JPS6488641A - Information processor - Google Patents

Abstract

PURPOSE:To use an idle time of a main storage device and to execute a partial write with minimum redundancy bits for one word length without impairing the processing performance of the titled processor by holding an address where a write is partially executed, and starting the correction with a correction request signal. CONSTITUTION:When a correction request signal 13 is inputted from a control part 24, a timing control circuit 28 is activated, a 32-bit data is read out from an address in an address holding circuit 25, redundancy data in seven bits for the read data is generated, the thirty-two and the seven bits (data + redundancy bits) are written in a memory chip part 23, and the content of the address holding register 25 which is a partial write register is erased. By the activation of the correction request signal 13, the correction of the redundancy bits of an address partially written in the idle time of the main storage device 2 is possible. As a result, a partial write is enabled with the minimum redundancy bits for one word length.