Intel Ethernet Connection I219 Datasheet - 技术规格与特性

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"ethernet-connection-i219-datasheet.pdf" 本文档是关于Intel Ethernet Connection I219的数据表，详细介绍了该网络连接器的主要特性和功能，主要用于客户端连接。以下是其关键知识点： 1. **协议兼容性**：Intel Ethernet Connection I219遵循多个IEEE 802.3标准，支持10BASE-T、100BASE-TX和1000BASE-T（即10兆、100兆和1千兆）的以太网连接，确保了与不同速度网络的兼容性。 2. **节能特性**：实现了Energy Efficient Ethernet（EEE）和IEEE 802.3az标准，即低功耗空闲（LPI）模式，旨在在网络活动较少时降低功耗，提高能效。 3. **自适应能力**：支持IEEE 802.3u自动协商，可自动适应网络速度和全双工/半双工模式。此外，具备自动MDI/MDIX交叉功能，无需使用交叉网线即可与不同设备连接。 4. **故障检测和诊断**：提供环回模式，有助于进行网络诊断。同时，具备先进的数字基线漂移校正，确保数据传输的稳定性。 5. **电源管理**：通过灵活的PHY过滤器减少集成LAN控制器的功耗，智能速度操作能自动降低在故障电缆环境中的运行速度，优化电源使用。 6. **PMA Loopback**：支持物理媒介附加（PMA）层的环回功能，无回声消除，用于测试和调试。 7. **时间同步**：符合802.1as/1588标准，支持精确时间协议（PTP），适用于需要精确时间同步的网络应用，如VoIP和视频流。 8. **安全与管理**：与Intel vPro技术兼容，提供高级安全和管理功能，适合企业级部署。支持网络代理/ARP卸载，减轻CPU负担，提高系统性能。 9. **过滤与优化**：最多支持32个可编程过滤器，能够高效地管理和筛选网络流量，增强网络性能。 10. **稳定性与更新策略**：Intel Stable Image Platform Program (SIPP)确保长期的软件稳定性和更新策略，为企业提供可靠的平台支持。 Intel Ethernet Connection I219是Intel公司针对客户端设备设计的一款高性能、低功耗的以太网连接解决方案，它集成了多种先进技术，旨在提供可靠、高效且易于管理的网络连接。

Intel

Ethernet Connection I219—Interconnects

2.2.2.1.3 Status Packet from PHY

This in-band message is equivalent to the PtM PHY Status command on the SMBus. The status

command is sent by the I219 on every status change at the PHY side or when a timeout defined in the

In-Band Control register has expired. The I219 re-transmits the Status command if no acknowledge

arrived after a time out defined in the PCIe Diagnostic register has expired.

Byte Description

Special MDIO Symbol /K28.1/

Bit 6 = 0b

Bit 7:

1b = Status

1st Data Byte Bit 0 = K1 entry request

Bit 1 = TX Off (MAC back pressure required)

Bit 2 = EI entry request

Bit 3 = Reserved (must be 0b)

Bit 4 = Reserved

Bit 5 = Inband Host WoL indication

Bits 7:6 = Reserved (must be 0x0)

2nd Data Byte Bits 1:0 = Speed:

00b = 10 Mb/s

01b = 100 Mb/s

10b = 1000 Mb/s

11b = Reserved

Bit 2 = Duplex mode:

0b = Half duplex

1b = Full duplex

Bit 3 = PHY Link status:

0b = Link down

1b = Link up

Bit 4 = PHY cable disconnected

Bit 5 = GLCI link status:

0b = Link down

1b = Link up

Bit 6 = Interrupt request (Not used)

Bit 7 = Reset complete

Reserved Byte Reserved byte (must be 0b).

CRC-8 Byte CRC of in-band packet excluding the K28.1 special symbol.

Interconnects—Intel

Ethernet Connection I219

2.3 SMBus

2.3.1 Overview

SMBus is a low speed (100 kHz/400 kHz/1000 kHz) serial bus used to connect various components in a

system. SMBus is used as an interface to pass traffic between the I219 and the integrated LAN

Controller when the system is in a low power Sx state. The interface is also used to enable the

integrated LAN Controller to configure the I219 as well as passing in-band information between them.

