One-time memory control apparatus

摘要

A one-time memory control apparatus is obtained that prevents erroneous opening of a fuse from causing logic conversion and enhances the reliability. The one-time memory control apparatus includes an opening current creation fuse C opening switch and an opening current creation fuse D opening switch that each allow a fuse opening current from a fuse opening current creation circuit to flow in response to an opening enable signal, and a fuse opening permission signal creation circuit that receives respective logic signals corresponding to the states of fuse opening currents that flow through an opening current creation fuse C and an opening current creation fuse D, and that creates a fuse opening permission signal.

主权项

1. A one-time memory control apparatus for a one-time memory that retains information by use of a fuse, comprising:
a fuse opening current creation circuit that creates a fuse opening current in response to a fuse opening permission signal; a first information fuse opening switch that is connected with a first information fuse and allows a fuse opening current from the fuse opening current creation circuit to flow in response to an opening enable signal; a second information fuse opening switch that is connected with a second information fuse and allows a fuse opening current from the fuse opening current creation circuit to flow in response to an opening enable signal; a first opening current creation fuse opening switch that is connected with a first opening current creation fuse and allows a fuse opening current from the fuse opening current creation circuit to flow in response to an opening enable signal; a second opening current creation fuse opening switch that is connected with a second opening current creation fuse and allows a fuse opening current from the fuse opening current creation circuit to flow in response to an opening enable signal; a logic circuit to which respective logic signals corresponding to the states of fuse opening currents that flow through the first information fuse, the second information fuse, the first opening current creation fuse, and the second opening current creation fuse are inputted; and a fuse opening permission signal creation circuit that is provided in the logic circuit, that receives respective logic signals corresponding to the states of fuse opening currents that flow through the first opening current creation fuse and the second opening current creation fuse, and that creates the fuse opening permission signal.