USB3.1到GigabitEthernet控制器-LAN7800技术亮点与应用

LAN7800-Data-She

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"LAN7800-Data-Sheet-DS00001992G.pdf" 是Microchip Technology Inc.发布的一款单芯片高速（SS）USB 3.1 Gen1到10/100/1000以太网控制器的数据手册。该器件集成了Gigabit PHY，支持自动MDIX，以及10/100/1000 Ethernet MAC的全双工支持。此外，它还包括了内置的USB 3.1 Gen1 SS设备控制器和PHY。 **主要特性** 1. **集成Gigabit PHY与HP Auto-MDIX**： LAN7800具备集成的Gigabit PHY，能够提供千兆以太网连接。HP Auto-MDIX（自动直通交叉）功能允许以太网线缆无需区分直通或交叉，简化了连接配置。 2. **集成10/100/1000 Ethernet MAC**：具备全双工支持的以太网MAC，提供灵活的网络速度选择，适应不同应用需求。 3. **集成USB 3.1 Gen1 SS设备控制器和PHY**：这使得LAN7800可以实现高速USB 3.1 Gen1连接，传输速率可达5 Gbps，为数据传输提供高速通道。 4. **低功耗设计**：设计符合节能以太网（Energy Efficient Ethernet, IEEE 802.3az）标准，降低了待机和工作时的功耗。同时，支持Wake-on-LAN（WoL）功能，可以在网络活动时唤醒系统，提高能效。 5. **OTP内存配置**：通过一次性可编程（OTP）内存进行配置，简化了设备的设置和更新流程。 6. **NetDetach 功能**：自动处理USB的连接和断开，当以太网电缆插拔时，能自动管理USB的附加和分离状态。 **目标应用** - 汽车信息娱乐系统 - 笔记本/平板电脑扩展坞 - 可拆卸笔记本电脑 - USB端口复制器 - 独立USB至以太网适配器 - 嵌入式系统/消费电子设备 - 机顶盒/视频录像机 - 测试仪器/工业系统 **系统考虑因素** - **电源和I/O**：提供多种电源管理功能，8个GPIO，支持总线供电和自供电操作。I/O引脚电压可变，范围在1.8V到3.3V之间，适应不同电压环境。 - **软件支持**：包括Windows 7、8、8.1和10的驱动程序（微软认证），Linux驱动，OSX和macOS驱动，以及uBoot和UEFI支持，确保在各种操作系统上的兼容性和稳定性。这款控制器适用于需要高速网络连接并兼顾低功耗的多种应用场景，如汽车电子、便携式设备扩展以及工业测试设备等。其全面的软件支持确保了在各种平台上的无缝集成。

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LAN7800

DS00001992G-page 16  2015 - 2018 Microchip Technology Inc.

5.0 USB DEVICE CONTROLLER

5.1 Overview

The USB functionality consists of five major parts. The USB PHY, UDC (USB Device Controller), URX (USB Bulk Out

Receiver), UTX (USB Bulk In Transmitter), and CTL (USB Control Block).

The UDC is configured to support one configuration, one interface, one alternate setting, and four endpoints. Streams

are not supported in this device. The URX and UTX implement the Bulk-Out and Bulk-In endpoints respectively. The

CTL manages Control and Interrupt endpoints.

Each USB Controller endpoint is unidirectional with even numbered endpoints handling the OUT (from the host, actually

RX into the device) direction and odd numbered endpoints handling the IN (to the host, actually TX from the device)

direction.

The UDC endpoint numbers start at 0 and increment. Endpoint numbers are not skipped and have a fixed mapping to

the USB endpoint numbers. The corresponding USB endpoint is obtained by dividing the UDC endpoint number by 2

(rounding down). For example, single directional endpoint 0 indicates USB OUT endpoint 0, and single directional end-

point 1 corresponds to USB IN endpoint 0.

The mapping of the device’s USB endpoints to the UDC endpoints is shown in Tab le 5-1 . As can be seen, one IN and

two OUT endpoints on the UDC are not utilized.

5.2 Control Endpoint

The Control endpoint is handled by the CTL (USB Control) module. The CTL module is responsible for handling stan-

dard USB requests, as well as USB vendor commands. The UDC does not handle USB commands. These commands

are passed to the CTL for completion.

5.2.1 USB STANDARD COMMAND PROCESSING

This section lists the supported USB standard device requests. The basic format of a device request is shown in section

9.3 of the USB 2.0 and 3.1 Gen 1 specifications and the standard device requests are described in section 9.4. Valid

values of the parameters are given below.

Per the USB specifications, if an unsupported or invalid request is made to a USB device, the device responds by return-

ing STALL in the Data or Status stage of the request. Receipt of an unsupported or invalid request does NOT cause the

optional Halt feature on the control pipe to be set.

