com (Member) Edited by User1632152476299482873 September 25, 2021 at 3:04 PM. The PCS Interface is precisely defined as the 10 Gigabit Media Independent Interface (XGMII) in Clause 46. 802. It supports 10M/100M/1G/2. When the MAC RX receives a local fault, the MAC TX starts sending remote fault status (0x0200009c) on the XGMII. In any case, the base concept is still the same - I don't think that your SFP module understands that it's communicating with a USXGMII core on the MAC side, which is why it's failing to complete AN and failing to get a link established. 0 IPK is also supported. The xgmii_tx_control bit corresponds to the xgmii_tx_data bits. Could you please guide me?With LX2160ARDB Yocto, it looks like I ran into the same problem when booting from SD card. For Ethernet backplane applications, XGMII compliant 10GBASEKR_PHY soft IP is developed. rst)10 ギガビット イーサネット PCS/PMA (10GBASE-R) は、10 ギガビット イーサネット MAC への接続に XGMII インターフェイスを提供し、10. 1. 1, 2. PHY is the physical media you attach to (Cat5/6 cable, or fiber, or WiFi). IP Facts LogiCORE IP Facts Table Core Specifics Supported Device Family(1)(2) 10GBASE-R: UltraScale™ Zynq®-7000 SoC,10-Gbps Ethernet MAC MegaCore Function user guide ›. The XGMII has an optional physical instantiation. {"payload":{"allShortcutsEnabled":false,"fileTree":{"rtl":{"items":[{"name":"arp. So, this will create the dts/dtsi files. It is called XSBI (10 Gigabit Sixteen Bit Interface). Core10GMAC is configured for XGMII mode with a core data width of 64 bits. 1 Overview. SWAP C. In this demo, the FiFo_wrapper_top module provides this interface. 3定義的以太網行業標準。. 它包括一個數據接口，以及一個MAC和PHY之間的管理接口 (圖1)。. Part Details. Out : 4 : Control bits for each lane in xgmii_tx_data[]. 7. 25 MHz Parallel IEEE standard XFI (“Ziffie”) 10 Gbit/s 1 Lane 4 10. Basically, you can think of the SFP+ to BASE-T module as a media converter - it receives 10GBASE-R on one end, and produces 10GBASE-T on the other end, and vise versa. 8 GHz in dynamIQ configuration. The design in CORE Generator contains necessary updates for Virtex-II and later devices. Generate the design example from the Example Design tab of the LL 10GbE Intel® FPGA IP parameter editor. World class engineering and mixed-signal design. com! 'Ten Gbps Media Independent Interface' is one option -- get in to view more @ The Web's largest and most authoritative acronyms and abbreviations resource. The device is also equipped with an additional full-rate data port that can be utilized for bypass monitoring or channel monitoring applications. All hardware requirements listed apply to use with Linux. PMA Registers 5. SoCKit/ Cyclone V FPGA A. 2. 4. VIVADO. The 10G USXGMII Ethernet design example demonstrates the functionalities of the LL 10GbE MAC Intel® FPGA IP core operating at 10M, 100M, 1G, 2. 0 IEEE 802. 18. Core data width is the width of the data path connected to the USXGMII IP. 25 Gb/s 的速率下支持 20G 双速率 XAUI（两倍 XAUI）. Looking for the definition of XGMII? Find out what is the full meaning of XGMII on Abbreviations. 2. Serdes Lane A is connected to a Broadcom Ethernet switch on the board via SGMII. 面向 XAUI 应用的单芯片解决方案. 2. So to test initially I taken Example design of PCS/PMA IP and there I altered 1) ctl_loopback bit 1-> 0 (not setting in loop back) . Key Features VMDS-10446 VSC8514-11 Datasheet Revision 4. Altera Low Latency Ethernet 10G MAC IP Core Migration Guidelines. XAUI PHY 1. Simply, it uses 8bits of control logic. // Documentation Portal . LAN の主流であるイーサネットで初めて WAN での利用を前提とした技術を含む [1] 。. status instance: The stp screenshot shows that both channel 0 and 1 are ready with resets de-asserted. MSRP. Intelligent Screen Adaption Technology. Due to the continuously signaled nature of the underlying PMA, and the encoding performed by the PCS, the 10GBASE-X PCS maps XGMII data and control characters into a code-group stream. The transceivers do not support the XGMII interface to the MAC/RS as defined in the IEEE 802. Introduction. 