Fourier模块的缓冲区不够？？？

tujian510

最近仿真时老提示：
Warning: The specified buffer for block 'fangzhen1_11/Fourier/T1' was too small. During simulation, the buffer size was temporarily increased to 5120. In order to use Real-Time Workshop, you need to update the buffer size parameter.
大概的意思是Fourier模块的缓冲区不够，是什么意思呢？