SEMICONDUCTOR DEVICE ABLE TO BE PRODUCED BY CONVERTING EMBEDDED MEMORY FROM RAM TO ROM, IN WHICH MASS PRODUCTION CHIP IS SUPPLIED RAPIDLY

摘要

PURPOSE: A semiconductor device is provided to convert a DRAM cell to a ROM by changing a slice mask, without changing a peripheral circuit layout for reading. CONSTITUTION: The semiconductor memory device(1) includes a row/column decoder(6) receiving an address signal(ADR) from a central processing unit(2), and a control circuit(4) receiving a command signal(CMD) from the CPU, and memory cell arrays(22,24,26,28) and sense amplifiers(30,32,34,36,38) and a preamp/write driver(40) and switches(12-18). Each memory cell array includes a memory cell(MC) and a bit line(BL) and a word line(WL). The row/column decoder selects the word line of the memory cell array(26) by receiving the address signal from the CPU. The switches performs the switching between a ROM and a RAM as to each memory cell array after a master slice process.