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Possible Duplicate:
Good Tools for Drawing Schematics

I'm looking for a schematic editor/capture tool to use in the very initial steps of a digital design. This is, as a block diagram editor, instead of inkscape or similar. The idea is to replicate schemas like this without doing it on paper:

4Bit CPU ALU

The final design, although it would be perfect to have VHDL/verilog export capabilities, will be done by hand in HDL language. I need a tool to design an initial block diagram, with the main signals/buses and elements, as well as the pipeline of the datapath of a hypothetical custom processor.

I've checked Xilinx ISE, gEDA (gschem) and other propierary tools, but none of them is suitable for this as they are quite specific (ISE) or the opposite (gschem). Here ins stack I've found some questions, as this. However, I looking for a closer approach to processor architecture, datapaths, registers, memories, arithmetic units, etc. A professional look & feel is also desirable.

Any idea would be welcome.

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marked as duplicate by Kortuk Jan 16 '12 at 18:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • \$\begingroup\$ The duplicate doesn't cover exactly what I need. In addition, most of them are open source tools, a propierary solution from Synopsys, Mentor Graphics, Cadence or other company is welcome. The approach I need is more closed to computer architecture, is not viable to design a full system-on-chip with gschem or similar tools. \$\endgroup\$ – amnl Jan 17 '12 at 7:47