Patent ID: 7272738

Claim:
A data transmission system, comprising: a slave device including a slave side clock signal generator section coupled to generate a slave side clock signal; a phase adjusting circuit coupled to control a phase of the slave side clock signal; a slave output section coupled to output a transmission data signal to a first bus line in response to the slave side clock signal; and a timing reference signal generating section coupled to output a timing reference signal to a second bus line in response to the slave side clock signal; a master device including a master side clock signal generation section coupled to generate a master side clock signal; a master input section coupled to sample a first data signal transmitted through the first bus line; and a phase compare circuit coupled to generate a phase adjustment instruction signal on the basis of the master side clock signal and the timing reference signal transmitted through the second bus line; wherein the phase adjusting circuit is coupled to receive the phase adjustment instruction signal through a third bus to adjust the phase of the slave side clock signal, and the timing reference signal generator section is coupled to sample phase adjusting data in response to the slave side clock signal to generate the timing reference signal.