add old notes and README

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diff --git a/notes/.xilinx_filetypes.txt.swp b/notes/.xilinx_filetypes.txt.swp
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diff --git a/notes/debugging.txt b/notes/debugging.txt
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+
+
+RED TIN on-chip logic analyser
+  http://siliconexposed.blogspot.com/2012/06/isim-bugs-and-introducing-red-tin.html
+  http://code.google.com/p/red-tin-logic-analyzer/
+  Use with gtkwave GUI
+
+sigrok
+  Soft real-time 
+
diff --git a/notes/knowledge.txt b/notes/knowledge.txt
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+
+Great sources of FPGA knowledge!
+
+FPGAs!? Now What?
+  Free/Open FPGA-from-scratch tutorial from XESS. 140+ pages.
+  Pretty great!
+  Xilinx WebPack, VHDL, JTAG debug, Spartan.
+
+MIT 6.111 Labkit Manual
+  http://www-mtl.mit.edu/Courses/6.111/labkit/
+
+WikiBooks: Programmable Logic
+  http://en.wikibooks.org/wiki/Programmable_Logic
diff --git a/notes/licensing.txt b/notes/licensing.txt
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+
+Open Source Semiconductor Core Licensing
+    by Eli Greenbaum, Harvard Journal of Law and Technology, Fall 2011
+
+Xilinx SignOnce IP Licensing
+    http://www.xilinx.com/products/alliance/signonce.htm
+
+https://github.com/ewa/free-hdl-license/wiki
diff --git a/notes/style.txt b/notes/style.txt
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+
+XXX: verilog style guide here?
+
+Eg, 
+
+Signed arithmetics in Verilog: The only rule one needs to know
+http://billauer.co.il/blog/2012/10/signed-arithmetics-verilog/
diff --git a/notes/tools.txt b/notes/tools.txt
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+
+QFSM finite state machine tool
+  http://qfsm.sourceforge.net/about.html
+  GUI for designing and documenting state machines. looks reasonably mature
+  generates verilog, vhdl, etc; C, java, ruby code (via ragel);
+  svg, png diagrams; text, html tables
+
+doxverilog
+  http://developer.berlios.de/projects/doxverilog/
+  doxygen for verilog
+
+Minimal Makefile for Xilinx WebPack
+  http://excamera.com/sphinx/fpga-makefile.html
+  from gameduino guy
diff --git a/notes/unsorted.txt b/notes/unsorted.txt
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+
+another set of xilinx makefiles
+  https://github.com/marvin2k/xilinx_makefile
+
+collection of tools
+  https://github.com/Ceasar/xilinx_sucks
+
+scons build scripts for xilinx
+  https://github.com/ewa/xilinx-build-scripts
+
+FPGALink JTAG-like thing
+  http://www.makestuff.eu/wordpress/software/fpgalink/
+
+Xillybus
+  Win/Linux PCI-e DMA IP core and kernel drivers. Proprietary
+  http://xillybus.com/licensing
+
+On-chip JTAG for softcores
+  http://moxielogic.org/blog/?p=704
+  from the Moxie processor project
+
diff --git a/notes/xilinx_filetypes.txt b/notes/xilinx_filetypes.txt
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+
+See also:
+
+https://github.com/JPNaude/X-MimeTypes/blob/master/eda_mime_types.xml
+http://www.xilinx.com/support/documentation/sw_manuals/xilinx14_4/cgn_r_core_generator_output_files.htm
+http://www.xilinx.com/support/documentation/sw_manuals/xilinx14_4/ise_r_source_types.htm
+
+also: devref.pdf (UG628)
+
+Extension   Description
+---------   --------------------------------------------------------------
+.par        "place and route" output
+.vhd        VHDL source code
+.v          Verilog source code
+.ucf        "constraints file": hardware pinouts, timing, etc
+.prj        [list of files in the project?]
+.wcfg       [waveform configuration (saved from gtkwave?]
+.srp        "Synthesis Report File"
+.xst        [xst settings?]
+.lso
+.vcf
+
+.bgn        bitgen report file
+.bit        Final FPGA bitstream file (binary)
+.xwbt
+.bld        Build report from NGDBuild
+.blc        NGDBuild report file
+.cmd_log
+.drc        Design rule check output
+.ncd
+.wdb
+.exe
+.map        [intermediate step]
+.mrp
+.ncd        [intermediate step? netlist?]
+.ngm
+.xrpt
+.par        [place and route output?]
+.pcf
+.ptwx
+.stx
+.syr
+.twr
+.twx
+.unroutes   unrouted traces; if routing was successful, there should be none
+.ut
+.xpi
+.log
+.xmsgs
+.gise
+.xise       ISE project/workplace
+
+.cgc        [coregen? used to programatically re-gen core?]
+.cgp        Coregen Project
+.ngc        Pre-compiled netlist
+.sym
+.asy        "Symbol file"
+_flist.txt  File list (?)
+.gise
+.ncf
+.sym
+.veo
+.vho
+.xco        [intermediate file?]
+
diff --git a/notes/xilinx_toolchain.txt b/notes/xilinx_toolchain.txt
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+
+Chapter Two of "FPGAs!? Now What?" gives a good overview of the full
+compilation process:
+
+Synthesis:
+  the "logic synthesizer" compiles from HDL to a netlist
+
+Implementation:
+  the "translator" takes a set of netlists and design constraints and generates
+      a merged netlist (?).
+  then a "mapper" regroups the netlist so that place and route will be easier
+  then a "place and route" tool decides exactly how the FPGA logic will be
+      configured
+
+Bitstream:
+  the "bitstream generator" translates the configuration into the binary format
+      that the FPGA uses to re-flash itself