User guide

Using the System
13
Figure 3.2 Set SW19 to RUN position for JTAG programming and normal
operation
3-2 Configuring the FPGA in AS Mode
The bitstream can be downloaded via Active Serial Programming mode (AS
mode). By default, the switch is set to the position of RUN for JTAG mode so that
the SOF bistream file is downloaded directly to the FPGA chip. AS Mode, where
POF bitstream is downloaded directly to the Flash-based Serial Configuration
device, should be used only when the design is finalized or the design has to be
tested without a PC. Set the switch to PROG for AS mode. Note that the switch
position should be kept at RUN position for normal operation. Figure 3.3 shows the
AS mode connection scheme. Perform the following steps to program in AS mode:
 Ensure the 9V power is supplied to DE2 Board.
 Connect USB Cable to the USB Blaster Port of DE2.
 Set the Switch (SW19) to “PROG” position.
 Now users can use AS mode to configure FPGA using POF file. The
connection is shown in Figure 3.3.
 Once the POF bitstream downloading is finished, you need to set the SW19
back to “RUN” position and reset (turn off and turn on) the power so that the
bistream can be loaded into FPGA from the Serial Configuration Device.
Figure 3.3 The connection and SW19 setup for AS mode programming