User manual

Figure 18. LEDs.
Figure 19. DDR3 memory.
6. USB Controller
The USB interface performs two tasks:
 Programming the FPGA: There is no non-volatile FPGA configuration memory on the
Digital 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.