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Tell me about JTAG/boundary-scan! Boundary-scan, also known as JTAG or IEEE Std. 1149.1, is a serial interface that gives access to the special embedded logic built-in into many of today’s integrated circuits (ICs). JTAG/boundary-scan provides a quick and easy method for testing electronic Printed Circuit Board Assemblies or PCBAs for manufacturing faults. It is also widely used for programming ICs such as cPLDs, FPGAs and flash memories on the circuit boards in production as well as after product manufacture if software/ firmware updates are needed.
Basic idea
The basic idea behind boundary-scan is that with internal cells you don’t need external probing access to the pin connections you wish to test. If you can drive the output pin of Device A using a built-in drive cell, and read the result on the input pin of Device B with a built-in sense cell, you can perform the desired test.
BSDL File The boundary-scan logic of a device is described in a single model file known as BSDL file (Boundary-Scan Description Language), which is also part of the IEEE 1149.1 standard. For every device type, the manufacturer of that device must provide a BSDL file. Using the description in this file software tools can analyze the boundary-scan logic in a device and automatically generate tests or other boundary-scan applications, such as device programming, for a PCBA
Applications The boundary-scan logic on a PCBA can be used for testing connections. Not only direct connections between boundary-scan devices, but also connections through transparent devices such as series resistors and buffers for example, as well as connections through logic gates. The presence of pull-up and pull-down resistors and connections to memory devices and microprocessor peripherals can also be tested
Hardware and Software
Hardware and software is needed to control the boundary-scan logic and drive data through the TAP (Test access port) and the registers in the chains. Special, advanced software can automatically generate JTAG/boundary-scan applications from CAD data and device models. A broad range of hardware and software tools is available with different capabilities and performance. This gives you the possibility to configure the boundary-scan solution that optimally fits the needs of your application area. For example tools for hardware debugging during prototype bring-up, testing and device programming in production, or repair and device re-programming for product upgrades in service.
Read more in depth For more in-depth information, download the white paper:
Panduit New OptiCam® 2 Fibre Optic Termination Tool
Panduit the enterprise and data centre physical infrastructure supplier announces the OptiCam 2 Termination Tool which is designed to offer 100% right first-time termination of OptiCam connectors. The tool calculates insertion loss value on completion of the camming process. The red and green light indicators provide additional visual confirmation of termination. Using the tool, installer productivity increases, and time spent on the job site is reduced. Project re- work time will also be decreased thus, helping contractors to improve overall profitability. The OptiCam 2 termination tool offers a step-by-step visual guidance and insertion loss calculation to ensure the field fibre and fibre stub are in proper
alignment before camming. This allows less experienced technicians to terminate fibre with confidence. A simple, ergonomic, and symmetrical design allows left or right- handed termination in both handheld and benchtop orientations. The tool is the most technologically advanced, feature rich option for field terminated connectors in enterprise applications.
www.panduit.com
44 September 2021
www.electronicsworld.co.uk
New Omron miniature switches ideal for wet or dusty applications
Omron Electronics Components Europe has announced two new fully sealed, miniature micro switches offering an exceptionally compact and flexible solution for applications exposed to water spray or high levels of dust. The D2GW and D2AW are ideal for vending machines, smart meters, EV charging stations, security systems, HVAC equipment, white goods and similar applications where space is at a premium. The new Omron D2GW is fully
sealed to IP67 and can operate in temperatures of up to 85°C. It is set apart by its exceptionally small size (8.3mm × 6.5mm × 5.3mm) and is potentially the smallest switch of its type in the industry. Omron is offering the D2GW in a wide variety of styles, with a choice of mounting structures, actuators and terminal specifications to maximise application flexibility.
http://components.omron.eu
The Global Display Chip Shortage is getting worse - what can CDS do to help you? The IC shortage is creating a lot of frustration and stress right now. It is no secret that a serious and significant imbalance between supply and demand exists right now for industrial displays, touchscreens, and computing hardware products, and it is almost impossible to accurately forecast when it will end and when the market will recover. It is well known that the market will probably have another 6-12 months of these issues, as the
demand will remain high and so the supply chain will remain constrained. Through their global network of warehouses and contacts, CDS can source products that other companies may not be able to. CDS will give you an honest representation of the market condition and propose the best solutions to help avoid any unnecessary delays.
Please visit
https://crystal-display.com/the-global-display-chip-shortage-is-getting- worse-what-can-cds-do-to-help-you/ for more information.
https://crystal-display.com/
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