• Clocks
• ASICs Application Specific Integrated Circuits
• GAL Gate Array Logic
• PLDs Programmable Logic Devices
• ISP PLDs or FPGAs In System Programmable Programmable Logic Devices or Field Programable Gate Arrays

See also:

• "Simulation of Simple Digital Logic through a Computer-Aided Design System" by Robert McDermott, Byte magazine, January 1983 pg 396
• http://www.directories.mfi.com/gateways/pld/pld.txt
• http://www.optimagic.com/index.shtml * FREE downloadable FPGA and CPLD design software* Information on devices, boards, books, consultants, etc.* FAQ plus tutorials on VHDL and Verilog
• SynaptiCAD has an evaluation version of their Timing Diagrammer tool. Actel for giving away IMHO the best free tools in the FPGA industry, and congratulations Synplicity for supporting thier product.
• Atmel has a free downloadble version of WinCUPL which can translate equations into jedec files.
• Embedded Systems article intoducing Programmable Logic
• Digital filter design softare package
• App note from Xilinx which describes a 8250 UART core designed in ViewLogic schematics.
• Free? Intellectual Properties (applications for FGPAs or CPLDs)
  • http://www.scsise.wmin.ac.uk/~seamang/freehardware.html
  • http://www.cmosexod.com/
  • http://circu.its.tudelft.nl/
  • http://www.scsise.wmin.ac.uk/~seamang/freehardware.html
  • http://www.scrap.de/html/openip.htm
  • http://www.geocities.com/SiliconValley/Chip/5014/
  • http://www.vhdl.org/vi/fmf/
  • http://tech-www.informatik.uni-hamburg.de/vhdl/vhdl.html
  • http://dmoz.org/Computers/Open_Source/Hardware/
  • http://www.mindspring.com/~tcoonan freeware Verilog PIC CPU core
  • http://www.silicore.net. Pro PIC CPU core.
  • http://www.fpga-design.com/
• http://www.armory.com/~rstevew
• http://www.xilinx.com/xbrf/xbrf006.pdf This paper examines some general concepts concerning Phase Locked Loop (PLL) usage and their application in programmable logic devices. A critique of a newly-announced PLL implementation for FPGAs also is included.
• http://www.associatedpro.com

benchmarks:

• Three FPGAs (Xilinx Virtex, Lucent Orca3, Atmel AT40K) and three CPLDs (Vantis Mach5, Lattice ispLSI 5000V and Philips XPLA2). Article and Addendum (with all the data):