Valid Logic Systems

Description

Developed at Stanford and funded by the Navy, Structured Computer-Aided Logic Design (SCALD) was designed to help build supercomputers and was released into the public domain when the program completed. Over 150 copies of the tools were requested. Daisy Systems, Mentor Graphics, Valid Logic Systems and others all had copies of the source code. Within Valid, the entire system was rewritten so as to make it more technology independent.

SCALD specified a graphics editor, hierarchical design, simulation and timing verification. That became the baseline for EDA systems.

• Founded in 1981 by: L. Curtis Widdoes, Tom McWilliams and Jeff Rubin, all of whom worked on the S-1 supercomputer at Lawrence Livermore National Laboratory.
• Known for: SCALD
• Other names: Valid, SCALD
• Type: Company

ACQUISITION:

• Valid Logic Systems acquired Analog Design Tools Inc. in 1989. $35M in stock.
• Valid Logic Systems acquired Integrated Measurements Systems, Inc. in 1989
• Valid Logic Systems acquired Calma Company in 1988. Approximately $3M.
• Valid Logic Systems acquired Telesis Systems Corp in 1987. 4.2m shares, valuing it at $20m.
• Valid Logic Systems acquired Intermetrics VHDL simulator in 1986

ACQUIRED BY:

• Cadence Design Systems acquired Valid Logic Systems in 1991.

DEPRECATION OF:

• Valid Logic Systems used to be known as SCALD Corporation until 1981. Investors did not like the thought that people would be SCALDed.