JPS6450120A - Register file - Google Patents

Abstract

PURPOSE:To decrease the hardware quantity, and also, to prevent the increase of a set-up time of a write address, by providing an address use sub-latching circuit and an address use main latching circuit having an address selector function. CONSTITUTION:In a register file which is stored temporarily a write address in an address use main latching circuit group 3, so that a data is written to a store position corresponding to this stored address, an address use sub-latching circuit group 12 is provided. In the circuit group 12, an output address of the circuit group 3 is stored, and to an output of the circuit group 3, '1' is added through an adder 11, and in response to a reset command signal, an input of the circuit group 3 is switched to an output of the adder 11 from the write address through a selector group 9, and in accordance with a reset instruction signal, the write data is supplied as '0'. In such a way, a value of the circuit group 3 is counted up through the circuit group 12 and the adder 11, whenever a reset signal is inputted, therefore, the hardware quantity is decreased and the increase of a set-up time of a write address can also be reduced.