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The following page content corresponds to the products formerly marketed by NEC Electronics
Links
These provides beneficial information for designing USB system with NEC USB controllers.
USB Technical Overviews
For basic information of USB technologies, refer the USB Technical Overview, including USB-IF, Microsoft and Intel site.
Reference Design and Peripheral Devices
For Crystal OSC, NEC asked following Company that fixed parameters on our Reference Design.
In the system validation, NEC could not found any EMI problems even without the Common Mode Chokes. But EMI will be generated cause of PCB patterns, electric parts and its installation. NEC has evaluated for the system cooperated with the company as following,
TDK CMF (common-mode filter) Application Note for USB2.0
*TDK is a registered trademark or trademark in Japan and other countries.
Debugging USB and Wireless USB
In the first step of developing USB system, it is important to debug and analyze the electricity problems; noise, disorder of signaling waveform, critical fault of packet sequence. As well as developing USB system software driver, very important to confirm if the packet issues or respond as exact timing. NEC are going to develop our products with the following Maker's analyzer, scopes.
LeCroy Corporation is the second largest digital oscilloscope manufacturer in the world and acquired Computer Access Technology Corporation (former CATC) in October 2004. LeCroy provides total solutions for USB and other serial data analysis from physical to application layer such as Serial Data Analyzer(SDA) and protocol analyzers.
Ellisys is a Test & Measurement company committed to the design and timely introduction of advanced protocol analyzers for USB, Wireless USB and WiMedia Ultrawideband. By providing hardware, firmware, software and test engineers with the right tools at the right time, Ellisys enables markets to grow in a secure and confident manner, and ensures a rapid and wide acceptance of these technologies.
USB Compliance
Designed USB products must be passed through USB-IF's "Compliance Program". ( The products which has "passed", will get "LIPS" advantage.)
In order to complete the USB Compliance Program, there is two way of examination, one is to participate to "Plug Festa" event, and another is to get a commission by "Test Labs" for your products. "Plug Festa" will be held 3 or 4 times in every year, but it cannot always participate to the event as the number of companies which can participate is restricted.
Test site always is received the compliance test works with a fee.
11KB)National Technical Systems, INC.
USB 2.0 Driver for Embedded OS
For more detail, see to the USB 2.0 Driver page
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