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KSZ8851SNLI TR

KSZ8851SNLI TR

  • 厂商:

    ACTEL(微芯科技)

  • 封装:

    -

  • 描述:

  • 数据手册
  • 价格&库存
KSZ8851SNLI TR 数据手册
KSZ8851SNL/SNLI Single-Port Ethernet Controller with SPI Features • Integrated MAC and PHY Ethernet Controller Fully Compliant with IEEE 802.3/802.3u Standards • SPI with Clock Speeds up to 40 MHz for High Throughput Applications • Supports 10BASE-T/100BASE-TX • Supports IEEE 802.3x Full-Duplex Flow Control and Half-Duplex Backpressure Collision Flow Control • Supports RXQ and TXQ FIFO DMA for Fast Data Read and Write Transfers • Supports IP Header (IPv4)/TCP/UDP/ICMP Checksum Generation and Checking • Supports IPv6 TCP/UDP/ICMP Checksum Generation and Checking • Automatic 32-bit CRC Generation and Checking • Supports Simple Command and Data Phases in SPI Cycle for RXQ/TXQ FIFO and Registers Read/Write • Supports Multiple Data Frames for TXQ FIFO and RXQ FIFO without Additional Command Phase • Supports Flexible Byte (8-bit), Word (16-bit) and Double Word (32-bit) Read/Write Access to Internal Registers • Larger Internal Memory with 12K Bytes for RX FIFO and 6K Bytes for TX FIFO. Programmable Low, High, and Overrun Watermark for Flow Control in RX FIFO • Efficient Architecture Design with Configurable Host Interrupt Schemes to Minimize Host CPU Overhead and Utilization • Powerful and Flexible Address Filtering Scheme • Optional to Use External Serial EEPROM Configuration for MAC Address • Single 25 MHz Reference Clock for Both PHY and MAC Power Modes, Power Supplies, and Packaging • Single 3.3V Power Supply with Options for 1.8V, 2.5V, and 3.3V VDD I/O • Built-In Integrated 3.3V or 2.5V to 1.8V Low Noise Regulator (LDO) for Core and Analog Blocks • Enhanced Power Management Feature with Energy Detect Mode to Ensure Low-Power Dissipation During Device Idle Periods • Comprehensive LED Indicator Support for Link, Activity and 10/100 Speed (2 LEDs) - User Programmable  2017-2021 Microchip Technology Inc. • • • • Low-Power CMOS Design Commercial Temperature Range: 0°C to +70°C Industrial Temperature Range: –40°C to +85°C Available in 32-pin (5 mm x 5 mm) QFN Package Additional Features In addition to offering all of the features of a Layer 2 controller, the KSZ8851SNL offers: • Supports Adding Two-Bytes Before Frame Header in Order for IP Frame Content with Double Word Boundary • LinkMD® Cable Diagnostic Capabilities to Determine Cable Length, Diagnose Faulty Cables, and Determine Distance to Fault • Wake-on-LAN Functionality - Incorporates Magic Packet™, Wake-Up Frame, Network Link State, and Detection of Energy Signal Technology • HP Auto MDI-X™ Crossover with Disable/Enable Option • Ability to Transmit and Receive Frames up to 2000 Bytes Network Features • 10BASE-T and 100BASE-TX Physical Layer Support • Auto-Negotiation: 10/100 Mbps Full- and HalfDuplex • Adaptive Equalizer • Baseline Wander Correction Applications • Video/Audio Distribution Systems • Voice over IP (VoIP) and Analog Telephone Adapters (ATA) • Building Automation • Industrial Control Sensor Devices (Temperature, Pressure, Levels, and Valves) • Security, Motion Control, and Surveillance Cameras Markets • • • • Fast Ethernet Embedded Ethernet Industrial Ethernet Embedded Systems DS00002381C-page 1 KSZ8851SNL/SNLI TO OUR VALUED CUSTOMERS It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and enhanced as new volumes and updates are introduced. If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via E-mail at docerrors@microchip.com. We welcome your feedback. Most Current Data Sheet To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at: http://www.microchip.com You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page. The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000). Errata An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision of silicon and revision of document to which it applies. To determine if an errata sheet exists for a particular device, please check with one of the following: • Microchip’s Worldwide Web site; http://www.microchip.com • Your local Microchip sales office (see last page) When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are using. Customer Notification System Register on our web site at www.microchip.com to receive the most current information on all of our products. DS00002381C-page 2  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI Table of Contents 1.0 Introduction ..................................................................................................................................................................................... 4 2.0 Pin Description and Configuration .................................................................................................................................................. 7 3.0 Functional Description .................................................................................................................................................................. 10 4.0 Register Descriptions .................................................................................................................................................................... 32 5.0 Operational Characteristics ........................................................................................................................................................... 72 6.0 Electrical Characteristics ............................................................................................................................................................... 73 7.0 Timing Specifications .................................................................................................................................................................... 75 8.0 Selection of Isolation Transformers .............................................................................................................................................. 79 9.0 Package Outline ............................................................................................................................................................................ 80 Appendix A: Data Sheet Revision History ........................................................................................................................................... 81 The Microchip Web Site ...................................................................................................................................................................... 82 Customer Change Notification Service ............................................................................................................................................... 82 Customer Support ............................................................................................................................................................................... 82 Product Identification System ............................................................................................................................................................. 83  2017-2021 Microchip Technology Inc. DS00002381C-page 3 KSZ8851SNL/SNLI 1.0 INTRODUCTION 1.1 General Terms and Conventions The following is list of the general terms used throughout this document: BIU - Bus Interface Unit The host interface function that performs code conversion, buffering, and the like required for communications to and from a network. BPDU - Bridge Protocol Data Unit A packet containing ports, addresses, etc. to make sure data being passed through a bridged network arrives at its proper destination. CMOS - Complementary Metal Oxide Semiconductor A common semiconductor manufacturing technique in which positive and negative types of transistors are combined to form a current gate that in turn forms an effective means of controlling electrical current through a chip. CRC - Cyclic Redundancy Check A common technique for detecting data transmission errors. CRC for Ethernet is 32 bits long. Cut-Through Switch A switch typically processes received packets by reading in the full packet (storing), then processing the packet to determine where it needs to go, then forwarding it. A cutthrough switch simply reads in the first bit of an incoming packet and forwards the packet. Cut-through switches do not store the packet. DA - Destination Address The address to send packets. DMA - Direct Memory Access A design in which memory on a chip is controlled independently of the CPU. EEPROM - Electronically Erasable Programmable Read-Only Memory A design in which memory on a chip can be erased by exposing it to an electrical charge. EISA - Extended Industry Standard Architecture A bus architecture designed for PCs using 80x86 processors, or an Intel 80386, 80486 or Pentium microprocessor. EISA buses are 32 bits wide and support multiprocessing. EMI - Electro-Magnetic Interference A naturally occurring phenomena when the electromagnetic field of one device disrupts, impedes or degrades the electromagnetic field of another device by coming into proximity with it. In computer technology, computer devices are susceptible to EMI because electromagnetic fields are a byproduct of passing electricity through a wire. Data lines that have not been properly shielded are susceptible to data corruption by EMI. FCS - Frame Check Sequence See CRC. FID - Frame or Filter ID Specifies the frame identifier. Alternately is the filter identifier. IGMP - Internet Group Management Protocol The protocol defined by RFC 1112 for IP multicast transmissions. IPG - Inter-Packet Gap A time delay between successive data packets mandated by the network standard for protocol reasons. In Ethernet, the medium has to be "silent" (i.e., no data transfer) for a short period of time before a node can consider the network idle and start to transmit. IPG is used to correct timing differences between a transmitter and receiver. During the IPG, no data is transferred, and information in the gap can be discarded or additions inserted without impact on data integrity. ISI - Inter-Symbol Interface The disruption of transmitted code caused by adjacent pulses affecting or interfering with each other. DS00002381C-page 4  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI ISA - Industry Standard Architecture A bus architecture used in the IBM PC/XT and PC/AT. Jumbo Packet A packet larger than the standard Ethernet packet (1500 bytes). Large packet sizes allow for more efficient use of bandwidth, lower overhead, less processing, etc. MDI - Medium Dependent Interface An Ethernet port connection that allows network hubs or switches to connect to other hubs or switches without a null-modem, or crossover, cable. MDI provides the standard interface to a particular media (copper or fiber) and is therefore 'media dependent.' MDI-X - Medium Dependent Interface Crossover An Ethernet port connection that allows networked end stations (i.e., PCs or workstations) to connect to each other using a null-modem, or crossover, cable. For 10/100 fullduplex networks, an end point (such as a computer) and a switch are wired so that each transmitter connects to the far end receiver. When connecting two computers together, a cable that crosses the TX and RX is required to do this. With auto MDI-X, the PHY senses the correct TX and RX roles, eliminating any cable confusion. MIB - Management Information Base The MIB comprises the management portion of network devices. This can include things like monitoring traffic levels and faults (statistical), and can also change operating parameters in network nodes (static forwarding addresses). MII - Media Independent Interface The MII accesses PHY registers as defined in the IEEE 802.3 specification. NIC - Network Interface Card An expansion board inserted into a computer to allow it to be connected to a network. Most NICs are designed for a particular type of network, protocol, and media, although some can serve multiple networks. NPVID - Non-Port VLAN ID The port VLAN ID value is used as a VLAN reference. PLL - Phase Locked Loop An electronic circuit that controls an oscillator so that it maintains a constant phase angle (i.e., lock) on the frequency of an input, or reference, signal. A PLL ensures that a communication signal is locked on a specific frequency and can also be used to generate, modulate, and demodulate a signal and divide a frequency. PME - Power Management Event An occurrence that affects the directing of power to different components of a system. QMU - Queue Management Unit Manages packet traffic between MAC/PHY interface and the system host. The QMU has built-in packet memories for receive and transmit functions called TXQ (Transmit Queue) and RXQ (Receive Queue). SA - Source Address The address from which information has been sent. TDR - Time Domain Reflectometry TDR is used to pinpoint flaws and problems in underground and aerial wire, cabling, and fiber optics. They send a signal down the conductor and measure the time it takes for the signal—or part of the signal—to return. UTP - Unshielded Twisted Pair Commonly a cable containing 4 twisted pairs of wires. The wires are twisted in such a manner as to cancel electrical interference generated in each wire, therefore shielding is not required. VLAN - Virtual Local Area Network A configuration of computers that acts as if all computers are connected by the same physical network but which may be located virtually anywhere.  2017-2021 Microchip Technology Inc. DS00002381C-page 5 KSZ8851SNL/SNLI 1.2 General Description The KSZ8851SNL is a single-chip Fast Ethernet controller consisting of a 10/100 physical layer transceiver (PHY), a MAC, and a Serial Peripheral Interface (SPI). The KSZ8851SNL is designed to enable an Ethernet network connectivity with any host microcontroller equipped with SPI interface. The KSZ8851SNL offers the most cost-effective solution for adding high-throughput Ethernet link to traditional embedded systems with SPI interface. The KSZ8851SNL is a single chip, mixed analog/digital device offering Wake-on-LAN technology for effectively addressing Fast Ethernet applications. It consists of a Fast Ethernet MAC controller, SPI, and incorporates a unique dynamic memory pointer with 4-byte buffer boundary and a fully usable 18 KB for both TX (allocated 6 KB) and RX (allocated 12 KB) directions in host buffer interface. The KSZ8851SNL is designed to be fully compliant with the appropriate IEEE 802.3 standards. An industrial temperature-grade version, the KSZ8851SNLI, is also available. Physical signal transmission and reception are enhanced through the use of analog circuitry, making the design more efficient and allowing for lower-power consumption. The KSZ8851SNL features a single 3.3V power supply with options for 1.8V, 2.5V, or 3.3V VDD I/O. The device includes an extensive feature set that offers management information base (MIB) counters and a fast SPI interface with clock speed up to 40 MHz. The KSZ8851SNL includes unique cable diagnostics feature called LinkMD®. This feature determines the length of the cabling plant and also ascertains if there is an open or short condition in the cable. Accompanying software enables the cable length and cable conditions to be conveniently displayed. In addition, the KSZ8851SNL supports Hewlett Packard (HP) Auto-MDIX thereby eliminating the need to differentiate between straight or crossover cables in applications. FIGURE 1-1: SYSTEM BLOCK DIAGRAM PME INTRN Power Management CSN QMU DMA Channel SCLK SI Serial Peripheral Interface (SPI) VDD_CO1.8 1.8V Low Noise Regulator RXQ 12KB TXQ 6KB SO Control I/O Registers X1 MIB Counters X2 EEPROM I/F DS00002381C-page 6 PLL Clock VDD_IO EEPROM Interface Host MAC 10/100 Base-T/TX PHY RXP RXM (Auto MDI/MDI-X) TXP TXM LinkMD® Cable Diagnostics LED Driver LED1 LED0  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI PIN DESCRIPTION AND CONFIGURATION 32-PIN 5 MM X 5 MM QFN ASSIGNMENT, (TOP VIEW) LED1 SI VDD_IO DGND SCLK SO CSN FIGURE 2-1: VDD_IO 2.0 32 31 30 29 28 27 26 25 LED0 PME INTRN DGND VDD_CO1.8 EDD_IO 1 24 2 23 6 19 EESK AGND 7 18 8 17 3 22 4 Pin Number AGND ISET 15 16 VDD_A1.8 EECS RXP RXM AGND TXP TXM 10 11 12 13 14 20 VDD_A3.3 5 9 TABLE 2-1: 21 Paddle Ground on Bottom of Chip DGND VDD_D1.8 DGND X2 X1 RSTN SIGNALS Pin Name Type Note 2-1 Description Programmable LED output to indicate PHY activity/status. LED is ON when output is LOW; LED is OFF when output is HIGH. LED indicators are defined as follows: — 1 LED0 Opu Chip Global Control Register: CGCR bit [9] — 0 (default) 1 LED1 (Pin 32 100BT ACT LED0 (Pin 1) LINK/ACT LINK Link (up) = LED On; Activity = LED Blink; Link/Act = LED On/Blink; Speed = LED On (100BASE-T); LED Off (10BASE-T)  2017-2021 Microchip Technology Inc. DS00002381C-page 7 KSZ8851SNL/SNLI TABLE 2-1: Pin Number SIGNALS (CONTINUED) Pin Name Type Note 2-1 Description 2 PME Opu Power Management Event (default active low) It is asserted (low or high depends on polarity set in PMECR register) when one of the wake-on-LAN events is detected by KSZ8851SNL. The KSZ8851SNL is requesting the system to wake up from low power mode. 3 INTRN Opu Interrupt Not An active low signal to host CPU to indicate an interrupt status bit is set. This pin needs an external 4.7 kΩ pull-up resistor. 4 DGND GND Digital IO ground. 1.8V regulator output . This 1.8V output pin provides power to pins 9 (VDD_A1.8) and 23 (VDD_D1.8) for core VDD supply. If VDD_IO is set for 1.8V then this pin should be left floating, pins 9 (VDDA_1.8) and 23 (VDD_D1.8) will be sourced by the external 1.8V supply that is tied to pins 25 and 30 (VDD_IO) with appropriate filtering. 5 VDD_CO1.8 P 6 EED_IO Ipd/O In/Out Data from/to external EEPROM Config Mode: The pull-up/pull-down value is latched as with/without EEPROM during power-up/reset. See Table 2-2 for details. 7 EESK Opd EEPROM Serial Clock A 4 µs (OBCR[1:0]=11 on-chip bus speed @ 25 MHz) or 800 ns (OBCR[1:0]=00 on-chip bus speed @ 125 MHz) serial output clock to load configuration data from the serial EEPROM. 8 AGND GND Analog ground. 9 VDD_A1.8 P 10 EECS Opd EEPROM Chip Select This signal is used to select an external EEPROM device. 11 RXP I/O Physical receive (MDI) or transmit (MDIX) signal (+ differential). 12 RXM I/O Physical receive (MDI) or transmit (MDIX) signal (– differential). 13 AGND GND 14 TXP I/O Physical transmit (MDI) or receive (MDIX) signal (+ differential). 15 TXM I/O Physical transmit (MDI) or receive (MDIX) signal (– differential). 16 VDD_A3.3 P 3.3V analog VDD input power supply with well decoupling capacitors. 17 ISET O Set physical transmits output current. Pull-down this pin with a 3.01 kΩ 1% resistor to ground. 18 AGND GND 19 RSTN Ipu DS00002381C-page 8 1.8V analog power supply from VDD_CO1.8 (pin 5) with appropriate filtering. If VDD_IO is 1.8V, this pin must be supplied power from the same source as pins 25 and 30 (VDD_IO) with appropriate filtering. Analog ground. Analog ground. Reset Not. Hardware reset pin (active low). This reset input must be held low for a minimum of 10 ms after stable supply voltage 3.3V.  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 2-1: SIGNALS (CONTINUED) Pin Number Pin Name Type Note 2-1 20 X1 I 21 X2 O 22 DGND GND 23 VDD_D1.8 P 24 DGND GND 25 VDD_IO P 26 CSN Ipu 27 SO O SPI slave mode: Serial data out for SPI interface. This SO is tri-stated output when CSN is negated and this pin must have external 4.7 kΩ pull-up to keep the SO line high while the driver is tri-stated. 28 SCLK I SPI slave mode: Serial clock input for SPI interface. This clock speed can run up to 40 MHz. 29 DGND GND 30 VDD_IO P 31 SI Ipd SPI slave mode: Serial data in for SPI interface. 32 LED1 Opu Programmable LED1 output to indicate PHY activity/status (see LED0 description at pin 1). Note 2-1 TABLE 2-2: 25 MHz crystal or oscillator clock connection. Pins (X1, X2) connect to a crystal. If an oscillator is used, X1 connects to a 3.3V tolerant oscillator and X2 is a no connect. Note: Clock requirement is ±50 ppm for either crystal or oscillator. Digital IO ground 1.8V digital power supply from VDD_CO1.8 (pin 5) with appropriate filtering. If VDD_IO is 1.8V, this pin must be supplied power from the same source as pins 25 and 30 (VDD_IO) with appropriate filtering. Digital IO ground 3.3V, 2.5V, or 1.8V digital VDD input power supply for IO with well decoupling capacitors. SPI slave mode: Chip Select Not Active low input pin for SPI interface. Digital IO ground 3.3V, 2.5V, or 1.8V digital VDD input power supply for IO with well decoupling capacitors. P = power supply GND = ground I = input O = output I/O = bi-directional Ipu/O = Input with internal pull-up (58 kΩ ±30%) during power-up/reset; output pin otherwise. Ipd/O = Input with internal pull-down (58 kΩ ±30%) during power-up/reset; output pin otherwise. Ipu = Input with internal pull-up. (58 kΩ ±30%) Ipd = Input with internal pull-down. (58 kΩ ±30%) Opu = Output with internal pull-up. (58 kΩ ±30%) Opd = Output with internal pull-down. (58 kΩ ±30%) STRAP-IN OPTIONS Pin Number Pin Name Type 6 EED_IO Ipd/O Note 2-1 Description Description EEPROM select: Pull-up = EEPROM present Floating (NC) or Pull-down = EEPROM not present (default) During power-up / reset, this pin value is latched into register CCR, bit 9 Pin strap-ins are latched during power-up or reset. See details about Ipd/O above.  