Ported ddio from StratixIV to ip_arria10/ddio. See ddio/README.txt.

libraries/technology/ip_arria10/ddio/README.txt

libraries/technology/ip_arria10/ddio/compile_ip.tcl

libraries/technology/ip_arria10/ddio/generate_ip.sh

libraries/technology/ip_arria10/ddio/hdllib.cfg

libraries/technology/ip_arria10/ddio/ip_arria10_ddio_in.vhd

...ries/technology/ip_arria10/ddio/ip_arria10_ddio_in_1.qsys

libraries/technology/ip_arria10/ddio/ip_arria10_ddio_out.vhd

...ies/technology/ip_arria10/ddio/ip_arria10_ddio_out_1.qsys

libraries/technology/ip_arria10/ddio/quartus/ddio.qpf

libraries/technology/ip_arria10/ddio/quartus/ddio.qsf

...s/technology/ip_arria10/ddio/sim/ip_arria10_ddio_in_1.vhd

.../technology/ip_arria10/ddio/sim/ip_arria10_ddio_out_1.vhd

...s/technology/ip_arria10/ddio/sim/tb_ip_arria10_ddio_1.vhd