrated number of samples. Even when a receive-side clock source has a degree of clock frequency error against a transmit-side clock source, how many samples one bit of the bit string corresponds to is obtained with an accuracy higher than a period of oversampling (inverse of the number of samples).

主权项

1. A data reception apparatus comprising:
a receive-side clock source separate from a transmit-side clock source of a data transmission apparatus that transmits data, the receive-side clock source generating a receive clock and outputting the receive clock; an oversampling data generation section that generates oversampling data by oversampling each bit of a received bit string that is received from the data transmission apparatus in synchronization with the receive clock inputted from the receive-side clock source; a bit integrated number calculation section that calculates an integrated number of bits by integrating a predetermined number of bits in the received bit string; a sample integrated number calculation section that calculates an integrated number of samples by integrating the number of samples corresponding to each bit of the predetermined number of bits integrated by the bit integrated number calculation section, in the oversampling data generated by the oversampling data generation section; and a data determination section
that obtains an approximated line based on a plurality of points each of which indicates correspondence between the integrated number of bits and the integrated number of samples, andthat determines, based on the approximated line, a bit length in a bit string in the oversampling data generated by the oversampling data, the bit string corresponding to a segment in which identical values continue in the oversampling data after the integrated number of samples calculated by the sample integrated number calculation section.