2017-2021 Microchip Technology Inc. DS00002381C-page 9 KSZ8851SNL/SNLI 3.0 FUNCTIONAL DESCRIPTION The KSZ8851SNL is a single-chip Fast Ethernet MAC/PHY controller consisting of a 10/100 physical layer transceiver (PHY), a MAC, and an industry standard Serial Peripheral Interface (SPI). The host CPU is via SPI interface to read/ write KSZ8851SNL internal registers either byte (8-bit), word (16-bit) or double word (32-bit) and to access KSZ8851SNL RXQ/TXQ FIFOs for packet receive/transmit. The KSZ8851SNL is fully compliant with IEEE802.3u standards. 3.1 Functional Overview: Power Management The KSZ8851SNL supports enhanced power management feature in low power state with energy detection to ensure low-power dissipation during device idle periods. There are three operation modes under the power management function which is controlled by two bits in PMECR (0xD4) register as shown below: • PMECR[1:0] = 00 Normal Operation Mode • PMECR[1:0] = 01 Energy Detect Mode • PMECR[1:0] = 11 Power Saving Mode Table 3-1 indicates all internal function blocks status under four different power management operation modes. TABLE 3-1: INTERNAL FUNCTION BLOCKS STATUS Power Management Operation Modes KSZ8851SNL Function Blocks Normal Mode Internal PLL Clock Enabled Disabled Enabled Tx/Rx PHY Enabled Energy Detect at Rx Rx Unused Block Disabled MAC Enabled Disabled Enabled SPI Enabled Disabled Enabled 3.1.1 Energy Detect Mode Power Saving Mode NORMAL OPERATION MODE This is the default setting bit[1:0]=00 in PMECR register after the chip power-up or hardware reset (pin 2). When KSZ8851SNL is in this normal operation mode, all PLL clocks are running, PHY and MAC are on and the host interface is ready for CPU read or write. During the normal operation mode, the host CPU can set the bit[1:0] in PMECR register to transit the current normal operation mode to any one of the other three power management operation modes. 3.1.2 ENERGY DETECT MODE The energy detect mode provides a mechanism to save more power than in the normal operation mode when the KSZ8851SNL is not connected to an active link partner. For example, if a cable is not present or it is connected to a powered down partner, the KSZ8851SNL can automatically enter to the low power state in energy detect mode. Once activity resumes due to plugging a cable in or from an attempt by the far end to establish link, the KSZ8851SNL can automatically power up to normal power state in energy detect mode. Energy detect mode consists of two states, normal power state and low power state. While in low power state, the KSZ8851SNL reduces power consumption by disabling all circuitry except the energy detect circuitry of the receiver. The energy detect mode is entered by setting bit[1:0]=01 in PMECR register. When the KSZ8851SNL is in this mode, it will monitor the cable energy. If there is no energy on the cable for a time longer than pre-configured value at bit[7:0] Go-Sleep time in GSWUTR register, KSZ8851SNL will go into a low power state. When KSZ8851SNL is in low power state, it will keep monitoring the cable energy. Once the energy is detected from the cable and is continuously presented for a time longer than pre-configured value at bit[15:8] Wake-Up time in GSWUTR register, the KSZ8851SNL will enter either the normal power state if the auto-wakeup enable bit[7] is set in PMECR register or the normal operation mode if both auto-wakeup enable bit[7] and wakeup to normal operation mode bit[6] are set in PMECR register. The KSZ8851SNL will also assert PME output pin if the corresponding enable bit[8] is set in PMECR (0xD4) register or generate interrupt to signal an energy detect event occurred if the corresponding enable bit[2] is set in IER (0x90) register. Once the power management unit detects the PME output asserted or interrupt active, it will power up the host CPU and issue a wakeup command which is any one of registers read or write access to wake up the KSZ8851SNL from the low power state to the normal power state in case the auto-wakeup enable bit[7] is disabled. When KSZ8851SNL is at normal power state, it is able to transmit or receive packet from the cable. DS00002381C-page 10  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 3.1.3 POWER SAVING MODE The power saving mode is entered when auto-negotiation mode is enabled, cable is disconnected, and by setting bit[1:0]=11 in PMECR register and bit [10]=1 in P1SCLMD register. When KSZ8851SNL is in this mode, all PLL clocks are enabled, MAC is on, all internal registers value will not change, and host interface is ready for CPU read or write. In this mode, it mainly controls the PHY transceiver on or off based on line status to achieve power saving. The PHY remains transmitting and only turns off the unused receiver block. Once activity resumes due to plugging a cable in or from an attempt by the far end to establish link, the KSZ8851SNL can automatically enabled the PHY power up to normal power state from power saving mode. During this power saving mode, the host CPU can program the bit[1:0] in PMECR register and set bit[10]=0 in P1SCLMD register to transit the current power saving mode to any one of the other three power management operation modes. 3.1.4 WAKE-ON-LAN Wake-up frame events are used to wake the system whenever meaningful data is presented to the system over the network. Examples of meaningful data include the reception of a Magic Packet, a management request from a remote administrator, or simply network traffic directly targeted to the local system. In all of these instances, the network device is pre-programmed by the policy owner or other software with information on how to identify wake frames from other network traffic. The KSZ8851SNL controller can be programmed to notify the host of the wake-up frame detection with the assertion of the interrupt signal (INTRN) or assertion of the power management event signal (PME). A wake-up event is a request for hardware and/or software external to the network device to put the system into a powered state (working). A wake-up signal is caused by: • • • • Detection of energy signal over a pre-configured value (bit 2 in ISR register) Detection of a linkup in the network link state (bit 3 in ISR register) Receipt of a network wake-up frame (bit 5 in ISR register) Receipt of a Magic Packet (bit 4 in ISR register) There are also other types of wake-up events that are not listed here as manufacturers may choose to implement these in their own ways. 3.1.4.1 Detection of Energy The energy is detected from the cable and is continuously presented for a time longer than pre-configured value, especially when this energy change may impact the level at which the system should re-enter to the normal power state. 3.1.4.2 Detection of Linkup Link status wake events are useful to indicate a linkup in the network’s connectivity status. 3.1.4.3 Wake-Up Packet Wake-up packets are certain types of packets with specific CRC values that a system recognizes as a ‘wake up’ frame. The KSZ8851SNL supports up to four user-defined wake-up frames as below: 1. 2. 3. 4. Wake-up frame 0 is defined control register (0x2A). Wake-up frame 1 is defined control register (0x2A). Wake-up frame 2 is defined control register (0x2A). Wake-up frame 3 is defined control register (0x2A). 3.1.4.4 in wakeup frame registers (0x30 – 0x3B) and is enabled by bit 0 in wakeup frame in wakeup frame registers (0x40 – 0x4B) and is enabled by bit 1 in wakeup frame in wakeup frame registers (0x50 – 0x5B) and is enabled by bit 2 in wakeup frame in wakeup frame registers (0x60 – 0x6B) and is enabled by bit 3 in wakeup frame Magic Packet Magic Packet technology is used to remotely wake up a sleeping or powered off PC on a LAN. This is accomplished by sending a specific packet of information, called a Magic Packet frame, to a node on the network. When a PC capable of receiving the specific frame goes to sleep, it enables the Magic Packet RX mode in the LAN controller, and when the LAN controller receives a Magic Packet frame, it will alert the system to wake up. Magic Packet is a standard feature integrated into the KSZ8851SNL. The controller implements multiple advanced power-down modes including Magic Packet to conserve power and operate more efficiently.  2017-2021 Microchip Technology Inc. DS00002381C-page 11 KSZ8851SNL/SNLI Once the KSZ8851SNL has been put into Magic Packet Enable mode (WFCR[7]=1), it scans all incoming frames addressed to the node for a specific data sequence, which indicates to the controller this is a Magic Packet (MP) frame. A Magic Packet frame must also meet the basic requirements for the LAN technology chosen, such as Source Address (SA), Destination Address (DA), which may be the receiving station’s IEEE address or a multicast or broadcast address and CRC. The specific sequence consists of 16 duplications of the IEEE address of this node, with no breaks or interruptions. This sequence can be located anywhere within the packet, but must be preceded by a synchronization stream. The synchronization stream allows the scanning state machine to be much simpler. The synchronization stream is defined as 6 bytes of FFh. The device will also accept a broadcast frame, as long as the 16 duplications of the IEEE address match the address of the machine to be awakened. Example: If the IEEE address for a particular node on a network is 11h 22h, 33h, 44h, 55h, 66h, the LAN controller would be scanning for the data sequence (assuming an Ethernet frame): DESTINATION SOURCE – MISC - FF FF FF FF FF FF - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 -11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - MISC - CRC. There are no further restrictions on a Magic Packet frame. For instance, the sequence could be in a TCP/IP packet or an IPX packet. The frame may be bridged or routed across the network without affecting its ability to wake-up a node at the frame’s destination. If the LAN controller scans a frame and does not find the specific sequence shown above, it discards the frame and takes no further action. If the KSZ8851SNL controller detects the data sequence, however, it then alerts the PC’s power management circuitry (assert the PME pin) to wake up the system. 3.2 3.2.1 Physical Layer Transceiver (PHY) 100BASE-TX TRANSMIT The 100BASE-TX transmit function performs parallel-to-serial conversion, 4B/5B coding, scrambling, NRZ-to-NRZI conversion, and MLT3 encoding and transmission. The circuitry starts with a parallel-to-serial conversion, which converts the MII data from the MAC into a 125 MHz serial bit stream. The data and control stream is then converted into 4B/5B coding, followed by a scrambler. The serialized data is further converted from NRZ-to-NRZI format, and then transmitted in MLT3 current output. An external 3.01 kΩ (1%) resistor is connected to pin 17 (ISET) for the 1:1 transformer ratio sets the output current. The output signal has a typical rise/fall time of 4 ns and complies with the ANSI TP-PMD standard regarding amplitude balance, overshoot, and timing jitter. The wave-shaped 10BASE-T output driver is also incorporated into the 100BASETX driver. 3.2.2 100BASE-TX RECEIVE The 100BASE-TX receiver function performs adaptive equalization, DC restoration, MLT3-to-NRZI conversion, data and clock recovery, NRZI-to-NRZ conversion, de-scrambling, 4B/5B decoding, and serial-to-parallel conversion. The receiving side starts with the equalization filter to compensate for inter-symbol interference (ISI) over the twisted pair cable. Since the amplitude loss and phase distortion is a function of the cable length, the equalizer has to adjust its characteristics to optimize performance. In this design, the variable equalizer makes an initial estimation based on comparisons of incoming signal strength against some known cable characteristics, and then tunes itself for optimization. This is an ongoing process and self-adjusts against environmental changes such as temperature variations. Next, the equalized signal goes through a DC restoration and data conversion block. The DC restoration circuit is used to compensate for the effect of baseline wander and to improve the dynamic range. The differential data conversion circuit converts the MLT3 format back to NRZI. The slicing threshold is also adaptive. The clock recovery circuit extracts the 125 MHz clock from the edges of the NRZI signal. This recovered clock is then used to convert the NRZI signal into the NRZ format. This signal is sent through the de-scrambler followed by the 4B/ 5B decoder. Finally, the NRZ serial data is converted to an MII format and provided as the input data to the MAC. DS00002381C-page 12  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 3.2.3 PLL CLOCK SYNTHESIZER (RECOVERY) The internal PLL clock synthesizer can generate either 125 MHz, 62.5 MHz, 41.66 MHz, or 25 MHz clocks by setting the on-chip bus control register (0x20) for KSZ8851SNL system timing. These internal clocks are generated from an external 25 MHz crystal or oscillator. 3.2.4 SCRAMBLER/DE-SCRAMBLER (100BASE-TX ONLY) The purpose of the scrambler is to spread the power spectrum of the signal to reduce electromagnetic interference (EMI) and baseline wander. Transmitted data is scrambled through the use of an 11-bit wide linear feedback shift register (LFSR). The scrambler generates a 2047-bit non-repetitive sequence. Then the receiver de-scrambles the incoming data stream using the same sequence as at the transmitter. 3.2.5 10BASE-T TRANSMIT The 10BASE-T driver is incorporated with the 100BASE-TX driver to allow for transmission using the same magnetics. They are internally wave-shaped and pre-emphasized into outputs with a typical 2.3V amplitude. The harmonic contents are at least 27 dB below the fundamental frequency when driven by an all-ones Manchester-encoded signal. 3.2.6 10BASE-T RECEIVE On the receive side, input buffers and level detecting squelch circuits are employed. A differential input receiver circuit and a phase-locked loop (PLL) perform the decoding function. The Manchester-encoded data stream is separated into clock signal and NRZ data. A squelch circuit rejects signals with levels less than 400 mV or with short pulse widths to prevent noise at the RXP-or-RXM input from falsely triggering the decoder. When the input exceeds the squelch limit, the PLL locks onto the incoming signal and the KSZ8851SNL decodes a data frame. The receiver clock is maintained active during idle periods in between data reception. 3.2.7 MDI/MDI-X AUTO CROSSOVER To eliminate the need for crossover cables between similar devices, the KSZ8851SNL supports HP Auto MDI/MDI-X and IEEE 802.3u standard MDI/MDI-X auto crossover. HP Auto MDI/MDI-X is the default. The auto-sense function detects remote transmit and receive pairs and correctly assigns transmit and receive pairs for the KSZ8851SNL device. This feature is extremely useful when end users are unaware of cable types and also saves on an additional uplink configuration connection. The auto-crossover feature can be disabled through the port control registers or MIIM PHY registers. The IEEE 802.3u standard MDI and MDI-X definitions are illustrated in Table 3-2. TABLE 3-2: MDI/MDI-X PIN DEFINITIONS MDI 3.2.7.1 MDI-X RJ-45 Pins Signals RJ-45 Pins Signals 1 2 TD+ 1 RD+ TD– 2 RD– 3 6 RD+ 3 TD+ RD– 6 TD– Straight Cable A straight cable connects an MDI device to an MDI-X device, or an MDI-X device to an MDI device. Figure 3-1 depicts a typical straight cable connection between a network interface card (NIC) and a switch, or hub (MDI-X).  2017-2021 Microchip Technology Inc. DS00002381C-page 13 KSZ8851SNL/SNLI FIGURE 3-1: TYPICAL STRAIGHT CABLE CONNECTION 10/100 Ethernet Media Dependent Interface 10/100 Ethernet Media Dependent Interface 1 1 2 2 Transmit Pair Receive Pair 3 Straight Cable 3 4 4 5 5 6 6 7 7 8 8 Receive Pair Modular Connector (RJ-45) NIC DS00002381C-page 14 Transmit Pair Modular Connector (RJ-45) HUB (Repeater or Switch)  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 3.2.7.2 Crossover Cable A crossover cable connects an MDI device to another MDI device, or an MDI-X device to another MDI-X device. Figure 3-2 shows a typical crossover cable connection between two switches or hubs (two MDI-X devices). FIGURE 3-2: TYPICAL CROSSOVER CABLE CONNECTION 10/100 Ethernet Media Dependent Interface 1 Receive Pair 10/100 Ethernet Media Dependent Interface Crossover Cable 1 Receive Pair 2 2 3 3 4 4 5 5 6 6 7 7 8 8 Transmit Pair Transmit Pair Modular Connector (RJ-45) HUB (Repeater or Switch) 3.2.8 Modular Connector (RJ-45) HUB (Repeater or Switch) AUTO-NEGOTIATION The KSZ8851SNL conforms to the auto negotiation protocol as described by the 802.3 committee to allow the port to operate at either 10BASE-T or 100BASE-TX. Auto negotiation allows unshielded twisted pair (UTP) link partners to select the best common mode of operation. In auto negotiation, the link partners advertise capabilities across the link to each other. If auto negotiation is not supported or the link partner to the KSZ8851SNL is forced to bypass auto negotiation, the mode is set by observing the signal at the receiver. This is known as parallel mode because while the transmitter is sending auto negotiation advertisements, the receiver is listening for advertisements or a fixed signal protocol. The link up process is shown in Figure 3-3.  2017-2021 Microchip Technology Inc. DS00002381C-page 15 KSZ8851SNL/SNLI FIGURE 3-3: AUTO-NEGOTIATION AND PARALLEL OPERATION START AUTO-NEGOTIATION FORCE LINK SETTING NO PARALLEL OPERATION YES BYPASS AUTO-NEGOTIATION AND SET LINK MODE ATTEMPT AUTONEGOTIATION LISTEN FOR 100BASE-TX IDLES LISTEN FOR 10BASE-T LINK PULSES NO JOIN FLOW LINK MODE SET? YES LINK MODE SET 3.2.9 LINKMD® CABLE DIAGNOSTICS The KSZ8851SNL supports LinkMD. The LinkMD feature utilizes time domain reflectometry (TDR) to analyze the cabling plant for common cabling problems such as open circuits, short circuits, and impedance mismatches. LinkMD works by sending a pulse of known amplitude and duration down the MDI and MDI-X pairs and then analyzes the shape of the reflected signal. Timing the pulse duration gives an indication of the distance to the cabling fault with a maximum distance of 200m and an accuracy of ±2m. Internal circuitry displays the TDR information in a user-readable digital format in register P1SCLMD[8:0]. Cable diagnostics are only valid for copper connections and do not support fiber optic operation. 3.2.9.1 Access LinkMD is initiated by accessing register P1SCLMD, the PHY special control/status and LinkMD register (0xF4). 3.2.9.2 Usage LinkMD can be run at any time by ensuring that Auto-MDIX has been disabled. To disable Auto-MDIX, write a ‘1’ to P1CR[10] to enable manual control over the pair used to transmit the LinkMD pulse. The self-clearing cable diagnostic test enable bit, P1SCLMD [12], is set to ‘1’ to start the test on this pair. When bit P1SCLMD[12] returns to ‘0’, the test is complete. The test result is returned in bits P1SCLMD[14:13] and the distance is returned in bits P1SCLMD[8:0]. The cable diagnostic test results are as follows: DS00002381C-page 16  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 00 = Valid test, normal condition 01 = Valid test, open circuit in cable 10 = Valid test, short circuit in cable 11 = Invalid test, LinkMD failed If P1SCLMD[14:13]=11, this indicates an invalid test, and occurs when the KSZ8851SNL is unable to shut down the link partner. In this instance, the test is not run, as it is not possible for the KSZ8851SNL to determine if the detected signal is a reflection of the signal generated or a signal from another source. Cable distance can be approximated by the following formula: P1SCLMD[8:0] x 0.4m for port 1 cable distance This constant may be calibrated for different cabling conditions, including cables with a velocity of propagation that varies significantly from the norm. 3.3 Media Access Control (MAC) Operation The KSZ8851SNL strictly abides by IEEE 802.3 standards to maximize compatibility. 3.3.1 INTER PACKET GAP (IPG) If a frame is successfully transmitted, then the minimum 96-bit time for IPG is measured between two consecutive packets. If the current packet is experiencing collisions, the minimum 96-bit time for IPG is measured from carrier sense (CRS) to the next transmit packet. 3.3.2 BACK-OFF ALGORITHM The KSZ8851SNL implements the IEEE standard 802.3 binary exponential back-off algorithm in half-duplex mode. After 16 collisions, the packet is dropped. 3.3.3 LATE COLLISION If a transmit packet experiences collisions after 512 bit times of the transmission, the packet is dropped. 