| 摘要 |
PURPOSE:To easily control an address of a memory device constituted of memory chips having different number of address terminals respectively, by providing each specific boundary value setting means, comparing circuit and gate circuit. CONSTITUTION:This device is provided with a means for setting a mounting boundary value B showing a sort of the first and second memory chips, a comparing circuit 1 for comparing and discriminating this boundary value B and a mounting address signal A, selecting circuits 5, 6 for dividing a 2n input address signal into 2 by a selecting signal C and outputting it as an n/2 output address signal, and gate circuits 2-4 connected to its prescribed input terminals. In this state, when the value of the mounting address signal A has exceeded the boundary value B, the eight signal of a memory address signal is supplied to the prescribed input terminal, and when the value of the mounting address signal A is the boundary value B or less, a prescribed address signal of the memory address signal is supplied to the prescribed input terminal. |
