151 results about "VHDL" patented technology

Digital circuit is synthesized from algorithm described in the MATLAB programming language. A MATLAB program is compiled into RTL-VHDL, which is synthesizable using system-specific tools to develop ASIC or FPGA configuration. Intermediate transformations and optimizations are performed to obtain highly optimized description in RTL-VHDL or RTL Verilog of given MATLAB program. Optimizations include levelization, scalarization, pipelining, type-shape analysis, memory optimizations, precision analysis and scheduling.

Methods, systems, and media for managing functional verification of a parameterizable design are disclosed. Embodiments include a system having a testbench configuration module adapted to configure a testbench, the testbench having testbench signals and one or more instantiated components having a plurality of ports of a generic design, where the testbench signals are wired to the plurality of ports. The testbench may also have one or more instantiated special components based on chip-specific versions of the design where the special components are wired to the same ports as the generic design. The system may also include a functional verification manager that, through a component module, observes values in the testbench and automatically configure a verification environment based on the observed values, including automatic insertion of checkers at different levels of hierarchy. The testbench may be a VHDL or Verilog testbench in some embodiments.

The invention relates to a SDINS/GPS integrated navigation system time synchronization method and synchronous data acquisition method. 1 PPS pulse of a GPS receiver is used as a reference to generate an IMU sampling clock, and the pulse signal outputted from the IMU is counted by a counter in the FPGA, so that IMP data sampling is synchronous with 1 PPS, and the synchronization of IMU data and GPS data is realized. GPS data is received through a serial port for realizing VHDL language. The floating point DSP responds the external interruption of the FPGA, reads the IMU data inside the FPGA, and acquires synchronous IMU data and reads GPS data in accordance with the IMU synchronization marks and GPS reading marks. The invention adopts hardware synchronization and time synchronization, leading to good stability. It can realize re-synchronization with 1 PPS, so as to provide high-precision synchronous data for integrated navigation computation and improve the overall performance of integrated navigation system. The DSP acquires synchronous data with interrupt mode and hardly occupies the DSP resource for computation, leading to good real-time performance.

A tool for designing integrated circuits that optimizes the placement and timing of memory blocks within the circuit. Given a manufactured slice that has a number of blocks already diffused and logically integrated, the memory generation tool herein automatically considers the available diffused memory and the gate array of the slices to configure and optimize them into a customer's requirements for memory. The memory generation tool has a memory manager, a memory resource database, a memory resource selector, and a memory composer. Together these all interact to generate memories from the available memories within the memory resource database. The memory composer actually generates the RTL logic shells for the memories, and outputs the memory designs in Verilog, VHDL, or other tool synthesis language. Once a memory is created, it is tested. Upon successful testing, the memory manager updates the memory resource database to indicate the successfully tested memory is no longer available as a resource for the generation of further memories. A design integrator may review the memory designs output and further integrate the memory, its timing, testing, etc. with other blocks and functions of the integrated circuit.

The present invention is directed to a method and system for translating a high-level language (HLL) code such as C, C++, Fortran, Java or the like into a HDL code such as Verilog or VHDL which requires no modification in the original HLL source code, while supporting a cross call between software and hardware, and even recursive calls in hardware. The system includes: a HLL-to-HLL source translator which reads user programming directive from a translation-targeted high-level language code marked with the user directive, and separates the translation-targeted high-level language code into a hardware code part and a software code part; a main compiler which compiles the software code part; a HLL-to-HDL translator which includes the front-end and middle-end of the main compiler and a HDL backend; a main core which executes the compiled software code part; and a dedicated hardware which executes the HDL code.

The present invention provides a state diagramming environment in a computing device that enables the conversion of a state diagram into a hardware description language. To achieve this conversion, the present invention generates an intermediate representation of the state diagram. The intermediate representation is checked against a set of predefined restrictions for compliance. The state diagramming environment converts the intermediate representation of the state diagram into a hardware description language, such as VHDL or Verilog.

A method and apparatus for generation of CRC generation/checker circuitry. A symbolic simulation-based algorithm to derive boolean equations for a parameterizable data-width CRC generator/checker is described. The equations generated are used to implement a data-flow representation of the CRC circuit in VHDL. The VHDL description is then synthesized into gates.

The invention relates to a multi-channel high precision phase control signal generation device which utilizes a programmable read-only memory to generate a customized special circuit in an FPGA (Filed Programmable Gate Array) circuit through a VHDL (Very High Speed Integrated Circuit Hardware Description Language) language programming. The multi-channel high precision phase control signal generation device comprises a phase shift module, a phase coding module, an address coding module and a plurality of multi-channel gates. By taking a high precision active crystal oscillator as an information source, all multi-channel gates works in parallel to receive phase control signals of a host computer and output square wave signals of a multi-channel special phase. The output square wave signals access resonance of a power amplifier to generate sine wave signals with the same frequency and phase with the traditional output signals and the sine wave signals are used for excitation signals of an ultrasonic transducer array element in a phase control type high intensity focusing ultrasonic treatment system; and the frequency of the crystal oscillator is determined by the resonance frequency and the phase control precision requirements of the ultrasonic transducer array element. The invention dramatically increases the channel amount of the phase control signals and enhances the precision of the phase control signals, thereby satisfying the needs of the high intensity focusing ultrasonic treatment system.