3.3.4 FLOW CONTROL The KSZ8851SNL supports standard 802.3x flow control frames on both transmit and receive sides. On the receive side, if the KSZ8851SNL receives a pause control frame, the KSZ8851SNL will not transmit the next normal frame until the timer, specified in the pause control frame, expires. If another pause frame is received before the current timer expires, the timer will be updated with the new value in the second pause frame. During this period (while it is flow controlled), only flow control packets from the KSZ8851SNL are transmitted. On the transmit side, the KSZ8851SNL has intelligent and efficient ways to determine when to invoke flow control. The flow control is based on availability of the system resources. There are three programmable low watermark register FCLWR (0xB0), high watermark register FCHWR (0xB2) and overrun watermark register FCOWR (0xB4) for flow control in RXQ FIFO. The KSZ8851SNL will send PAUSE frame when the RXQ buffer hit the high watermark level (default 3.072 KByte available) and stop PAUSE frame when the RXQ buffer hit the low watermark level (default 5.12 KByte available). The KSZ8851SNL will drop packet when the RXQ buffer hit the overrun watermark level (default 256-Byte available). The KSZ8851SNL issues a flow control frame (XOFF, or transmitter off), containing the maximum pause time defined in IEEE standard 802.3x. Once the resource is freed up, the KSZ8851SNL sends out the another flow control frame (XON, or transmitter on) with zero pause time to turn off the flow control (turn on transmission to the port). A hysteresis feature is provided to prevent the flow control mechanism from being constantly activated and deactivated. 3.3.5 HALF-DUPLEX BACKPRESSURE A half-duplex backpressure option (non-IEEE 802.3 standards) is also provided. The activation and deactivation conditions are the same as in full-duplex mode. If backpressure is required, the KSZ8851SNL sends preambles to defer the other stations' transmission (carrier sense deference). To avoid jabber and excessive deference (as defined in the 802.3 standard), after a certain time, the KSZ8851SNL discontinues the carrier sense and then raises it again quickly. This short silent time (no carrier sense) prevents other stations from sending out packets thus keeping other stations in a carrier sense deferred state. If the port has packets to send during a backpressure situation, the carrier sense type backpressure is interrupted and those packets are trans-  2017-2021 Microchip Technology Inc. DS00002381C-page 17 KSZ8851SNL/SNLI mitted instead. If there are no additional packets to send, carrier sense type backpressure is reactivated again until chip resources free up. If a collision occurs, the binary exponential back-off algorithm is skipped and carrier sense is generated immediately, thus reducing the chance of further collision and carrier sense is maintained to prevent packet reception. 3.3.6 ADDRESS FILTERING FUNCTION The KSZ8851SNL supports 11 different address filtering schemes as shown in the following Table 3-3. The Ethernet destination address (DA) field inside the packet is the first 6-byte field which uses to compare with either the host MAC address registers (0x10 – 0x15) or the MAC address hash table registers (0xA0 – 0xA7) for address filtering operation. The first bit (bit 40) of the destination address (DA) in the Ethernet packet decides whether this is a physical address if bit 40 is “0” or a multicast address if bit 40 is “1”. TABLE 3-3: ADDRESS FILTERING Receive Control Register (0x74 – 0x75): RXCR1 Item Address Filtering Mode 1 RX All (Bit 4) RX Inverse (Bit 1) RX Physical Address (Bit 11) RX Multicast Address (Bit 8) Perfect 0 0 1 1 All Rx frames are passed only if the DA exactly matches the MAC address in MARL, MARM, and MARH registers. 2 Inverse perfect 0 1 1 1 All Rx frames are passed if the DA is not matching the MAC address in MARL, MARM, and MARH registers. 3 Hash only 0 0 0 0 All Rx frames with either multicast or physical destination address are filtering against the MAC address hash table. 0 All Rx frames with either multicast or physical destination address are filtering not against the MAC address hash table. All Rx frames which are filtering out at item 3 (Hash only) only are passed in this mode. 4 Inverse hash only 0 1 0 Description 5 Hash perfect (default) 0 0 1 0 All Rx frames are passed with Physical address (DA) matching the MAC address and to enable receive multicast frames that pass the hash table when Multicast address is matching the MAC address hash table. 6 Inverse hash perfect 0 1 1 0 All Rx frames which are filtering out at item 5 (Hash perfect) only are passed in this mode. 7 Promiscuous 1 1 0 0 All Rx frames are passed without any conditions. 8 Hash only with multicast address passed 0 All Rx frames are passed with Physical address (DA) matching the MAC address hash table and with Multicast address without any conditions. 9 Perfect with multicast address passed 1 All Rx frames are passed with Physical address (DA) matching the MAC address and with Multicast address without any conditions. DS00002381C-page 18 1 1 0 0 0 1  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 3-3: ADDRESS FILTERING (CONTINUED) Receive Control Register (0x74 – 0x75): RXCR1 Item Address Filtering Mode 10 Hash only with physical address passed 11 Perfect with physical address passed RX All (Bit 4) 1 1 RX Physical Address (Bit 11) RX Inverse (Bit 1) 0 RX Multicast Address (Bit 8) 1 0 0 Description 0 All Rx frames are passed with Multicast address matching the MAC address hash table and with Physical address without any conditions. 1 All Rx frames are passed with Multicast address matching the MAC address and with Physical address without any conditions. Note 3-1 Bit 0 (RX Enable), Bit 5 (RX Unicast Enable) and Bit 6 (RX Multicast Enable) must be set to 1 in the RXCR1 register. Note 3-2 The KSZ8851SNL will discard a frame with an SA that is the same as the MAC address if bit[0] is set in RXCR2 register. 3.3.7 CLOCK GENERATOR The X1 and X2 pins are connected to a 25 MHz crystal. X1 can also serve as the connector to a 3.3V, 25 MHz oscillator (as described in the pin description). 3.4 Serial Peripheral Interface (SPI) The KSZ8851SNL supports an SPI in slave mode. In this mode, an external SPI master device (microcontroller or CPU) supplies the operating serial clock (SCLK), chip select (CSN), and serial input data (SI) which is clocked in on the rising edge of SCLK to KSZ8851SNL device. Serial output data (SO) is driven out by the KSZ8851SNL on the falling edge of SCLK to external SPI master device. The falling edge of CSN is starting the SPI operation and the rising edge of CSN is ending the SPI operation. The SCLK stays low state when SPI operation is idle. Figure 3-4 shows the SPI connection for KSZ8851SNL. FIGURE 3-4: SPI INTERFACE TO KSZ8851SNL Host CPU SCLK /SS KSZ8851SNL SCLK CSN MOSI SI MISO SO IRQ INTRN There are four SPI operations depending on the opcode inside the command phase: • Internal I/O registers read (opcode = 00) • Internal I/O registers write (opcode = 01) • RXQ FIFO read to receive packet (opcode = 10)  2017-2021 Microchip Technology Inc. DS00002381C-page 19 KSZ8851SNL/SNLI • TXQ FIFO write to transmit packet (opcode = 11) As shown in Table 3-4 and Table 3-5, there are two phases in each SPI operation, the first is command phase and the following is data phase. Command phase is two bytes long for internal I/O registers access and one byte long for TXQ/ RXQ FIFOs access. Data phase on internal I/O registers access is in the range of one to four bytes long depending on the specified byte enable bits B[3:0] in command phase, and data phase on TXQ or RXQ FIFOs access is limited up to 6 Kbytes for TXQ access or 12 Kbytes for RXQ access. TABLE 3-4: SPI OPERATION FOR REGISTERS ACCESS Command Phase (SI Pin) Byte 0 [7:0] SPI Operation Opcode Internal I/O Register Read Internal I/O Register Write Note 3-1 TABLE 3-5: Byte 1 [7:0] Byte Enable 0 0 Don’t Care Bits Register Address B3 B2 B1 B0 A7 A6 A5 A4 A3 A2 X X X X Data Phase (SO or SI Pins) 1 to 4 Bytes (read data on SO pin) 1 to 4 Bytes (write data on SI pin) In Command phase, A[7:2] access register address location in double word and B[3:0] enable which byte to access during read or write. In Data phase, the byte 0 is first in/out and byte 3 is last in/out during read or write. B[3:0] = 1: enable byte, = 0: disable byte. 0 1 B3 B2 B1 B0 A7 A6 A5 A4 A3 A2 X X X X SPI OPERATION FOR TXQ/RXQ FIFO ACCESS Command Phase (SI Pin) SPI Operation Opcode RXQ FIFO Read (12 KByte) Data Phase (SO or SI Pins) Byte 0 [7:0] 1 0 Don’t Care Bits X X X X X X 1 to 12 KBytes (DMA read data on SO pin) TXQ FIFO Write 1 to 6 KBytes 1 1 X X X X X X (6 KByte) (DMA write data on SI pin) Note 3-1 The Start DMA Access bit 3 in RXQCR register must set to “1” before FIFO read/write commands. This bit must be clear to “0” when DMA operation is finished. 3.4.1 SPI INTERNAL I/O REGISTERS ACCESS OPERATION TIMING As shown in Figure 3-5 and Figure 3-6, the SPI internal I/O registers read and write operation timing, the first two command byte 0/1 contain opcode (00: read command, 01: write command), B[3:0] Byte enable bits to indicate which data byte is available in data phase (1: byte enable, 0: byte disable) and A[7:2] address bits to access register location. The following is data phase either 1, 2, 3, or 4 bytes depending on B[3:0] setting. DS00002381C-page 20  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI FIGURE 3-5: INTERNAL I/O REGISTER READ TIMING CSN SCLK SI 0 0 B3 B2 B1 B0 A7 A6 A5 A4 A3 A2 X X X High Impedance SO Read Command Byte 0 FIGURE 3-6: X X X X X X X X X D7 D6 D5 D4 D3 D2 D1 D0 Read Command Byte 1 Read Data (1 to 4 bytes based on B[3:0]) INTERNAL I/O REGISTER WRITE TIMING CSN SCLK SI 0 1 X D7 D6 D5 D4 D3 D2 D1 D0 Write Command Byte 1 Write Data (1 to 4 bytes based on B[3:0]) X X High Impedance SO Write Command Byte 0 3.4.2 X B3 B2 B1 B0 A7 A6 A5 A4 A3 A2 SPI TXQ/RXQ FIFOS ACCESS OPERATION TIMING Figure 3-7 and Figure 3-8 illustrate the SPI TXQ/RXQ FIFOs write and read operation timing, the first command byte 0 contains only opcode (10: read command, 11: write command) and the following is read/write data phase.  2017-2021 Microchip Technology Inc. DS00002381C-page 21 KSZ8851SNL/SNLI FIGURE 3-7: RXQ FIFO READ TIMING CSN SCLK 0 1 SI X X X X X X High Impedance SO X X X X X X X X X X X X X X X X D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 Read Data Byte 1 RXQ Read Command Byte 0 Read Data Byte 2 CSN SCLK SI X X X X X X X X X X X X X X X X X X X X X X X X SO D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 Read Data Byte 4 Read Data Byte 3 FIGURE 3-8: Read Data Byte N TXQ FIFO WRITE TIMING CSN SCLK SI 1 X 1 X X X X X D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D1 D0 High Impedance SO Write Data Byte 1 TXQ Write Command Byte 0 Write Data Byte 2 CSN SCLK SI D7 D6 D5 D4 D3 D2 D1 D0 D7 D5 D6 SO Write Data Byte 3 3.5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 High Impedance Write Data Byte 4 Write Data Byte N Queue Management Unit (QMU) The Queue Management Unit (QMU) manages packet traffic between the MAC/PHY interface and the system host. It has built-in packet memory for receive and transmit functions called TXQ (Transmit Queue) and RXQ (Receive Queue). Each queue contains 12 KB for RXQ and 6 KB for TXQ of memory with back-to-back, non-blocking frame transfer performance. It provides a group of control registers for system control, frame status registers for current packet transmit/ receive status, and interrupts to inform the host of the real time TX/RX status. DS00002381C-page 22  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 3.5.1 TRANSMIT QUEUE (TXQ) FRAME FORMAT The frame format for the transmit queue is shown in the following Table 3-6. The first word contains the control information for the frame to transmit. The second word is used to specify the total number of bytes of the frame. The packet data follows. The packet data area holds the frame itself. It may or may not include the CRC checksum depending upon whether hardware CRC checksum generation is enabled in TXCR (bit 1) register. Multiple frames can be pipelined in both the transmit queue and receive queue as long as there is enough queue memory, thus avoiding overrun. For each transmitted frame, the transmit status information for the frame is located in the TXSR (0x72) register. TABLE 3-6: FRAME FORMAT FOR TRANSMIT QUEUE Bit 15 2nd Byte Packet Memory Address Offset 0 Bit 0 1st Byte Control Word 2 Byte Count 4 and Up Transmit Packet Data (maximum size is 2000) Because multiple packets can be pipelined into the TX packet memory for transmit, the transmit status reflects the status of the packet that is currently being transferred on the MAC interface, which may or may not be the last queued packet in the TX queue. The transmit control word is the first 16-bit word in the TX packet memory, followed by a 16-bit byte count. It must be word aligned. Each control word corresponds to one TX packet. Table 3-7 gives the transmit control word bit fields. TABLE 3-7: TRANSMIT CONTROL WORD BIT FIELDS Bit Description 15 TXIC Transmit Interrupt on Completion When this bit is set, the KSZ8851SNL sets the transmit interrupt after the present frame has been transmitted. 14-6 Reserved TXFID Transmit Frame ID This field specifies the frame ID that is used to identify the frame and its associated status information in the transmit status register. The transmit Byte Count specifies the total number of bytes to be transmitted from the TXQ. Its format is given in Table 38. 5-0 TABLE 3-8: Bit TRANSMIT BYTE COUNT FORMAT Description 15-11 Reserved 10-0 TXBC Transmit Byte Count Transmit Byte Count. Hardware uses the byte count information to conserve the TX buffer memory for better utilization of the packet memory. Note: The hardware behavior is unknown if an incorrect byte count information is written to this field. Writing a 0 value to this field is not permitted. The data area contains six bytes of Destination Address (DA) followed by six bytes of Source Address (SA), followed by a variable-length number of bytes. On transmit, all bytes are provided by the CPU, including the source address. The KSZ8851SNL does not insert its own SA. The 802.3 Frame Length word (Frame Type in Ethernet) is not interpreted by the KSZ8851SNL. It is treated transparently as data both for transmit operations. 3.5.2 FRAME TRANSMITTING PATH OPERATION IN TXQ This section describes the typical register settings for transmitting packets from host processor to KSZ8851SNL with generic bus interface. Users can use the default value for most of the transmit registers. The following Table 3-9 describes all registers which need to be set and used for transmitting single or multiple frames.  2017-2021 Microchip Technology Inc. DS00002381C-page 23 KSZ8851SNL/SNLI TABLE 3-9: REGISTERS SETTING FOR TRANSMIT FUNCTION BLOCK Register Name [bit](offset) TXCR[3:0](0x70) TXCR[8:5](0x70) TXMIR[12:0](0x78) Description Set transmit control function as below: Set bit 3 to enable transmitting flow control. Set bit 2 to enable transmitting padding. Set bit 1 to enable transmitting CRC. Set bit 0 to enable transmitting block operation. Set transmit checksum generation for ICMP, UDP, TCP, and IP packet. The amount of free transmit memory available is represented in units of byte. The TXQ memory (6 KByte) is used for both frame payload and control word. TXQCR[0](0x80) For single frame to transmit, set this bit 0 = 1(manual enqueue). the KSZ8851SNL will enable current TX frame prepared in the TX buffer is queued for transmit, this is only transmit one frame at a time. Note: This bit is self-clearing after the frame is finished transmitting. The software should wait for the bit to be cleared before setting up another new TX frame. TXQCR[1](0x80) When this bit is written as 1, the KSZ8851SNL will generate interrupt (bit 6 in ISR register) to CPU when TXQ memory is available based upon the total amount of TXQ space requested by CPU at TXNTFSR (0x9E) register. Note: This bit is self-clearing after the frame is finished transmitting. The software should wait for the bit to be cleared before set to 1 again TXQCR[2](0x80) For multiple frames to transmit, set this bit 2 = 1 (auto-enqueue). the KSZ8851SNL will enable current all TX frames prepared in the TX buffer are queued to transmit automatically. RXQCR[3](0x82) Set bit 3 to start DMA access from host CPU either read (receive frame data) or write (transmit data frame) TXFDPR[14](0x84) Set bit 14 to enable TXQ transmit frame data pointer register increments automatically on accesses to the data register. IER[14][6](0x90) Set bit 14 to enable transmit interrupt in Interrupt Enable Register Set bit 6 to enable transmit space available interrupt in Interrupt Enable Register. ISR[15:0](0x92) Write 1 (0xFFFF) to clear all interrupt status bits after interrupt occurred in Interrupt Status Register. TXNTFSR[15:0](0x9E) The host CPU is used to program the total amount of TXQ buffer space which is required for next total transmit frames size in double-word count. 3.5.3 DRIVER ROUTINE FOR TRANSMIT PACKET FROM HOST PROCESSOR TO KSZ8851SNL The transmit routine is called by the upper layer to transmit a contiguous block of data through the Ethernet controller. It is user’s choice to decide how the transmit routine is implemented. If the Ethernet controller encounters an error while transmitting the frame, it’s the user’s choice to decide whether the driver should attempt to retransmit the same frame or discard the data. The following figures show the step-by-step for single and multiple transmit packets from host processor to KSZ8851SNL. DS00002381C-page 24  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI FIGURE 3-9: HOST TX SINGLE FRAME IN MANUAL ENQUEUE FLOW DIAGRAM Host receives an Ethernet pkt from upper layer and prepares transmit pkt data (data, data_length, frame ID). The transmit queue frame format is shown in Table 3-6. Check if KSZ8851SNL TXQ Memory size is available for this transmit pkt? (Read TXMIR Reg) No Write the total amount of TXQ buffer space which is required for next transmit frame size in double-word count in TXNTFSR[15:0] register Set bit 1=1 in TXQCR register to enable the TXQ memory available monitor Yes Write an “1” to RXQCR[3] reg to enable TXQ write access, then Host issues a SPI opcode=11 to start write transmit data (control word, byte count and pkt data) to TXQ memory. This is moving transmit data from Host to KSZ8851SNL TXQ memory until whole pkt is finished Yes Wait for interrupt and check if the bit 6=1 (memory space available) in ISR register No Write an “0” to RXQCR[3] reg to end TXQ write access Write an “1” to TXQCR[0] reg to issue a transmit command (manual-enqueue) to the TXQ. The TXQ will transmit this pkt data to the PHY port Option to Read ISR[14] reg, it indicates that the TXQ has completed to transmit at least one pkt to the PHY port, then Write “1” to clear this bit  2017-2021 Microchip Technology Inc. DS00002381C-page 25 KSZ8851SNL/SNLI FIGURE 3-10: HOST TX MULTIPLE FRAMES IN AUTO ENQUEUE FLOW DIAGRAM Host receives multiple Ethernet pkts from upper layer and prepares transmit pkts data (data, data_length, frame ID). Each transmit queue frame format is shown in Table 3-6. Write an “1” to TXQCR[2] reg to issue a transmit command (autoenqueue) to the TXQ. The TXQ will transmit all data to the PHY port Check if KSZ8851SNL TXQ Memory size is available for these transmit pkts? (Read TXMIR Reg) No Write the total amount of TXQ buffer space which is required for next transmit total frames size in doubleword count in TXNTFSR[15:0] register Set bit 1=1 in TXQCR register to enable the TXQ memory available monitor Yes Write an “1” to RXQCR[3] reg to enable TXQ write access, then Host issues a SPI opcode=11 to start write transmit data (control word, byte count and pkt data) to TXQ memory. This is moving transmit data from Host to KSZ8851SNL TXQ memory until all pkts are finished Yes Wait for interrupt and check if the bit 6=1 (memory space available) in ISR register No Write an “0” to RXQCR[3] reg to end TXQ write access Option to read ISR[14] reg, it indicates that the TXQ has completed to transmit all pkts to the PHY port, then Write “1” to clear this bit DS00002381C-page 26  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 3.5.4 RECEIVE QUEUE (RXQ) FRAME FORMAT The frame format for the receive queue is shown in Table 3-10. The first word contains the status information for the frame received. The second word is the total number of bytes of the RX frame. Following that is the packet data area. The packet data area holds the frame itself. It includes the CRC checksum. TABLE 3-10: FRAME FORMAT FOR RECEIVE QUEUE Packet Memory Address Offset 3.5.5 Bit 15 2nd Byte Bit 0 1st Byte 0 Status Word (see description in RXFHSR register) 2 Byte Count (see description in RXFHBCR register) 4 and up Receive Packet Data (maximum size is 2000) FRAME RECEIVING PATH OPERATION IN RXQ This section describes the typical register settings for receiving packets from KSZ8851SNL to host processor with generic bus interface. User can use the default value for most of the receive registers. The following Table 11 describes all registers which need to be set and used for receiving single or multiple frames. TABLE 3-11: REGISTERS SETTING FOR RECEIVE FUNCTION BLOCK Register Name [bit](offset) Description RXCR1(0x74) RXCR2(0x76) Set receive control function as below: Set RXCR1[10] to enable receiving flow control. Set RXCR1[0] to enable receiving block operation. Set receive checksum check for ICMP, UDP, TCP, and IP packet. Set receive address filtering scheme. RXFHSR[15:0](0x7C) This register (read only) indicates the current received frame header status information. RXFHBCR[11:0](0x7E) This register (read only) indicates the current received frame header byte count information. RXQCR[12:3](0x82) Set RXQ control function as below: Set bit 3 to start DMA access from host CPU either read (receive frame data) or write (transmit data frame). Set bit 4 to automatically enable RXQ frame buffer dequeue. Set bit 5 to enable RX frame count threshold and read bit 10 for status. Set bit 6 to enable RX data byte count threshold and read bit 11 for status. Set bit 7 to enable RX frame duration timer threshold and read bit 12 for status. Set bit 9 enable RX IP header two-byte offset. RXFDPR[14](0x86) Set bit 14 to enable RXQ address register increments automatically on accesses to the data register. RXDTTR[15:0](0x8C) To program received frame duration timer value. When Rx frame duration in RXQ exceeds this threshold in 1 µs interval count and bit 7 of RXQCR register is set to 1, the KSZ8851SNL will generate RX interrupt in ISR[13] and indicate the status in RXQCR[12]. RXDBCTR[15:0](0x8E) To program received data byte count value. When the number of received bytes in RXQ exceeds this threshold in byte count and bit 6 of RXQCR register is set to 1, the KSZ8851SNL will generate RX interrupt in ISR[13] and indicate the status in RXQCR[11]. IER[13](0x90) Set bit 13 to enable receive interrupt in Interrupt Enable Register. ISR[15:0](0x92) Write 1 (0xFFFF) to clear all interrupt status bits after interrupt occurred in Interrupt Status Register. RXFCTR[15:8](0x9C) Rx frame count read only. To indicate the total received frame in RXQ frame buffer when receive interrupt (bit 13 in ISR) occurred. RXFCTR[7:0](0x9C) To program received frame count value. When the number of received frames in RXQ exceeds this threshold value and bit 5 of RXQCR register is set to 1, the KSZ8851SNL will generate RX interrupt in ISR[13] and indicate the status in RXQCR[10].  