PCI Express is the natural successor to PCI, and was developed to provide the advantages of a state-of-the-art, high-speed serial interconnect technology and packet based layered architecture, but maintain backward compatibility with the large PCI software infrastructure. PCI Express Architecture In a Nutshell. Root Complex (RC) ● Root Complex (RC) – The interface between the CPU and the PCIe buses may contain several components (processor interface, DRAM interface, etc.) and possibly even several chips. ● May support one or more PCI Express Ports – Root Ports. PCI-SIG is committed to the development and enhancement of the PCI standard. Crediting its success to the contribution of nearly 800 members, PCI-SIG strives to provide them with the resources needed to remain competitive.

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1. Pci Express Architecture Pdf
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5. Pci Express System Architecture Pdf

PCI Express* (PCIe*) Architecture again leaps beyond I/O performance boundaries with PCI Express* 3.0. PCIe* 3.0 doubles the maximum data rate over its predecessor PCIe* 2.0, with transfer rates up to 8 GT/s. Yet it maintains backwards-compatibility with previous generations. Game development software. This leap in transfer speed enables greater performance capabilities to developers of PC interconnect, graphics adapters, and chip-level communications, among other applications using this ubiquitous technology.

What is PCI Express*?

PCI Express* (PCIe*) is a standards-based, point-to-point, serial interconnect used throughout the computing and embedded devices industries. Introduced in 2004, PCIe* is managed by the PCI-SIG. PCIe* is capable of the following:

• Scalable, simultaneous, bi-directional transfers using one to 32 lanes of differential-pair interconnects
• Grouping lanes to achieve high transfer rates, such as with graphics adapters
• Up to 32 GB/s of bi-directional bandwidth on a x16 connector with PCI Express* 3.0
• Low-overhead, low-latency data transfers
• Both host-directed and peer-to-peer transfers
• Emulation of network environments by sending data between two points without host-chip routing

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Why a Serial Interconnect?

PCI Express* (PCIe*) is the interconnect of choice because of its low cost, high performance, and flexibility. Maintaining software compatibility with the previous PCI* interconnect, PCIe* enables many benefits not possible with PCI, including:

• Scalable performance by grouping lanes together (one to 32)
• Lower cost, simpler implementations with its low pin counts
• Improved power management capabilities
• Ubiquity and flexibility – it’s widely used in a wide range of applications

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How PCI Express* Works

A PCI Express* (PCIe*) ‘link’ comprises from one to 32 lanes. Links are expressed as x1, x2, x4, x8, x16, etc. The link is negotiated and configured on power up. More lanes deliver faster transfer rates; most graphics adapters use at least 16 lanes in today’s PCs. The clock is embedded in the data stream, allowing excellent frequency scaling for scalable performance.

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PCI Express'* Holding Power

PCIe* 3.0, continues to scale with the demands of computing applications and delivery of higher performance processors. It remains central in both systems and devices, including servers, desktops, laptops, embedded solutions, add-on cards, and chipsets. Low latency makes it ideal as an interconnect throughout clustered systems making up the internet cloud.

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Designing with PCI Express*

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Intel, along with industry leaders, work together to ensure the PCI* standard is based on a robust specification to ensure compatibility for a multitude of products for years to come. Intel offers extensive resources to developers working with PCI Express* designs. Find out more about how Intel can help you design, develop, and deploy your PCI Express* designs faster.