Is a single-chip SOC processor right for your embedded project?

David Beck, Symmetry Electronics

August 12, 2013

David Beck, Symmetry ElectronicsAugust 12, 2013

Today’s embedded solutions are driving higher performance applications in smaller form factors, from sophisticated industrial control and automation applications that require complex processing algorithms to digital signage applications that require high-performance graphics processing. These applications often require low power consumption and support for open standards in order to provide the highest levels of design flexibility. To enable these applications, developers need embedded processing platforms that deliver advanced performance while helping to reduce time-to-market and development costs.

New highly integrated system-on-chip (SOC) processors are available that feature a high-performance x86 multicore processor, a discrete-class graphics processing unit (GPU), an I/O controller, and error-correction code (ECC) memory support for high reliability – all on a single die. With increased chip-level integration, developers can achieve new levels of processing efficiency, while retaining a low power design and a significant footprint reduction to reduce manufacturing costs and minimize design complexity.

This article will describe the benefits, technology, and target markets for single-chip SOCs so developers can make informed decisions about whether this type of solution is right for their next embedded design projects.

Alternative solutions
Typical processing SOCs are comprised of one or more microcontroller or DSP cores, memory blocks, timing sources, peripherals, external interfaces, analog interfaces, voltage regulators, and power management circuits. The processor is usually powerful enough to run a Windows, Linux, Android, or RTOS operating system.

Traditionally, SOC processor architectures have not been widely utilized for graphics-intensive applications. For these applications, developers typically design a system whereby CPUs and GPUs are separate processing elements, and therefore they usually do not work together efficiently. Each has a separate memory space, requiring an application to copy data from the CPU to GPU and then back again. Additional chips are required to make a complete system.

The accelerated processing unit (APU), pioneered by AMD, is comprised of a low power CPU and a discrete-class GPU with a companion I/O unit in a two-chip architecture (Figure 1). The APU was the first step toward the realization of a new generation of SOC processors. APUs enable a large amount complex data processing more efficiently than either a CPU or GPU alone, but in a larger footprint than a single-chip SOC.

Figure 1: New generations of embedded SoCs targeting graphics incorporate a low power microprocessor with a dedicated graphics processor unit and a companion I/O acceleration unit.

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