The invention relates to a general thick film type floating plate modulator, which comprises a control component FPGA, a high-speed logic optocoupler, a driving circuit, an impulse isolation transformer, a thick film high-pressure switching circuit and a suspension power supply, wherein the FPGA uses VHDL language to modulate ultra-wide impulse into opening impulse train and truncation impulse; an isolation strip wave duct amplifier of the high-speed logic optocoupler is used for striking a light to protect the FPGA; the driving circuit adopts a high-speed driver to amplify the opening impulse train and the truncation impulse; the impulse isolation transformer comprises a primary electrode and a dual-secondary electrode; the thick film high-pressure switching circuit is composed of an opening tube and a truncation tube auxiliary circuit; the opening impulse train and the truncation impulse are transmitted to the thick film high-pressure switching circuit through the impulse isolation transformer; and the on/off of the opening tube and the truncation tube are switched to realize compatibility of the ultra-wide impulse and a narrow impulse. The invention adopts software language to realize opening/parameters adjustment of the truncation impulse and uses reference level of a low-pressure high-efficiency inverter to adjust positive bias so as to realize generality and interchangeability.

A method of dangling reference detection and garbage collection of VHDL objects within a program includes the steps of providing an Access Value having an Object Reference pointing to an Allocated Object and having and an Access Count pointer pointing to an integer object named Access Count which models a shared access count for the access values. The method sets the Object Reference and the Access Count pointer to null when constructing a new access value and enables an assignment of a negative Access Count to the shared access count when de-allocating a pointer to the Allocated Object. The method also maintains an exact count of a number of pointers pointing to the Allocated Object.

The invention belongs to the field of detection and automatic control. A quantifying-weighing system based on the buoyancy weighing sensing principle comprises a leverage mechanism, a shedding mechanism, a buoyancy sensor and a CPLD control system. According to the liquid buoyancy principle, the buoyancy weighing sensor converts the measured gravity value in the form of linear relation into displacement value which clearly refers to the displacement, and outputs the displacement value in the form of electrical signal. The buoyancy weighing sensor is free of technical defects such as creep deformation, zero point, sensitivity drift and the like. The CPLD control system consists of an R/V change and voltage amplification module, an A/D conversion module, a CPLD data processing module, a display module, a relay part and a motor as well as an electromagnetic vibrating machine control system; and the fundamental controlling principle thereof is that the control system converts a complex digital control logical system into the SOC (design system on chip design) by employing the VHDL language and adopting the top down design method. The invention achieves the effects of reducing the size of the system, enhancing the reliability of the system, shortening the development period, reducing the development cost, and greatly improving the accuracy of the dynamic weighing.

A programmed computer generates descriptions of circuits (called “checkers”) that flag functional defects in a description of a circuit undergoing functional verification. The programmed computer automatically converts the circuit's description into a graph, automatically examines the graph for instances of a predetermined arrangement of nodes and connections, and automatically generates instructions that flag a behavior of a device represented by the instance in conformance with a known defective behavior. The checkers can be used during simulation or emulation of the circuit, or during operation of the circuit in a semiconductor die. The circuit's description can be in Verilog or VHDL and the automatically generated checkers can also be described in Verilog or VHDL. Therefore, the checkers can co-simulate with the circuit, monitoring the simulated operation of the circuit and flagging defective behavior. The programmed computer can automatically determine load conditions of registers in the circuit and automatically generate checkers to flag data loss in the registers. Some of the checkers may use signals generated by other checkers.

The invention relates to a data transmission method based on the AOS encoding. Based on the CCSDS-suggested AOS-formatted design standard, an AOS-formatted VCDU data field is designed in a way that the data field can be divided into sections for use, compiled into a VHDL hardware logic descriptive language, and downloaded to a programmable device FPGA, and the AOS-formatted processing and output of the SAR data stream by hardware such as the FPGA, FIFO and the like is realized. By using a method of dividing the VCDU data unit into sections, when processing the current AOS-formatted frame, the valid data area at the formatted tail can continue reading in the formatted frame because new trace data appears in advance due to the short retrace time of the input data, thereby improving the transmission efficiency of the valid data of the frame, greatly reducing the frame-insufficient phenomena of the data, and being especially suitable for the situations of the trace and retrace wide-range change of the data before and after inputting. The invention effectively inhibits the formatted frame from being filled with an insufficient frame of the valid data, ensures the AOS-formatted efficiency, and enables the data processing to work at a more stable speed all the time. The invention can adapt to the random change of the trace and the retrace of the input data and prevent the formatting mistake.

