They used only logic gates (no flip-flops), thus allowing only the implementation of combinational circuits. The first PLDs were called PAL (Programmable Array Logic) or PLA (Programmable Logic Array), depending on the programming scheme (discussed later). In other words, a PLD is a general purpose chip whose hardware can be reconfigured to meat particular specifications. However, contrary to microprocessors, which can run a program but posses a fixed hardware, the programmability of PLDs was intended at the hardware level. The idea was to construct combinational logic circuits that were programmable. ** Error: D:/FYP_extra/fir_fft/fir_fft_two/my_fft.Programmable Logic Devices (PLDs) were introduced in the mid 1970s. ** Error: D:/FYP_extra/fir_fft/fir_fft_two/my_fft.vhd(35): (vcom-1136) Unknown identifier "fft_lib". ** Error: D:/FYP_extra/fir_fft/fir_fft_two/my_fft.vhd(34): Library fft_lib not found. # compile of my_fft.vhd failed with 1 errors.
** Error: D:/FYP_extra/fir_fft/fir_fft_two/fir_compiler-library/auk_dspip_lib_pkg_fir_90.vhd(1): VHDL Compiler exiting
** Error: D:/FYP_extra/fir_fft/fir_fft_two/fir_compiler-library/auk_dspip_lib_pkg_fir_90.vhd(1): near "": illegal character found in source ** Error: D:/FYP_extra/fir_fft/fir_fft_two/fir_comp_ast.vhd(36): VHDL Compiler exitingĬompile of fir_comp_ast.vhd failed with 1 errors. ** Error: D:/FYP_extra/fir_fft/fir_fft_two/fir_comp_ast.vhd(33): (vcom-1136) Unknown identifier "auk_dspip_lib". ** Error: D:/FYP_extra/fir_fft/fir_fft_two/fir_comp_ast.vhd(32): Library auk_dspip_lib not found. However modelsim has given some compilation errors as follows: I have basically added every hdl files inside I have even added some vho files (maybe they are not necessary). Then I connected the FIR and FFT in SOPC builder, between them I put a Dual Clock FIFO, then the following hdl files are created:įir_fft_two_sopc.vhd (fir_fft_two_sopc is the name of my sopc system)įir_fft_two.vhd (instantiation of my SOPC system)Īt this moment, I have tried myself. Then the following hdl files are created: I first created an FIR and an FFT using MegaWizard Plug-In Manager. Thanks for your help! Now the problem is that I don't know which files to put into my modelsim project.
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