## ADALM2000的USB控制
{{ :m2kusbsch.png |}}<WRAP centeralign>  USB部分电路原理图 </WRAP>
The USB interface performs two tasks:
  * **Programming the FPGA:** There is no non-volatile FPGA configuration memory on the Analog Discovery. The WaveForms software identifies the connected device and downloads an appropriate .bit file at power-up, via a Digilent USB-JTAG interface. Adept run-time is used for low level protocols. 
  * **Data exchange:** All instrument configuration data, acquired data and status information is handled via a Digilent synchronous parallel bus and USB interface. Speed up to 20MB/sec. is reached, depending on USB port type and load as well as PC performance.