JPS57186299A - Data processing device - Google Patents

Abstract

PURPOSE:To perform highly reliable reading and writing operations which are necessary for testing and diagnostic, by installing an aritifical memory having a small capacity which has a processing device with the interface specifications which is smaller to that of an ordinary memory and which is able to perform reading and writing operations, commonly to the interface line. CONSTITUTION:The titled device consists of an aritifical memory 1 which commonly uses an interface line of a processing device P of a memory M and performs reading and writing operations based on the signal on the interface line, an instruction decoding circuit 2 which designates reading and writing operations to the artificial memory 1, a designation flip flop 3 which is set by the command from the processing device P, a memory access managing circuit 4 which generates an access request signal to the artificial memory 1, and a read-out data switching circuit 6 which switches each reading out bus. The artificial memory 1 performs reading and writing operations from the memory M based on the command from the flip flop 3.