Size Matters! How a System Perspective Slashes the Size of a USB 2.0 Device Core

USB 2.0 is a dramatic improvement over USB 1.1. Among other things, it's 40 times faster and has new flow-control features that use bus bandwidth more efficiently. Yet it's fully backward-compatible with existing USB 1.1 products. This combination of higher performance and broad compatibility almost guarantees that USB 2.0 will succeed in the marketplace - a market that has already embraced USB 1.1 in personal computers, peripherals, digital cameras, industrial equipment, and many other applications. For embedded-system developers, however, USB 2.0 presents new challenges as well as new opportunities. In engineering there's no such thing as a free lunch. The numerous improvements in USB 2.0 make an alreadylengthy specification even more difficult to understand and implement. That's why many developers prefer to license a USB 2.0 device core instead of laboriously creating their own core from scratch. A pre-verified core that drops into the design for an ASIC, SoC, ASSP, or FPGA can save months of development time. It can also simplify verification, conserve valuable engineering resources for product differentiation, and accelerate time to market.

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