MATLAB: Buffer quivalent block in HDL coder

buffer equivalent block

I am using buffer block in simulink model to store 512 samples of fft output,but this buffer block is unsupported for hdl code generation.so what is buffer equivalent block in HDL coder for hdl code generation. i have tried to use 'DESERIALIZER 1D' block in place of buffer then it is showing an error that "Illegal block in enabled subsystem",how to fix this error

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I am attaching snap of my simulink model and error. plz suggest how to fix this error
Simulink Block   Warnings/Errors
hdl_fft_ipcore/PFB Spectrum Viewer/BitRevOrder   Error: Block 'hdl_fft_ipcore/PFB Spectrum Viewer/BitRevOrder' is unsupported for HDL code generation when in native floating-point mode.
hdl_fft_ipcore/PFB Spectrum Viewer/Buffer   Error: Block 'hdl_fft_ipcore/PFB Spectrum Viewer/Buffer' is not supported for HDL code generation. To continue with code generation, comment out this block.
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