DE5-Net User Manual
June 20, 2018
52
on the FPGA as shown in
. Each component of the FPGA board is listed where users can
enable or disable a component according to their design by simply marking a check or removing the
check in the field provided. If the component is enabled, the System Builder will automatically
generate the associated pin assignments including the pin name, pin location, pin direction, and I/O
standards.
Note
: The pin assignments for some components (e.g. DDR3 and SFP+) require associated
controller codes in the Quartus project otherwise Quartus will result in compilation errors.
Therefore, do not select them if they are not necessary in your design. To use the DDR3 controller,
please refer to the DDR3 SDRAM demonstration in Chapter 6.
Figure 3-4 System Configuration Group
Programmable Oscillator
There are two external oscillators on-board that provide reference clocks for the following signals
SFP_REFCLK, SFP1G_REFCLK, SATA_HOST_REFCLK and SATA_DEVICE_REFCLK. To use
these oscillators, users can select the desired frequency on the Programmable Oscillator group, as
shown in
. SPF+ or SATA should be checked before users can start to specify the desired
frequency in the programmable oscillators.
As the Quartus project is created, System Builder automatically generates the associated controller
according to users’ desired frequency in Verilog which facilitates users’ implementation as no
additional control code is required to configure the programmable oscillator.