RAM Mapping failed in HDL Coder

Hello all

I am using MATLAB 2013a HDL Coder along with Xilinx ISE 13.2. I am trying to implement MATLAB given HDL Example "Timing Offset Estimation", however,i am getting following warning during HDL Code generation:

"Warning: RAM mapping failed for variable, 'rBuf', because it has a non-scalar sub-matrix access"

Same type of problem also occurs for Example "LMS Filter: Noise Cancellation".

Kindly help me to solve this problem

Best Regards kalia

Answer 1

[Tim McBrayer]

The warning is just that; a warning. The generated code should be perfectly fine. The design will use distinct registers for each element of the MATLAB array instead of block RAMs. The examples you refer to are making array accesses to a non-scalar portion of a variable, according to the warning message. This access pattern prevents the array variable in MATLAB (rBuf, in the one case) from being mapped to a RAM construct in the HDL.