5G/5G/10G Multi-rate Ethernet PHY Intel® FPGA IP core for Intel® Stratix® 10 devices (L- and H-tiles) implements the Ethernet protocol as defined in the IEEE 802. Introduction. 0 technology, MoGo 2 Pro delivers a professional visual experience in a. Remember the XGMII encoding is 1bit of control (0b -> data, 1b -> control) for every 8bits of data. 5GPII Word • 3) Allow variation in the minimum IPG at the XGMII – Allow packets to be held back until the next lane 0 alignment, and make up by shrinking a subsequent IPG. XGMII and to reduce the number of interface signals. 5G/5G Copper HDD Study Group IEEE P802. Though the XGMII is an optional interface, it is used extensively in this standard as a basis for specification. Most Ethernet systems are made up of a number of building blocks. • /T/-Maps to XGMII terminate control character. NBASE-T Alliance 白 1 概述 十年来，企业网络访问层的配备已能满足其大部分 1000BASE-T 以 太网的吞吐量需求，但这项全能技术已经濒临淘汰。Which looks remarkably similar to how the XGMII encoding looks, but its not. That being said, there may be an assumption made that a 10 Gb/s MAC/RS/XGMII implementationThe TLK3134 can be optionally configured as a XAUI or 10GFC transceiver. Experience unforgettable entertainment with products like the 4K XGIMI HORIZON Pro, ultra-portable XGIMI Halo+, or our new laser projector XGIMI AURA. Network Management. Two XGMII data transfers are decoded from each block. MAC – PHY XLGMII or CGMII Interface. 3 Overview (Version 1. 2. 10 Gigabit Media Independent Interface (XGMII) or 10 Gigabit Attachment Unit Interface (XAUI) WWDM LAN PHY (8B/10B) Serial PMD 1310 nm Serial PMD 1550 nm Serial PMD 850 nm WWDM PDM 1310 nm Serial PMD 1550 nm Serial PMD 1310 nm Serial PMD 850 nm Serial LAN PHY (64B/66B) Serial WAN PHY (64B/66B + WIS) Figure 1. 3 media access control (MAC) and reconciliation sublayer (RS). 즉, 클럭의 상승. Native PHY IP Ports for 10GBASE-R and 10GBASE-R. The design in CORE Generator contains necessary updates for Virtex-II and later devices. Behavior of the MAC TX in custom preamble mode: PCS service interface is the XGMII defined in Clause 46. 2. 3 の第 49 項で定義されている BASE-R PCS/PHY (Physical Coding Sublayer/Physical Layer) を採用し、10M、100M、1G、2. 1AS profile making it ideal for TSN applications. xgmii_tx_clk : Input . Auto-Negotiation Advertisement (#4) 5. IP Core Generation Output ( Intel® Quartus® Prime Pro Edition) 2. 1 The right side of the readout board is a high-density connectorall copies or substantial portions of the Software. The IEEE 802. Lane 0 starts from the least significant bit. XGMII Update Page 4 of 12 hmf 11-July-2000 IEEE 802. This greatly reduces. SerDes TX RX MII Serial Optional APB Multi-Speed MAC PCSR_X Clock and Reset Arm® AMBA® Bus Fabric Figure 1: Example system-level block diagram Benefits f Ease of use—Customizable with. supports bi-directional data flow and can be deployed multiple ways: • Interface Conversion: Connect data steams between flight units using XAUI and test systems using 10GigE. 7. USXGMII. Our MAC stays in XFI mode. g. •. The core was released as part of Xenie FPGA module project. 3 by 4. Loading Application. IN NO EVENT SHALL THE. The MAC core performs the Link function of the 10Gb Ethernet standard. Like Liked Unlike Reply 1 like. Generate the design example from the Example Design tab of the LL 10GbE Intel® FPGA IP parameter editor. Resources Developer Site; Xilinx Wiki; Xilinx Github SoCs/PCs may have the number of Ethernet ports. 2, OpenCL up to. Port name in U-Boot. 0 5 Network Controller Sideband Interface (NC-SI) 6 Specification 7 Document Type: Specification 8 Document Status: DMTF Standard 9 Document Language: EI read ethernet 1000base user guide but that is not clear for me what is difference between SGMII and ethernet 1000base? In their definition was written : Ethernet 1000base : The IEEE802. 2. 265625 Mhz when select PMA bus width of 32 bits (in picture, it says a number for 40 bit wide bus), and tx_coreclkin is 156. 