2017-2021 Microchip Technology Inc. DS00002381C-page 27 KSZ8851SNL/SNLI 3.5.6 DRIVER ROUTINE FOR RECEIVE PACKET FROM KSZ8851SNL TO HOST PROCESSOR The software driver receives data packet frames from the KSZ8851SNL device either as a result of polling or an interrupt based service. When an interrupt is received, the OS invokes the interrupt service routine that is in the interrupt vector table. If your system has OS support, to minimize interrupt lockout time, the interrupt service routine should handle at interrupt level only those tasks that require minimum execution time, such as error checking or device status change. The routine should queue all the time-consuming work to transfer the packet from the KSZ8851SNL RXQ into system memory at task level. The following Figure 3-11 shows the step-by-step for receive packets from KSZ8851SNL to host processor. Each DMA read operation from the host CPU to read RXQ frame buffer, the first read data (byte in 8-bit bus mode, word in 16-bit bus mode and double word in 32-bit bus mode) is dummy data and must be discarded by host CPU. Afterward, host CPU must read each frame data to align with double word boundary at end. For example, the host CPU has to read up to 68 bytes if received frame size is 65 bytes. In order to read received frames from RXQ without error, the software driver must use following steps: 1. 2. 3. When receive interrupt occurred and software driver writes “1” to clear the RX interrupt in ISR register; the KSZ8851 will update Receive Frame Counter (RXFCTR) Register for this interrupt. When software driver reads back Receive Frame Count (RXFCTR) Register; the KSZ8851 will update both Receive Frame Header Status and Byte Count Registers (RXFHSR/RXFHBCR). When software driver reads back both Receive Frame Header Status and Byte Count Registers (RXFHSR/RXFHBCR); the KSZ8851 will update next receive frame header status and byte count registers (RXFHSR/RXFHBCR). DS00002381C-page 28  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI FIGURE 3-11: HOST RX SINGLE OR MULTIPLE FRAMES IN AUTO-DEQUEUE FLOW DIAGRAM To program Rx frame count threshold in RXFCTR, Rx data byte count threshold in RXDBCTR or Rx frame duration timer threshold in RXDTTR. Enable all thresholds bits in RXQCR[5:7]. Set bit 4 in RXQCR to enable RXQ frame buffer auto-dequeue Enable Rx interrupt in IER[13] Is Rx interrupt status bit set in ISR[13] when interrupt asserted? No Yes Rx interrupt source can be read from bits in RXQCR[10:12]. Mask out further Rx interrupt by set bit 13 to 0 in IER and clear Rx interrupt status by write 1 to bit 13 in ISR. Read total Rx frame count in RXFCTR and read Rx frame header status in RXFHSR and byte count in RXFHBCR. Write 0x000 to RXFDPR[10:0] to clear RX frame pointer Write an “1” to RXQCR[3] reg to enable RXQ read access, the Host CPU issues a SPI opcode=10 to start read frame data from RXQ buffer. Are all Rx frames read? No Yes Write an “0” to RXQCR[3] reg to end RXQ read access  2017-2021 Microchip Technology Inc. DS00002381C-page 29 KSZ8851SNL/SNLI 3.6 EEPROM Interface It is optional in the KSZ8851SNL to use an external EEPROM. The EED_IO (pin 6) must be pulled high to use external EEPROM otherwise this pin pulled low or floating without EEPROM. An external serial EEPROM with a standard microwire bus interface is used for non-volatile storage of information such as the host MAC address. The KSZ8851SNL can use 1 kb (93C46) EEPROM devices. The EEPROM must be organized as 16-bit mode. If the EED_IO pin is pulled high, then the KSZ8851SNL performs an automatic read of the external EEPROM words 0H to 3H after the de-assertion of Reset. The EEPROM values are placed in certain host-accessible registers. EEPROM read/write functions can also be performed by software read/writes to the EEPCR (0x22) registers. The KSZ8851SNL EEPROM format is given in Table 3-12. TABLE 3-12: KSZ8851SNL EEPROM FORMAT WORD 15:8 0H 3.7 7:0 Reserved 1H Host MAC Address Byte 2 Host MAC Address Byte 1 2H Host MAC Address Byte 4 Host MAC Address Byte 3 3H Host MAC Address Byte 6 Host MAC Address Byte 5 4H - 6H Reserved 7H - 3FH Not used for KSZ8851SNL (available for user to use) Loopback Support The KSZ8851SNL provides two loopback modes: Near-end (Remote) loopback to support for remote diagnostic of failure at line side, and Far-end (Local) loopback to support for local diagnostic of failure at host side. In loopback mode, the speed at the PHY port will be set to 100BASE-TX full-duplex mode. 3.7.1 NEAR-END LOOPBACK Near-end (Remote) loopback is conducted at PHY port 1 of the KSZ8851SNL. The loopback path starts at the PHY port’s receive inputs (RXP/RXM), wraps around at the same PHY port’s PMD/PMA, and ends at the PHY port’s transmit outputs (TXP/TXM). Bit [9] of register P1SCLMD (0xF4) is used to enable near-end loopback. The ports 1 near-end loopback path is illustrated in the following Figure 3-12. 3.7.2 FAR-END (LOCAL) LOOPBACK Far-end (Local) loopback is conducted at Host of the KSZ8851SNL. The loopback path starts at the host SPI FIFO write to transmit data, wraps around at the PHY port’s PMD/PMA, and ends at the host SPI FIFO read to receive data. Bit [14] of register P1MBCR (0xE4) is used to enable far-end loopback at host side. The host far-end loopback path is illustrated in the following Figure 3-12. DS00002381C-page 30  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI FIGURE 3-12: PHY PORT 1 NEAR-END (REMOTE) AND HOST FAR-END (LOCAL) LOOPBACK PATHS RXP/ RXM TXP/ TXM (PHY Port 1 Near-end remote Loopback) PMD1/PMA1 PCS1 MAC1 RXQ/TXQ QMU/DMA SPI I/F Unit Host SPI FIFO Read  2017-2021 Microchip Technology Inc. (Host Far-end local Loopback) Host SPI FIFO Write DS00002381C-page 31 KSZ8851SNL/SNLI 4.0 REGISTER DESCRIPTIONS 4.1 SPI Interface to I/O Registers The KSZ8851SNL provides a SPI interface for the host CPU to access its internal I/O registers. I/O registers serve as the address that the microprocessor uses when communicating with the device. This is used for configuring operational settings, reading or writing control, status information, and transferring packets. 4.1.1 I/O REGISTERS The following I/O Space Mapping Tables apply to 8-bit, 16-bit, or 32-bit access. Depending upon the byte enable bits B[3:0] settings in command phase, each I/O access can be performed the following operations as an 8-bit for 256 address locations, 16-bit for 128 address locations, or 32-bit for 64 address locations. TABLE 4-1: INTERNAL I/O REGISTERS SPACE MAPPING I/O Register Offset Location Register Name Default Value Description 32-Bit 16-Bit 8-Bit 0x00 to 0x03 0x00 - 0x01 0x00 0x01 0x02 - 0x03 0x02 0x03 0x04 to 0x07 0x04 - 0x05 0x04 0x05 0x06 - 0x07 0x06 0x07 0x08 to 0x0B 0x08 - 0x09 0x08 0x09 CCR 0x0A - 0x0B 0x0A 0x0B Reserved Don’t Care None 0x0C to 0x0F 0x0C - 0x0D 0x0C 0x0D 0x0E 0x0F Reserved Don’t Care None 0x0E - 0x0F 0x10 to 0x13 0x10 - 0x11 0x10 0x11 MARL — MAC Address Register Low [7:0] MAC Address Register Low [15:8] 0x12 - 0x13 0x12 0x13 MARM — MAC Address Register Middle [7:0] MAC Address Register Middle [15:8] 0x14 to 0x17 0x14 - 0x15 0x14 0x15 MARH — MAC Address Register High [7:0] MAC Address Register High [15:8] 0x16 - 0x17 0x16 0x17 Reserved Don’t Care None 0x18 to 0x1B 0x18 - 0x19 0x18 0x19 0x1A 0x1B Reserved Don’t Care None 0x1A - 0x1B 0x1C to 0x1F 0x1C - 0x1D 0x1C 0x1D 0x1E 0x1F Reserved Don’t Care None 0x1E - 0x1F 0x20 to 0x23 0x20 - 0x21 0x20 0x21 OBCR 0x0000 On-Chip Bus Control Register [7:0] On-Chip Bus Control Register [15:8] 0x22 - 0x23 0x22 0x23 EEPCR 0x0000 EEPROM Control Register [7:0] EEPROM Control Register [15:8] DS00002381C-page 32 Reserved Don’t Care None Reserved Don’t Care None Read Only Chip Configuration Register [7:0] Chip Configuration Register [15:8]  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-1: INTERNAL I/O REGISTERS SPACE MAPPING (CONTINUED) I/O Register Offset Location Register Name Default Value Description 32-Bit 16-Bit 8-Bit 0x24 to 0x27 0x24 - 0x25 0x24 0x25 MBIR 0x1010 Memory BIST Info Register [7:0] Memory BIST Info Register [15:8] 0x26 - 0x27 0x26 0x27 GRR 0x0000 Global Reset Register [7:0] Global Reset Register [15:8] 0x28 to 0x2B 0x28 - 0x29 0x28 0x29 Reserved 0x2A - 0x2B 0x2A 0x2B WFCR 0x2C to 0x2F 0x2C - 0x2D 0x2C 0x2D 0x2E - 0x2F 0x2E 0x2F 0x30 to 0x33 0x30 - 0x31 0x30 0x31 WF0CRC0 0x0000 Wakeup Frame 0 CRC0 Register [7:0] Wakeup Frame 0 CRC0 Register [15:8] 0x32 - 0x33 0x32 0x33 WF0CRC1 0x0000 Wakeup Frame 0 CRC1 Register [7:0] Wakeup Frame 0 CRC1 Register [15:8] 0x34 - 0x35 0x34 0x35 0x0000 Wakeup Frame 0 Byte Mask 0 Register [7:0] Wakeup Frame 0 Byte Mask 0 Register [15:8] 0x36 - 0x37 0x36 0x37 0x0000 Wakeup Frame 0 Byte Mask 1 Register [7:0] Wakeup Frame 0 Byte Mask 1 Register [15:8] 0x38 - 0x39 0x38 0x39 0x0000 Wakeup Frame 0 Byte Mask 2 Register [7:0] Wakeup Frame 0 Byte Mask 2 Register [15:8] 0x3A - 0x3B 0x3A 0x3B 0x0000 Wakeup Frame 0 Byte Mask 3 Register [7:0] Wakeup Frame 0 Byte Mask 3 Register [15:8] 0x3C To 0x3F 0x3C - 0x3D 0x3C 0x3D 0x3E - 0x3F 0x3E 0x3F 0x40 to 0x43 0x40 - 0x41 0x40 0x41 WF1CRC0 0x0000 Wakeup Frame 1 CRC0 Register [7:0] Wakeup Frame 1 CRC0 Register [15:8] 0x42 - 0x43 0x42 0x43 WF1CRC1 0x0000 Wakeup Frame 1 CRC1 Register [7:0] Wakeup Frame 1 CRC1 Register [15:8] 0x44 - 0x45 0x44 0x45 0x0000 Wakeup Frame 1 Byte Mask 0 Register [7:0] Wakeup Frame 1 Byte Mask 0 Register [15:8] 0x46 - 0x47 0x46 0x47 0x0000 Wakeup Frame 1 Byte Mask 1 Register [7:0] Wakeup Frame 1 Byte Mask 1 Register [15:8] 0x34 to 0x37 0x38 to 0x3B 0x44 to 0x47  2017-2021 Microchip Technology Inc. Reserved WF0BM0 WF0BM1 WF0BM2 WF0BM3 Reserved WF1BM0 WF1BM1 Don’t Care None 0x0000 Wakeup Frame Control Register [7:0] Wakeup Frame Control Register [15:8] Don’t Care None Don’t Care None DS00002381C-page 33 KSZ8851SNL/SNLI TABLE 4-1: INTERNAL I/O REGISTERS SPACE MAPPING (CONTINUED) I/O Register Offset Location 32-Bit Register Name Default Value Description 16-Bit 8-Bit 0x48 - 0x49 0x48 0x49 0x4A - 0x4B 0x4A 0x4B 0x4C to 0x4F 0x4C - 0x4D 0x4C 0x4D 0x4E - 0x4F 0x4E 0x4F 0x50 to 0x53 0x50 - 0x51 0x50 0x51 WF2CRC0 0x0000 Wakeup Frame 2 CRC0 Register [7:0] Wakeup Frame 2 CRC0 Register [15:8] 0x52 - 0x53 0x52 0x53 WF2CRC1 0x0000 Wakeup Frame 2 CRC1 Register [7:0] Wakeup Frame 2 CRC1 Register [15:8] 0x54 - 0x55 0x54 0x55 0x0000 Wakeup Frame 2 Byte Mask 0 Register [7:0] Wakeup Frame 2 Byte Mask 0 Register [15:8] 0x56 - 0x57 0x56 0x57 0x0000 Wakeup Frame 2 Byte Mask 1 Register [7:0] Wakeup Frame 2 Byte Mask 1 Register [15:8] 0x58 - 0x59 0x58 0x59 0x0000 Wakeup Frame 2 Byte Mask 2 Register [7:0] Wakeup Frame 2 Byte Mask 2 Register [15:8] 0x5A - 0x5B 0x5A 0x5B 0x0000 Wakeup Frame 2 Byte Mask 3 Register [7:0] Wakeup Frame 2 Byte Mask 3 Register [15:8] 0x5C to 0x5F 0x5C - 0x5D 0x5C 0x5D 0x5E - 0x5F 0x5E 0x5F 0x60 to 0x63 0x60 - 0x61 0x60 0x61 WF3CRC0 0x0000 Wakeup Frame 3 CRC0 Register [7:0] Wakeup Frame 3 CRC0 Register [15:8] 0x62 - 0x63 0x62 0x63 WF3CRC1 0x0000 Wakeup Frame 3 CRC1 Register [7:0] Wakeup Frame 3 CRC1 Register [15:8] 0x64 - 0x65 0x64 0x65 0x0000 Wakeup Frame 3 Byte Mask 0 Register [7:0] Wakeup Frame 3 Byte Mask 0 Register [15:8] 0x66 - 0x67 0x66 0x67 0x0000 Wakeup Frame 3 Byte Mask 1 Register [7:0] Wakeup Frame 3 Byte Mask 1 Register [15:8] 0x48 to 0x4B 0x54 to 0x57 0x58 to 0x5B 0x64 to 0x67 DS00002381C-page 34 WF1BM2 WF1BM3 Reserved WF2BM0 WF2BM1 WF2BM2 WF2BM3 Reserved WF3BM0 WF3BM1 0x0000 Wakeup Frame 1 Byte Mask 2 Register [7:0] Wakeup Frame 1 Byte Mask 2 Register [15:8] 0x0000 Wakeup Frame 1 Byte Mask 3 Register [7:0] Wakeup Frame 1 Byte Mask 3 Register [15:8] Don’t Care None Don’t Care None  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-1: INTERNAL I/O REGISTERS SPACE MAPPING (CONTINUED) I/O Register Offset Location 32-Bit Register Name Default Value Description 16-Bit 8-Bit 0x68 - 0x69 0x68 0x69 0x6A - 0x6B 0x6A 0x6B 0x6C to 0x6F 0x6C - 0x6D 0x6C 0x6D 0x6E - 0x6F 0x6E 0x6F 0x70 to 0x73 0x70 - 0x71 0x70 0x71 TXCR 0x0000 Transmit Control Register [7:0] Transmit Control Register [15:8] 0x72 - 0x73 0x72 0x73 TXSR 0x0000 Transmit Status Register [7:0] Transmit Status Register [15:8] 0x74 to 0x77 0x74 - 0x75 0x74 0x75 RXCR1 0x0800 Receive Control Register 1 [7:0] Receive Control Register 1 [15:8] 0x76 - 0x77 0x76 0x77 RXCR2 0x0004 Receive Control Register 2 [7:0] Receive Control Register 2 [15:8] 0x78 to 0x7B 0x78 - 0x79 0x78 0x79 TXMIR 0x0000 TXQ Memory Information Register [7:0] TXQ Memory Information Register [15:8] 0x7A - 0x7B 0x7A 0x7B Reserved 0x7C - 0x7D 0x7C 0x7D 0x7E - 0x7F 0x7E 0x7F 0x80 to 0x83 0x80 - 0x81 0x68 to 0x6B WF3BM2 WF3BM3 Reserved 0x0000 Wakeup Frame 3 Byte Mask 2 Register [7:0] Wakeup Frame 3 Byte Mask 2 Register [15:8] 0x0000 Wakeup Frame 3 Byte Mask 3 Register [7:0] Wakeup Frame 3 Byte Mask 3 Register [15:8] Don’t Care None Don’t Care None 0x0000 Receive Frame Header Status Register [7:0] Receive Frame Header Status Register [15:8] RXFHBCR 0x0000 Receive Frame Header Byte Count Register [7:0] Receive Frame Header Byte Count Register [15:8] 0x80 0x81 TXQCR 0x0000 TXQ Command Register [7:0] TXQ Command Register [15:8] 0x82 - 0x83 0x82 0x83 RXQCR 0x0000 RXQ Command Register [7:0] RXQ Command Register [15:8] 0x84 to 0x87 0x84 - 0x85 0x84 0x85 TXFDPR 0x0000 TX Frame Data Pointer Register [7:0] TX Frame Data Pointer Register [15:8] 0x86 - 0x87 0x86 0x87 RXFDPR 0x0000 RX Frame Data Pointer Register [7:0] RX Frame Data Pointer Register [15:8] 0x88 to 0x8B 0x88 - 0x89 0x88 0x89 0x8A - 0x8B 0x8A 0x8B 0x7C to 0x7F  2017-2021 Microchip Technology Inc. RXFHSR Reserved Don’t Care None DS00002381C-page 35 KSZ8851SNL/SNLI TABLE 4-1: INTERNAL I/O REGISTERS SPACE MAPPING (CONTINUED) I/O Register Offset Location 32-Bit 16-Bit 8-Bit 0x8C - 0x8D 0x8C 0x8D 0x8E - 0x8F 0x8E 0x8F 0x90 to 0x93 0x90 - 0x91 0x94 to 0x97 0x9C to 0x9F 0xA0 to 0xA3 0xA4 to 0xA7 0xA8 to 0xAB 0xAC to 0xAF Default Value Description 0x0000 RX Duration Timer Threshold Register [7:0] RX Duration Timer Threshold Register [15:8] RXDBCTR 0x0000 RX Data Byte Count Threshold Register [7:0] RX Data Byte Count Threshold Register [15:8] 0x90 0x91 IER 0x0000 Interrupt Enable Register [7:0] Interrupt Enable Register [15:8] 0x92 - 0x93 0x92 0x93 ISR 0x0300 Interrupt Status Register [7:0] Interrupt Status Register [15:8] 0x94 - 0x95 0x94 0x95 0x96 - 0x97 0x96 0x97 0x98 - 0x99 0x98 0x99 0x9A - 0x9B 0x9A 0x9B 0x9C - 0x9D 0x9C 0x9D RXFCTR 0x0000 RX Frame Count & Threshold Register [7:0] RX Frame Count & Threshold Register [15:8] 0x9E - 0x9F 0x9E 0x9F TXNTFSR 0x0000 TX Next Total Frames Size Register [7:0] TX Next Total Frames Size Register [15:8] 0xA0 - 0xA1 0xA0 0xA1 MAHTR0 0x0000 MAC Address Hash Table Register 0 [7:0] MAC Address Hash Table Register 0 [15:8] 0xA2 - 0xA3 0xA2 0xA3 MAHTR1 0x0000 MAC Address Hash Table Register 1 [7:0] MAC Address Hash Table Register 1 [15:8] 0xA4 - 0xA5 0xA4 0xA5 MAHTR2 0x0000 MAC Address Hash Table Register 2 [7:0] MAC Address Hash Table Register 2 [15:8] 0xA6 - 0xA7 0xA6 0xA7 MAHTR3 0x0000 MAC Address Hash Table Register 3 [7:0] MAC Address Hash Table Register 3 [15:8] 0xA8 - 0xA9 0xA8 0xA9 0xAA - 0xAB 0xAA 0xAB 0xAC - 0xAD 0xAC 0xAD 0xAE - 0xAF 0xAE 0xAF 0x8C to 0x8F 0x98 to 0x9B Register Name DS00002381C-page 36 RXDTTR Reserved Don’t Care None Reserved Don’t Care None Reserved Don’t Care None Reserved Don’t Care None  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-1: INTERNAL I/O REGISTERS SPACE MAPPING (CONTINUED) I/O Register Offset Location 32-Bit Register Name Default Value Description 16-Bit 8-Bit 0xB0 - 0xB1 0xB0 0xB1 0xB2 - 0xB3 0xB2 0xB3 0xB4 - 0xB5 0xB4 0xB5 FCOWR 0xB6 - 0xB7 0xB6 0xB7 Reserved Don’t Care None 0xB8 - 0xB9 0xB8 0xB9 0xBA 0xBB Reserved Don’t Care None 0xBA - 0xBB 0xBC to 0xBF 0xBC - 0xBD 0xBC 0xBD 0xBE 0xBF Reserved Don’t Care None 0xBE - 0xBF 0xC0 to 0xC3 0xC0 - 0xC1 0xC0 0xC1 CIDER 0xC2 - 0xC3 0xC2 0xC3 Reserved Don’t Care None 0xC4 to 0xC7 0xC4 - 0xC5 0xC4 0xC5 Reserved Don’t Care None 0xC6 - 0xC7 0xC6 0xC7 CGCR 0x0835 Chip Global Control Register [7:0] Chip Global Control Register [15:8] 0xC8 to 0xCB 0xC8 - 0xC9 0xC8 0xC9 IACR 0x0000 Indirect Access Control Register [7:0] Indirect Access Control Register [15:8] 0xCA - 0xCB 0xCA 0xCB Reserved Don’t Care None 0xCC - 0xCD 0xCC 0xCD 0xCE 0xCF Reserved Don’t Care None 0xCE - 0xCF 0xD0 - 0xD1 0xD0 0xD1 0xB0 to 0xB3 0xB4 to 0xB7 0xB8 to 0xBB 0xCC to 0xCF 0xD0 to 0xD3 0xD4 to 0xD7 0xD2 - 0xD3 0xD2 0xD3 FCLWR FCHWR 0x0500 Flow Control Low Watermark Register [7:0] Flow Control Low Watermark Register [15:8] 0x0300 Flow Control High Watermark Register [7:0] Flow Control High Watermark Register [15:8] 0x0040 Flow Control Overrun Watermark Register [7:0] Flow Control Overrun Watermark Register [15:8] 0x8870 Chip ID and Enable Register [7:0] Chip ID and Enable Register [15:8] IADLR 0x0000 Indirect Access Data Low Register [7:0] Indirect Access Data Low Register [15:8] IADHR 0x0000 Indirect Access Data High Register [7:0] Indirect Access Data High Register [15:8] 0xD4 - 0xD5 0xD4 0xD5 PMECR 0x0080 Power Management Event Control Register [7:0] Power Management Event Control Register [15:8] 0xD6 - 0xD7 0xD6 0xD7 GSWUTR 0X080C Go-Sleep & Wake-Up Time Register [7:0] Go-Sleep & Wake-Up Time Register [15:8]  2017-2021 Microchip Technology Inc. DS00002381C-page 37 KSZ8851SNL/SNLI TABLE 4-1: INTERNAL I/O REGISTERS SPACE MAPPING (CONTINUED) I/O Register Offset Location Register Name Default Value Description 0x0000 PHY Reset Register [7:0] PHY Reset Register [15:8] 32-Bit 16-Bit 8-Bit 0xD8 to 0xDB 0xD8 - 0xD9 0xD8 0xD9 PHYRR 0xDA - 0xDB 0xDA 0xDB Reserved Don’t Care None 0xDC to 0xDF 0xDC - 0xDD 0xDC 0xDD 0xDE 0xDF Reserved Don’t Care None 0xDE - 0xDF 0xE0 to 0xE3 0xE0 - 0xE1 0xE0 0xE1 0xE2 0xE3 Reserved Don’t Care None 0xE2 - 0xE3 0xE4 - 0xE5 0xE4 0xE5 0xE6 - 0xE7 0xE6 0xE7 0xE8 - 0xE9 0x3120 PHY 1 MII-Register Basic Control Register [7:0] PHY 1 MII-Register Basic Control Register [15:8] P1MBSR 0x7808 PHY 1 MII-Register Basic Status Register [7:0] PHY 1 MII-Register Basic Status Register [15:8] 0xE8 0xE9 PHY1ILR 0x1430 PHY 1 PHY ID Low Register [7:0] PHY 1 PHY ID Low Register [15:8] 0xEA - 0xEB 0xEA 0xEB PHY1IHR 0x0022 PHY 1 PHY ID High Register [7:0] PHY 1 PHY ID High Register [15:8] 0xEC - 0xED 0xEC 0xED 0x05E1 PHY 1 Auto-Negotiation Advertisement Register [7:0] PHY 1 Auto-Negotiation Advertisement Register [15:8] 0xEE - 0xEF 0xEE 0xEF 0x0001 PHY 1 Auto-Negotiation Link Partner Ability Register [7:0] PHY 1 Auto-Negotiation Link Partner Ability Register [15:8] 0xF0 - 0xF1 0xF0 0xF1 0xF2 - 0xF3 0xF2 0xF3 0xF4 - 0xF5 0xF4 0xF5 P1SCLMD 0x0000 Port 1 PHY Special Control/Status, LinkMD® [7:0] Port 1 PHY Special Control/Status, LinkMD® [15:8] 0xF6 - 0xF7 0xF6 0xF7 P1CR 0x00FF Port 1 Control Register [7:0] Port 1 Control Register [15:8] 0xF8 - 0xF9 0xF8 0xF9 P1SR 0x8080 Port 1 Status Register [7:0] Port 1 Status Register [15:8] 0xFA - 0xFB 0xFA 0xFB Reserved Don’t Care None 0xFC - 0xFD 0xFC 0xFD 0xFE 0xFF Reserved Don’t Care None 0xFE - 0xFF 0xE4 to 0xE7 0xE8 to 0xEB 0xEC to 0xEF 0xF0 to 0xF3 0xF4 to 0xF7 0xF8 to 0xFB 0xFC to 0xFF DS00002381C-page 38 P1MBCR P1ANAR P1ANLPR Reserved Don’t Care None  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 4.2 Register Map: MAC, PHY, and QMU Do not write to bit values or to registers defined as Reserved. Manipulating reserved bits or registers causes unpredictable and often fatal results. If the user wants to write to these reserved bits, the user has to read back these reserved bits (RO or RW) first, then “OR” with the read value of the reserved bits and write back to these reserved bits. Bit Type Definition • • • • RO = Read only. WO = Write only. RW = Read/Write. W1C = Write 1 to Clear (writing an “1” to clear this bit). 