| 摘要 |
PURPOSE:To offer a circuit capable of rapidly generating circumpherential addresses even when a rapid and large capacity memory is not used for a memory table. CONSTITUTION:The X and Y coordinate values of only the 1st quadrant part of a circle are stored in two memory tables 4, 5 and a 2-bit counter 1 for expressing four quadrants is arranged on the outside of the tables 4, 5. While inverting or non-inverting the X and Y coordinate values outputted from the memory tables by a 2-bit output from the counter 1, the circuit 1 converts the X and Y coordinates into four quadrants to express the coordinate values of the whole circumference. |