The SMBus uses two primary signals to communicate: SMBCLK and SMBDAT. Both of these signals are

open drain with board-level pull-ups.

The SMBus protocol includes various types of message protocols composed of individual bytes. The

message protocols supported by the I219 are described in the relevant sections.

For further details on SMBus behavior, refer to the SMBus specification.

2.3.1.1 SMBus Channel Behavior

The SMBus specification defines the maximum frequency of the SMBus as 100 kHz or 1000 kHz. When

operating at 1000 kHz, the SMBus specification parameters are defined by the I

C specification.

To change the I219’s SMBus frequency to 1000 kHz, bit 12,8 in the SMBus Address register (register

26, address 01, page 0) should be set to 10b. For details, refer to Section 9.5.8.3.

2.3.1.2 SMBus Addressing

The I219’s address is assigned using SMBus ARP protocol. The default SMBus address is 0xC8.

2.3.1.3 Bus Time Outs

The I219 can detect (as a master or a slave) an SMBCLK time out on the main SMBus. If the SMBus

clock line is held low for less than 25 ms, the I219 does not abort the transaction. If the SMBus clock

line is held low for 25 ms or longer, the I219 aborts the transaction.

As a slave, the I219 detects the time out and goes into an idle state. In idle, the slave releases the

SMB_CLK and SMB_DATA lines. Any data that was received before the time out might have been

processed depending on the transaction.

As a master, the I219 detects a time out and issues a STOP on the SMBus at the next convenient

opportunity and then brings the SMBus back to idle (releases SMB_CLK and SMB_DATA). Any master

transaction that the I219 detects a time out on, is aborted.

Intel

Ethernet Connection I219—Interconnects

2.3.1.4 Bus Hangs

Although uncommon, SMBus bus hangs can happen in a system. The catalyst for the hang is typically

an unexpected, asynchronous reset or noise coupled onto the SMBus. Slaves can contribute to SMBus

hangs by not implementing the SMBus time outs as specified in SMBus 2.0 specification. Masters or

host masters can contribute to SMBus hangs by not detecting the failures and by not attempting to

correct the bus hangs.

Because of the potential bus hang scenario, the I219 has the capability of detecting a hung bus. If

SMB_CLK or SMB_DATA are stuck low for more than 35 ms, the I219 forces the bus to idle (both

SMB_CLK and SMB_DATA set), if it is the cause of the bus hang.

2.3.1.5 Packet Error Code (PEC) Support

PEC is defined in the SMBus 2.0 specification. It is an extra byte at the end of the SMBus transaction,

which is a CRC-8 calculated on all of the preceding bytes (not including ACKs, NACKs, STARTs, or

STOPs) in the SMBus transaction. The polynomial for this CRC-8 is:

x8 + x2 + x + 1

The PEC calculation is reset when any of the following occurs:

• A STOP condition is detected on the host SMBus.

• An SMBus hang is detected on the host SMBus.

• The SMBCLK is detected high for ~50 s.

2.3.1.6 SMBus ARP Functionality

The I219 supports the SMBus ARP protocol as defined in the SMBus 2.0 specification. The I219 is a

persistent slave address device, meaning its SMBus address is valid after power up (constant 0xC8).

The I219 supports all SMBus ARP commands defined in the SMBus specification, both general and

directed.

2.3.1.6.1 SMBus ARP Flow

SMBus ARP flow is based on the status of two flags:

• AV (Address Valid) — This flag is set when the I219 has a valid SMBus address.\

• AR (Address Resolved) — This flag is set when the I219 SMBus address is resolved (SMBus address

was assigned by the SMBus ARP process).

Note: These flags are internal I219 flags and are not shown to external SMBus devices.

Since the I219 is a Persistent SMBus Address (PSA) device, the AV flag is always set, while the AR flag

is cleared after power up until the SMBus ARP process completes. Since AV is always set, it means that

the I219 always has a valid SMBus address.

When the SMBus master wants to start a SMBus ARP process, it resets (in terms of ARP functionality)

all the devices on the SMBus by issuing either Prepare to ARP or Reset Device commands. When the

I219 accepts one of these commands, it clears its AR flag (if set from previous SMBus ARP process), but

not its AV flag; the current SMBus address remains valid until the end of the SMBus ARP process.

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