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SCALD

SCALD is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand SCALD rather than just read about it. In short: The structured computer-aided logic design (SCALD) software was a computer aided design system developed for building the S-1 computer. It used the Stanford University Drawing System (SUDS), and it was developed by Thomas M.

Key takeaways

  • SCALD belongs to computer science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect SCALD to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of SCALD from memory before moving on to harder problems.

Reference excerpt

The structured computer-aided logic design (SCALD) software was a computer aided design system developed for building the S-1 computer. It used the Stanford University Drawing System (SUDS), and it was developed by Thomas M. McWilliams and Lawrence Curtis Widdoes, Jr. The work led to the start of the Valid Logic Systems company (briefly known as SCALD Corporation) in 1981, which was purchased by Cadence Design in 1991. McWilliams and Widdoes won the W. Wallace McDowell Award in 1984 for the SCALD methodology.

See also Static timing analysis

References

Stump, Holly; McWilliams, Tom; Widdoes, Curt (February 12, 2008), SCALD Oral History: #1 of 3 (Tom McWilliams and Curt Widdoes Together) (PDF), Mountain View, CA: Computer History Museum, archived from the original (PDF) on July 8, 2010 Stump, Holly; Widdoes, Curt (February 12, 2008), SCALD Oral History: #2 of 3 (Curt Widdoes Alone) (PDF), Mountain View, CA: Computer History Museum, archived from the original (PDF) on July 8, 2010 Stump, Holly; McWilliams, Tom (February 12, 2008), SCALD Oral History: #3 of 3 (Tom McWilliams Alone) (PDF), Mountain View, CA: Computer History Museum, archived from the original (PDF) on July 8, 2010

Worked examples

Example 1 — a first encounter with SCALD

Start with the simplest possible case. Write down what SCALD claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to SCALD before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about SCALD ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of SCALD

In research
SCALD appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses SCALD in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
SCALD is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer-aided design stubs, Electronic design automation, Lawrence Livermore National Laboratory, so understanding it makes those chapters shorter.
In everyday life
Look for SCALD outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study SCALD in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what SCALD means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain SCALD out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SCALD in simple terms?

The structured computer-aided logic design (SCALD) software was a computer aided design system developed for building the S-1 computer. It used the Stanford University Drawing System (SUDS), and it was developed by Thomas M.

Why does SCALD matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study SCALD?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on SCALD.

Tags

  • Computer-aided design stubs
  • Electronic design automation
  • Lawrence Livermore National Laboratory

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