| 摘要 |
PURPOSE:To make a peripheral circuit device of CPU possible to meet an arbitrary computer system by providing the peripheral circuit device with a control circuit having a control terminal that is operated to switch the relationship of correspondence between the address input signal and select signal in a select signal generating circuit. CONSTITUTION:The peripheral circuit device of CPU according to the present invention has a select signal generating circuit 5 that generates a select signal that selects from a plurality of large scale function cells 10-12 a large scale function cell that allows for accessing the CPU based on an address input signal, a control terminal 7, and a control circuit 6 that changes, when this control terminal 7 is operated to switch, the relationship of correspondence between an address input signal and select signal in the select signal generating circuit 5, and a control section 9 constituted by programmable logic devices. Accordingly, by operating the control terminal 7 to change, the relationship of correspondence between the address input signal and the select signal can be changed. With this, the peripheral circuit device of CPU is applicable to another computer system. |
