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Compiling XILINX's SIMPRIMS Library

1. First some of the code of the library needed to be changed.
   The attribute VITAL_LEVEL0 has to be right after the architecture:
   architecture X_MULT18X18_V of X_MULT18X18 is
   --Pini
   --first declaration must be the VITAL attribute specification
   attribute VITAL_LEVEL0 of X_MULT18X18_V : architecture is true;
   --Pini
2. Some starnge initialization has to be removed:
   --Pini
   can't explain this init and it does not compile with ghdl
   variable Write_A_Write_B : memory_collision_type ;--:= Write_A_Write_B;
   variable Read_A_Write_B : memory_collision_type ;--:= Read_A_Write_B;
   variable Write_A_Read_B : memory_collision_type ;--:= Write_A_Read_B;
   variable Write_B_Write_A : memory_collision_type ;--:= Write_B_Write_A;
   variable Read_B_Write_A : memory_collision_type ;--:= Read_B_Write_A;
   variable Write_B_Read_A : memory_collision_type ;--:= Write_B_Read_A;
3. The compilation script is listed below:
   #!/bin/bash
   rm -fr leon/simprim
   mkdir leon/simprim
   /usr/local/bin/ghdl -a --no-vital-checks --ieee=synopsys --workdir=leon/simprim --work=SIMPRIM /home/lxuser/pini/pini_share/simprims/simprim_Vpackage.vhd
   /usr/local/bin/ghdl -a --no-vital-checks --ieee=synopsys --workdir=leon/simprim --work=SIMPRIM /home/lxuser/pini/pini_share/simprims/simprim_Vcomponents.vhd
   /usr/local/bin/ghdl -a --no-vital-checks --ieee=synopsys --workdir=leon/simprim --work=SIMPRIM /home/lxuser/pini/pini_share/simprims/simprim_SMODEL.vhd
   /usr/local/bin/ghdl -a --no-vital-checks --ieee=synopsys --workdir=leon/simprim --work=SIMPRIM /home/lxuser/pini/pini_share/simprims/simprim_VITAL.vhd

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