Arturo,
> I'm a new user of fpga, actually i'm learning about it and i need
> help.
> I want to know how import cpu's cores (8051 or z80) into a xilinx fpga
> device ( Spartan IIe ). If someone can send me a tutorial where i can
> learn about that i thanks a lot.
You may also want to have a look at Nexar (
http://www.altium.com/nexar)
They have a pre-synthesised 8051, z80 and PIC16C cores for Altera and
Xilinx complete with build (C and asm) and debugging tools. They also
have a schematic entry front end with their cores where you can place a
8051, z80 etc on a sheet and connect it up making it child’s play and
ideal for designers new to
fpga. There is a couple of good tutorials
which come with the package.