JPS6462741A - Main storage device - Google Patents

Abstract

PURPOSE:To mix and mount, and control main storage cards whose access speeds are different, by providing a timing selecting part for selecting and outputting a necessary timing signal, based on address information, an operation discriminating signal and an access speed discriminating signal. CONSTITUTION:The titled device is provided with a timing generating part for generating the access speed discriminating signals 22, 23 for showing an access speed at every main storage card 1b, 2b, and also, generating plural kinds of timing signals at every various timing control signals, and a timing selecting part for selecting and outputting a necessary timing signal, based on address information 10, an operation discriminating signal 9 and access speed discriminating signals Ta, Tb, from in the timing signals. That is, by a timing control part 6b, a necessary timing control signal is generated dynamically, each time of its access in accordance with an access speed at every main storage card 1b, 2b. In such a way, main storage cards whose access speeds are different can be mixed and mounted, and controlled.