0x00 – 0x07: Reserved Chip Configuration Register (0x08 – 0x09): CCR This register indicates the chip configuration mode based on strapping and bonding options. TABLE 4-2: CHIP CONFIGURATION REGISTER (0X08 – 0X09) Bit R/W Description Default 15-10 RO Reserved — 9 RO EEPROM presence The EED_IO (pin 6) value is latched into this bit during power-up/reset. 0: No external EEPROM, 1: Use external EEPROM. — 8 RO SPI bus mode To indicate this is SPI interface for host 0: No, 1: Yes. — 7-4 RO Reserved 0x0 3 RO Reserved 0 2 RO Reserved 0 1 RO Reserved 0 0 RO 32-Pin Chip Package To indicate this device is KSZ8851SNL. 0: No, 1: Yes — 0x0A – 0x0F: Reserved Host MAC Address Registers: MARL, MARM, and MARH These Host MAC address registers are loaded starting at word location 0x1 of the EEPROM upon hardware reset. The software driver can read or write these registers value, but it will not modify the original Host MAC address value in the EEPROM. These six bytes of Host MAC address in external EEPROM are loaded to these three registers as mapping below: • MARL[15:0] = EEPROM 0x1 (MAC Byte 2 and 1) • MARM[15:0] = EEPROM 0x2 (MAC Byte 4 and 3) • MARH[15:0] = EEPROM 0x3 (MAC Byte 6 and 5) The Host MAC address is used to define the individual destination address that the KSZ8851SNL responds to when receiving frames. Network addresses are generally expressed in the form of 01:23:45:67:89:AB, where the bytes are received from left to right, and the bits within each byte are received from right to left (LSB to MSB). For example, the actual transmitted and received bits are on the order of 10000000 11000100 10100010 11100110 10010001 11010101. These three registers value for Host MAC address 01:23:45:67:89:AB will be held as below: • MARL[15:0] = 0x89AB • MARM[15:0] = 0x4567 • MARH[15:0] = 0x0123 Host MAC Address Register Low (0x10 – 0x11): MARL The following table shows the register bit fields for Low word of Host MAC address.  2017-2021 Microchip Technology Inc. DS00002381C-page 39 KSZ8851SNL/SNLI TABLE 4-3: HOST MAC ADDRESS REGISTER LOW (0X10 – 0X11) Bit R/W Description 15-0 RW MARL MAC Address Low The least significant word of the MAC address. Default — Host MAC Address Register Middle (0x12 – 0x13): MARM The following table shows the register bit fields for middle word of Host MAC address. TABLE 4-4: HOST MAC ADDRESS REGISTER MIDDLE (0X12 – 0X13) Bit R/W Description 15-0 RW MARM MAC Address Middle The middle word of the MAC address. Default — Host MAC Address Register High (0x14 – 0x15): MARH The following table shows the register bit fields for high word of Host MAC address. TABLE 4-5: HOST MAC ADDRESS REGISTER HIGH (0X14 – 0X15) Bit R/W Description 15-0 RW MARH MAC Address High The most significant word of the MAC address. Default — 0x16 – 0x1F: Reserved On-Chip Bus Control Register (0x20 – 0x21): OBCR This register controls the on-chip bus clock speed for the KSZ8851SNL. The default of the on-chip bus clock speed is 125 MHz. When the external host CPU is running at a higher clock rate, the on-chip bus should be adjusted for the best performance. TABLE 4-6: ON-CHIP BUS CONTROL REGISTER (0X20 – 0X21) Bit R/W Description Default 15-7 RO Reserved — 6 RW Output Pin Drive Strength Bi-directional or output pad drive strength selection. 0: 8 mA 1: 16 mA 0 5-3 RO Reserved 2 RW On-Chip Bus Clock Selection 0: 125 MHz (default setting is divided by 1, Bit[1:0]=00) 1: N/A (reserved) 0 1-0 RW On-Chip Bus Clock Divider Selection 00: Divided by 1. 01: Divided by 2. 10: Divided by 3. 11: N/A (reserved). For example to control the bus clock speed as below: If Bit 2 = 0 and this value is set 00 to select 125 MHz. If Bit 2 = 0 and this value is set 01 to select 62.5 MHz. 0x0 0x0 EEPROM Control Register (0x22 – 0x23): EEPCR To support an external EEPROM, pulled-up the EED_IO pin to High; otherwise, it is pulled-down to Low. If an external EEPROM is not used, the software programs the host MAC address. If an EEPROM is used in the design, the chip host MAC address is loaded from the EEPROM immediately after reset. The KSZ8851SNL allows the software to access (read and write) the EEPROM directly; that is, the EEPROM access timing can be fully controlled by the software if the EEPROM Software Access bit is set. DS00002381C-page 40  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-7: EEPROM CONTROL REGISTER (0X22 – 0X23) Bit R/W Description Default 15-6 RO Reserved. — 5 WO EESRWA EEPROM Software Read or Write Access 0: software read enable to access EEPROM when software access enabled (bit 4 is “1”) 1: software write enable to access EEPROM when software access enabled (bit 4 is “1”). 0 4 RW EESA EEPROM Software Access 1: enable software to access EEPROM through bit 3 to bit 0. 0: disable software to access EEPROM. 0 3 RO EESB EEPROM Status Bit Data Receive from EEPROM. This bit directly reads the EED_IO pin 6. — 2-0 RW EECB EEPROM Control Bits Bit 2: Data Transmit to EEPROM. This bit directly controls the device’s EED_IO pin 6. Bit 1: Serial Clock. This bit directly controls the device’s EESK pin 7. Bit 0: Chip Select for EEPROM. This bit directly controls the device’s EECS pin 10. 0x0 Memory BIST Info Register (0x24 – 0x25): MBIR This register indicates the build-in self test result for both TX and RX memories after power-up/reset. TABLE 4-8: MEMORY BIST INFO REGISTER (0X24 – 0X25) Bit R/W Description Default 15-13 RO Reserved 12 RO TXMBF TX Memory BIST Test Finish When set, it indicates the Memory Built In Self Test completion for the TX Memory. — 11 RO TXMBFA TX Memory BIST Test Fail When set, it indicates the TX Memory Built In Self Test has failed. — 10-8 RO TXMBFC TX Memory BIST Test Fail Count To indicate the TX Memory Built In Self Test failed count — 7-5 RO Reserved — 4 RO RXMBF RX Memory Bist Finish When set, it indicates the Memory Built In Self Test completion for the RX Memory. — 3 RO RXMBFA RX Memory Bist Fail When set, it indicates the RX Memory Built In Self Test has failed. — 2-0 RO RXMBFC RX Memory BIST Test Fail Count To indicate the RX Memory Built In Self Test failed count. — 0x0 Global Reset Register (0x26 – 0x27): GRR This register controls the global and QMU reset functions with information programmed by the CPU. TABLE 4-9: GLOBAL RESET REGISTER (0X26 – 0X27) Bit R/W Description Default 15-2 RO Reserved 0x0000 1 RW QMU Module Soft Reset 1: Software reset is active to clear both TXQ and RXQ memories. 0: Software reset is inactive. QMU software reset will flush out all TX/RX packet data inside the TXQ and RXQ memories and reset all QMU registers to default value.  2017-2021 Microchip Technology Inc. 0 DS00002381C-page 41 KSZ8851SNL/SNLI TABLE 4-9: GLOBAL RESET REGISTER (0X26 – 0X27) Bit R/W Description Default 0 RW Global Soft Reset 1: Software reset is active. 0: Software reset is inactive. Global software reset will affect PHY, MAC, QMU, DMA, and the switch core, all registers value are set to default value. 0 0x28 – 0x29: Reserved Wakeup Frame Control Register (0x2A – 0x2B): WFCR This register holds control information programmed by the CPU to control the wake up frame function. TABLE 4-10: WAKEUP FRAME CONTROL REGISTER (0X2A – 0X2B) Bit R/W Description Default 15-8 RO Reserved 7 RW MPRXE Magic Packet RX Enable When set, it enables the magic packet pattern detection. When reset, the magic packet pattern detection is disabled. 0x00 0 6-4 RO Reserved 3 RW WF3E Wake up Frame 3 Enable When set, it enables the Wake up frame 3 pattern detection. When reset, the Wake up frame 3 pattern detection is disabled. 0 2 RW WF2E Wake up Frame 2 Enable When set, it enables the Wake up frame 2 pattern detection. When reset, the Wake up frame 2 pattern detection is disabled. 0 1 RW WF1E Wake up Frame 1 Enable When set, it enables the Wake up frame 1 pattern detection. When reset, the Wake up frame 1 pattern detection is disabled. 0 0 RW WF0E Wake up Frame 0 Enable When set, it enables the Wake up frame 0 pattern detection. When reset, the Wake up frame 0 pattern detection is disabled. 0 DS00002381C-page 42 0x0  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 0x2C – 0x2F: Reserved Wakeup Frame 0 CRC0 Register (0x30 – 0x31): WF0CRC0 This register contains the expected CRC values of the Wake up frame 0 pattern. The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard; it is taken over the bytes specified in the wake up byte mask registers. TABLE 4-11: WAKEUP FRAME 0 CRC0 REGISTER (0X30 – 0X31) Bit R/W Description Default 15-0 RW WF0CRC0 Wake up Frame 0 CRC (lower 16 bits) The expected CRC value of a Wake up frame 0 pattern. 0x0000 Wakeup Frame 0 CRC1 Register (0x32 – 0x33): WF0CRC1 This register contains the expected CRC values of the Wake up frame 0 pattern. The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard; it is taken over the bytes specified in the wake up byte mask registers. TABLE 4-12: WAKEUP FRAME 0 CRC1 REGISTER (0X32 – 0X33) Bit R/W Description Default 15-0 RW WF0CRC1 Wake up Frame 0 CRC (upper 16 bits). The expected CRC value of a Wake up frame 0 pattern. 0x0000 Wakeup Frame 0 Byte Mask 0 Register (0x34 – 0x35): WF0BM0 This register contains the first 16 bytes mask values of the Wake up frame 0 pattern. Setting bit 0 selects the first byte of the Wake up frame 0, setting bit 15 selects the 16th byte of the Wake up frame 0. TABLE 4-13: WAKEUP FRAME 0 BYTE MASK 0 REGISTER (0X34 – 0X35) Bit R/W Description Default 15-0 RW WF0BM0 Wake up Frame 0 Byte Mask 0 The first 16 bytes mask of a Wake up frame 0 pattern. 0x0000 Wakeup Frame 0 Byte Mask 1 Register (0x36 – 0x37): WF0BM1 This register contains the next 16 bytes mask values of the Wake up frame 0 pattern. Setting bit 0 selects the 17th byte of the Wake up frame 0. Setting bit 15 selects the 32nd byte of the Wake up frame 0. TABLE 4-14: WAKEUP FRAME 0 BYTE MASK 1 REGISTER (0X36 – 0X37) Bit R/W Description Default 15-0 RW WF0BM1 Wake up Frame 0 Byte Mask 1. The next 16 bytes mask covering bytes 17 to 32 of a Wake up frame 0 pattern. 0x0000 Wakeup Frame 0 Byte Mask 2 Register (0x38 – 0x39): WF0BM2 This register contains the next 16 bytes mask values of the Wake up frame 0 pattern. Setting bit 0 selects the 33rd byte of the Wake up frame 0. Setting bit 15 selects the 48th byte of the Wake up frame 0. TABLE 4-15: WAKEUP FRAME 0 BYTE MASK 2 REGISTER (0X38 – 0X39) Bit R/W Description Default 15-0 RW WF0BM2 Wake-up Frame 0 Byte Mask 2. The next 16 bytes mask covering bytes 33 to 48 of a Wake-up frame 0 pattern. 0x0000  2017-2021 Microchip Technology Inc. DS00002381C-page 43 KSZ8851SNL/SNLI Wakeup Frame 0 Byte Mask 3 Register (0x3A – 0x3B): WF0BM3 This register contains the last 16 bytes mask values of the Wake up frame 0 pattern. Setting bit 0 selects the 49th byte of the Wake up frame 0. Setting bit 15 selects the 64th byte of the Wake up frame 0. TABLE 4-16: WAKEUP FRAME 0 BYTE MASK 3 REGISTER (0X3A – 0X3B) Bit R/W Description Default 15-0 RW WF0BM3 Wake-up Frame 0 Byte Mask 3. The last 16 bytes mask covering bytes 49 to 64 of a Wake-up frame 0 pattern. 0x0000 0x3C – 0x3F: Reserved Wakeup Frame 1 CRC0 Register (0x40 – 0x41): WF1CRC0 This register contains the expected CRC values of the Wake up frame 1 pattern. The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard; it is taken over the bytes specified in the wake up byte mask registers. TABLE 4-17: WAKEUP FRAME 1 CRC0 REGISTER (0X40 – 0X41) Bit R/W Description Default 15-0 RW WF1CRC0 Wake-up frame 1 CRC (lower 16 bits). The expected CRC value of a Wake-up frame 1 pattern. 0x0000 Wakeup Frame 1 CRC1 Register (0x42 – 0x43): WF1CRC1 This register contains the expected CRC values of the Wake up frame 1 pattern. The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in the wake up byte mask registers. TABLE 4-18: WAKEUP FRAME 1 CRC1 REGISTER (0X42 – 0X43) Bit R/W Description Default 15-0 RW WF1CRC1 Wake-up frame 1 CRC (upper 16 bits). The expected CRC value of a Wake-up frame 1 pattern. 0x0000 Wakeup Frame 1 Byte Mask 0 Register (0x44 – 0x45): WF1BM0 This register contains the first 16 bytes mask values of the Wake up frame 1 pattern. Setting bit 0 selects the first byte of the Wake up frame 1, setting bit 15 selects the 16th byte of the Wake up frame 1. TABLE 4-19: WAKEUP FRAME 1 BYTE MASK 0 REGISTER (0X44 – 0X45) Bit R/W Description Default 15-0 RW WF1BM0 Wake-up frame 1 Byte Mask 0. The first 16 bytes mask of a Wake-up frame 1 pattern. 0x0000 Wakeup Frame 1 Byte Mask 1 Register (0x46 – 0x47): WF1BM1 This register contains the next 16 bytes mask values of the Wake up frame 1 pattern. Setting bit 0 selects the 17th byte of the Wake up frame 1. Setting bit 15 selects the 32nd byte of the Wake up frame 1. TABLE 4-20: WAKEUP FRAME 1 BYTE MASK 1 REGISTER (0X46 – 0X47) Bit R/W Description Default 15-0 RW WF1BM1 Wake-up frame 1 Byte Mask 1. The next 16 bytes mask covering bytes 17 to 32 of a Wake-up frame 1 pattern. 0x0000 DS00002381C-page 44  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI Wakeup Frame 1 Byte Mask 2 Register (0x48 – 0x49): WF1BM2 This register contains the next 16 bytes mask values of the Wake up frame 1 pattern. Setting bit 0 selects the 33rd byte of the Wake up frame 1. Setting bit 15 selects the 48th byte of the Wake up frame 1. TABLE 4-21: WAKEUP FRAME 1 BYTE MASK 2 REGISTER (0X48 – 0X49) Bit R/W Description Default 15-0 RW WF1BM2 Wake-up frame 1 Byte Mask 2. The next 16 bytes mask covering bytes 33 to 48 of a Wake-up frame 1 pattern. 0x0000 Wakeup Frame 1 Byte Mask 3 Register (0x4A – 0x4B): WF1BM3 This register contains the last 16 bytes mask values of the Wake up frame 1 pattern. Setting bit 0 selects the 49th byte of the Wake up frame 1. Setting bit 15 selects the 64th byte of the Wake up frame 1. TABLE 4-22: WAKEUP FRAME 1 BYTE MASK 3 REGISTER (0X4A – 0X4B) Bit R/W Description Default 15-0 RW WF1BM3 Wake-up frame 1 Byte Mask 3. The last 16 bytes mask covering bytes 49 to 64 of a Wake-up frame 1 pattern. 0x0000 0x4C – 0x4F: Reserved Wakeup Frame 2 CRC0 Register (0x50 – 0x51): WF2CRC0 This register contains the expected CRC values of the Wake up frame 2 pattern. The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in the wake up byte mask registers. TABLE 4-23: WAKEUP FRAME 2 CRC0 REGISTER (0X50 – 0X51) Bit R/W Description Default 15-0 RW WF2CRC0 Wake-up frame 2 CRC (lower 16 bits). The expected CRC value of a Wake-up frame 2 pattern. 0x0000 Wakeup Frame 2 CRC1 Register (0x52 – 0x53): WF2CRC1 This register contains the expected CRC values of the wake-up frame 2 pattern. The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in the wake up byte mask registers. TABLE 4-24: WAKEUP FRAME 2 CRC1 REGISTER (0X52 – 0X53) Bit R/W Description Default 15-0 R/W WF2CRC1 Wake-up frame 2 CRC (upper 16 bits). The expected CRC value of a Wake-up frame 2 pattern. 0x0000 Wakeup Frame 2 Byte Mask 0 Register (0x54 – 0x55): WF2BM0 This register contains the first 16 bytes mask values of the Wake up frame 2 pattern. Setting bit 0 selects the first byte of the Wake up frame 2, setting bit 15 selects the 16th byte of the Wake up frame 2. TABLE 4-25: WAKEUP FRAME 2 BYTE MASK 0 REGISTER (0X54 – 0X55) Bit R/W Description Default 15-0 R/W WF2BM0 Wake-up frame 2 Byte Mask 0. The first 16 bytes mask of a Wake-up frame 2 pattern. 0x0000  2017-2021 Microchip Technology Inc. DS00002381C-page 45 KSZ8851SNL/SNLI Wakeup Frame 2 Byte Mask 1 Register (0x56 – 0x57): WF2BM1 This register contains the next 16 bytes mask values of the Wake up frame 2 pattern. Setting bit 0 selects the 17th byte of the Wake up frame 2. Setting bit 15 selects the 32nd byte of the Wake up frame 2. TABLE 4-26: WAKEUP FRAME 2 BYTE MASK 1 REGISTER (0X56 – 0X57) Bit R/W Description Default 15-0 RW WF2BM1 Wake-up frame 2 Byte Mask 1. The next 16 bytes mask covering bytes 17 to 32 of a Wake-up frame 2 pattern. 0x0000 Wakeup Frame 2 Byte Mask 2 Register (0x58 – 0x59): WF2BM2 This register contains the next 16 bytes mask values of the Wake up frame 2 pattern. Setting bit 0 selects the 33rd byte of the Wake up frame 2. Setting bit 15 selects the 48th byte of the Wake up frame 2. TABLE 4-27: WAKEUP FRAME 2 BYTE MASK 2 REGISTER (0X58 – 0X59) Bit R/W Description 15-0 RW WF2BM2 Wake-up frame 2 Byte Mask 2. The next 16 bytes mask covering bytes 33 to 48 of a Wake-up frame 2 pattern. Default 0 Wakeup Frame 2 Byte Mask 3 Register (0x5A – 0x5B): WF2BM3 This register contains the last 16 bytes mask values of the Wake up frame 2 pattern. Setting bit 0 selects the 49th byte of the Wake up frame 2. Setting bit 15 selects the 64th byte of the Wake up frame 2. TABLE 4-28: WAKEUP FRAME 2 BYTE MASK 3 REGISTER (0X5A – 0X5B) Bit R/W Description Default 15-0 RW WF2BM3 Wake-up frame 2 Byte Mask 3. The last 16 bytes mask covering bytes 49 to 64 of a Wake-up frame 2 pattern. 0 0x5C – 0x5F: Reserved Wakeup Frame 3 CRC0 Register (0x60 – 0x61): WF3CRC0 This register contains the expected CRC values of the Wake up frame 3 pattern. The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in the wake-up byte mask registers. TABLE 4-29: WAKEUP FRAME 3 CRC0 REGISTER (0X60 – 0X61) Bit R/W Description Default 15-0 RW WF3CRC0 Wake-up frame 3 CRC (lower 16 bits). The expected CRC value of a Wake up frame 3 pattern. 0 Wakeup Frame 3 CRC1 Register (0x62 – 0x63): WF3CRC1 This register contains the expected CRC values of the Wake up frame 3 pattern. The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in the wake-up byte mask registers. TABLE 4-30: WAKEUP FRAME 3 CRC1 REGISTER (0X62 – 0X63) Bit R/W Description 15-0 RW WF3CRC1 Wake-up frame 3 CRC (upper 16 bits). The expected CRC value of a Wake up frame 3 pattern. DS00002381C-page 46 Default 0  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI Wakeup Frame 3 Byte Mask 0 Register (0x64 – 0x65): WF3BM0 This register contains the first 16 bytes mask values of the Wake up frame 3 pattern. Setting bit 0 selects the first byte of the Wake up frame 3, setting bit 15 selects the 16th byte of the Wake up frame 3. TABLE 4-31: WAKEUP FRAME 3 BYTE MASK 0 REGISTER (0X64 – 0X65) Bit R/W Description Default 15-0 RW WF3BM0 Wake up Frame 3 Byte Mask 0. The first 16 byte mask of a Wake up frame 3 pattern. 0 Wakeup Frame 3 Byte Mask 1 Register (0x66 – 0x67): WF3BM1 This register contains the next 16 bytes mask values of the Wake up frame 3 pattern. Setting bit 0 selects the 17th byte of the Wake up frame 3. Setting bit 15 selects the 32nd byte of the Wake up frame 3. TABLE 4-32: WAKEUP FRAME 3 BYTE MASK 1 REGISTER (0X66 – 0X67) Bit R/W Description 15-0 RW WF3BM1 Wake up Frame 3 Byte Mask 1. The next 16 bytes mask covering bytes 17 to 32 of a Wake up frame 3 pattern. Default 0 Wakeup Frame 3 Byte Mask 2 Register (0x68 – 0x69): WF3BM2 This register contains the next 16 bytes mask values of the Wake up frame 3 pattern. Setting bit 0 selects the 33rd byte of the Wake up frame 3. Setting bit 15 selects the 48th byte of the Wake up frame 3. TABLE 4-33: WAKEUP FRAME 3 BYTE MASK 2 REGISTER (0X68 – 0X69) Bit R/W Description Default 15-0 RW WF3BM2 Wake up Frame 3 Byte Mask 2. The next 16 bytes mask covering bytes 33 to 48 of a Wake up frame 3 pattern. 0 Wakeup Frame 3 Byte Mask 3 Register (0x6A – 0x6B): WF3BM3 This register contains the last 16 bytes mask values of the Wake up frame 3 pattern. Setting bit 0 selects the 49th byte of the Wake up frame 3. Setting bit 15 selects the 64th byte of the Wake up frame 3. TABLE 4-34: WAKEUP FRAME 3 BYTE MASK 3 REGISTER (0X6A – 0X6B) Bit R/W Description Default 15-0 RW WF3BM3 Wake up Frame 3 Byte Mask 3. The last 16 bytes mask covering bytes 49 to 64 of a Wake up frame 3 pattern. 0 0x6C – 0x6F: Reserved Transmit Control Register (0x70 – 0x71): TXCR This register holds control information programmed by the CPU to control the QMU transmit module function. TABLE 4-35: Bit TRANSMIT CONTROL REGISTER (0X70 – 0X71) R/W Description 15-9 RO Reserved 8 RW TCGICMP Transmit Checksum Generation for ICMP When this bit is set, The KSZ8851SNL is enabled to transmit ICMP frame (only for non-fragment frame) checksum generation. 