The invention discloses an SM4 algorithm encryption unit based on an FPGA chip and a USB interface chip. The SM4 algorithm encryption unit based on the FPGA chip and the USB interface chip comprises the USB interface chip, the FPGA chip, a USB interface control module, an SM4 algorithm IP core, an SM4 algorithm control module and an on-chip RAM, wherein the USB interface control module, the SM4 algorithm IP core, the SM4 algorithm control module and the on-chip RAM are realized through the FPGA chip. In the SM4 algorithm encryption unit, the FPGA chip serves as a control core, and the SM4 algorithm IP core and the related control module are realized through the VHDL design; the SM4 algorithm encryption unit is connected to a user terminal through a USB interface, it is guaranteed that important data of a user are transmitted in a ciphertext mode in the network, and consequently quick operation and secure transmission of the data are achieved. The SM4 algorithm encryption unit based on the FPGA chip and the USB interface chip has the advantages of being high in data encryption and decryption speed, high in security, convenient to use and the like.

A method for measuring the static quality of FPGA software disclosed by the present invention aims to provide a method that can effectively reduce the number of verification tests and quantify the static test quality of software codes. The present invention is realized through the following technical solutions, including VHDL and Verilog In the FPGA software in different languages, the metric elements that reflect the value of software quality are screened out, and the FPGA software metric elements are classified and weighted; the evaluation rule sets that reflect a wide coverage and high degree of influence are selected, and the relevant weighting coefficients of the metric elements are extracted. Determine the severity of the impact, determine the number of evaluation metrics, and establish the analysis metrics and FPGA software quality evaluation model and rule set classification appendix table; according to the fault statistics of the reference standard GJB 2423A, calculate the total number of metrics A and the metrics and The specified metric element score is used to calculate the total number of metric element defects and the evaluation rules to give the metric evaluation result.

The invention provides a real-time simulation system oriented to a space-borne electronic system, relates to a simulation system, and aims at solving the problems of low simulation efficiency and poor adaptability of the conventional real-time simulation system oriented to a space-borne electronic system. The system comprises a test vector unit, a design simulation verification unit and a network control unit, wherein the test vector unit is used for introducing or establishing a system vector model, and simulating and verifying test input data of a VHDL (very-high-speed integrated circuit hardware description language) entity, and calculating and verifying output data of the VHDL entity; the design simulation verification unit is used for introducing in the VHDL entity, establishing an engineering file to be simulated and verified, controlling or calculating the input data of the network control unit, and outputting the result to the test vector unit through the network control unit; and the network control unit is used for controlling the whole simulation process through a network. The real-time simulation system oriented to the space-borne electronic system is suitable for real-time simulation of the space-borne electronic system.

The invention relates to a computer board card of a CPCI (Compact Peripheral Component Interconnect) framework, in particular to a standard bus interface module based on a MIL-STD-1553B protocol, namely, a plane internal time-division system command/response multipath transmission data bus interface module, which is widely applied to plane comprehensive avionics systems and external store management and integration systems, and gradually expands to plane control systems and the like as well as the fields of tanks, ships, spaceflight and the like. The MIL-STD-1553B protocol is realized through an FPGA (Field Programmable Gata Array); coding and decoding of a Manchester code are realized by using a VHDL (Hardware Description Language); a reasonable small-sized bus driving circuit is designed according to the MIL-STD-1553B protocol; a DSP (Digital Signal Processor) program which can support the protocol is written, and an assembled interface assembly function is realized. Due to the adoption of the interface board card, the design requirement of small size is met, functional expansion can be performed easily as required, using flexibility is realized, and the development cost of a product is much lower than that of a foreign special interface chip.

A system and method for manipulating waveforms, including transaction cancellation, in parallel time-warp simulation of circuits, such as those modeled in VHDL. Events waveforms for each output of a processor are organized by the simulation time (ST) of the events which created them and by the simulation time (RT) at which they are to be effective. A phantom buffer provides a linked list of events and associated transactions cancelled as a result of insertion of a new event in said chain of events. Rollback of a cancelled event waveform is done by restoring to the linked lists selected events and transactions from the phantom buffer.

A method of synthesizing a CRC generator circuit for generating optimized code written in a high level hardware description language such as VHDL. The hardware description language code for implementing a CRC generator circuit has significantly less delay and utilizes fewer gates than prior art CRC generator circuit synthesis techniques. The method is operative to generate VHDL code which is then used to synthesize the circuit. The method iteratively generates the remainder equations for a CRC generator given the generator polynomial. During each iteration of the software, duplicate terms in each remainder equation are eliminated. The number of iterations is equal to the number of data bits the CRC generator is to process during each clock cycle. Once all the duplicate terms in the remainder equations are removed, the equations are sorted, rebuilt and translated into hardware description language code such as VHDL. The resulting optimized code may then be synthesized.