| 摘要 |
PURPOSE:To avoid the malfunctions despite the deterioration of the noise margin by securing such a constitution where a unit set at the transmission side turns the address data put on an address bus into the invalid address value when an acceptance signal is sent back to a strobe signal and then deletes the strobe signal. CONSTITUTION:A unit set at the transmission side turns the address data ABUS put on an address bus 2 into the invalid address value when an acceptance signal DACP is sent back to a strobe signal DSTRB and then deletes the signal DSTRB. Thus the receiver unit of the data ABUS put on the bus 2 is already turned into an invalid address before the signal DSTRB is changed to a high level (insignificant) from a low level (significant). As a result, the rise of a waveform is slow and the waveform of the signal DSTRB becomes dull. Thus any unit 1 has no reaction even in a misdetection state where the noises are produced at the rise part of the waveform of the signal DSTRB and the signal DSTRB is changed to a low level from a high level with a unit set at the reception side. Thus no malfunction is produced in a data transfer system. |
