Abstract: A phase lock loop (PLL) clock generator with programmable frequency and skew is provided in the present invention, in which frequency of clock signals generated can be dynamically changed and skew of the clock signals generated can be dynamically adjusted by a computer program. Also, the signal skew due to the change of loading can be compensated. Therefore, the PLL clock generator based on a closed-loop configuration can better control the skew of clock signals to provide higher stability and durability to the system.

Abstract: A method for evaluating cross-talk of a circuit and signal degrading due to mutual electric coupling between wires of a circuit. The method includes: simulating the signal transmitting on wires of the circuit during the normal operation of the circuit, and implementing cross-talk analysis of the circuit to modify the analysis according to the signal variation during the practical operation of the circuit in order to evaluate the cross talk on each wire in the circuit.

Abstract: The design flow method of the present invention accurately performs timing analysis during the circuit design stage, so that the DFT synthesis procedure can effectively control the timing information, preventing timing violation from happening during the IC design flow process. Furthermore, the information of the CTS procedure and the static-timing analysis procedure is combined to perform accurate timing estimation.

Abstract: A method for performing multi-clock static timing analysis to determine whether a timing violation occurs on a logic circuit. A set of clock signals that are expected to cause a logic circuit to be in a worst-case situation if analyzed by using static timing analysis can be selected from a number of possible clock signals by using a simple determination process. The selected set of clock signals are then employed in static timing analysis on the logic circuit to verify whether no timing violation occurs on each signal transmission path of the logic circuit. If not, it indicates that the logic circuit using any selection of the possible clock signals will not cause timing violation thereon.

Abstract: A signal converting device and method for converting signals from memory interfaces into main system interfaces. The present invention can completely convert response signals from high frequency devices into low frequency devices, for solving low efficient and disadvantages caused by asynchronous conversion. The signal loss is not occurred when the signal converting device is in pseudo synchronization. By applying the present invention, the computer system can work normally and rapidly, in which the frequency of the request signals from the main system interface is higher than half of the frequency of the response signals from the memory interface. The compurter system is, for example computer system for 100 MHz/133 MHz or 66 MHz/100 MHz.

Abstract: A method of determining joint stiffness degradation in structure 10 is provided including a first exciting of the structure 18, a first measuring of transfer function and frequency response function 20, simulating a mileage accumulation process of the structure 16 performed after the first exciting 18 and the first measuring 20, a second exciting of the structure 22, performed after the simulating a mileage accumulation process 16, a second measuring of frequency response function 24 performed after the simulating a mileage accumulation process 16 and calculating the change in joint stiffness 26 using the first measuring 20 and the second measuring 24.

Abstract: A static timing analysis method on a circuit using generated clock, so as to solve the issues that the conventional static timing analysis cannot be performed on the circuit of flip-flop and the latch using generated clock. By the method of the invention, the user can promptly known whether or not the signal path with respect to the flip-flop and latch has timing violation, whereby the correctness of the clock used in the circuit can be judged.

Abstract: A control chip having a multiple-layer defer queue therein and a method of operating the control chip. The control chip is coupled to a CPU bus and a PCI bus. The control chip comprises of a PC request queue, a multiple-layer defer queue, a PCI access queue and a PCI controller. The multiple-layer defer queue facilitates the processing of a multiple of concurrent CPU requests that belong to a first request type. The multiple-layer defer queue supports retry and defer transactions, thereby reducing data transmission between the CPU and the control chip.

Abstract: An implementing method for buffering devices is provided, so as to dispose the buffering devices on a chip. The chip includes a signal source root and the number X of output bonding pads, in which the number X is a positive integer. The implementing method of the present invention includes (a) implementing a buffering device for the Nth layer at a location close to the middle place between two output bonding pads, and electrically connecting each one of the output bonding pads to the corresponding one of the buffering devices for the Nth layer, respectively. (b) A buffering device for the N+1th layer is implemented at a location close to the middle place between two buffering devices for the Nth layer, and each one of the buffering devices for the Nth layer is electrically connected to the corresponding one of the buffering devices for the N+1th layer, respectively. Then, the number of the buffering devices for the N+1th layer is judged whether or not to be 1.

