The IEEE Verilog LRM  is less intimidating than the IEEE VHDL LRM, because it is based on the OVI LRM, which in turn was based on the Verilog-XL simulator reference manual. Thus it has more of a "User's Guide" flavor and is required reading for serious Verilog users. It is the only source for detailed information on the PLI.
Phil Moorby was one of the original architects of the Verilog language. The Thomas and Moorby text is a good introduction to Verilog . The code examples from this book can be obtained from the World Wide Web. Palnitkar's book includes an example of the use of the PLI routines .
Open Verilog International
(OVI) has a Web site maintained by Chronologic (
) with membership information and addresses and an ftp site maintained by
). OVI sells reference material, including proceedings from the International
Verilog HDL Conference.
(with a FAQ--frequently asked questions) is accessible from a number of
online sources. The FAQ includes a list of reference materials and book
reviews. Cray Research maintained an archive for
going back to 1993 but this was lost in January 1997 and is still currently
unavailable. Cadence has a discussion group at
. Wellspring Solutions offers VeriWell, a no-cost, limited capability, Verilog
simulator for UNIX, PC, and Macintosh platforms.
There is a free, "copylefted"
vbs , written by Jimen Ching and Lay Hoon
Tho as part of their Master's theses at the University of Hawaii, which
is part of the
comp.lang.verilog archive. The package includes
explanations of the mechanics of a digital event-driven simulator, including
event queues and time wheels.