MEMORY CIRCUIT AND METHOD OF WRITING DATA ON AND READING OUT DATA FROM MEMORY CIRCUIT

摘要

A memory circuit comprises a first latch circuit and a second latch circuit into which input data is written with clock signal timing and which retains the written data, a data input circuit for inputting data to the first latch circuit and the second latch circuit when a Write Enable signal is in a state indicating writable, and a write-back circuit which inputs the data retained in the second latch circuit to the first latch circuit when the Write Enable signal is in a state indicating non-writable. The second latch circuit is so configured as to have a higher resistance to noise than the first latch circuit.