0x0 7 RO Reserved 0x0 6 RW TCGTCP Transmit Checksum Generation for TCP When this bit is set, The KSZ8851SNL is enabled to transmit TCP frame checksum generation. 0x0  2017-2021 Microchip Technology Inc. Default — DS00002381C-page 47 KSZ8851SNL/SNLI TABLE 4-35: TRANSMIT CONTROL REGISTER (0X70 – 0X71) (CONTINUED) Bit R/W Description Default 5 RW TCGIP Transmit Checksum Generation for IP When this bit is set, The KSZ8851SNL is enabled to transmit IP header checksum generation. 0x0 4 RW FTXQ Flush Transmit Queue When this bit is set, The transmit queue memory is cleared and TX frame pointer is reset. Note: Disable the TXE transmit enable bit[0] first before set this bit, then clear this bit to normal operation. 0x0 3 RW TXFCE Transmit Flow Control Enable When this bit is set and the KSZ8851SNL is in full-duplex mode, flow control is enabled. The KSZ8851SNL transmits a PAUSE frame when the Receive Buffer capacity reaches a threshold level that will cause the buffer to overflow. When this bit is set and the KSZ8851SNL is in half-duplex mode, backpressure flow control is enabled. When this bit is cleared, no transmit flow control is enabled. 0x0 2 RW TXPE Transmit Padding Enable When this bit is set, the KSZ8851SNL automatically adds a padding field to a packet shorter than 64 bytes. Note: Setting this bit requires enabling the add CRC feature (bit1=1) to avoid CRC errors for the transmit packet. 0x0 1 RW TXCE Transmit CRC Enable When this bit is set, the KSZ8851SNL automatically adds a 32-bit CRC checksum field to the end of a transmit frame. 0x0 0 RW TXE Transmit Enable When this bit is set, the transmit module is enabled and placed in a running state. When reset, the transmit process is placed in the stopped state after the transmission of the current frame is completed. 0x0 Transmit Status Register (0x72 – 0x73): TXSR This register keeps the status of the last transmitted frame. TABLE 4-36: TRANSMIT STATUS REGISTER (0X72 – 0X73) Bit R/W Description Default 15-14 RO Reserved 0x0 13 RO TXLC Transmit Late Collision This bit is set when a transmit Late Collision occurs. 0x0 12 RO TXMC Transmit Maximum Collision This bit is set when a transmit Maximum Collision is reached. 0x0 11-6 RO Reserved — 5-0 RO TXFID Transmit Frame ID This field identifies the transmitted frame. All of the transmit status information in this register belongs to the frame with this ID. — Receive Control Register 1 (0x74 – 0x75): RXCR1 This register holds control information programmed by the CPU to control the receive function. DS00002381C-page 48  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-37: RECEIVE CONTROL REGISTER 1 (0X74 – 0X75) Bit R/W Description 15 RW FRXQ Flush Receive Queue When this bit is set, The receive queue memory is cleared and RX frame pointer is reset. Note: Disable the RXE receive enable bit[0] first before set this bit, then clear this bit to normal operation. 0x0 14 RW RXUDPFCC Receive UDP Frame Checksum Check Enable When this bit is set, the KSZ8851SNL will check for correct UDP checksum for incoming UDP frames. Any received UDP frames with incorrect checksum will be discarded. 0x0 13 RW RXTCPFCC Receive TCP Frame Checksum Check Enable When this bit is set, the KSZ8851SNL will check for correct TCP checksum for incoming TCP frames. Any received TCP frames with incorrect checksum will be discarded. 0x0 12 RW RXIPFCC Receive IP Frame Checksum Check Enable When this bit is set, the KSZ8851SNL will check for correct IP header checksum for incoming IP frames. Any received IP frames with incorrect checksum will be discarded. 0x0 11 RW RXPAFMA Receive Physical Address Filtering with MAC Address Enable When this bit is set, this bit enables the RX function to receive physical address that pass the MAC address filtering mechanism (see Address Filtering Scheme table for detail). 0x1 10 RW RXFCE Receive Flow Control Enable When this bit is set and the KSZ8851SNL is in full-duplex mode, flow control is enabled, and the KSZ8851SNL will acknowledge a PAUSE frame from the receive interface; i.e., the outgoing packets are pending in the transmit buffer until the PAUSE frame control timer expires. This field has no meaning in half-duplex mode and should be programmed to 0. When this bit is cleared, flow control is not enabled. 0x0 9 RW RXEFE Receive Error Frame Enable When this bit is set, CRC error frames are allowed to be received into the RX queue. When this bit is cleared, all CRC error frames are discarded. 0x0 8 RW RXMAFMA Receive Multicast Address Filtering with MAC Address Enable When this bit is set, this bit enables the RX function to receive multicast address that pass the MAC address filtering mechanism (see Address Filtering Scheme table for detail). 0x0 7 RW RXBE Receive Broadcast Enable When this bit is set, the RX module receives all the broadcast frames. 0x0 6 RW RXME Receive Multicast Enable When this bit is set, the RX module receives all the multicast frames (including broadcast frames). 0x0 5 RW RXUE Receive Unicast Enable When this bit is set, the RX module receives unicast frames that match the 48-bit Station MAC address of the module. 0x0 4 RW RXAE Receive All Enable When this bit is set, the KSZ8851SNL receives all incoming frames, regardless of the frame’s destination address (see Address Filtering Scheme table for detail). 0x0 3 RW Reserved 0x0 2 RW Reserved 0x0  2017-2021 Microchip Technology Inc. Default DS00002381C-page 49 KSZ8851SNL/SNLI TABLE 4-37: RECEIVE CONTROL REGISTER 1 (0X74 – 0X75) (CONTINUED) Bit R/W Description Default 1 RW RXINVF Receive Inverse Filtering When this bit is set, the KSZ8851SNL receives function with address check operation in inverse filtering mode (see Address Filtering Scheme table for detail). 0x0 0 RW RXE Receive Enable When this bit is set, the RX block is enabled and placed in a running state. When this bit is cleared, the receive process is placed in the stopped state upon completing reception of the current frame. 0x0 Receive Control Register 2 (0x76 – 0x77): RXCR2 This register holds control information programmed by the CPU to control the receive function. TABLE 4-38: RECEIVE CONTROL REGISTER 2 (0X76 – 0X77) Bit R/W Description 15-8 RO Reserved 7-5 WO SRDBL SPI Receive Data Burst Length These three bits are used to define for SPI receive data burst length during DMA operation from the host CPU to access RXQ frame buffer. 000: 4 Bytes data burst 001: 8 Bytes data burst 010: 16 Bytes data burst 011: 32 Bytes data burst 100: Single frame data burst 101-111: NA (reserved) Note: It needs RXQ FIFO Read command byte before each data burst. 0x0 4 RW IUFFP IPv4/IPv6/UDP Fragment Frame Pass When this bit is set, the KSZ8851SNL will pass the checksum check at receive side for IPv4/IPv6 UDP frame with fragment extension header. When this bit is cleared, the KSZ8851SNL will perform checksum operation based on configuration and doesn’t care whether it’s a fragment frame or not. 0x0 3 RW RXIUFCEZ Receive IPv4/IPv6/UDP Frame Checksum Equal Zero When this bit is set, the KSZ8851SNL will pass the filtering for IPv4/IPv6 UDP frame with UDP checksum equal to zero. When this bit is cleared, the KSZ8851SNL will drop IPv4/IPv6 UDP packet with UDP checksum equal to zero. 0x0 2 RW UDPLFE UDP Lite Frame Enable When this bit is set, the KSZ8851SNL will check the checksum at receive side and generate the checksum at transmit side for UDP Lite frame. When this bit is cleared, the KSZ8851SNL will pass the checksum check at receive side and skip the checksum generation at transmit side for UDP Lite frame. 0x1 1 RW RXICMPFCC Receive ICMP Frame Checksum Check Enable When this bit is set, the KSZ8851SNL will check for correct ICMP checksum for incoming ICMP frames (only for non-fragment frame). Any received ICMP frames with incorrect checksum will be discarded. 0x0 0 RW RXSAF Receive Source Address Filtering When this bit is set, the KSZ8851SNL will drop the frame if the source address is same as MAC address in MARL, MARM, MARH registers. 0x0 DS00002381C-page 50 Default —  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TXQ Memory Information Register (0x78 – 0x79): TXMIR This register indicates the amount of free memory available in the TXQ of the QMU module. TABLE 4-39: Bit TXQ MEMORY INFORMATION REGISTER (0X78 – 0X79) R/W Description Default 15-13 RO Reserved — 12-0 RO TXMA Transmit Memory Available The amount of memory available is represented in units of byte. The TXQ memory is used for both frame payload, control word. Note: Software must be written to ensure that there is enough memory for the next transmit frame including control information before transmit data is written to the TXQ. — 0x7A – 0x7B: Reserved Receive Frame Header Status Register (0x7C – 0x7D): RXFHSR This register indicates the received frame header status information, the received frames are reported in RXFCTR register. This register contains the status information for the frame received and the CPU can read so many times same as the frame count value in the RXFCTR. TABLE 4-40: RECEIVE FRAME HEADER STATUS REGISTER (0X7C – 0X7D) Bit R/W Description 15 RO RXFV Receive Frame Valid When this bit is set, it indicates that the present frame in the receive packet memory is valid. The status information currently in this location is also valid. When clear, it indicates that there is either no pending receive frame or that the current frame is still in the process of receiving. — 14 RO Reserved — 13 RO RXICMPFCS Receive ICMP Frame Checksum Status When this bit is set, the KSZ8851SNL received ICMP frame checksum field is incorrect. — 12 RO RXIPFCS Receive IP Frame Checksum Status When this bit is set, the KSZ8851SNL received IP header checksum field is incorrect. — 11 RO RXTCPFCS Receive TCP Frame Checksum Status When this bit is set, the KSZ8851SNL received TCP frame checksum field is incorrect. — 10 RO RXUDPFCS Receive UDP Frame Checksum Status When this bit is set, the KSZ8851SNL received UDP frame checksum field is incorrect. — 9-8 RO Reserved — 7 RO RXBF Receive Broadcast Frame When this bit is set, it indicates that this frame has a broadcast address. — 6 RO RXMF Receive Multicast Frame When this bit is set, it indicates that this frame has a multicast address (including the broadcast address). — 5 RO RXUF Receive Unicast Frame When this bit is set, it indicates that this frame has a unicast address. — 4 RO RXMR Receive MII Error When set, it indicates that there is an MII symbol error on the received frame. —  2017-2021 Microchip Technology Inc. Default DS00002381C-page 51 KSZ8851SNL/SNLI TABLE 4-40: RECEIVE FRAME HEADER STATUS REGISTER (0X7C – 0X7D) (CONTINUED) Bit R/W Description Default 3 RO RXFT Receive Frame Type When this bit is set, it indicates that the frame is an Ethernet-type frame (frame length is greater than 1500 bytes). When clear, it indicates that the frame is an IEEE 802.3 frame. This bit is not valid for runt frames. — 2 RO RXFTL Receive Frame Too Long When this bit is set, it indicates that the frame length exceeds the maximum size of 2000 bytes. Frames that are too long are passed to the host only if the pass bad frame bit is set. Note: Frame too long is only a frame length indication and does not cause any frame truncation. — 1 RO RXRF Receive Runt Frame When this bit is set, it indicates that a frame was damaged by a collision or had a premature termination before the collision window passed. Runt frames are passed to the host only if the pass bad frame bit is set. — 0 RO RXCE Receive CRC Error When this bit is set, it indicates that a CRC error has occurred on the current received frame. CRC error frames are passed to the host only if the pass bad frame bit is set. — Receive Frame Header Byte Count Register (0x7E – 0x7F): RXFHBCR This register indicates the received frame header byte count information, the received frames are reported in RXFCTR register. This register contains the total number of bytes information for the frame received and the CPU can read so many times same as the frame count value in the RXFCTR. TABLE 4-41: Bit RECEIVE FRAME HEADER BYTE COUNT REGISTER (0X7E – 0X7F) R/W Description Default 15-12 RO Reserved — 11-0 RO RXBC Receive Byte Count This field indicates the present received frame byte size. — TXQ Command Register (0x80 – 0x81): TXQCR This register is programmed by the Host CPU to issue a transmit command to the TXQ. The present transmit frame in the TXQ memory is queued for transmit. TABLE 4-42: TXQ COMMAND REGISTER (0X80 – 0X81) Bit R/W Description 15-3 RW Reserved 2 RW AETFE Auto-Enqueue TXQ Frame Enable When this bit is written as 1, the KSZ8851SNL will enable current all TX frames prepared in the TX buffer are queued to transmit automatically. The bit 0 METFE has to be set 0 when this bit is set to 1 in this register. 0x0 1 RW TXQMAM TXQ Memory Available Monitor When this bit is written as 1, the KSZ8851SNL will generate interrupt (bit 6 in ISR register) to CPU when TXQ memory is available based upon the total amount of TXQ space requested by CPU at TXNTFSR (0x9E) register. Note: This bit is self-clearing after the frame is finished transmitting. The software should wait for the bit to be cleared before set to 1 again. 0x0 DS00002381C-page 52 Default —  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-42: TXQ COMMAND REGISTER (0X80 – 0X81) (CONTINUED) Bit R/W Description Default 0 RW METFE Manual Enqueue TXQ Frame Enable When this bit is written as 1, the KSZ8851SNL will enable current TX frame prepared in the TX buffer is queued for transmit, this is only transmit one frame at a time. Note: This bit is self-clearing after the frame is finished transmitting. The software should wait for the bit to be cleared before setting up another new TX frame. 0x0 RXQ Command Register (0x82 – 0x83): RXQCR This register is programmed by the Host CPU to issue DMA read or write command to the RXQ and TXQ. This register also is used to control all RX thresholds enable and status. TABLE 4-43: RXQ COMMAND REGISTER (0X82 – 0X83) Bit R/W Description 15-13 RW Reserved — 12 RO RXDTTS RX Duration Timer Threshold Status When this bit is set, it indicates that RX interrupt is due to the time start at first received frame in RXQ buffer exceeds the threshold set in RX Duration Timer Threshold Register (0x8C, RXDTT). This bit will be updated when write 1 to bit 13 in ISR register. — 11 RO RXDBCTS RX Data Byte Count Threshold Status When this bit is set, it indicates that RX interrupt is due to the number of received bytes in RXQ buffer exceeds the threshold set in RX Data Byte Count Threshold Register (0x8E, RXDBCT). This bit will be updated when write 1 to bit 13 in ISR register. — 10 RO RXFCTS RX Frame Count Threshold Status When this bit is set, it indicates that RX interrupt is due to the number of received frames in RXQ buffer exceeds the threshold set in RX Frame Count Threshold Register (0x9C, RXFCT). This bit will be updated when write 1 to bit 13 in ISR register. — 9 RW RXIPHTOE RX IP Header Two-Byte Offset Enable When this bit is written as 1, the KSZ8851SNL will enable to add two bytes before frame header in order for IP header inside the frame contents to be aligned with double word boundary to speed up software operation. 0x0 8 RW Reserved 7 RW RXDTTE RX Duration Timer Threshold Enable When this bit is written as 1, the KSZ8851SNL will enable RX interrupt (bit 13 in ISR) when the time start at first received frame in RXQ buffer exceeds the threshold set in RX Duration Timer Threshold Register (0x8C, RXDTT). 0x0 6 RW RXDBCTE RX Data Byte Count Threshold Enable When this bit is written as 1, the KSZ8851SNL will enable RX interrupt (bit 13 in ISR) when the number of received bytes in RXQ buffer exceeds the threshold set in RX Data Byte Count Threshold Register (0x8E, RXDBCT). 0x0 5 RW RXFCTE RX Frame Count Threshold Enable When this bit is written as 1, the KSZ8851SNL will enable RX interrupt (bit 13 in ISR) when the number of received frames in RXQ buffer exceeds the threshold set in RX Frame Count Threshold Register (0x9C, RXFCT). 0x0  2017-2021 Microchip Technology Inc. Default — DS00002381C-page 53 KSZ8851SNL/SNLI TABLE 4-43: RXQ COMMAND REGISTER (0X82 – 0X83) (CONTINUED) Bit R/W Description Default 4 RW ADRFE Auto-Dequeue RXQ Frame Enable When this bit is written as 1, the KSZ8851SNL will automatically enable RXQ frame buffer dequeue. The read pointer in RXQ frame buffer will be automatically adjusted to next received frame location after current frame is completely read by the host. 0x0 3 WO SDA Start DMA Access When this bit is written as 1, the KSZ8851SNL allows a DMA operation from the host CPU to access either read RXQ frame buffer or write TXQ frame buffer with SPI command operation for RXQ/TXQ FIFO read/ write. All registers access are disabled except this register during this DMA operation. This bit must be set to 0 when DMA operation is finished in order to access the rest of registers. 0x0 2-1 RW Reserved 0 RW RRXEF Release RX Error Frame When this bit is written as 1, the current RX error frame buffer is released. Note: This bit is self-clearing after the frame memory is released. The software should wait for the bit to be cleared before processing new RX frame. — 0x0 TX Frame Data Pointer Register (0x84 – 0x85): TXFDPR The value of this register determines the address to be accessed within the TXQ frame buffer. When the AUTO increment is set, It will automatically increment the pointer value on write accesses to the data register. The counter is incremented by one for every byte access, by two for every word access, and by four for every double word access. TABLE 4-44: TX FRAME DATA POINTER REGISTER (0X84 – 0X85) Bit R/W Description Default 15 RO Reserved 14 RW TXFPAI TX Frame Data Pointer Auto Increment When this bit is set, the TX Frame data pointer register increments automatically on accesses to the data register. The increment is by one for every byte access, by two for every word access, and by four for every double word access. When this bit is reset, the TX frame data pointer is manually controlled by user to access the TX frame location. — 13-11 RO Reserved 10-0 RO TXFP TX Frame Pointer TX Frame Pointer index to the Frame Data register for access. This field reset to next available TX frame location when the TX Frame Data has been enqueued through the TXQ command register. 0x0 — 0x000 RX Frame Data Pointer Register (0x86 – 0x87): RXFDPR The value of this register determines the address to be accessed within the RXQ frame buffer. When the Auto Increment is set, it will automatically increment the RXQ Pointer on read accesses to the data register. The counter is incremented is by one for every byte access, by two for every word access, and by four for every double word access. TABLE 4-45: RX FRAME DATA POINTER REGISTER (0X86 – 0X87) Bit R/W Description 15 RO Reserved DS00002381C-page 54 Default —  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-45: RX FRAME DATA POINTER REGISTER (0X86 – 0X87) (CONTINUED) Bit R/W Description Default 14 RW RXFPAI RX Frame Pointer Auto Increment When this bit is set, the RXQ Address register increments automatically on accesses to the data register. The increment is by one for every byte access, by two for every word access, and by four for every double word access. When this bit is reset, the RX frame data pointer is manually controlled by user to access the RX frame location. 13-11 RO Reserved 10-0 WO RXFP RX Frame Pointer RX Frame data pointer index to the Data register for access. This pointer value must reset to 0x000 before each DMA operation from the host CPU to read RXQ frame buffer. 0x0 — 0x000 0x88 – 0x8B: Reserved RX Duration Timer Threshold Register (0x8C – 0x8D): RXDTTR This register is used to program the received frame duration timer threshold. TABLE 4-46: RX DURATION TIMER THRESHOLD REGISTER (0X8C – 0X8D) Bit R/W Description Default 15-0 RW RXDTT Receive Duration Timer Threshold To program received frame duration timer threshold value in 1us interval. The maximum value is 0xCFFF. When bit 7 set to 1 in RXQCR register, the KSZ8851SNL will set RX interrupt (bit 13 in ISR) after the time starts at first received frame in RXQ buffer and exceeds the threshold set in this register. 0x0000 RX Data Byte Count Threshold Register (0x8E – 0x8F): RXDBCTR This register is used to program the received data byte count threshold. TABLE 4-47: RX DATA BYTE COUNT THRESHOLD REGISTER (0X8E – 0X8F) Bit R/W Description Default 15-0 RW RXDBCT Receive Data Byte Count Threshold To program received data byte threshold value in byte count. When bit 6 set to 1 in RXQCR register, the KSZ8851SNL will set RX interrupt (bit 13 in ISR) when the number of received bytes in RXQ buffer exceeds the threshold set in this register. 0x0000 Interrupt Enable Register (0x90 – 0x91): IER This register enables the interrupts from the QMU and other sources. TABLE 4-48: INTERRUPT ENABLE REGISTER (0X90 – 0X91) Bit R/W Description 15 RW LCIE Link Change Interrupt Enable When this bit is set, the link change interrupt is enabled. When this bit is reset, the link change interrupt is disabled. 