computer science

PCI/104-Express

PCI/104-Express 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 PCI/104-Express rather than just read about it. In short: The PCI/104-Express specification establishes a standard to use the high-speed PCI Express bus in embedded applications. It was developed by the PC/104 Consortium and adopted by member vote in March 2008.

Key takeaways

PCI/104-Express 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 PCI/104-Express to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PCI/104-Express from memory before moving on to harder problems.

Reference excerpt

The PCI/104-Express specification establishes a standard to use the high-speed PCI Express bus in embedded applications. It was developed by the PC/104 Consortium and adopted by member vote in March 2008. PCI Express was chosen because of its market adoption, performance, scalability, and growing silicon availability worldwide. It provides a new high-performance physical interface while retaining software compatibility with the existing PCI infrastructure. Incorporating the PCI Express bus within the industry proven PC/104 architecture brings many advantages for embedded applications including fast data transfer, low cost due to PC/104’s unique self-stacking bus, high reliability due to PC/104’s inherent ruggedness, and long-term sustainability.

Specification Overview There are two versions of the specification that are complementary. The main difference is that Type 2 replaces the PCI Express x16 link with SATA, USB 3.0, LPC, and RTC battery. Both Type 1 and Type 2 have this common feature set and pin assignments:

Four x1 PCI Express Links Two USB 2.0 ATX power and control signals: +5V Standby, Power supply on, Power OK Power: +3.3V, +5V, +12V SMBus Type 1 has the common feature set plus:

One x16 PCI Express Link, or optionally two x8 Links, two x4 PCI Express Links, or two SDVO Type 2 has the common feature set plus:

Two x4 PCI Express Links Two USB 3.0 Two SATA LPC Bus RTC Battery

See also Computer form factor Embedded system

References

External links PC/104 Specifications

Worked examples

Example 1 — a first encounter with PCI/104-Express

Start with the simplest possible case. Write down what PCI/104-Express 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 PCI/104-Express 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 PCI/104-Express 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 PCI/104-Express

In research: PCI/104-Express 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 PCI/104-Express 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: PCI/104-Express is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer hardware standards, Motherboard form factors, so understanding it makes those chapters shorter.
In everyday life: Look for PCI/104-Express 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 PCI/104-Express in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PCI/104-Express means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain PCI/104-Express out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PCI/104-Express in simple terms?

Why does PCI/104-Express 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 PCI/104-Express?

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 PCI/104-Express.