| 摘要 |
PROBLEM TO BE SOLVED: To efficiently acquire I/O partial products from relative many address partial products when constituting such memory module as a DRAM using the partial products. SOLUTION: In the memory module which is constituted of four defective chips 1-4 according to I/O partial products where address partial products have been relieved and one good chip 5, each is connected to I/O terminal I/O0-I/O15 and common address input terminal AX0-AX12. For the relief of the address partial products to I/O partial products, there are three methods, namely, a method for perfuming DC relief by cutting the power supply of a defective mat immediately before entering a memory mat, a method for preventing a defective mat from being activated by fixing the selection signal of the defective memory mat to a low level, and a method for relieving by switching the selection signal of memory mats and further changing the connection of I/O lines. |