Abstract: A method of determining joint stiffness degradation in structure 10 is provided including a first exciting of the structure 18, a first measuring of transfer function and frequency response function 20, simulating a mileage accumulation process of the structure 16 performed after the first exciting 18 and the first measuring 20, a second exciting of the structure 22, performed after the simulating a mileage accumulation process 16, a second measuring of frequency response function 24 performed after the simulating a mileage accumulation process 16 and calculating the change in joint stiffness 26 using the first measuring 20 and the second measuring 24.

Abstract: A static timing analysis method on a circuit using generated clock, so as to solve the issues that the conventional static timing analysis cannot be performed on the circuit of flip-flop and the latch using generated clock. By the method of the invention, the user can promptly known whether or not the signal path with respect to the flip-flop and latch has timing violation, whereby the correctness of the clock used in the circuit can be judged.

Abstract: A method for scheduling execution sequence of read and write operations is disclosed, which is used for controlling the read and write operations between a first device and a second device. First, if there are more than two write operations waiting to be executed, the write operations are executed only after the completion of all of the read operations. If there are no more than two write operations waiting to be executed and there are read operations waiting to be executed, all of the read operations are to be executed when the read operation to be executed is associated with a data address different from the data address associated with the write operation next to the read operation. After all of the read operations are executed, the write operations are to be executed.

Abstract: A chip testing system using an internal signal of the chip under test to produce a blanking signal so as to avoid a conflict in the turn-around cycle between input mode and output mode. The preceding signal, posterior signal and reverse phase signal of the output enable signal of the chip under test are used to match with a testing circuit for producing a blanking signal, which is driven only when the output enable signal is at a high potential, enabling the state machine in the chip to control data reading time, so as to avoid a conflict in the turn-around cycle between input mode and output mode.

Abstract: A method for a CPU interface to control a writing process that writes data sent from a CPU to a memory. The CPU interface controls the writing process through steps mainly including receiving a write request and data from a CPU, sending a dummy request to the memory control circuit of the memory circuit, and then writing the data to a memory of the memory circuit. After the CPU interface receives a write request from the CPU, the CPU interface sends a dummy request to the memory control circuit to pre-charge and activate the designative memory page of the memory circuit before the data is sent to the memory circuit. Since the designative memory page is always pre-charged and activated while the data is received at the memory control circuit, the memory control circuit sends only a write command to the memory for writing the data to the memory without further pre-charging and activating the designative memory page.

Abstract: A method of using a microscopic digital imaging strain gauge includes the steps of creating a mark pattern on an object surface, positioning an image sensing device over the mark pattern, magnifying the mark pattern with a magnification lens, taking a first magnified image of the mark pattern with the image sensing device, applying a load to the object surface, taking a second magnified image of the mark pattern, and utilizing a processor to calculate the strain as derived from the first and second magnified images.

Abstract: A gated clock tree synthesis (CTS) method is provided for the purpose of synthesizing a gate array logic circuit to allow optimal topological arrangement of the gate array on the logic circuit. This in turn allows the logic circuit to operate more efficiently. The logic circuit includes at least one clock generator, a plurality of control gates each having one input end connected to a control signal and the other input end connected to receive the output clock signal from the clock generator, a plurality of first logic elements that are directly driven by the output clock signal from the clock generator, and a plurality of second logic elements that are driven by the gated clock signal outputted from each of the control gates under control by the control signal.

Abstract: A strain gauge includes an image sensing device having a lens, a magnification lens optically coupled to the lens, a positioning mechanism connected to the image sensing device, an image capture device for receiving an image from the image sensing device, and a processor for mathematically analyzing the image received from the image capture device and to calculate strain.