JPS6454544A - Data scanning system - Google Patents

Abstract

PURPOSE:To change no data array in a prescribed word length unit at a position on a scan map even against a change of a hardware, by providing a read-out position correcting means, and correcting a read-out position, based on a set critical value, etc. CONSTITUTION:In case when a change is generated in a data store position of a data store means 1 due to an addition, etc., of a hardware for constituting the means 1, first of all, a critical value and a correction value are set. Subsequently, a read-out position correcting means 6 corrects a read-out position, based on the critical value and the correction value which have been set, and sends out the corrected read-out position to a read-out command means 5. Also, a data position in the means 1 after the change becomes the same as before the change with regard to the position in a prescribed word length unit. In such a case, the means 5 executes a read-out command to a register 4, when a data to be read out has been held in the register 4, based on the red-out position which has been corrected by the means 6, and a clock signal from a clock signal generating circuit 2. In such a way, even in case when a hardware is changed, a data array in the prescribed word length unit is changed, and the program change can be minimized.