CX11656-11 View Datasheet(PDF) - Conexant Systems

Part Name

Description

Manufacturer

CX11656-11

Home Networking Physical Layer Device with Integrated Analog Front End Circuitry

Conexant Systems 

CX11656 HomePlug 1.0 PHY Data Sheet

1.

Introduction

1.1

Overview

The Conexantä CX11656 device is an integrated physical layer transceiver or PHY

(Figure 1-1). It is designed to use existing ac electrical wiring within the home as a

networking physical medium. The PHY’s robust performance in the electrically noisy

power line channel is due to the use of Orthogonal Frequency Division Multiplexing

(OFDM). This multi-carrier modulation scheme allows the PHY to dynamically “learn

the channel”— data can be shifted from one carrier to another as real time noise and

attenuation conditions change. This overcomes the flaw inherent in previous power line

networking technologies—as electrical appliances were turned on and off, changing line

conditions caused signal quality to become degraded to such an extent that data

transmission became impossible. The CX11656’s OFDM technology finds the low noise,

low attenuation portions of the spectrum available to it and continues data transmission.

The CX11656 is compliant with the HomePlug Powerline Alliance Industry Specification

V1.0. This ensures interoperability with other HomePlug PHYs. Quality-of-service (QoS)

is built into the PHY to ensure low-latency, high reliability channels for streaming audio,

streaming video, voice, and gaming, and video.

The PHY utilizes the IEEE 802.3u standard Media Independent Interface (MII). This

standard interface can also be configured as a seven-wire General Purpose Serial

Interface (GPSI). These standard interfaces allow the CX11656 to be paired almost any

embedded media access controller (MAC) for use in a variety of information appliances.

The CX11656 operates on both +1.8 V and +3.3 V supplies and is packaged in a 144-pin

Low Quad Flat Pack (LQFP).

The CX11656 ordering information is listed in Table 1-1.

A functional block diagram of the CX11656 is shown in Figure 1-2.

Please contact Conexant marketing for information concerning the AFE.

Figure 1-1. CX11656 HomePlug 1.0 PHY Simplified Hardware Interface

Ethernet

Interface

802.3 EMAC

(e.g., Conexant

CX82100)

MII/GPSI

Interface

Conexant

CX11656

HomePlug 1.0 PHY

144-Pin LQFP

Parallel

Interface

Analog

Front End*

Coupler

Powerline

* See Section 5.4.

102069_001

102069A

Conexant Proprietary and Confidential Information

1-1

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