| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for providing flexible input and output in both high-speed and lower-speed. <P>SOLUTION: An input and output structure having a high-speed input, a high-speed output, a low or medium speed input, and an low or medium speed output is provided. One of the input and output circuits are selected and the others are deselected. A high-speed input and output circuit is comparatively simple, for example having only a clear signal for a control line input, and can interface to a low speed circuitry inside the core of an integrated circuit. The low or medium speed input and output circuit is more flexible, for example, having preset, enable, and clear as control line inputs, and can support JTAG boundary testing. These parallel high and lower speed circuits are user selectable, and accordingly the input output structure is optimized between speed and functionality depending on the requirements of the application. <P>COPYRIGHT: (C)2008,JPO&INPIT |