For each request supported, the USB specifications provide details on the device behavior during the various configu-

ration states and on the conditions which will return a Request Error. Some requests affect the state of the hardware.

Table 9-9 of the USB 3.1 Gen 1 specification lists the events that affect the various parameters.

In order to implement the Get Descriptor command, the CTL manages a 128x32 Descriptor RAM. The RAMs contents

are initialized via the EEPROM or OTP, after a system reset occurs. The Descriptor RAM may also be programmed by

the device driver to support EEPROM-Less mode.

TABLE 5-1: DEVICE TO UDC ENDPOINT MAPPING

Endpoint Function USB EP Number

Control OUT 0

Control IN 0

unused NA

Bulk IN 1

Bulk OUT 2

unused NA

Interrupt IN 3

 2015 - 2018 Microchip Technology Inc. DS00001992G-page 17

LAN7800

When the UDC decodes a Get Descriptor command, it will pass a pointer to the CTL. The CTL uses this pointer to deter-

mine what the command is and how to fill it.

5.2.1.1 Clear Feature

This request varies between USB2.0 (HS, FS) and USB3.1 Gen 1 (SS) modes.

5.2.1.1.1 USB 2.0

bmRequestType - 00h for the device, 01h for interfaces and 02h for endpoints.

wValue - Specifies the feature, 1=Device_Remote_Wakeup and 0=Endpoint_Halt.

wIndex - Always 0 when the device is selected, specifies the interface number (always 0) when an interface is selected

or the direction/endpoint number (0, 80h, 81h, 2 or 83h) when an endpoint is selected.

A ClearFeature(Endpoint_Halt) request will clear the USB 2.0 data toggle for the specified endpoint.

5.2.1.1.2 USB 3.1 Gen 1

bmRequestType - 00h for the device, 01h for interfaces and 02h for endpoints.

wValue - Specifies the feature, 0=Endpoint_Halt (for endpoints), 0=Function_Suspend (for interfaces), 48=U1_Enable,

49=U2_Enable and 50=LTM_Enable.

wIndex - Always 0 when the device is selected, specifies the interface number (always 0) when an interface is selected

or the direction/endpoint number (0, 80h, 81h, 2 or 83h) when an endpoint is selected.

A ClearFeature(Endpoint_Halt) request will reset the USB 3.1 Gen 1 sequence number for the specified endpoint.

5.2.1.2 Get Configuration

All parameters are fixed per the USB specifications.

5.2.1.3 Get Descriptor

wValue - The high byte selects the descriptor type. The supported descriptors for this command are 1=Device, 2=Con-

figuration (including Interface, Endpoint descriptors and Endpoint Companion descriptors (USB 2.1 LPM/USB 3.1 Gen

1)), 3=String, 6=Device Qualifier (HS/FS), 7=Other Speed Configuration (USB2.0) and 15=BOS (USB3.1 Gen 1 only).

The low byte selects the descriptor index and must be 0.

wIndex - Specifies the Language ID for string descriptors or is 0 for other descriptors.

wLength - Specifies the number of bytes to return. If the descriptor is longer than the wLength field, only the initial bytes

of the descriptor are returned. If the descriptor is shorter than the wLength field, the device indicates the end of the con-

trol transfer by sending a short packet when further data is requested. A short packet is defined as a packet shorter than

the maximum payload size or a zero length data packet.

5.2.1.4 Get Interface

wIndex - Specifies the interface, always 0 for this device.

TABLE 5-2: STRING DESCRIPTOR INDEX MAPPINGS

INDEX STRING NAME

0 Language ID

1 Manufacturer ID

2 Product ID

3 Serial Number

4 Configuration String

5 Interface String

Note: Direct access to the Interface, Endpoint and Endpoint Companion (USB 2.1 LPM/USB3.1 Gen 1) descrip-

tors are not supported by this command and will cause a USB stall. Access to USB 3.1 Gen 1 only descrip-

tors while in USB 2.0 mode and access to HS and FS descriptors while in USB 3.1 Gen 1 mode are not

supported by this command and will cause a USB stall.

LAN7800

DS00001992G-page 18  2015 - 2018 Microchip Technology Inc.

5.2.1.5 Get Status

bmRequestType - 00h for the device, 01h for interfaces and 02h for endpoints.

wIndex - Always 0 when the device is selected, specifies the interface number (always 0) when an interface is selected

or the direction/endpoint number (0, 80h, 81h, 2 or 83h) when an endpoint is selected.

5.2.1.6 Set Address

wValue - Specifies the new device address.

Per the USB specification, the USB device does not change its device address until after the Status stage of this request

is completed successfully. This is a difference between this request and all other requests. For all other requests, the

operation indicated must be completed before the Status stage.

5.2.1.7 Set Configuration

wValue - The lower byte specifies the configuration value.

