| 摘要 |
PURPOSE:To improve the using efficiency of a memory space by accessing to a common area with a control memory address when a band/common area selection signal indicates the common area, then accessing to the corresponding bank when said selection signal is indicating a bank, respectively. CONSTITUTION:A bank selection information REG1 which indicates one of plural banks is set together with a bank/common area selection signal SEL which designates the common area EQ of a control memory or a bank area BK, and a control memory address A which indicates the address in an area EQ or area BK. When the signal SEL indicates the area EQ, an access is fed to the area EQ with the address A. While an access is fed to the corresponding area BK with the bank information (n) and the address A when the signal SEL indicates the area BK. In such a way, no unused area is produced within a memory space. This improves the using efficiency of the memory space. |