0x0 14 RW TXIE Transmit Interrupt Enable When this bit is set, the transmit interrupt is enabled. When this bit is reset, the transmit interrupt is disabled. 0x0 13 RW RXIE Receive Interrupt Enable When this bit is set, the receive interrupt is enabled. When this bit is reset, the receive interrupt is disabled. 0x0 12 RW Reserved 0x0  2017-2021 Microchip Technology Inc. Default DS00002381C-page 55 KSZ8851SNL/SNLI TABLE 4-48: INTERRUPT ENABLE REGISTER (0X90 – 0X91) (CONTINUED) Bit R/W Description Default 11 RW RXOIE Receive Overrun Interrupt Enable When this bit is set, the Receive Overrun interrupt is enabled. When this bit is reset, the Receive Overrun interrupt is disabled. 0x0 10 RW Reserved 0x0 9 RW TXPSIE Transmit Process Stopped Interrupt Enable When this bit is set, the Transmit Process Stopped interrupt is enabled. When this bit is reset, the Transmit Process Stopped interrupt is disabled. 0x0 8 RW RXPSIE Receive Process Stopped Interrupt Enable When this bit is set, the Receive Process Stopped interrupt is enabled. When this bit is reset, the Receive Process Stopped interrupt is disabled. 0x0 7 RW Reserved 0x0 6 RW TXSAIE Transmit Space Available Interrupt Enable When this bit is set, the Transmit memory space available interrupt is enabled. When this bit is reset, the Transmit memory space available interrupt is disabled. 0x0 5 RW RXWFDIE Receive Wake-up Frame Detect Interrupt Enable When this bit is set, the Receive wakeup frame detect interrupt is enabled. When this bit is reset, the Receive wakeup frame detect interrupt is disabled. 0x0 4 RW RXMPDIE Receive Magic Packet Detect Interrupt Enable When this bit is set, the Receive magic packet detect interrupt is enabled. When this bit is reset, the Receive magic packet detect interrupt is disabled. 0x0 3 RW LDIE Linkup Detect Interrupt Enable When this bit is set, the wake-up from linkup detect interrupt is enabled. When this bit is reset, the linkup detect interrupt is disabled. 0x0 2 RW EDIE Energy Detect Interrupt Enable When this bit is set, the wake-up from energy detect interrupt is enabled. When this bit is reset, the energy detect interrupt is disabled. 0x0 1 RW SPIBEIE SPI Bus Error Interrupt Enable When this bit is set, the SPI bus error interrupt is enabled. When this bit is reset, the SPI bus error interrupt is disabled. 0x0 0 RW DEDIE Delay Energy Detect Interrupt Enable When this bit is set, the delay energy detect interrupt is enabled. When this bit is reset, the delay energy detect interrupt is disabled. Note: the delay energy detect interrupt till device is ready for host access. 0x0 Interrupt Status Register (0x92 – 0x93): ISR This register contains the status bits for all QMU and other interrupt sources. When the corresponding enable bit is set, it causes the interrupt pin to be asserted. This register is usually read by the host CPU and device drivers during interrupt service routine or polling. The register bits are not cleared when read. The user has to write “1” to clear. DS00002381C-page 56  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-49: INTERRUPT STATUS REGISTER (0X92 – 0X93) Bit R/W Description Default 15 RO (W1C) LCIS Link Change Interrupt Status When this bit is set, it indicates that the link status has changed from link up to link down, or link down to link up. This edge-triggered interrupt status is cleared by writing 1 to this bit. 0x0 14 RO (W1C) TXIS Transmit Interrupt Status When this bit is set, it indicates that the TXQ MAC has transmitted at least a frame on the MAC interface and the QMU TXQ is ready for new frames from the host. This edge-triggered interrupt status is cleared by writing 1 to this bit. 0x0 13 RO (W1C) RXIS Receive Interrupt Status When this bit is set, it indicates that the QMU RXQ has received at least a frame from the MAC interface and the frame is ready for the host CPU to process. This edge-triggered interrupt status is cleared by writing 1 to this bit. 0x0 12 RO Reserved 0x0 11 RO (W1C) RXOIS Receive Overrun Interrupt Status When this bit is set, it indicates that the Receive Overrun status has occurred. This edge-triggered interrupt status is cleared by writing 1 to this bit. 0x0 10 RO Reserved 0x0 9 RO (W1C) TXPSIS Transmit Process Stopped Interrupt Status When this bit is set, it indicates that the Transmit Process has stopped. This edge-triggered interrupt status is cleared by writing 1 to this bit. 0x1 8 RO (W1C) RXPSIS Receive Process Stopped Interrupt Status When this bit is set, it indicates that the Receive Process has stopped. This edge-triggered interrupt status is cleared by writing 1 to this bit. 0x1 7 RO Reserved 0x0 6 RO (W1C) TXSAIS Transmit Space Available Interrupt Status When this bit is set, it indicates that Transmit memory space available status has occurred. When this bit is reset, the Transmit memory space available interrupt is disabled. 0x0 5 RO RXWFDIS Receive Wakeup Frame Detect Interrupt Status When this bit is set, it indicates that Receive wakeup frame detect status has occurred. Write “1000” to PMECR[5:2] to clear this bit 0x0 4 RO RXMPDIS Receive Magic Packet Detect Interrupt Status When this bit is set, it indicates that Receive magic packet detect status has occurred. Write “0100” to PMECR[5:2] to clear this bit. 0x0 3 RO LDIS Linkup Detect Interrupt Status When this bit is set, it indicates that wake-up from linkup detect status has occurred. Write “0010” to PMECR[5:2] to clear this bit. 0x0 2 RO EDIS Energy Detect Interrupt Status When this bit is set and bit 2=1, bit 0=0 in IER register, it indicates that wake-up from energy detect status has occurred. When this bit is set and bit 2, 0=1 in IER register, it indicates that wake-up from delay energy detect status has occurred. Write “0001” to PMECR[5:2] to clear this bit. 0x0 1 RO (W1C) SPIBEIS SPI Bus Error Interrupt Status When this bit is set, it indicates that SPI bus error status has occurred. This edge-triggered interrupt status is cleared by writing 1 to this bit. 0x0 0 RO Reserved 0x0  2017-2021 Microchip Technology Inc. DS00002381C-page 57 KSZ8851SNL/SNLI 0x94 – 0x9B: Reserved RX Frame Count & Threshold Register (0x9C – 0x9D): RXFCTR This register indicates the current total amount of received frame count in RXQ frame buffer and also is used to program the received frame count threshold. TABLE 4-50: RX FRAME COUNT & THRESHOLD REGISTER (0X9C – 0X9D) Bit R/W Description Default 15-8 RO RXFC RX Frame Count To indicate the total received frames in RXQ frame buffer when receive interrupt (bit13=1 in ISR) occurred and write “1” to clear this bit 13 in ISR. The host CPU can start to read the updated receive frame header information in RXFHSR/RXFHBCR registers after read this RX frame count register. 0x00 7-0 RW RXFCT Receive Frame Count Threshold To program received frame count threshold value. When bit 5 set to 1 in RXQCR register, the KSZ8851SNL will set RX interrupt (bit 13 in ISR) when the number of received frames in RXQ buffer exceeds the threshold set in this register. 0x00 TX Next Total Frames Size Register (0x9E – 0x9F): TXNTFSR This register is used by the host CPU to program the total amount of TXQ buffer space requested for the next transmit. TABLE 4-51: TX NEXT TOTAL FRAMES SIZE REGISTER (0X9E – 0X9F) Bit R/W Description Default 15-0 RW TXNTFS TX Next Total Frames Size The host CPU is used to program the total amount of TXQ buffer space which is required for next total transmit frames size in double-word count. When bit 1 (TXQ memory available monitor) is set to 1 in TXQCR register, the KSZ8851SNL will generate interrupt (bit 6 in ISR register) to CPU when TXQ memory is available based upon the total amount of TXQ space requested by CPU at this register. 0x0000 MAC Address Hash Table Register 0 (0xA0 – 0xA1): MAHTR0 The 64-bit MAC address table is used for group address filtering and it is enabled by selecting item 5 “Hash perfect” mode the Address Filtering Scheme table. This value is defined as the six most significant bits from CRC circuit calculation result that is based on 48-bit of DA input. The two most significant bits select one of the four registers to be used, while the others determine which bit within the register. Multicast table register 0. TABLE 4-52: MAC ADDRESS HASH TABLE REGISTER 0 (0XA0 – 0XA1) Bit R/W Description 15-0 RW HT0 Hash Table 0 When the appropriate bit is set, if the packet received with DA matches the CRC, the hashing function is received without being filtered. When the appropriate bit is cleared, the packet will drop. DS00002381C-page 58 Default 0x0  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI MAC Address Hash Table Register 1 (0xA2 – 0xA3): MAHTR1 Multicast table register 1. TABLE 4-53: MAC ADDRESS HASH TABLE REGISTER 1 (0XA2 – 0XA3) Bit R/W Description Default 15-0 RW HT1 Hash Table 1 When the appropriate bit is set, if the packet received with DA matches the CRC, the hashing function is received without being filtered. When the appropriate bit is cleared, the packet will drop. Note: When the receive all (RXAE) or receive multicast (RXME) bit is set in the RXCR1, all multicast addresses are received regardless of the multicast table value. 0x0 MAC Address Hash Table Register 2 (0xA4 – 0xA5): MAHTR2 Multicast table register 2. TABLE 4-54: MAC ADDRESS HASH TABLE REGISTER 2 (0XA4 – 0XA5) Bit R/W Description Default 15-0 RW HT2 Hash Table 2 When the appropriate bit is set, if the packet received with DA matches the CRC, the hashing function is received without being filtered. When the appropriate bit is cleared, the packet will drop. Note: When the receive all (RXAE) or receive multicast (RXME) bit is set in the RXCR1, all multicast addresses are received regardless of the multicast table value. 0x0 MAC Address Hash Table Register 3 (0xA6 – 0xA7): MAHTR3 Multicast table register 3. TABLE 4-55: MAC ADDRESS HASH TABLE REGISTER 3 (0XA6 – 0XA7) Bit R/W Description Default 15-0 RW HT3 Hash Table 3 When the appropriate bit is set, if the packet received with DA matches the CRC, the hashing function is received without being filtered. When the appropriate bit is cleared, the packet will drop. Note: When the receive all (RXAE) or receive multicast (RXME) bit is set in the RXCR1, all multicast addresses are received regardless of the multicast table value. 0x0 0xA8 – 0xAF: Reserved Flow Control Low Watermark Register (0xB0 – 0xB1): FCLWR This register is used to control the flow control for low watermark in QMU RX queue. TABLE 4-56: FLOW CONTROL LOW WATERMARK REGISTER (0XB0 – 0XB1) Bit R/W Description 15-12 RW Reserved 11-0 RW FCLWC Flow Control Low Watermark Configuration These bits are used to define the QMU RX queue low watermark configuration. It is in double words count and default is 5.12 KByte available buffer space out of 12 KByte.  2017-2021 Microchip Technology Inc. Default — 0x0500 DS00002381C-page 59 KSZ8851SNL/SNLI Flow Control High Watermark Register (0xB2 – 0xB3): FCHWR This register is used to control the flow control for high watermark in QMU RX queue. TABLE 4-57: Bit FLOW CONTROL HIGH WATERMARK REGISTER (0XB2 – 0XB3) R/W Description Default 15-12 RW Reserved 11-0 RW FCHWC Flow Control High Watermark Configuration These bits are used to define the QMU RX queue high watermark configuration. It is in double words count and default is 3.072 KByte available buffer space out of 12 KByte. — 0x0300 Flow Control Overrun Watermark Register (0xB4 – 0xB5): FCOWR This register is used to control the flow control for overrun watermark in QMU RX queue. TABLE 4-58: FLOW CONTROL OVERRUN WATERMARK REGISTER (0XB4 – 0XB5) Bit R/W Description Default 15-12 RW Reserved 11-0 RW FCLWC Flow Control Overrun Watermark Configuration These bits are used to define the QMU RX queue overrun watermark configuration. It is in double words count and default is 256 Bytes available buffer space out of 12 Kbyte. — 0x0040 0xB6 – 0xBF: Reserved Chip ID and Enable Register (0xC0 – 0xC1): CIDER This register contains the chip ID and the chip enable bit. TABLE 4-59: CHIP ID AND ENABLE REGISTER (0XC0 – 0XC1) Bit R/W Description Default 15-8 RO Family ID Chip family ID 0x88 7-4 RO Chip ID 0x7 is assigned to KSZ8851SNL 0x7 3-1 RO Revision ID 0x1 0 RW Reserved 0x0 0xC2 – 0xC5: Reserved Chip Global Control Register (0xC6 – 0xC7): CGCR This register contains the global control for the chip function. TABLE 4-60: CHIP GLOBAL CONTROL REGISTER (0XC6 – 0XC7) Bit R/W Description Default 15-12 RW Reserved 0x0 11-10 RW Reserved 0x2 LEDSEL0 This bit sets the LEDSEL0 selection for LED1 and LED0. PHY port LED indicators, defined as below: 9 RW — LEDSEL0 0x0 0 1 LED1 (Pin 32) 100BT ACT LED0 (Pin1) LINK/ACT LINK 8 RW Reserved 0x0 7-0 RW Reserved 0x35 DS00002381C-page 60  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI Indirect Access Control Register (0xC8 – 0xC9): IACR This register contains the indirect control for the MIB counter (Write IACR triggers a command. Read access is determined by bit 12). TABLE 4-61: Bit INDIRECT ACCESS CONTROL REGISTER (0XC8 – 0XC9) R/W Description Default 15-13 RW Reserved. 0x0 12 RW Read Enable 1 = Read cycle is enabled (MIB counter will clear after read). 0 = No operation. 0x0 11-10 RW Table Select 00 = reserved. 01 = reserved. 10 = reserved. 11 = MIB counter selected. 0x0 9-5 RW Reserved 4-0 RW Indirect Address Bit 4-0 of indirect address for 32 MIB counter locations. — 0x00 0xCA – 0xCF: Reserved Indirect Access Data Low Register (0xD0 – 0xD1): IADLR This register contains the indirect data (low word) for MIB counter. TABLE 4-62: INDIRECT ACCESS DATA LOW REGISTER (0XD0 – 0XD1) Bit R/W Description Default 15-0 RW Indirect Low Word Data Bit 15-0 of indirect data. 0x0000 Indirect Access Data High Register (0xD2 – 0xD3): IADHR This register contains the indirect data (high word) for MIB counter. TABLE 4-63: INDIRECT ACCESS DATA HIGH REGISTER (0XD2 – 0XD3) Bit R/W Description Default 15-0 RW Indirect High Word Data Bit 31-16 of indirect data. 0x0000 Power Management Event Control Register (0xD4 – 0xD5): PMECR This register is used to control the KSZ8851SNL power management event, capabilities and status. TABLE 4-64: POWER MANAGEMENT EVENT CONTROL REGISTER (0XD4 – 0XD5) Bit R/W Description 15 RO Reserved — 14 RW PME Delay Enable This bit is used to enable the delay of PME output pin 2 assertion. When this bit is set to 1, the device will not assert the PME output till the device’s all clocks are running and ready for host access. When this bit is set to 0, the device will assert the PME output without delay. This bit is only valid when Auto Wake-Up Enable (bit7) is set to 1 in this register. 0 13 RW Reserved 0  2017-2021 Microchip Technology Inc. Default DS00002381C-page 61 KSZ8851SNL/SNLI TABLE 4-64: POWER MANAGEMENT EVENT CONTROL REGISTER (0XD4 – 0XD5) (CONTINUED) Bit R/W Description 12 RW PME Output Polarity This bit is used to control the PME output pin polarity. When this bit is set to 1, the PME output pin is active high. When this bit is set to 0, the PME output pin is active low. 11-8 RW Wake-on-LAN to PME Output Enable These four bits are used to enable the PME output pin asserted when one of these wake-on-LAN events is detected: Bit 11: is corresponding to receive wake-up frame. Bit 10: is corresponding to receive magic packet. Bit 9: is corresponding to link change from down to up. Bit 8: is corresponding to signal energy detected. When the bit is set to 1, the PME pin will be asserted when a corresponding wake-on-LAN event is occurred. When this bit is set to 0, the PME pin will be not asserted when a corresponding wake-on-LAN event is occurred. 0x0 7 RW Auto Wake-Up Enable This bit is used to enable automatically wake-up from low power state to normal power state in energy detect mode if carrier (signal energy) is present more than wake-up time in GSWUTR register. During the normal power state, the device can receive and transmit packets. When this bit is set to 1, the auto wake-up is enabled in energy detect mode. When this bit is set to 0, the auto wake-up is disabled in energy detect mode. 0 6 RW Wake-Up to Normal Operation Mode This bit is used to control the device wake-up from low power state in energy detect mode to normal operation mode if signal energy is detected longer than the programmed wake-up time in GSWUTR register. When this bit is set to 1, the device will automatically go to the normal operation mode from energy detect mode. When this bit is set to 0, the device will not automatically go to the normal mode from energy detect mode. This bit is only valid when Auto Wake-Up Enable (bit7) is set to 1. 0 5-2 RO (W1C) Wake-Up Event Indication These four bits are used to indicate the KSZ8851SNL wake-up event status as below: 0000: No wake-up event. 0001: Wake-up from energy event detected. (Bit 2 also set to 1 in ISR register) 0010: Wake-up from link up event detected. (Bit 3 also set to 1 in ISR register) 0100: Wake-up from magic packet event detected. 1000: Wake-up from wakeup frame event detected. If Wake-on-LAN to PME Output Enable bit[11:8] are set, the KSZ8851SNL also asserts the PME pin. These bits are cleared on power up reset or by write 1. It is not modified by either hardware or software reset. When these bits are cleared, the KSZ8851SNL de-asserts the PME pin. 0x0 DS00002381C-page 62 Default 0  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-64: POWER MANAGEMENT EVENT CONTROL REGISTER (0XD4 – 0XD5) (CONTINUED) Bit R/W Description Default 1-0 RW Power Management Mode These two bits are used to control the KSZ8851SNL power management mode as below: 00: Normal Operation Mode. 01: Energy Detect Mode. (two states in this mode either low power or normal power) 10: Reserved: Should not be used. 11: Power Saving Mode. In energy detect mode under low power state, it can wake-up to normal operation mode either from line or host wake-up (host CPU issues any one of registers read or write access). 0x0 Go-Sleep & Wake-Up Time Register (0xD6 – 0xD7): GSWUTR This register contains the value which is used to control minimum Go-Sleep time period when the device from normal power state to low power state or to control minimum Wake-Up time period when the device from low power state to normal power state in energy detect mode. TABLE 4-65: Bit 15-8 7-0 GO-SLEEP & WAKE-UP TIME REGISTER (0XD6 – 0XD7) R/W Description Default RW Wake-up Time This value is used to control the minimum period that the energy has to be detected consecutively before the device is waked-up from the low power state. The unit is 16 ms ±80%, the default wake-up time is 128 ms (16 ms x 8). Zero time (0x00) is not allowed 0x08 RW Go-sleep Time This value is used to control the minimum period that the no energy event has to be detected consecutively before the device enters the low power state when the energy detect mode is on. The unit is 1 sec ±80%, the default go-sleep time is 12 sec (1s x 12). Zero time (0x00) is not allowed. 0x0C PHY Reset Register (0xD8 – 0xD9): PHYRR This register contains a control bit to reset PHY block when write a “1”. TABLE 4-66: PHY RESET REGISTER (0XD8 – 0XD9) Bit R/W Description 15-1 RW Reserved Default — 0 WO (SC) PHY Reset Bit This bit is write only and self cleared after writing a “1”, it is used to reset PHY block circuitry. 0 0xDA – 0xDF: Reserved 0xE0 – 0xE3: Reserved PHY 1 MII-Register Basic Control Register (0xE4 – 0xE5): P1MBCR This register contains Media Independent Interface (MII) register for port 1 as defined in the IEEE 802.3 specification. TABLE 4-67: PHY 1 MII-REGISTER BASIC CONTROL REGISTER (0XE4 – 0XE5) Bit R/W 15 RO Reserved 0 RW Local (far-end) loopback (llb) 1 = perform local loopback at host (host SPI Tx -> PHY -> host SPI Rx) 0 = normal operation 0 14 Description  2017-2021 Microchip Technology Inc. Default DS00002381C-page 63 KSZ8851SNL/SNLI TABLE 4-67: Bit PHY 1 MII-REGISTER BASIC CONTROL REGISTER (0XE4 – 0XE5) (CONTINUED) R/W Description RW Force 100 1 = force 100 Mbps if AN is disabled (bit 12) 0 = force 10 Mbps if AN is disabled (bit 12) Bit is same as Bit 6 in P1CR. 1 12 RW AN Enable 1 = auto-negotiation enabled. 0 = auto-negotiation disabled. Bit is same as Bit 7 in P1CR. 1 11-10 RW Reserved 0 RW Restart AN 1 = restart auto-negotiation. 0 = normal operation. Bit is same as Bit 13 in P1CR. 0 8 RW Force Full-Duplex 1 = force full-duplex 0 = force half-duplex. if AN is disabled (bit 12) or AN is enabled but failed. Bit is same as Bit 5 in P1CR. 1 7-6 RO Reserved 0 RW HP_mdix 1 = HP Auto MDI-X mode. 0 = Microchip Auto MDI-X mode. Bit is same as Bit 15 in P1SR. 1 RW Force MDI-X 1 = force MDI-X. 0 = normal operation. Bit is same as Bit 9 in P1CR. 0 3 RW Disable MDI-X 1 = disable auto MDI-X. 0 = normal operation. Bit is same as Bit 10 in P1CR. 0 2 RW Reserved 0 RW Disable Transmit 1 = disable transmit. 0 = normal operation. Bit is same as Bit 14 in P1CR. 0 RW Disable LED 1 = disable all LEDs. 0 = normal operation. Bit is same as Bit 15 in P1CR. 0 13 9 5 4 1 0 DS00002381C-page 64 Default  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI PHY 1 MII-Register Basic Status Register (0xE6 – 0xE7): P1MBSR This register contains the MII register status for the chip function. TABLE 4-68: PHY 1 MII-REGISTER BASIC STATUS REGISTER (0XE6 – 0XE7) Bit R/W Description 15 RO T4 Capable 1 = 100BASE-T4 capable. 