| 摘要 |
PURPOSE:To expand flexibly a memory without requiring any complicated circuit by providing a means assigning an additional bit for memory mapping to a low-order bit of a memory address. CONSTITUTION:A memory map controller 7 is provided to assign the additional bit for memory mapping to low-order bits MA0-MA2 of the memory address at an even number memory 8 and an odd number memory 9. Fifteen address lines A0-A14 from the system are required when three additional bits for mapping and a 256-Kbyte of memory capacity are used. In actual memory address lines MA0-MA17, 256-Kbyte is divided in this case into 32-KbyteX8. |
