AR8035-Atheros: 4th Gen Tri-Speed Ethernet PHY with RGMII Interface

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AR8035-Atheros是一款由Atheros Communications, Inc.设计的集成10/100/1000Mbps以太网收发器，它属于该公司北极系列产品的成员，该系列还包括AR8031、AR8033和AR8035。作为第四代产品，这款单端口三速以太网物理层(PHY)解决方案旨在提供高性能的网络连接。该器件的主要特点包括： 1. **高速接口支持**：AR8035支持RGMII（Reduced Gigabit Media Independent Interface），这是一种简化了的千兆位媒体独立接口，可以高效地传输数据，确保在10/100/1000Mbps的速度下实现稳定的通信。 2. **多速率兼容性**：作为三速以太网PHY，它能够适应不同的网络环境，无论是传统的10Mbps、快速以太网100Mbps还是千兆以太网1000Mbps，都能无缝工作，提高网络的灵活性和兼容性。 3. **高级功能**：AR8035集成了诸如Signal-Sustain Technology™（信号持久技术）、安装快速（InstallNGo™）等特性，旨在简化设备安装和维护过程，提升用户体验。 4. **品牌和商标**：Atheros拥有多项注册商标，如Atheros SST™、U-Nav™、WakeonWireless™等，这些标志着产品的高质量和创新特性。此外，还有Ethos™、IQUE™、ROCm™等技术，展示了公司在无线通信领域的专业技术。 5. **版本更新**：该数据表提到的Ver.2.1版本表示AR8035可能已经经历过多次更新，以优化性能，修复错误，或增加新功能，以满足不断发展的网络需求。 6. **版权声明**：所有权利保留，未经Atheros Communications, Inc.许可，不得复制或使用其知识产权，包括专利、商标和设计。 7. **适应性和应用领域**：AR8035因其高性能和广泛的接口支持，适用于各种商业和工业应用，特别是对高速、稳定网络连接有高要求的场景，如数据中心、服务器机房、工业自动化系统等。总结来说，AR8035-Atheros是一款先进的以太网收发器，凭借其多速率支持、高效接口、易用特性和Atheros的专有技术，为用户提供了一种高效且可靠的网络解决方案。其在不同网络环境下都能展现出卓越性能，是现代网络基础设施中的关键组件。

Atheros Communications, Inc. AR8035 Integrated 10/100/1000 Mbps Ethernet Transceiver • 11

COMPANY CONFIDENTIAL November 2011 • 11

NOTE: 0=Pull-down, 1=Pull-up

NOTE: Power on strapping pins are latched

during power-up reset or warm hardware reset.

NOTE: Some MAC devices input pins may drive

high/low during power-up or reset. So PHY

power on strapping status may be affected by

the MAC side. In this case an external 10k

Ω pull-

down or pull-high resistor is needed to ensure a

stable expected status.

NOTE: When using 2.5V RGMII I/O voltage level,

RX_CLK can be pull-up or pull-down.

Table 1-4.

PHY Pin

PHY Core

Configuration Signal Description

Default

Internal

Weak Pull-

up/Pull-

down

RXD0 PHYADDRESS0 LED_ACT, RXD[1:0] sets the lower three bits of

the physical address. The upper two bits of the

physical address are set to the default, “00”

RXD1 PHYADDRESS1 0

LED_ACT PHYADDRESS2 1

RX_DV MODE0 mode select bit 0 0

RXD2 MODE1 mode select bit 1 0

LED_1000 MODE2 mode select bit 2 1

RXD3 MODE3 mode select bit 3 0

RX_CLK 1.8V/1.5V Select the RGMII/RMII I/O voltage level

1: 1.8V I/O

0: 1.5V I/O

Free Datasheet http://www.Datasheet4U.com

14 • AR8035 Integrated 10/100/1000 Mbps Ethernet Transceiver Atheros Communications, Inc.

14 • November 2011 COMPANY CONFIDENTIAL

2.1 Transmit Functions

Table 2-2 describes the transmit function

encoder modes.

2.2 Receive Functions

2.2.1 Decoder Modes

Table 2-3 describes the receive function

decoder modes.

2.2.2 Analog to Digital Converter

The AR8035 device employs an advanced high

speed ADC on each receive channel with high

resolution, which results in better SNR and

lower error rates.

2.2.3 Echo Canceller

A hybrid circuit is used to transmit and receive

simultaneously on each pair. A signal reflects

back as an echo if the transmitter is not

perfectly matched to the line. Other connector

or cable imperfections, such as patch panel

discontinuity and variations in cable

impedance along the twisted pair cable, also

result in drastic SNR degradation on the

receive signal. The AR8035 device implements

a digital echo canceller to adjust for echo and is

adaptive to compensate for the varied channel

conditions.

2.2.4 NEXT Canceller

The 1000 BASE-T physical layer uses all four

pairs of wires to transmit data. Because the four

twisted pairs are bundled together, significant

high frequency crosstalk occurs between

adjacent pairs in the bundle. The AR8035

device uses three parallel NEXT cancellers on

each receive channel to cancel high frequency

crosstalk. The AR8035 cancels NEXT by

subtracting an estimate of these signals from

the equalizer output.

2.2.5 Baseline Wander Canceller

Baseline wander results from Ethernet links

that AC-couple to the transceivers and from

AC coupling that cannot maintain voltage

levels for longer than a short time. As a result,

transmitted pulses are distorted, resulting in

erroneous sampled values for affected pulses.

Baseline wander is more problematic in the

1000 BASE-T environment than in 100 BASE-

TX due to the DC baseline shift in the transmit

and receive signals. The AR8035 device uses an

advanced baseline wander cancellation circuit

that continuously monitors and compensates

for this effect, minimizing the impact of DC

baseline shift on the overall error rate.

2.2.6 Digital Adaptive Equalizer

The digital adaptive equalizer removes inter-

symbol interference at the receiver. The digital

adaptive equalizer takes unequalized signals

from ADC output and uses a combination of

feedforward equalizer (FFE) and decision

Table 2-2. Encoder Mode

Encoder Mode Description

1000 BASE-T In 1000 BASE-T mode, the AR8035

scrambles transmit data bytes

from the MAC interfaces to 9-bit

symbols and encodes them into

4D five-level PAM signals over the

four pairs of CAT5 cable.

100 BASE-TX In 100 BASE-TX mode, 4-bit data

from the MII is 4B/5B serialized,

scrambled, and encoded to a

three-level MLT3 sequence

transmitted by the PMA.

10 BASE-Te In 10 BASE-Te mode, the AR8035

transmits and receives

Manchester-encoded data.

Table 2-3. Decoder Mode

Decoder Mode Description

1000 BASE-T In 1000 BASE-T mode, the PMA

recovers the 4D PAM signals after

accounting for the cabling

conditions such as skew among

the four pairs, the pair swap order,

and the polarity of the pairs. The

resulting code group is decoded

into 8-bit data values. Data stream

delimeters are translated

appropriately and data is output

to the MAC interfaces.

100 BASE-TX In 100 BASE-TX mode, the receive

data stream is recovered and

descrambled to align to the

symbol boundaries. The aligned

data is then parallelized and 5B/

4B decoded to 4-bit data. This

output runs to the MII receive

data pins after data stream

delimiters have been translated.

10 BASE-Te In 10 BASE-Te mode, the

recovered 10 BASE-Te signal is

decoded from Manchester then

aligned.

Free Datasheet http://www.Datasheet4U.com

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