Question: Where can I find a current Technical Reference Manual (TRM) for the obsoleted AN21xx (EZUSB)?
Answer: The contents of the obsoleted AN2131 DVK are included in the CY3681 FX2 Development Kit. They will be present in the default path C:\Cypress\USB after downloading and installing EZ-USB_devtools_version_261700.zip from this link in its default directory. The Technical Reference Manual (TRM) for the AN21xx (EZUSB) can be found in the path C:\Cypress\USB\doc\EZ-USB Series 2100