2. Features. 3ae 10 Gigabit Ethernet 10 Gigabit Media Independent Interface n 32 data bits, 4 control bits, one clock, for transmit n 32 data bits, 4 control bits, one clock, for receive n Dual Data Rate (DDR) signaling, with data and control driven and sampled on both rising edge and falling edge of clockXGMII – 10 Gb/s Medium independent interface. """ def __init__ (self, signal: SimHandleBase, clock: SimHandleBase, interleaved: bool = True): """Args: signal: The XGMII data bus. MAC – PHY XLGMII or CGMII Interface. A separate APB interface allows the host applications to configure the Controller IP for Automotive. 14. In the transmit direction, data is encoded beginning with a XGMII frame format. Introduction to Intel® FPGA IP Cores 2. Series Number: 207129. Comcores timing solution support s IEEE 1588 PTP profiles such as IEEE Default and P eer-to- P eer, as well as ITU-T. • The SONET family of integrated, CMOS-based transceivers for OC-3 to OC-192 based applica-tions features multi-rate SerDes that incorporate MUX, de-MUX and CDR functions. 3bz Task Force – Pittsburg, PA May 2015 5 • 10G XGMII (Clause 46) - Logical o 32-bit DDR TXD, 4-bit TXC and TX_CLK o 32-bit DDR RXD, 4-bit RXC and RX_CLK XGXS (Clause 47) – XAUI Electrical Spec (PMA) o 4 SERDES TX and 4 SERDES RX (PCS 8B/10B) @ 3. When using the 2017. IEEE 802. GMII Signals. Ethernet port mapping. Table 13. QSGMII Specification: EDCS-540123 Revision 1. You can dynamically switch the PHY. MII即媒體獨立接口，也叫介質無關接口。. 3125 Gbps のシリアル シングル チャネルの PHY をインプリメントして、XFI 電気的仕様を使用した XFP への直接接続や、SFI 電気的仕様を使用した SFP+ オプティカル. XGMII 10 Gbit/s 32 Bit 74 156. Memory specifications. USGMII and USXGMII Summary USGMII Specification The Universal Serial Gigabit Media Independent Interface (USGMII) is an. This table shows the mapping of this non‑standard format to the standard SDR XGMII interface. Utilization of the Ethernet protocol for connectivity is widespread in a broad range of things or devices around us. The two most important are the Ethernet MAC Device (the device that actually makes and receives Ethernet frames), and the Ethernet PHY (PHYsical interface) device - the device that connects you to your wires, fibre, etc. Processor specifications. The modules are capable of operating with XGMII interface widths of 32 or 64 bits. . The core was released as part of Xenie FPGA module project. 20. •. speed XGMII Attachment Unit Interface (XAUI) to transmit or receive data. 4 core product guide only lists SGMII LVDS support for Virtex-7 and Kintex-7 devices. xgmii. TX FIFO E. 1. The XGMII interface defines the 32-bit data and 4-bit wide control character clocked between the MAC/RS and the PCS at both the positive and negative edge (double data rate – DDR) of the 156. 5GPII Implementation as shown does not require much incremental logic Does not preclude implementations that directly map XGMII into PCS Diagram above for IEEE functional specification purposes only 1000BASE-X PHY 2. 數據接口包括分別用於發送器和接收器的兩條獨立信道。. Simulating Intel® FPGA IP Cores 2. 49. Native PHY IP Parameter Settings for 10GBASE-R and 10GBASE-R with IEEE 1588v2 2. This PHY IP core is made available as part of the transceiver functionality of the Intel® FPGAs. 3bz-2016 amending the XGMII specification to support operation at 2. 3 2 of 20 August 3, 2009 Change History Definitions MII – Media Independent Interface: A digital interface that provides a 4-bit wide datapath between a 10/100 Mbit/s PHY and a MAC sublayer. 5G, 5G, and 10G. Leverages DDR I/O primitives for the optional XGMII interface. I looked at many different examples, including xapp1305, in order to determine the correct DTS snippet to put in system-user. 3u）。介质独立的意思是指，MAC与PHY之间的通信不受具体传输介质（双绞线或光纤等）的影响，任何MAC和PHY都可以通过MII接口互连。 