added design add4
pnr/de1_add4/makefile
0 → 100644
sim/add4/makefile
0 → 100644
sim/add4/makefile.sources
0 → 100644
src/add4_rtl.vhd
0 → 100644
src/add4_structure.vhd
0 → 100644
src/de1_add1_structure.vhd
0 → 100644
src/de1_add4_structure.vhd
0 → 100644
src/t_add1.vhd
0 → 100644