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3.1.1 USB Register Space Address Map
USB Control/Status register
Module Id. and firmware version register
UDP protocol configuration register
USB VME Master Status/Control register
USB VME Master Cycle Status Register
USB VME Interrupt Status Register
USB Address/Data Test space:
Read Data = Read Address
USB Speed Test space:
Read Data = Speed Counter
The Speed Counter increments every 8ns (125 MHz)
The shorthand KA stands for key address. Write access with arbitrary data to a key address
initiates the specified function