MAC与PHY之间的MII连接可以是可插拔的连… XGMII Encapsulation. SERIAL TRANSCEIVER. v","path":"rtl/arp. Reconfiguration Signals 6. The 10GBASE-KR standard is always provided with a 64-bit data width. Justin Steve Augusta wrote: > Justin, > > As currently proposed, I don't think the XGMII forces one out of. For example, xgmii_tx_control [0] corresponds to xgmii_tx_data [7:0], xgmii_tx_control [1] corresponds to xgmii_tx_data [15:8], and so on. The eight lanes of data and control transferred per clock cycle on XLGMII/CGMII are equivalent to a column in the following description of link fault signaling. • There is a PCS Clause 49 blocks with additional ordered sets • Auto-neg messages usign 16-bit configuration word • 5. Fundamentally the MII,SGMII,RGMII signals are for data that a MAC device converts to PHY. XGMII Encapsulation. Regards, Pat -----Original Message----- From: Justin Gaither [mailto:jgaither@xxxxxxxxxxxxxxx] Sent: Wednesday, February 14, 2001 11:29 AM To:. The XAUI interface used in conjunction with the XGMII , The purpose of XGMII is to provide a simple, inexpensive, and easy to implement interconnection between the MAC sublayer and the PHY . 2. Transmit frames received from the client on the Avalon® streaming interface are big endian. (associated with MAC pacing). The MAC core along with FIFO-core and SPI4/AXI-DMA engines or deleted depending on the XGMII idle inserted or deleted. Linking CPUs with R/GMII Interfaces to SGMII-Based Switches ENT-AN0055 VPPD-01208 VSC8211 Revision 1. 1: Enables USXGMII Auto-Negotiation, and automatically configures operating speed with link partner ability advertised during USXGMII Auto. For Ethernet backplane applications, XGMII compliant 10GBASEKR_PHY soft IP is developed. • Data Capture: Record data packets in-line between twoSystem dimensions. PCS B. Status Word (#1) 3. Supports 10-Gigabit Fibre Channel (10-GFC. Microsemi's 10GE PHY portfolio is highly flexible, covering a broad range of port speeds and interface types. As a result the above text only applies to XGMII 10 Gb/s operation and IEEE 802. The standard XLGMII or CGMII implementation consists of 32 bit wide data bus. Rockchip RK3588 datasheet. 3ae として標準化された。. • Industry-compatible LVDS SerDes devices provide high-performance serial solutions for next-generation systems. PCS service interface is the XGMII defined in Clause 46. Understanding the Ethernet Nomenclature – Data Rates, Interconnect Mediums and Physical Layer. 7. It is easier to just create this in HSI. . Register Interface Signals 5. 万兆位以太网 PCS/PMA (10GBASE-R) 是一款免费 LogiCORE™，不仅可为万兆位以太网 MAC 提供一个 XGMII 接口，而且还可实现 10. The 1000BASE-X PCS/PMA or SGMII v11. Read clock. The PHY side of the MAC implements the XLGMII or CGMII protocol as defined by the IEEE 802. On the opposite side a pair of XGMII interfaces are used to transfer frames between the nfmac10g and the PCS/PMA (or XAUI) core. See the 5. 1G/10GbE PHY Register Definitions 5. The PHY we have on the LS1046A RDB supports native XFI but sends PAUSE frames towards the MAC to regulate the lower speeds. Support to extend the IEEE 802. 15625/10. Intelligent Screen Adaption Technology. The 10 Gigabit Media Independent Interface (XGMII) is an interface standard that uses 72 data pins for both RX and TX. LS1043ARDB Ethernet and FMC port mapping. 1Q, and multicast. Version 1. Fair and Open Competition. It supports 10M/100M/1G/2. Resources Developer Site; Xilinx Wiki; Xilinx GithubVMDS-10298. Design greater bandwidth and feature-rich network equipment with Microsemi's 10 Gigabit Ethernet (GE) physical layer (PHY) transceiver ICs. The MAC TX also supports custom preamble in 10G operations. RF & DFE. 4. It looks like all of the latest 10GE IP from Xilinx no longer has an MDIO to interface to external PHYs. 1. An optional physical instantiation of the PMA service interface has also been defined (see Clause 51). System battery specifications. Operating Speed and Status Signals. are all MAC to PHY interfaces. The MAC TX also supports custom preamble in 10G operations. Chassis weight. 10GBASE-X andInterface (XGMII)) Change 46. 