| Hi, 
Chun Lin, RAMB4_S16_S16.v is part of the xilinx library so if you have Xilinx 
Foundation installed, it is part of it. You'll need this tool anyway if you want 
to implement MAC in Xilinx chips. Similar goes for glbl.v art_hsdp_256x40.v is part of the Artisan library and is usefull if you 
intend to use MAC in ASIC. For 
simulation purposes generic_tpram.v is enough. It is just a simulation model and 
is attached to this model. You can also find it on cvs. Look here: http://www.opencores.org/cvsweb.shtml/common/generic_memories/rtl/verilog/ Regards,     Igor 
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