The device supports only one configuration. A value of 1 places the device into the Configured state while a value of 0

places the device into the Address state.

The Halt feature is reset for all endpoints upon the receipt of this request with a valid configuration value.

The USB 2.0 data toggle and the USB 3.1 Gen 1 sequence numbers for all endpoints are initialized upon the receipt of

this request with a valid configuration value.

5.2.1.8 Set Descriptor

This optional request is not supported and the device responds by returning STALL.

5.2.1.9 Set Feature

This request varies between USB 2.0 (HS, FS) and USB 3.1 Gen 1 (SS) modes.

5.2.1.9.1 USB 2.0

bmRequestType - 00h for the device, 01h for interfaces and 02h for endpoints.

wValue - Specifies the feature, 1=Device_Remote_Wakeup, 2=device Test_Mode, 0=Endpoint_Halt.

wIndex - Specifies the interface number (always 0) when an interface is selected or the direction/endpoint number (81h,

2 or 83h) when an endpoint is selected. When the device is selected, this field is always 0 unless device Test_Mode is

selected via wValue, in which case the upper byte is the Test Selector and the lower byte a 0.

Note: In USB 3.1 Gen 1 (SS) mode, only the lower byte of wIndex is used for the endpoint number.

The returned data for a device varies between USB 2.0 (FS, HS) and USB 3.1 Gen 1 (SS) modes, with

USB 3.1 Gen 1 mode also returning LTM Enable, U2 Enabled and U1 Enabled. Also, the Remote Wakeup

field is reserved and must return 0 for USB 3.1 Gen 1 (SS) mode.

The returned data for the first interface varies between USB 2.0 (FS, HS) and USB 3.1 Gen 1 (SS) modes,

with USB 3.1 Gen 1 (SS) mode returning Function Remote Wakeup and Function Remote Wakeup Capa-

ble.

Note: Power Method (PWR_SEL) in Hardware Configuration Register (HW_CFG) is used as the source for the

Self-Power bit (D0).

Note: Endpoint_Halt is not implemented for Endpoint 0.

 2015 - 2018 Microchip Technology Inc. DS00001992G-page 19

LAN7800

5.2.1.9.2 USB 3.1 Gen 1

bmRequestType - 00h for the device, 01h for interfaces and 02h for endpoints.

wValue - Specifies the feature, 0=Endpoint_Halt (for endpoints), 0=Function_Suspend (for interfaces), 48=U1_Enabe,

49=U2_Enable and 50=LTM_Enable.

wIndex - When an endpoint is selected, the lower byte specifies the direction/endpoint number (81h, 2 or 83h), when

the device is selected this field is always 0 and when an interface the lower byte specifies the interface (always 0). For

the Function_Suspend feature, the upper byte specifies the suspend options. Bit 0=Low power suspend state and bit

1=Function Remote Wake Enable.

5.2.1.10 Set Interface

wValue - Specifies the alternate setting (must be 0).

wIndex - Specifies the interface (always 0).

Only one interface with one setting is supported by the device. If the command is issued with an

interface other than 00h, the device responds with a Request Error. If the command is issued with an

interface setting of 00h but with an alternative setting other than 00h, the device responds with a

STALL.

The Halt feature is reset for all endpoints upon the receipt of this request with valid interface and

alternate setting values.

The USB 2.0 data toggle and the USB 3.1 Gen 1 sequence numbers for all endpoints are initialized

upon the receipt of this request with valid interface and alternate setting values.

5.2.1.11 Set Isochronous Delay

All parameters are fixed per the USB 3.1 Gen 1 specification.

Although there are no isochronous endpoints the device must accept this request and silently discard it.

5.2.1.12 Set SEL

All parameters are fixed per the USB 3.1 Gen 1 specification.

This command is accepted by the device. The U1 Exit Latency Register (U1_LATENCY) and U2 Exit Latency Register

(U2_LATENCY) are updated accordingly. SET Select (SET_SEL) in USB Status Register (USB_STATUS) and USB Sta-

tus Interrupt (USB_STS_INT) in Interrupt Status Register (INT_STS) are also asserted. USB_STS_INT is asserted in

the Interrupt EP if configured.

5.2.1.13 Sync Frame

There are no isochronous endpoints in this device. The device will respond with a Stall to this request.

5.2.2 USB VENDOR COMMANDS

The device implements several vendor specific commands in order to directly access CSRs and efficiently gather sta-

tistics. The memory map utilized by the address field is defined in Table 15-1, “Memory Map,” on page 145.

Note: Endpoint_Halt is not implemented for Endpoint 0.

Note: This command is only supported for USB 3.1 Gen 1. When not operating in super-speed mode the device

will Stall this request.

Note: This command is only supported for USB 3.1 Gen 1. When not operating in super-speed mode the device

will Stall this command.

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