USB programming and circuit guide

For many years, the USB devices from Cypress Semiconductor have been the "go to" devices for well documented and easy-to-implement USB interfaces. In fact, the Lattice USB download cable and several evaluation boards incorporate the CY7C68013A as the USB-to-JTAG interface. This device provides the JTAG interface from custom software that is executed by the embedded 8051 microprocessor core. The custom code is downloaded at enumeration (plugging the USB cable into a computer), which provides a very flexible solution. Recently introduced devices from Future Technology Devices International Ltd (FTDI) provide a viable alternate solution to the USB interface on the basis of size, cost, features and ease-of-use. This application note describes the features of the FT2232 with regard to programming and interfacing with Lattice Semiconductor's programmable devices.

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