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Hardware Interface Protocol PCI CD/CDa Configurable DMA Interface User’s Guide

12 EDT, Inc. May 2007

Hardware Interface Protocol

This section describes how to connect your device to a PCI CD/CDa interface, including the electrical

characteristics of the signal, the signal descriptions, the timing specifications, and the connector pin-

out.

Electrical Interface

The PCI CD/CDa uses differential data transmission to transmit data at very high rates over long

distances through noisy environments. Differential transmission nullifies the effects of ground shifts

and noise. These effects appear as common mode voltages on the transmission line and are rejected

by the receiver. A typical balanced differential circuit is shown below.

Figure 2. Balanced Differential Circuit

The interface is implemented with 32 signals (PCI CD) or 35 signals (PCI CDa), each implemented as

a differential pair of wires.

driver

receivertwisted pair cable

100-Ω

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