Information processing apparatus and clock automatic tuning control system clock and automatic tuning

摘要

PROBLEM TO BE SOLVED: To enable exhition of system performance to the utmost by reducing labor to be required for clock tuning and assuring only an operation margin to be required, at actual operation. ;SOLUTION: A data pattern generated by a data pattern generating circuit 120 of a constituted device 100 on the transmitting side is transmitted to a data bus 312 through transmission latches 102-1 to 102-n, data transfer from the constituted device 100 to a constituted device 200 is verified, based on the data pattern from the constituted device 100 received by reception latches 203-1 to 203-n by a data pattern verifying circuit 260 of the constituted device 200 on the receiving side and a phase of the clock for the transmission latches 102-1 to 102-n and the phase of the clock for the reception latches 203-1 to 203-n are adjusted so that the data transfer from the constituted device 100 to the constituted device 200 is performed within a prescribed number of clock cycles according to a verification result by a clock automating tuning control circuit 400.;COPYRIGHT: (C)2001,JPO