USB port interfacing project information ( 20 ) :

• Beyond Logic Universal Serial Bus Development Information - Information on USB ICs, pint-to-point connectivity, USB-RS232 interfacing and USB-I2C interfacing.   
• Buttons for USB HID Devices - USB Human Interface Device Class design information   
• Cypress Semiconductor Universal Serial Bus (USB) Application Notes - application notes for low-speed USB interfacing   
• Cypress Semiconductor Universal Serial Bus (USB) Application Notes - application notes for full-speed USB interfacing   
• Hints and kinks for USB decoding - At PC-accessible USB receptacle and at the peripheral receptacle, the USB signal has the format of differential-NRZI (nonreturn-to-zero-inverted) code. After conversion (with a simple circuit or test probes) of this differential to single-ended signal, the signal becomes a waveform that assumes the voltage levels used to recognize ones and zeros in computer code.   
• Inside USB 2.0: what the new spec means for developers - Is updating to 2.0 worth it? USB-peripheral designers need to know what changes in the spec mean and how the interface handles the challenge of supporting higher data rates while still allowing low- and full-speed devices on the bus.   
• Low Cost Smart Connector Marries RS-232 To Universal Serial Bus - information on USB to RS-232 converter product using FT8U232AM chip, article includes full circuit diagram of the device   
• Taming the Universal Serial Bus - EDN's hands-on USB project gets the bus under control   
• Texas Instruments USB Specification   
• Universal Serial Bus Links - description, organizations, IC manufacturers, connector specifications, cable and software   
• Universal Serial Bus and Game Devices - Universal Serial Bus (USB) is an external PC bus that provides an exciting way to add high-speed game devices to a PC. The Microsoft?� DirectInput? application programming interface (API) provides an interface that game developers can use to get fast, consistent direct access to game devices, including USB devices and analog and digital joysticks. This article has general information and links to resources.   
• Universal Serial Bus Information - This page has basic USB introduction, OS support information, general information on making your own USB devices and links to USB peripheral chips.   
• Universal Serial Bus Implementers Forum Home Page   
• USB and the Differences Between OCHI and UHCI - white paper from   
• USB Central - links to information about USB and sample code to download   
• USB Design by Example - selected USB documents from Intel   
• USB Human Interface Device (HID) Related Specifications   
• USB Plug and Play IDs and Selecting Device Drivers to Load - This paper describes how the Microsoft?� Windows?� 98 operating system (OS) selects USB device drivers to load, based upon the matches between device IDs that bus drivers read from descriptors on the USB devices and Hardware IDs and Compatible IDs in system INF files.   
• Using the HID class eases the job of writing USB device drivers - The difficulty of writing device drivers is one of the major barriers to the adoption of the USB. The USB HID class is a powerful and versatile way to get your device on the USB. If your USB device can exist within the bandwidth limits of the HID driver, then using this driver may save your sanity and your schedule.   
• USB Specifications and Developer Section   

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