Question: What is the use of the file dscr.a51 provided with EZ-USB development tools?
The file dscr.a51 is an assembly file that contains the descriptor table data. The descriptor data may include device descriptor, device qualifier descriptor, configuration descriptor, interface descriptors, and endpoint descriptors. These data will be arranged in a particular order. For more details, such as the order of the descriptors, see Appendix A and Appendix B of Technical Reference Manual, by opening C:\Cypress\USB\Doc\FX2LP\EZ-USB_TRM.pdf after installing CY3684 kit. You can also find the Technical Reference Manual at http://www.cypress.com/?rID=38232.