Multiply-Accumulator (MAC) Xilinx IP core always returns 0

[abraker]

Hi All,

I'm working with Labview 2014 for FPGA with cRio 9082 device. I'm trying to use the Multiply Accumulator Xilinx IP core. No matter what I try, the function always returns 0. Attached is a project file illustrating the issue. Note that there is also a simple Multiplier IP core in the example which is working properly.

The behaivior is the same in both simulation and after compilation.

Any idea what I'm doing wrong?

I tried to upload the project as a zip file, but I get an error message that it's contents don't match the .zip file extension. The minimal example can be found here:

 https://www.dropbox.com/s/317t6hhbdkrq6fj/MAC_project.zip?dl=0

Thanks!

Arnold

[ShamWOW!!]

Hello,

For these functions, I recommend looking at the documentation for these functions from the Xilinx website. Information like the following.

https://www.xilinx.com/products/intellectual-property/multiply_accumulator.html

What happens if you enable the bypass to be true for some rounds? Do you have some screenshots showing inputs and outputs of the function?

Best,

Shamik C

Applications Engineer 

National Instruments 

http://www.ni.com/support