Interlink Electronics

<p>CALL (732) 774-8502EETInfo No. 622 </p>

The PSL99004 is priced at less than $500 each in lots of 100 pieces.

The core will consist of real-time functionality that addresses the needs of common real-time applications. In particular, they will provide services of the sort that are typically provided by commercially available real-time operating systems. The intent is that the core implement a subset of the full NIST requirements. The remaining requirements are to be addressed by the higher-level profiles that supplement the core.

A profile consists of a set of related functionality that is useful to be added on top of the common core. Examples of possible profiles include safety-critical, fault-tolerant and distributed real-time. It is possible that in some cases profiles will be mutually exclusive. For example, it may not be possible to install the safety- critical profile in the same core execution environment that is also running the distributed real-time profile.

QMSS-078-01-L-D-EM2-PC8_Datasheet PDF

The J Consortium, a group of companies that shares a common interest in advancing the art of real-time programming with the Java language, has worked on specifications to address the NIST requirements. These specifications were formed with the goal of achieving latency and throughput for programs written in the real-time core to be comparable to those written in C++. More details are available at Sun Microsystems Inc. also formed a Real-Time Experts group in February to work on the specifications for teal-time extensions for the Java platform.

Neither the semantics nor the implementation of vanilla Java”-a term used here to refer to Java as it has been defined and distributed by Sun Microsystems-are appropriate for real-time programming. However, it is not practical to redefine the semantics of vanilla Java to make it more appropriate for the specialized needs of the real-time community. One key obstacle is the huge amount of legacy Java code that would be broken by changes to the definition of vanilla Java.

Another obstacle is that changing vanilla Java to make it support real-time would likely make it more difficult for non-real-time users to program in Java.

QMSS-078-01-L-D-EM2-PC8_Datasheet PDF

Programming for the real-time core execution environment is like programming in Java. Programmers can use traditional vanilla Java development tools and express core concepts using stylized Java,” which can be compiled by a standard Java source-code compiler. A special real-time core style verifier” checks the class file for conformity with the real-time specifications.

Programmers can alternatively use specially designed real-time core development tools that integrate the functionality of traditional vanilla Java development tools with the real-time core style verifier. In this case, they would express core concepts using syntactic core” constructs.

QMSS-078-01-L-D-EM2-PC8_Datasheet PDF

There is no syntax to distinguish core classes. In a dynamic core execution environment, a special vanilla Java service allows vanilla Java components to cause core classes to be loaded and executed. In a static core execution environment, a static Java component integrator builds a memory image in which certain preloaded classes have been identified as core classes. All instances of core classes are core objects.

The real-time core domain is designed for real-time programming, offering well-defined task behaviors, improved latency and throughput, small memory footprints, priority inversion avoidance schemes and availability of appropriate signaling and synchronization techniques. Considerable rework is currently required to port real-time software components to new architectures and even to upgrade between processor families. The real-time core alleviates this problem by allowing programmers to write portable device driver software.

BI Technologies also introduced a batch of surface-mount inductors this year. The company has extended its HM76 series of SMT inductors to include five case sizes and up to 15-A rated power. The inductance rating is 1 to 1,000 mH. Applications include notebook computers, PDAs, DC/DC converters for handheld equipment, battery-charging circuits, and EMI filters.

BI is also offering the HM78 series of shielded surface-mount inductors with an inductance range of 10 to 1,000 mH. The devices are compatible with both vapor-phase and infrared reflow soldering.

They can be used in a variety of general-purpose applications as well as notebook computers, PDAs, and DC/DC converters in distributed-power systems, and handheld equipment.

Vishay is providing high-frequency (high-Q) chip inductors using photolithographic processes. The IFC-0603 has an inductance range of 1.5 to 18 nH, and Qs are typically 50 at 1,700 MHz and 37 at 800 MHz. The IFC-0805's inductance range is 1.5 to 47 nH, with Qs of 65 at 1,700 MHz and 48 at 800 MHz. The devices measure 9.53 x 6.5 x 1.19 mm.

Vishay's proprietary photolithography construction improves stability and precision of manufacturing and reduces overall cost compared with standard thin-film construction, according to the company.

I am not anticipating loving these things initially, especially in a bolt-on aftermarket setting. They're just another distraction for drivers,” said Frank Markus, technical director of Car and Driver magazine. When the car companies do it in a totally integrated fashion, then it may be OK.”

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