Download Portable Electronics: World Class Designs by John Donovan PDF

By John Donovan

The entire layout and improvement idea and course an electronics engineer wishes in a single blockbuster booklet! John Donovan, Editor-in leader, transportable layout has chosen the superior digital layout fabric from the Newnes portfolio and has compiled it into this quantity. the result's a publication protecting the gamut of digital layout from layout basics to low-power methods with a powerful pragmatic emphasis. as well as particular layout recommendations and practices, this booklet additionally discusses numerous ways to fixing digital layout difficulties and the way to effectively observe concept to genuine layout initiatives. the fabric has been chosen for its timelessness in addition to for its relevance to modern digital layout concerns. Contents: bankruptcy 1 procedure source Partitioning and Code Optimization bankruptcy 2 Low energy layout ideas, layout method, and instruments bankruptcy three System-Level method of power Conservation bankruptcy four Radio verbal exchange fundamentals bankruptcy five purposes and applied sciences bankruptcy 6 RF layout instruments bankruptcy 7 On reminiscence platforms and Their layout bankruptcy eight garage in cellular client Electronics units bankruptcy nine Analog Low-Pass Filters bankruptcy 10 classification A Amplifiers bankruptcy eleven MPEG-4 and H.264 bankruptcy 12 Liquid Crystal monitors *Hand-picked content material chosen by means of John Donovan, Editor-in leader, moveable layout *Proven most sensible layout practices for low-power, garage, and streamlined improvement *Case histories and layout examples get you off and working in your present undertaking

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4 System Guidelines for Choosing Between DMA and Cache Let’s consider three widely used system configurations to shed some light on which approach works best for different system classifications. 1 Instruction Cache, Data DMA This is perhaps the most popular system model, because media processors are often architected with this usage profile in mind. Caching the code alleviates complex instruction flow management, assuming the application can afford this luxury. This works well when the system has no hard real-time constraints, so that a cache miss would not wreak havoc on the timing of tightly coupled events (for example, video refresh or audio/video synchronization).

While the core is operating on one section of memory, w ww. c o m System Resource Partitioning and Code Optimization 29 the DMA is bringing in the section to be executed next. This scheme is commonly referred to as an overlay technique. While overlaying code into L1 instruction memory via DMA provides more determinism than caching it, the trade-off comes in the form of increased programmer involvement. In other words, the programmer needs to map out an overlay strategy and configure the DMA channels appropriately.

This introduces loop-carried dependencies. This means avoiding loop array writes of the form: for (i ϭ 0; i Ͻ n; ϩϩi) a[i] ϭ b[i] * a[c[i]]; /* has array dependency*/ 5. Make sure that inner loops iterate more than outer loops, since most optimizers focus on inner loop performance. 6. Avoid conditional code in loops. Large control-flow latencies may occur if the compiler needs to generate conditional jumps. As an example, for { if { ….. } } 7. Don’t place function calls in loops. This prevents the compiler from using hardware loop constructs, as we described earlier in this chapter.

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