162 results about "Timing results" patented technology

The invention provides a PPP-RTK positioning method based on a low-orbit constellation navigation augmentation system. The method includes the steps that direct transmission signals broadcasted by multi-system navigation satellites and low-orbit constellations are received to generate original observation data; navigation satellite augmentation information broadcasted by the low-orbit constellations and low-orbit satellite precise orbits and precise clock difference are received; precise point positioning is conducted by utilizing the navigation satellite augmentation information, the low-orbit satellite precise orbits and precise clock differences and the original observation data; or, when ground-based augmentation comprehensive error correction information is received, ground-based augmentation precise point positioning is conducted by comprehensively utilizing the navigation satellite augmentation information, the low-orbit satellite precise orbits and precise clock difference, theoriginal observation data and the ground-based augmentation comprehensive error correction information. By means of the method, near-real-time precise positioning, velocity measuring and timing results can be obtained in the globe, real-time centimeter-level positioning, velocity measuring and timing results can be obtained in ground-based augmentation regions, and seamless switching between ground-based augmentation regions and non-ground-based augmentation regions of the global region can be achieved.

A hybrid linear wire model for tuning the transistor widths of circuits linked by RC interconnects is described. The method uses two embedded simulators during the tuning process on netlists that contain resistors (Rs). A Timing oriented simulator is used only for timing purposes on the original netlist that includes all the Rs. A Gradient oriented simulator is then run only on the modified netlist with all Rs shorted and within the iterative loop of the tuner to compute gradients. The present hybrid method achieves a significant improvement in computational speed. The Timing oriented simulator is fast and accurate for only timing netlists with Rs, but cannot compute gradients efficiently. The Gradient oriented simulator computes gradients efficiently but cannot do so in the presence of Rs. To prevent “de-tuning” that typically occurs when all Rs are shorted, ‘wire-adjusts’ are provided that make the initial timing results using the Gradient oriented simulator on the shorted netlist match the timing results using Timing oriented simulator on the original netlist. This permits the optimizer sense initially the correct set of critical timing paths, and more significantly, it permits the wire-adjusts keep track of the changing transistor widths to guide the optimizer during the iterations until convergence is achieved.

A method, system, apparatus, and machine-readable medium for physical placement of an integrated circuit based on the timing constraints are provided. The method involves a two-pass physical placement technique. After the first pass of the physical placements of the blocks and the top level, the timing results of the top level and of each block are analyzed. The method involves the computation of latency per gate per unit area (LPGA) of the block ports of each block. Based on the calculated LPGA, the timing constraints of the blocks are updated. The second pass of physical placement is performed, based on the updated timing constraints.