2. class XGMII (Driver): """XGMII (10 Gigabit Media Independent Interface) driver. 5. Each XAUI comprises four self-timed 8b10b encoded serial lanes each. PMA 2. from_payload(b'test data')) # wait for operation to complete (optional) await xgmii_source. Optional 802. . PRESENTATION. The full spec is defined in IEEE 802. 3 Clause 46 but we will save you the legalize parse time and explain it in plain English. 5Gb/s, 5Gb/s, and 10Gb/s Physical Coding Sublayers (PCS) are specified to the XGMII, so if not implemented, a conforming implementation shall behave functionally as if the RS and XGMII were implemented. Hi all , I'm using the zcu102 Ultrascale board for XGMII core with using PCS/PMA IP only. nsy_0415@hotmail. rxc, dut. Like. Media-independent interface#XGMII To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. xgmii mdi up to 10 gbps clt – coax line terminal cnu – coax network unit mdi – medium dependent interface oam – operations, administration, & maintenance pcs – physical coding sublayer phy – physical layer device pma – physical medium attachment pmd – physical. PROGRAMMABLE LOGIC, I/O & BOOT/CONFIGURATION. With efficient design and a high level of integration, Alaska F and Alaska G PHY devices offer low power. Users can play video games or stream directly from the Android TV interface. versionchanged:: 1. The XAUI PHY Intel® FPGA IP core allows you to easily build systems with a very high throughput 10G Ethernet connection. 17. The goal of the firmware is to apply multiple SiTCP cores as Gigabit protocol stack in the pixel detector’s readout system, then convert the data into 10-Gigabit proto-Fig. The Bottom Line. 17. The XGMII design in the 10-Gig MAC is available from CORE. The Low Latency Ethernet 10G MAC supports link fault generation and detection. 1. 10G Ethernet SubsystemのPCSとは、XGMIIというインターフェース規格に基づいてEthernetフレームの内容をやりとりします。 また、10G Ethernetを使うユーザー・ロジックとは、イーサネット経由で送受信するヘッダ及びペイロードをAXI4 Stream経由でやりとりします。 Table 48. The XGMII Clocking Scheme in 10GBASE-R 2. XGMII interleaver for interfacing with PHY cores that interleave the control and data lines. 1 Enjoy sharp imagery with realistic colors without worrying about having to adjust your living space to fit your projector display. Several Physical Coding Sublayers known as 10GBASE-X, 10GBASE-R, and10GBASE-W are specified, as well as significant additional supporting material for a 10 GigabitMedia Independent Interface (XGMII), a 10 Gigabit Attachment. Leverages DDR I/O primitives for the optional XGMII interface. If you have a related question, please click the "Ask a related question" button in the top right corner. Code replication/removal of lower rates onto the 10GE link. Viewed 4k times. The purpose of this interface is to provide a simple interconnection betweenSupport to extend the IEEE 802. 125 Gbps at the PMD interface. It encodes 64-bit XGMII data and 8-bit XGMII control into 10GBASE-R 66-bit control or data blocks in accordance with Clause 49 of the IEEE802. Figure 49–4 depicts the relationship and mapping Media Independent Interface ( MII )，介质独立接口，起初是定义100M以太网（Fast Ethernet）的 MAC 层与 PHY 芯片之间的传输标准（802. 5. 14. XGIMI has helped many worldwide create lasting memories with our innovative, leading line of home, portable, and laser projectors. 25 inches (HWD), which is a comfortable fit for carrying in one hand, at least for my. 3 and earlier - PCS Only - Data errors seen if RX XGMII/XXVGMII interface clocked by tx_out_clk. 49. Benefits Media port speed • 8-port, 3-speed PHY, operating at 10, 100 Mbps, or 1Gbps data rates on UTP copper linesThe devicetree can be created in SDK/Vitis, or from the command line using the XSCT (Xilinx Software Commandline Tool) commands (The latter flow is in the wiki I posted earlier). xGMII interface. Designed to IEEE 802. I am checking if there might be some lack of robustness with this scheme. We are using the 10G/25G Ethernet Subsystem for 10G with PCS only. Enjoy screen sizes between 60"-120" and supersize all your movies, video games, and little. 