The data books from AMD, Atmel, and other PLD manufacturers are excellent sources of tutorials, examples, and information on PLD design. The EDIF tutorials produced by the EIA [ EDIF, 1988, 1989] are hard to find, but there are few other texts or sources that explain EDIF. EDIF does have a World Wide Web site at http://www.edif.org . The EDIF Technical Centre at the University of Manchester ( http://www.cs.man.ac.uk/cad , I shall refer to this as ~EDIF ) serves as a resource center for EDIF, including the formal information models of the EDIF language in EXPRESS format and the BNF definitions of the language syntax. There is a hypertext version of an EDIF 3 0 0 schematic file with hypertext links at ~EDIF/EDIFTechnicalCenter/software . CFI has a home page and links to other sites at http://www.cfi.org .
PALASM4 v1.5 is available as “freeware” from AMD at ftp://ftp.amd.com/pub/pld/software/palasm . The Data I/O home page at http://www.data-io.com is devoted mainly to Synario. The Viewlogic home page is http://www.viewlogic.com . Capilano Computing has a Web page at http://www.capilano.com with DesignWorks and MacABEL software. Protel ( http://www.protel.com/download.htm ) has Windows-based schematic-entry tools for FPGAs and a CUPL demonstration package. Logical Devices has a site at http://www.logicaldevices.com . Atmel has several demonstration and code examples for ABEL and CUPL at ftp://www.atmel.com/pub/atmel .