175 results about "Boundary scan testing" patented technology

Systems and methods for providing a boundary scan test of a wired or wireless network having a plurality of network nodes are presented. The system includes a test station communicatively coupled with the network. The test station creates a MAC layer scan test route sequence that includes each link in the network and is independent of the routing mechanism and protocol used for the network. The test station also creates a test agent that is configured to traverse each link in the scan test route sequence. The test agent is then deployed on the network and information about a link is reported back to the test station after the test agent examines the link. The scan test route sequence can be created by sending out a series of broadcast messages from one or more nodes in the network, sequentially applying a network tour to cover the entire network, or performing a depth first search on the entire network.

A system for testing a high speed integrated circuit includes a test device having a test clock with a first maximum frequency for performing level sensitive scan design (LSSD) testing of the integrated circuit device under test, a frequency multiplier circuit for multiplying the test clock signal to a higher second frequency capable of operating the device under test, and a finite state machine for generating a first internal clock for testing the device under test. In a practical embodiment, the internal clock speed may be running at a frequency many multiples of the test clock. Alternatively, a method of testing a device under test (DUT) at design speed includes running a predetermined group of tests with a test device operating at a lower speed than the design speed; incorporating LSSD or boundary scan test techniques in the device under test, together with a frequency multiplying device; generating a global clock for the device under test from the frequency multiplying circuit and using a finite state machine as a synchronizer and pulse generator to control a capture clock with respect to the global clock.

The invention includes a method and apparatus for enabling multipoint bus access. In one example, the open ring-architecture bus includes a boundary scan bus including a plurality of bus access points adapted for interfacing with a plurality of circuit packs, a first termination circuit coupled to a first end of the bus, and a second termination circuit coupled to a second end of the bus. The first termination circuit and second termination circuit are adapted for terminating signaling on the boundary scan bus. The open-ring architecture bus provides a master circuit pack a multipoint access capability such that the master circuit pack may be disposed at any of the plurality of bus access points. In one example, signaling includes signaling operable for performing hierarchical system testing, including boundary scan testing. In another example, signaling includes upgrade signaling operable for performing firmware upgrades, software upgrades, and like circuit pack upgrades.

A semiconductor device provided with a compact Boundary-Scan test circuit is shown. The Boundary-Scan test circuit comprises a Boundary-Scan test register which is composed of bit elements serially connected to each other in the form of a scan path and each of which is connected respectively to one of pads of the semiconductor device, wherein part of the bit elements of said Boundary-Scan test register functions also as an ID-Code register while an initial bit element of said Boundary-Scan test register functions also as a bypass register for bypassing the subsequent bit elements of said Boundary-Scan test register.

Circuit testing equipment comprising a computer (110) having stored thereon a boundary scan description language (BSDL) file (111), a netlist (112) and a connections list (113). An adapter (105) connects the computer to a boundary scan bus of a circuit (120) to be tested. The computer is arranged to parse and compile the BSDL file, the netlist and the connections list to generate a data structure which, when combined with a test script (114), permits execution of the test script from the computer through the boundary scan bus. The test script can be IC-specific such that it is valid for a particular IC independent of the circuit in which the IC is located.

The integrated circuit boundary scanning measurement device is used in measuring integrated circuit on printed circuit board in communication electronic technology. The boundary scanning measurement device utilizing the parallel port of computer includes bottom interface module, initializing module, measurement vector producing module, measurement module, fault analyzing and locating module, and boundary scanning describing language file analysis module. Boundary scanning measurement is completed via making full use of the PC resource, i. e., compiling PC boundary scanning application program, utilizing the parallel port in PC and assisting with the JTAG interface hardware unit. The present invention can complete the boundary scanning measurement of devices in printed circuit board and the whole printed circuit board. The present invention can raise the measurement capacity of printed circuit boards.

Techniques are provided for capturing external signals at output pins on a programmable logic integrated circuit (IC) during a boundary scan test. A JTAG sample signal is routed to an input/output block on a chip and active during a JTAG sampling phase. An input buffer coupled to an output pin is turned on during the JTAG sample phase. Logic gates enable the input buffer in response to the JTAG sample signal so that the input buffer can capture a signal on the pin. The input buffer is turned off after the JTAG sampling phase to conserve power. The output buffer coupled to the pin that receives the test signal is tristated to prevent contention during the JTAG sampling phase. The techniques of the present invention can be used to test board level interconnects in less time and are easy to implement.

