Abstract: Method of developing a model of a circuit design including the steps of generating four different path-tracing runs, creating four arcs from the four different path-tracing runs, and combining the four arcs into two separate models. Also, a method of adjusting timing of a clock signal provided to a first block and a second block where data signals travel via a first path from the first block to the second block and data signals travel via a second path from the second block to the first block and the time for the data signals to travel the first path is greater than the time for the data signals to travel the second path. The clock signal provided to the second block relative to the clock signal provided to the first block is delayed by an amount that is a function of the difference between the time for the data signals to travel the first path and the time for the data signals to travel the second path.

Abstract: A height adjustment device for the arm of an engraving machine is disclosed herein. Present invention provides a turn knob on a holding piece having threaded portion engaged to a threaded hole on the arm, so that when making height adjustment, the weight of the arm is supported by the present invention, but by user's strength, greatly enhancing the safety of operation and the precision of making such adjustment.

Abstract: A multifunctional marking device comprises one or two types of markers and a fastener for facilitating closure of button-secure tags. In particular, the fastener comprises a recess provided at one end of the device or a cap of the markers. Preferably, the marking device comprises both a writing instrument such as a pen and a stylus with a metal point to meet a need for making different types of markings.

Abstract: Methods are disclosed for improving the design of integrated circuits.