| 摘要 |
PURPOSE:To curtail hardware quantity by integrating an approximate inverse number table for storing a divisor whose use frequency is low, and a memory decoder for storing a control signal to an operating circuit, in the same storage means, and switching and using a read-out address and an output data. CONSTITUTION:In an approximate inverse number table/memory decoder 30, an approximate inverse number data of a divisor, and a part of plural groups of control signals to an operating circuit 25 are stored by plural words each in mutually different addresses. Switching of an approximate inverse number table function or a memory decoder function of the approximate inverse number table/memory decoder 30 is executed by an address selector 40 in accordance with an indication of a micro-instruction which is sent out onto a signal line 78 from a micro-instruction register 20. |