This invention discloses multi-link testing devices and methods which can realize boundary scan. Including: PC module, boundary-scan test card and boundary scan card expansion card; described boundary-scan extended card composed by boundary scan expansion modules , used in a number of boundary-scan test link, through analytical sent from the PC port choice test configuration, boundary scan port expansion card on the number of boundary scan link together into a new boundary scan link , for testing. The invention through the boundary-scan test device provide to PC users easy-to-use interface, test vector generation and the analysis of test data, through PC hardware and procedures rapidly with good boundary-scan test and link extension, chains expansion is easy and convenient flexible scanning, reduced the frequency of chains replacement and increase test coverage and achieve program simple, economical and practical.

The invention discloses a controller and testing method of boundary scanning, said controller includes PC unit, USB interface unit, two-end memory unit, control and transforming unit; said PC unit can set test, generate test vector, send and receive test data, analyze test data, store test result and USB drive of controller; said USB interface unit realizes communication between boundary scanning test controller and computer; said two-end memory unit realizes memory of test vector and stores test response; said control and transforming unit generates boundary scanning test clock to realize transforming test data to JTAC signal, and realizes reading and writing of data from two-end memory unit. The invention adopts USB interface, memory of two-end memory unit and FPGA design, plug and play, data transmission and boundary scanning test can be preceded at the same time, test speed is increased.

An area for layout of a plurality of I/O cells (called an “I/O area”) is provided in the peripheral portion of a chip and signal wirings for transferring test signals to the I/O cells are provided in the layout direction of the I/O cells. At least one empty cell provided in the I/O area at a position where I/O cells are not provided has a repeater circuit which constitutes a transfer path for the test signal. The repeater circuit receives the test signal and outputs the test signal. This structure provides a suitable semiconductor integrated circuit device adaptable for an ASIC or the like, which can adjust the delay of a test signal to be transferred along the chip's peripheral portion by suppressing an increase in the delay and degradation in waveform depression.

A method and system for testing circuit clusters in a boundary scan environment identifies the circuit clusters and corresponding neighboring boundary scan elements, and generates one or more test vectors to be applied to the cluster under test. The generated test vectors are serialized and input into an identified boundary scan element connected to the cluster being tested in the form of a boundary scan test chain. The output of the applied test vectors is observed from an output of another correspondingly identified boundary scan element connected to the cluster under test. During generation of test vectors a list of faults for detecting by each generated vector is maintained such that the observed output can be used to diagnose faults at the component level within the identified cluster.

The invention discloses a multi-link parallel boundary scanning testing device and method. The device comprises a testing controller and scanning control units which correspond to boundary scanning chains to be tested one by one, wherein each scanning control unit comprises a multi-link control logic and test data input port, a test result output port, a controller interface and a boundary scanning chain interface. The method comprise the following steps: (1) the testing controller transmits an invalid signal, and detects the quantity of all boundary scanning chains to be tested which are arranged in parallel; (2) the testing controller sets a scanning selection code, and transmits the scanning selection code to each scanning control unit; (3) the testing controller outputs a valid signal, and the scanning control units control the selection and switch-off of the boundary scanning chains to be tested according to the scanning selection codes; and (4) the test controller outputs boundary scanning test data, and the scanning control units test the selected boundary scanning chains to be tested and transmit a final test result to the testing controller. The device and the method have the advantages of high testing efficiency, and easiness and convenience for using.

The invention discloses a simple boundary scan test system based on a single-chip microcomputer. The simple boundary scan test system comprises a control platform, a USB-to-serial port conversion circuit and a JTAG control circuit, wherein the control platform is used for transmitting TMS signals and TCK signals to a tested chip, controlling the tested chip to enter the corresponding working state, and receiving TDO signals output by the tested chip; the USB-to-serial-port conversion circuit is used for receiving USB bus signals output by the control platform, converting the USB bus signals into TMS signals and TCK signals in the serial data format and outputting the TMS signals and the TCK signals to the JTAG control circuit and also used for receiving TDO signals in the serial data format output by the JTAG control circuit, converting the TDO signals into the USB bus signals and outputting the USB bus signals to the control platform; the JTAG control circuit is used for receiving TDO signals output by the tested chip and outputting the TDO signals to the USB-to-serial port conversion circuit. The boundary scan test system is simple in structure and low in cost; the control platform of the system is independently developed, and thus the system is good in safety, and function extension is convenient to perform; the system is good in universality.

