[Technology Report]
Dev Kits Help Alleviate Those FPGA Design Woes
The latest crop of FPGA Kits brings novice FPGA designers up to speed much more quickly.
Design at the logic level for board-level products is rare. If it can’t be done with a microcontroller or two, then what’s a designer to do? FPGAs have been the answer for years, but FPGA tools required a steep learning curve. Likewise, FPGAs had a price premium and high power requirements, and external support requirements often proved challenging.
All of that has changed, though. Inexpensive FPGAs are now the norm. High-performance products remain pricey, but the bang for the buck is even higher. Low power has been the mantra for micros, and the same is true for FPGAs. Moreover, supporting an FPGA these days is a relatively simple design exercise.
That leaves the learning curve, where major improvements in FPGA development tools have made a significant difference. FPGA tool designers have been pressed to provide FPGA experts with the required functionality while delivering an interface that won’t send novices screaming for the exits.
So, the next challenge involves connecting the tools to the hardware, which can be met by combining the tools with a development board in a kit. These kits have been around since FPGAs first arrived, but the latest crop no longer leaves designers hanging with just development tools and a bare FPGA with a few LEDs and switches for peripherals.
Targeted kits now come with peripherals, such as digital cameras, and firmware and software to match. Some target soft-core solutions (see “FPGAs Pushing MCUs As The Platform Of Choice” at www.electronicdesign.com, ED Online 19149), where software developers can join the fray with FPGAs already programmed with soft or hard cores plus the accompanying peripherals and even operating systems. ARM’s own Cortex-M1 Development Kit targets Altera’s Cyclone III FPGA. The Cortex-M1 soft core is license-fee free on Altera’s line of products.
Still, designers need to consider their requirements and options. FPGA kits under $50 open FPGA development to virtually any designer, but beware the fine print, especially when it comes to software. The 30-day cutoff for some tools isn’t nearly enough time to even move up the learning curve, let alone design a new product.
Similarly, free tools often lack the more advanced features of their premium-priced cousins. Software modules, middleware, and other intellectual property (IP) may also have hidden costs when it comes to actual deployment.
FPGAs FROM THE SOURCE Development kits are tools to get companies to buy more FPGAs. As a result, it’s no surprise that major FPGA vendors such as Actel, Altera, Lattice Semiconductor, and Xilinx all provide a range of kits that highlight their various offerings. A host of third parties provides kits as well. For extensive hands-on reviews of these kits, see Lab Bench Online at www.electronicdesign.com.
The Spartan-3A DSP Edition of the Xilinx XtremeDSP video starter kit is a good example of a targeted kit (Fig. 1). The Micron VGA CMOS video camera with tripod has an RJ-45 connector for video signals, while another RJ-45 connector on the Spartan-3A DSP 3400A board provides Ethernet access.
The board is representative of higher-end solutions with expansion capabilities. In this case, there are two FPGA mezzanine card (FMC) slots. One is populated with Xilinx’s Xtreme DSP FMC card with a pair of camera RJ-45 connectors in addition to video output connectors, including S-video, composite video, and digital video interface (DVI).
As with most FPGA development kits, the XtremeDSP kit includes quite a bit of software, including Xilinx’s Integrated Synthesis Environment (ISE), Embedded Development Kit (EDK), and System Generator for DSP. The full-blown ISE is good for only 60 days, but the slightly less functional WebPack version doesn’t expire.
The 128-Mbyte compact-flash memory card comes programmed with the System ACE boot image, so it’s ready to run out of the box. System ACE, which addresses system- level configuration, can handle multiple configurations. It also supports software storage encryption.
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