Help - DDS Control in Virtex II

[jonathan]

Hi All,

I am not looking for an easier answer (unless one wants to offer it )
as I am looking for a good source to learn from or a place to begin looking
for answers.
I have a Xilinx Virtex II as part of the Xilinx ExtremeDSP Kit and I am
building a digital mixer as my first step in learning. My problem is this:
I need a program written in C++ to have control of the DDS frequency running
in the FPGA. I need to find an answer such as where is the memory or
register location going to be set in the fpga? Or, specific information
about how to use the ZBT ram as an interface between a C program and the
DDS? I am also using Xilinx System Generator if anyone is familiar with it.
Thanks for any pointers or information sources.

Jonathan
dodge318@tamu.edu

 

[MM]

"jonathan" <dodgepickup318@yahoo.com> wrote in message
news:c5iblt$e6e$1@news.tamu.edu...

Hi All,

I am not looking for an easier answer (unless one wants to offer it
)
as I am looking for a good source to learn from or a place to begin
looking
for answers.
I have a Xilinx Virtex II as part of the Xilinx ExtremeDSP Kit and I am
building a digital mixer as my first step in learning. My problem is this:
I need a program written in C++ to have control of the DDS frequency
running
in the FPGA. I need to find an answer such as where is the memory or
register location going to be set in the fpga? Or, specific information
about how to use the ZBT ram as an interface between a C program and the
DDS? I am also using Xilinx System Generator if anyone is familiar with
it.
Thanks for any pointers or information sources.

I don't know anything about the ExtremeDSP Kit, but generally speaking you
need to do the following:
1. Instantiate your DDS core in your design;
2. Add some registers that will be used for storing DDS parameters and
connect them to the DDS core;
3. Organize access to those registers from your host interface side (is it
PCI?);
4. Write your own or find an off-the-shelf kernel OS driver (such as
Windriver) that will talk to your board at the low level;
5. Write your C++ app that will talk to the board through the driver.

/Mikhail