A test cell (12) provides boundary scan testing in an integrated circuit (10) The test cell (12) comprises two memories, a flip-flop (24) and a latch (26), for storing test data. A first multiplexer (22) selectively connects one of a plurality of inputs to the flip-flop (24). The input of the latch (26) is connected to output of the flip-flop (24). The output of the latch (26) is connected to one input of a multiplexer (28), the second input to the multiplexer (28) being a data input (DIN) signal. A control bus (17) is provided for controlling the multiplexers (22, 28), flip-flop (24) and latch (26). The test cell allows input data to be observed and output data to be controlled simultaneously.

The invention discloses a boundary scan digital circuit test system and a test method thereof based on a PXI bus. The test system comprises a PXI backboard, a main controller, a JTAG controller, 1-N interface expansion modules, 1-M function expansion modules and an adapter board. The PXI backboard is connected with the main controller, the JTAG controller, the interface expansion modules and the function expansion modules; the adapter board is connected with the main controller, the JTAG controller, the interface expansion modules and the function expansion modules; and the main controller is connected with a keyboard and a mouse of a computer through a USB interface, and is connected with a displayer of the computer through a DVI. The boundary scan digital circuit test system has an advanced framework and high expandability, can solve the problem that since the existing test equipment is highly targeted, boundary scan test and function test are incompatible, and system test cannot be realized, and can be served as a general development platform. The invention also discloses the test method of the boundary scan digital circuit test method based on the PXI bus.

The invention provides a testing system and method suitable for determining whether a pin-out of an electrical component is properly connected to a PCB. The testing system includes a testing signal source, a signal detector, a signal processor, an analysis unit and an integrated circuit having boundary-scan test function to provide testing signals to the device under test (DUT) whose signal traces are passing through inner layer of PCB in order to detect whether the sensed signal is an error signal.

An object of the invention is to provide a boundary scan controller that allows a boundary scan to be executed and also allows a semiconductor apparatus to be manufactured in such a manner that the same type of semiconductor circuit chips are stacked. When identification data stored in memory means (85) is compared with fixed data held in fixed-data holding means (87) by comparison means (88) and the identification data is coincident with the fixed data, a data derivation section (89) outputs the same data as data which is outputted from an output section (86). In a boundary scan test, a data derivation section (89) of a boundary controller (80) provided for each semiconductor circuit chip is connected to the same bus line. When the identification data is not coincident with the fixed data, the data derivation section (89) can be substantially disconnected from the bus line. In this way, the same type of semiconductor circuit chips for which the boundary controller (80) is provided can be stacked, thereby manufacturing the semiconductor apparatus.

The invention discloses a boundary scanning test system, which comprises test equipment, an external interface, a microprocessor, a gating circuit, a plurality of I/O (Input/Output) driving interfaces and a plurality of JTAG (Joint Test Action Group) bus interfaces used for connecting devices to be tested. The test equipment is connected with the microprocessor through the external interface, the microprocessor is connected with the plurality of I/O driving interfaces through the gating circuit, each I/O driving interface is correspondingly connected with one JTAG bus interface, and the microprocessor is connected with the plurality of I/O driving interfaces. The invention also provides a boundary scanning test method. The boundary scanning test system and the boundary scanning test method can simultaneously test a plurality of devices to be tested so as to improve the test efficiency.

A semiconductor device constructed by mounting a plurality of chip intellectual properties (IPs) on a common semiconductor wiring substrate, a method for testing the device and a method for mounting the chip IPs. A silicon wiring substrate on which chip IPs can be mounted is provided. A circuit for a boundary scan test is formed on the silicon wiring substrate by connecting flip flops. The flip flops are connected to wiring and are arranged to test connections in the wiring. The entire IP On Super-Sub (IPOS) device or each chip IP may be arranged to facilitate a scan test, a built-in self-test (BIST), etc., on the internal circuit of the chip IP.

Methods and apparatus for testing Input/Output (I/O) boundary scan chains for Systems on a Chip (SoCs) having I/Os that are powered off by default. Some methods and apparatus include implementation of boundary scan chain bypass routing schemes that selectively route a boundary scan chain path around I/O interfaces and/or ports that are powered off by default. Other techniques include selectively power-on I/Os that are powered off by default in a manner that is independent of SoC facilities for controlling the power state of the I/Os during SoC runtime operations. Various schemes facilitate boundary scan testing in accordance with IEEE Std.-1149.1 methodology.