PROGRAMMABLE INTEGRATED CIRCUIT MEMORY HAVING EMULATION MEANS

摘要

PROBLEM TO BE SOLVED: To test a fresh algorithm without requiring manufacturing of a corresponding plot type, by enabling an emulation mode operation using a tester outside an integrated circuit in place of a state machine. SOLUTION: A state machine 2 having a programmable logic array(PLA) 24, a sequencer 28, etc., carries out an algorithm selected by a user control unit 3, whereby a general mode is executed to control a column-programming voltage generator 4, a row decoder 5, a column decoder 7, a gate power feed circuit 14, a source power feed circuit 14, a column selection circuit 9, etc., by programs. On the other hand, an emulation mode is also carried out by multiplexers 13, 15, 16, etc., wherein an external tester can be used in place of the machine 2. Therefore, the algorithm can be changed without forming a plot type. A burning test or the like is easily and surely conducted in a wide range.