EZ-USB Datasheet, PDF (118/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

6.15 Enumeration Note
The code in this example is complete, and runs on the EZ-USB chip. You may be wonder-
ing about the missing step, which reports the endpoint characteristics to the host during the
enumeration process. The reason this code runs without any enumeration code is that the
EZ-USB chip comes on as a fully-functional USB device with certain endpoints already
configured and reported to the host. Endpoint 2 is included in this default configuration.
The full default configuration is described in Chapter 5, "EZ-USB Enumeration and
ReNumeration™"
Portions of the above code are not necessary for the default configuration (such as setting
the endpoint valid bits) but the code is included to illustrate all of the EZ-USB registers
used for bulk transfers.
EZ-USB TRM v1.9
Chapter 6. EZ-USB CPU
Page 6-21