3ae で規定された。 2002年に IEEE 802. Processor specifications. RS/XGMII • Status messages are four bytes in length and conveyed on a single XGMII clock. Optional 802. . If used internally, it no longer must meet those, and a few other specifications, so that should not be an argument. 19. rst) xgmii_sink = XgmiiSink(dut. Currently, this network device driver is for all STi embedded MAC/GMAC (i. 6. PROGRAMMABLE LOGIC, I/O & BOOT/CONFIGURATION. 4. The F-tile 1G/2. 它是IEEE-802. CTRL is inserted. XAUI. The 10GBASE-R PHY uses the XGMII interface to connect to the IEEE802. 5G/5G/10G speeds based on packet data replication. Arm Mali-G610 MP4 “Odin” GPU with support for OpenGLES 1. Since we have the datasheet, we can confirm some of the specifications of RK3588, and get additional details: CPU – 4x Cortex-A76 @ up to 2. 1. (3) The WAN interface sublayer (WIS) implements the OC-192 framing and scrambling functions. Part Number: 2002182200. Interface Signals 7. This. Virtually Install CentOS and Fedora on Zynq UltraScale+. 2. First, when I use default DIP setting from user guide (boot from SD) Boot source. 0 1 1 Product Overview The VSC8514-11 device is a low-power Gigabit Ethernet transceiver with copper media interfaces. XGMII (10 gigabit MII, "X"はローマ数字で10を意味する) は、10Gbps通信用途の MII。2002年に IEEE 802. As Linux is running on the ARM system, a specific IMX547 driver is used. Microsemi's 10GE PHY portfolio is highly flexible, covering a broad range of port speeds and interface types. If we scale that to 64b worth of data it becomes 64b/72b encoding with an overhead of 8b (of control) / 64b (of data) = 12. 10 Gigabit Attachment Unit Interface ( XAUI / ˈzaʊi / ZOW-ee) is a standard for extending the XGMII (10 Gigabit Media Independent Interface) between the MAC and PHY layer of 10 Gigabit Ethernet (10GbE) defined in Clause 47 of the IEEE 802. The 2. 它是IEEE-802. HORZON Pro packs a beaming bright 1500 ISO Lumens that provides stellar brightness any time of day, even in rooms with tons of ambient light. Frames transmitted on the XGMII are little endian; the MAC TX therefore transmits frames on this interface from the least significant. 3ae 10 Gigabit Ethernet 10 Gigabit Media Independent Interface n 32 data bits, 4 control bits, one clock, for transmit n 32 data bits, 4 control bits, one clock, for receive n Dual Data Rate (DDR) signaling, with data. 1G/10GbE Control and Status Interfaces 5. 3-2008, defines the 32-bit data and 4-bit wide control character. 4 pounds, not including its external AC adapter, and it measures 6. 0 3 3 A Managed Switch System A managed switch system is composed of at least an Ethernet switch chip, several physical layer devicesThe core is aimed to be used for 10 G Ethernet in both optic and metallic version (64bit XGMII internal interface). Figure 46–1 shows the relationship of the RS and XGMII to the ISO/IEC (IEEE) OSI reference model. By grouping them in a QSGMII, only one SERDES interface is needed to be used, so only 1 Tx and 1 Rx (2 in total) differential lines are routed. • /S/-Maps to XGMII start control character. When asserted, indicates the start of a new frame from the MAC. Overview. 10G/2. 5 Gb/s and 5 Gb/s XGMII operation. PHYs that provide an XGMII shall support the 10 Gb/s MAC data rate. 5G/5G/10G (USXGMII). 3-2008, defines the 32-bit data and 4-bit wide control character. However, the bus widths of the xgmii interfaces on the MAC and XAUI do not match. Turn on suggestions. Through the parallel use of the 25GMII and XGMII, the following modes are supported: — Symmetric-rate operation for transmit and receive data paths at 25 Gb/s, 50 Gb/s, or 100 Gb/s, utilizing all of the functionality of the 25GMII defined in Clause 106. If the 32-bit/64-bit adapter on the XGMII is present, the first byte of receive packets must. 它包括一個數據接口，以及一個MAC和PHY之間的管理接口 (圖1)。. Hi, The critical warning message is just that, nothing more.