摘要:
A transconductance amplifier (620) includes four transistors each operating in saturation and strong inversion. A first transistor (622) has a first current electrode and a control electrode both receiving an input voltage, and a second current electrode coupled to a power supply voltage terminal. A second transistor (624) has a first current electrode, a control electrode coupled to the first current electrode of the first transistor (622), and a second current electrode coupled to the power supply voltage terminal. A third transistor (626) has a first current electrode for providing a negative differential current, a control electrode for receiving a bias voltage, and a second current electrode coupled to the first current electrode of the first transistor (622). A fourth transistor (628) has a first current electrode for providing a positive differential current, a control electrode for receiving the bias voltage, and a second current electrode coupled to the first current electrode of the second transistor (624).
摘要:
A system and methods are shown for performing a hardware performance analysis of graphics hardware and an application program. An application program generates a set of function calls. The function calls are translated to a native command set. The native command set is stored within a database. Software simulations and hardware emulations are used to compare the stored native command set data to a hardware architectural description of the graphics hardware. Data collected from the simulations are used to provide a performance model from which the performance of a graphics hardware executing commands for the application program can be determined.
摘要:
A method of mapping motion pictures experts group (MPEG) video information for improved efficiency is presented, wherein image information is stored in blocks of memory referred to as tiles. Tiles are mapped in memory so that adjacent tiles only correspond to different banks of memory. A method and system is provided for organizing and routing multiple memory requests from a plurality of clients to multiple memories. Requests from a plurality of clients, including a plurality of clients of the same type, such as multiple MPEG decoders, are directed to different memory controllers by a router. The memory controllers order the client requests by requests among similar client types. The memory controllers also order the client requests by different client types. The ordered requests are then delivered to memory. Returned data is sent back to the clients.
摘要:
A network for smart card applications using a smart card in combination with a smart card terminal. The network arrangement includes a communications network connected to at least one smart card terminal, and a central database server in operative communication with the network central office. The network central office is part of the public switched telephone network and transmits smart card data between the smart card terminal and central database server. The central database server includes many partitioned memory locations each containing information associated with a smart card application. The information contained in the partitioned memory locations is accessible by data pointers stored on the individual smart cards. In this manner, the amount of data stored on the smart cards using the system is reduced and all of the information relating to a smart card user is centralized in one location. The central database server includes means for distinguishing between public information and proprietary information stored in the partitioned memory locations.
摘要:
A system clock circuit that provides a high-speed reference clock signal for operating an integrated circuit. The system clock circuit comprises a frequency combiner circuit that receives a first external clock signal having a frequency F1 and a second external clock signal having frequency F2, where F2 is an integer multiple of F1. The second external clock signal is phase-shifted by P degrees with respect to the first external clock signal. The frequency combiner circuit generates from the first and second external clock signals a first output clock signal having an operating frequency that is the sum of F1 and F2. The system clock circuit also comprises a clock selection circuit that selectively applies the first output clock signal to the integrated circuit.
摘要:
A presence of a facsimile transmission tone generated by a calling party within a call is sensed for within a public telephone network before the call has been routed to a called party. If the facsimile transmission tone is present in the call, the telephone network denies completion of the call to the telephone line of the called party. If the call is absent the facsimile transmission tone, a telephone network switch is instructed to complete the call to the telephone line of the called party.
摘要:
A method and apparatus for qualifying a telephone transmission line for XDSL communication services is disclosed. The system includes a modem, located at the customer premises to be connected. The modem analyzes actual signals to determine the electrical characteristics of the communication channel associated with the customer premises. The modem includes a transmitter, receiver and controller to generate test signals and receive responses. The modem then analyzes the data to generate an output value indicative of the electrical characteristics of the communication channel being tested. This output value is then displayed to a user or transmitted over the communication channel to a network. The system thereby eliminates the necessity of dispatching a technician to test the telephone line, and provides more accurate test results than those achievable at the network-side of the connection alone.
摘要:
A system and method is disclosed for providing a pre-fetch memory controller in a computer system that comprises a plurality of master agents. The memory controller comprises a bus interface, a memory interface and a plurality of pre-fetch queues. In one embodiment each pre-fetch queue is assigned to a master agent. In an alternate embodiment the pre-fetch queues are dynamically assigned to master agents. The bus interface services memory read requests, memory write requests, and pre-fetch requests. Data may be pre-fetched from main memory and stored in the pre-fetch queues. This reduces the latency for memory read requests and improves the efficiency of the memory interface with the main memory.
摘要:
The disclosure generally relates to a system and method of processing and presenting data associated with telecommunication elements. In a particular embodiment, the system includes a first input to receive a first set of element management system data from a first element management system, a second input to receive a second set of element management system data from a second element management system, and integration logic to produce a combined set of data based on the first set of element management system data and the second set of element management system data. The system also includes data reformatting logic to produce a combined set of data having a common data format.
摘要:
Systems and methods are provided for testing a device. A test fixture is provided for interfacing a device with a host system for generating tests to be run on the device. The device is placed in a scan-test mode, according to a built-in self-test of the device. A scan clock signal and scan pattern are provided to allow scan-tests to be run on the device. If the device passes the scan test, the device is placed in a real-time test mode. At-speed tests may then be run on the device to provide a robust test and identify portions of the device that may be faulty.