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PCI Express System Architecture by MindShare, Inc, Ravi Budruk, Don Anderson, Tom Shanley

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High Speed Electrical Signaling

Refer to Figure 12-2. High-speed LVDS (Low-Voltage Differential Signaling) electrical signaling is used in driver and receiver implementations. Drivers and receivers from different manufacturers must be inter-operable and may be designed to be hot-pluggable. A standard FR4 board can be used to route the Link wires. The following sections describe the electrical characteristics of the driver, receiver, and the Link represented in the Figure.

Figure 12-2. Differential Transmitter/Receiver

Clock Requirements

General

The transmitter clocks data out at 2.5Gbits/s. The clock used to do so must be accurate to +/- 300 ppm ...

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