0 = not 100BASE-T4 capable. 0 14 RO 100 Full Capable 1 = 100BASE-TX full-duplex capable. 0 = not 100BASE-TX full-duplex.capable. 1 13 RO 100 Half Capable 1= 100BASE-TX half-duplex capable. 0= not 100BASE-TX half-duplex capable. 1 12 RO 10 Full Capable 1 = 10BASE-T full-duplex capable. 0 = not 10BASE-T full-duplex capable. 1 11 RO 10 Half Capable 1 = 10BASE-T half-duplex capable. 0 = not 10BASE-T half-duplex capable. 1 10-7 RO Reserved RO Preamble suppressed Not supported. 0 5 RO AN Complete 1 = auto-negotiation complete. 0 = auto-negotiation not completed. Bit is same as Bit 6 in P1SR. 0 4 RO Reserved 0 3 RO AN Capable 1 = auto-negotiation capable. 0 = not auto-negotiation capable. 1 2 RO Link Status 1 = link is up; 0 = link is down. Bit is same as Bit 5 in P1SR. 0 1 RO Jabber test Not supported. 0 0 RO Extended Capable 1 = extended register capable. 0 = not extended register capable. 0 6 Default 0x0 PHY 1 PHY ID Low Register (0xE8 – 0xE9): PHY1ILR This register contains the PHY ID (low) for the chip. TABLE 4-69: PHY 1 PHY ID LOW REGISTER (0XE8 – 0XE9) Bit R/W Description Default 15-0 RO PHYID Low Low order PHYID bits. 0x1430 PHY 1 PHY ID High Register (0xEA – 0xEB): PHY1IHR This register contains the PHY ID (high) for the chip. TABLE 4-70: PHY 1 PHY ID HIGH REGISTER (0XEA – 0XEB) Bit R/W Description Default 15-0 RO PHYID High High order PHYID bits. 0x0022  2017-2021 Microchip Technology Inc. DS00002381C-page 65 KSZ8851SNL/SNLI PHY 1 Auto-Negotiation Advertisement Register (0xEC – 0xED): P1ANAR This register contains the auto-negotiation advertisement for the PHY function. TABLE 4-71: PHY 1 AUTO-NEGOTIATION ADVERTISEMENT REGISTER (0XEC – 0XED) Bit R/W Description 15 RO Next page Not supported. 0 14 RO Reserved 0 13 RO Remote fault Not supported. 0 12-11 RO Reserved 10 RW Pause (flow control capability) 1 = advertise pause capability. 0 = do not advertise pause capability. Bit is same as Bit 4 in P1CR. 1 9 RW Reserved 0 RW Adv 100 Full 1 = advertise 100 full-duplex capability. 0 = do not advertise 100 full-duplex capability Bit is same as Bit 3 in P1CR. 1 RW Adv 100 Half 1= advertise 100 half-duplex capability. 0 = do not advertise 100 half-duplex capability. Bit is same as Bit 2 in P1CR. 1 RW Adv 10 Full 1 = advertise 10 full-duplex capability. 0 = do not advertise 10 full-duplex capability. Bit is same as Bit 1 in P1CR. 1 5 RW Adv 10 Half 1 = advertise 10 half-duplex capability. 0 = do not advertise 10 half-duplex capability. Bit is same as Bit 0 in P1CR. 1 4-0 RO Selector Field 802.3 8 7 6 Default 0x0 0x01 PHY 1 Auto-Negotiation Link Partner Ability Register (0xEE – 0xEF): P1ANLPR This register contains the auto-negotiation link partner ability for the chip function. TABLE 4-72: PHY 1 AUTO-NEGOTIATION LINK PARTNER ABILITY REGISTER (0XEE – 0XEF) Bit R/W Description 15 RO Next page Not supported. 0 14 RO LP ACK Not supported. 0 13 RO Remote fault Not supported. 0 12-11 RO Reserved 10 RO Pause Link partner pause capability. Bit is same as Bit 4 in P1SR. 0 9 RO Reserved 0 DS00002381C-page 66 Default 0x0  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-72: PHY 1 AUTO-NEGOTIATION LINK PARTNER ABILITY REGISTER (0XEE – 0XEF) Bit R/W Description Default 8 RO Adv 100 Full Link partner 100 full capability. Bit is same as Bit 3 in P1SR. 0 7 RO Adv 100 Half Link partner 100 half capability. Bit is same as Bit 2 in P1SR. 0 6 RO Adv 10 Full Link partner 10 full capability. Bit is same as Bit 1 in P1SR. 0 5 RO Adv 10 Half Link partner 10 half capability. Bit is same as Bit 0 in P1SR. 0 4-0 RO Reserved 0x01 0xF0 – 0xF3: Reserved Port 1 PHY Special Control/Status, LinkMD (0xF4 – 0xF5): P1SCLMD This register contains the special control, status and LinkMD information of PHY1. TABLE 4-73: PORT 1 PHY SPECIAL CONTROL/STATUS, LINKMD (0XF4 – 0XF5) Bit R/W Description 15 RO Reserved RO Vct_result VCT result. [00] = normal condition. [01] = open condition has been detected in cable. [10] = short condition has been detected in cable. [11] = cable diagnostic test has failed. 14-13 Default 0 0x0 Vct_en Vct enable. 1 = the cable diagnostic test is enabled. It is self-cleared after the VCT test is done. 0 = it indicates the cable diagnostic test is completed and the status information is valid for read. 0 12 RW (SC) 11 RW Force_lnk Force link. 1 = force link pass; 0 = normal operation. 0 10 RO Reserved 0 9 RW Remote (Near-end) loopback (rlb) 1 = perform remote loopback at PHY (RXP/RXM -> TXP/TXM) 0 = normal operation 0 8-0 RO Vct_fault_count VCT fault count. Distance to the fault. It’s approximately 0.4m*vct_fault_count. 0x000  2017-2021 Microchip Technology Inc. DS00002381C-page 67 KSZ8851SNL/SNLI Port 1 Control Register (0xF6 – 0xF7): P1CR This register contains the global per port control for the chip function. TABLE 4-74: Bit 15 14 13 PORT 1 CONTROL REGISTER (0XF6 – 0XF7) R/W Description Default RW LED Off 1 = Turn off all of the port 1 LEDs (P1LED3, P1LED2, P1LED1, P1LED0). These pins are driven high if this bit is set to one. 0 = normal operation. Bit is same as Bit 0 in P1MBCR. 0 RW Txids 1 = disable the port’s transmitter. 0 = normal operation. Bit is same as Bit 1 in P1MBCR. 0 RW Restart AN 1 = restart auto-negotiation. 0 = normal operation. Bit is same as Bit 9 in P1MBCR. 0 12 RW Reserved 0 11 RW Reserved 0 RW Disable auto MDI/MDI-X 1 = disable auto MDI/MDI-X function. 0 = enable auto MDI/MDI-X function. Bit is same as Bit 3 in P1MBCR. 0 9 RW Force MDI-X 1= if auto MDI/MDI-X is disabled, force PHY into MDI-X mode. 0 = do not force PHY into MDI-X mode. Bit is same as Bit 4 in P1MBCR. 0 8 RW Reserved 0 RW Auto Negotiation Enable 1 = auto negotiation is enabled. 0 = disable auto negotiation, speed, and duplex are decided by bits 6 and 5 of the same register. Bit is same as Bit 12 in P1MBCR. 1 RW Force Speed 1 = force 100BT if AN is disabled (bit 7). 0 = force 10BT if AN is disabled (bit 7). Bit is same as Bit 13 in P1MBCR. 1 RW Force Duplex 1 = force full duplex if (1) AN is disabled or (2) AN is enabled but failed. 0 = force half duplex if (1) AN is disabled or (2) AN is enabled but failed. Bit is same as Bit 8 in P1MBCR. 1 RW Advertised flow control capability. 1 = advertise flow control (pause) capability. 0 = suppress flow control (pause) capability from transmission to link partner. Bit is same as Bit 10 in P1ANAR. 1 RW Advertised 100BT full-duplex capability. 1 = advertise 100BT full-duplex capability. 0 = suppress 100BT full-duplex capability from transmission to link partner. Bit is same as Bit 8 in P1ANAR. 1 10 7 6 5 4 3 DS00002381C-page 68  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-74: Bit 2 1 0 PORT 1 CONTROL REGISTER (0XF6 – 0XF7) (CONTINUED) R/W Description Default RW Advertised 100BT half-duplex capability. 1 = advertise 100BT half-duplex capability. 0 = suppress 100BT half-duplex capability from transmission to link partner. Bit is same as Bit 7 in P1ANAR. 1 RW Advertised 10BT full-duplex capability. 1 = advertise 10BT full-duplex capability. 0 = suppress 10BT full-duplex capability from transmission to link partner. Bit is same as Bit 6 in P1ANAR. 1 RW Advertised 10BT half-duplex capability. 1 = advertise 10BT half-duplex capability. 0 = suppress 10BT half-duplex capability from transmission to link partner. Bit is same as Bit 5 in P1ANAR. 1 Port 1 Status Register (0xF8 – 0xF9): P1SR This register contains the PHY port status for the chip function. TABLE 4-75: Bit PORT 1 STATUS REGISTER (0XF8 – 0XF9) R/W Description 15 RW HP_mdix 1 = HP Auto MDI-X mode. 0 = Microchip Auto MDI-X mode. Bit is same as Bit 5 in P1MBCR. 1 14 RO Reserved 0 13 RO Polarity Reverse 1 = polarity is reversed. 0 = polarity is not reversed. 0 12-11 RO Reserved 0 10 RO Operation Speed 1 = link speed is 100 Mbps. 0 = link speed is 10 Mbps. 0 9 RO Operation Duplex 1 = link duplex is full. 0 = link duplex is half. 0 8 RO Reserved 0 7 RO MDI-X status 1 = MDI. 0 = MDI-X. 1 RO AN Done 1 = AN done. 0 = AN not done. Bit is same as Bit 5 in P1MBSR. 0 RO Link Good 1= link good. 0 = link not good. Bit is same as Bit 2 in P1MBSR. 0 RO Partner flow control capability. 1 = link partner flow control (pause) capable. 0 = link partner not flow control (pause) capable. Bit it same as Bit 10 in P1ANLPR. 0 6 5 4  2017-2021 Microchip Technology Inc. Default DS00002381C-page 69 KSZ8851SNL/SNLI TABLE 4-75: Bit 3 2 1 0 PORT 1 STATUS REGISTER (0XF8 – 0XF9) (CONTINUED) R/W Description Default RO Partner 100BT full-duplex capability. 1 = link partner 100BT full-duplex capable. 0 = link partner not 100BT full-duplex capable. Bit is same as Bit 8 in P1ANLPR. 0 RO Partner 100BT half-duplex capability. 1 = link partner 100BT half-duplex capable. 0= link partner not 100BT half-duplex capable. Bit is same as Bit 7 in P1ANLPR. 0 RO Partner 10BT full-duplex capability. 1= link partner 10BT full-duplex capable. 0 = link partner not 10BT full-duplex capable. Bit is same as Bit 6 in P1ANLPR. 0 RO Partner 10BT half-duplex capability. 1 = link partner 10BT half-duplex capable. 0 = link partner not 10BT half-duplex capable. Bit is same as Bit 5 in P1ANLPR. 0 0xFA – 0xFF: Reserved 4.3 Management Information Base (MIB) Counters The KSZ8851SNL provides 32 MIB counters to monitor the port activity for network management. The MIB counters are formatted as shown below. TABLE 4-76: Bit 31-0 FORMAT OF MIB COUNTERS Name R/W Description Counter Values RO Counter value (read clear) Default 0x00000000 Ethernet port MIB counters are read using indirect memory access. The address offset range is 0x00 to 0x1F. TABLE 4-77: Offset 0x0 PORT 1 MIB COUNTERS INDIRECT MEMORY OFFSETS Counter Name Description RxByte Rx octet count including bad packets 0x1 Reserved Reserved 0x2 RxUndersizePkt Rx undersize packets w/ good CRC 0x3 RxFragments Rx fragment packets w/ bad CRC, symbol errors or alignment errors 0x4 RxOversize Rx oversize packets w/ good CRC (max: 1536 bytes) 0x5 RxJabbers Rx packets longer than 1536 bytes w/ either CRC errors, alignment errors, or symbol errors 0x6 RxSymbolError Rx packets w/ invalid data symbol and legal packet size. 0x7 RxCRCError Rx packets within (64,2000) bytes w/ an integral number of bytes and a bad CRC 0x8 RxAlignmentError Rx packets within (64,2000) bytes w/ a non-integral number of bytes and a bad CRC 0x9 RxControl8808Pkts Number of MAC control frames received by a port with 88-08h in EtherType field 0xA RxPausePkts Number of PAUSE frames received by a port. PAUSE frame is qualified with EtherType (88-08h), DA, control opcode (00-01), data length (64B min), and a valid CRC 0xB RxBroadcast Rx good broadcast packets (not including error broadcast packets or valid multicast packets) DS00002381C-page 70  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI TABLE 4-77: Offset PORT 1 MIB COUNTERS INDIRECT MEMORY OFFSETS (CONTINUED) Counter Name Description 0xC RxMulticast Rx good multicast packets (not including MAC control frames, error multicast packets or valid broadcast packets) 0xD RxUnicast Rx good unicast packets 0xE Rx64Octets Total Rx packets (bad packets included) that were 64 octets in length 0xF Rx65to127Octets Total Rx packets (bad packets included) that are between 65 and 127 octets in length 0x10 Rx128to255Octets Total Rx packets (bad packets included) that are between 128 and 255 octets in length 0x11 Rx256to511Octets Total Rx packets (bad packets included) that are between 256 and 511 octets in length 0x12 Rx512to1023Octets Total Rx packets (bad packets included) that are between 512 and 1023 octets in length 0x13 Rx1024to1521Octets Total Rx packets (bad packets included) that are between 1024 and 1521 octets in length 0x14 Rx1522to2000Octets Total Rx packets (bad packets included) that are between 1522 and 2000 octets in length 0x15 TxByte Tx good octet count, including PAUSE packets 0x16 TxLateCollision The number of times a collision is detected later than 512 bit-times into the Tx of a packet 0x17 TxPausePkts Number of PAUSE frames transmitted by a port 0x18 TxBroadcastPkts Tx good broadcast packets (not including error broadcast or valid multicast packets) 0x19 TxMulticastPkts Tx good multicast packets (not including error multicast packets or valid broadcast packets) 0x1A TxUnicastPkts Tx good unicast packets 0x1B TxDeferred Tx packets by a port for which the 1st Tx attempt is delayed due to the busy medium 0x1C TxTotalCollision Tx total collision, half duplex only 0x1D TxExcessiveCollision A count of frames for which Tx fails due to excessive collisions 0x1E TxSingleCollision Successfully Tx frames on a port for which Tx is inhibited by exactly one collision 0x1F TxMultipleCollision Successfully Tx frames on a port for which Tx is inhibited by more than one collision Examples: 1. MIB Counter Read (read port 1 “Rx64Octets” counter at indirect address offset 0x0E) Write to reg. IACR (0xC8) with 0x1C0E (set indirect address and trigger a read MIB counters operation) Then Read reg. IADHR (MIB counter value 31-16) Read reg. IADLR (MIB counter value 15-0) 4.3.1 ADDITIONAL MIB COUNTER INFORMATION In the heaviest condition, the byte counter will overflow in 2 minutes. It is recommended that the software read all the counters at least every 30 seconds. MIB counters are designed as “read clear”. That is, these counters will be cleared after they are read.  2017-2021 Microchip Technology Inc. DS00002381C-page 71 KSZ8851SNL/SNLI 5.0 OPERATIONAL CHARACTERISTICS 5.1 Absolute Maximum Ratings* Supply Voltage (VDDA_3.3, VDD_IO)............................................................................................................ –0.5V to +4.0V Input Voltage (All Inputs) ........................................................................................................................... –0.5V to +4.0V Output Voltage (All Outputs) ..................................................................................................................... –0.5V to +4.0V Lead Temperature (soldering, 10s) ....................................................................................................................... +260°C Storage Temperature (TS) ...................................................................................................................... –65°C to +150°C Maximum Junction Temperature (TJ) .................................................................................................................... +125°C HBM ESD Rating......................................................................................................................................................±6 kV *Exceeding the absolute maximum rating may damage the device. Stresses greater than the absolute maximum rating may cause permanent damage to the device. Operation of the device at these or any other conditions above those specified in the operating sections of this specification is not implied. Maximum conditions for extended periods may affect reliability. 5.2 Operating Ratings** Supply Voltage (VDDA_3.3).................................................................................................................................................. +3.1V to +3.5V (VDD_IO 3.3V) ............................................................................................................................................ +3.1V to +3.5V (VDD_IO 2.5V) ........................................................................................................................................ +2.35V to +2.65V (VDD_IO 1.8V) ............................................................................................................................................ +1.7V to +1.9V Ambient Operating Temperature (TA) (Commercial, SNL).......................................................................................................................................0°C to +70°C (Industrial, SNLI) ...................................................................................................................................... –40°C to +85°C Thermal Resistance Junction-to-Ambient (Note 5-1) (ΘJA)................................................................................................................. +34°C/W Junction-to-Case (Note 5-1) (ΘJC) ....................................................................................................................... +6°C/W **The device is not guaranteed to function outside its operating ratings. Unused inputs must always be tied to a appropriate logic voltage level (Ground to VDD_IO). Note 5-1 Note: No heat spreader (HS) in this package. Do not drive input signals without power supplied to the device. DS00002381C-page 72  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 6.0 ELECTRICAL CHARACTERISTICS TA = 25°C. Specification is for packaged product only. Single port’s transformer consumes an additional 45 mA @ 3.3V for 100BASE-TX and 70 mA @ 3.3V for 10BASE-T. TABLE 6-1: ELECTRICAL CHARACTERISTICS Parameters Symbol Min. Typ. Max. Units Note Supply Current for 100BASE-TX Operation (Single Port @ 100% Utilization) 100BASE-TX (analog core + PLL + digital core + transceiver + digital I/O) IDD1 — 85 — — 85 — — 85 — VDD_A3.3, VDD_IO = 3.3V; Chip only (no transformer) mA VDD_A3.3 = 3.3V, VDD_IO = 2.5V; Chip only (no transformer) VDD_A3.3 = 3.3V, VDD_IO = 1.8V; Chip only (no transformer) Supply Current for 10BASE-T Operation (Single Port @ 100% Utilization) 10BASE-T (analog core + PLL + digital core + transceiver + digital I/O) IDD2 — 75 — — 75 — — 75 — VDD_A3.3, VDD_IO = 3.3V; Chip only (no transformer) mA VDD_A3.3 = 3.3V, VDD_IO = 2.5V; Chip only (no transformer) VDD_A3.3 = 3.3V, VDD_IO = 1.8V; Chip only (no transformer) Power Management Mode Power Saving Mode (Note 6-1) IDD3 — 70 — mA Ethernet cable disconnected and Auto-Negotiation Energy Detect Mode IDD5 — 2 — mA At low power state TTL Inputs (VDD_IO = 3.3V/2.5V/1.8V) Input High Voltage VIH 2.0/2.0/ 1.3 — — V — Input Low Voltage VIL — — 0.8/0.6/ 0.3 V — Input Current IIN –10 — 10 µA VIN = GND ~ VDDIO TTL Outputs (VDD_IO = 3.3V/2.5V/1.8V) Output High Voltage VOH 2.4/1.9/ 1.5 — — V IOH = –8 mA Output Low Voltage VOL — — 0.4/0.4/ 0.2 V IOL = 8 mA Output Tri-State Leakage |IOZ| — — 10 µA — 100BASE-TX Transmit (measured differentially after 1:1 transformer) Peak Differential Output Voltage VO ±0.95 — ±1.05 V 100Ω termination across differential output Output Voltage Imbalance VIMB — — 2 % 100Ω termination across differential output Rise/Fall Time tr/tf 3 — 5 ns — Rise/Fall Time Imbalance — 0 — 0.5 ns — Duty Cycle Distortion — — — ±0.25 ns — Overshoot — — — 5 % — Reference Voltage of ISET VSET — 0.5 — V — Output Jitter — — 0.7 1.4 ns Peak-to-peak VSQ — 400 — mV 5 MHz square wave 10BASE-T Receive Squelch Threshold  2017-2021 Microchip Technology Inc. DS00002381C-page 73 KSZ8851SNL/SNLI TABLE 6-1: ELECTRICAL CHARACTERISTICS (CONTINUED) Parameters Symbol Min. Typ. Max. Units Note 10BASE-T Transmit (measured differentially after 1:1 transformer) Peak Differential Output Voltage VP 2.2 2.5 2.8 V 100Ω termination on the differential output Jitter Added — — 1.8 3.5 ns 100Ω termination on the differential output (peak-to-peak) Note 6-1 Single port’s transformer consumes less than 1 mA during Power Saving Mode. DS00002381C-page 74  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 7.0 TIMING SPECIFICATIONS 7.1 SPI Input and Output Timing FIGURE 7-1: SPI INTERFACE DATA INPUT TIMING CSN t1 t5 t4 1/fSCLK SCLK t2 t3 LSB bit MSB bit SI High Impedance SO FIGURE 7-2: SPI INTERFACE DATA OUTPUT TIMING CSN t5 1/fSCLK SCLK t6 TABLE 7-1: LSB bit MSB bit SO SI t7 LSB in Don’t Care SPI DATA INPUT & OUTPUT TIMING PARAMETERS Symbol Parameter fSCLK SPI Clock Frequency t1 CSN active setup time t2 t3 Min. Typ. Max. Units — — 40 MHz 8 — — ns SI data input setup time 3 — — ns SI data input hold time 3 — — ns t4 CSN active hold time 8 — — ns t5 CSN disable high time 8 — — ns t6 SCLK falling edge to SO data output valid (Note 7-1) 7.5 — 9 ns 1 ns t7 Note 7-1 CSN inactive to SO data output valid — — The last SI data falling edge of SCLK starts output data on SO from KSZ8851SNL.  2017-2021 Microchip Technology Inc. DS00002381C-page 75 KSZ8851SNL/SNLI 7.2 Auto Negotiation Timing FIGURE 7-3: AUTO NEGOTIATION TIMING FLP BURST FLP BURST TX+/TX– tFLPWW tBTB TX+/TX– CLOCK PULSE DATA PULSE tPWW tPWW CLOCK PULSE DATA PULSE tCTC tCTC TABLE 7-2: AUTO NEGOTIATION TIMING PARAMETERS Parameter Description Min. Typ. Max. Units tBTB FLP burst to FLP burst 8 16 24 ms tFLPW FLP burst width — 2 — ms tPW Clock/data pulse width — 100 — ns tCTD Clock pulse to data pulse 55.5 64 69.5 µs tCTC Clock pulse to clock pulse 111 128 139 µs — Number of clock/data pulses per burst 17 — 33 — DS00002381C-page 76  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 7.3 Reset Timing As long as the stable supply voltages to reset High timing (minimum of 10 ms) are met, there is no power-sequencing requirement for the KSZ8851SNL supply voltages (3.3V). The reset timing requirement is summarized in Figure 7-4 and Table 7-3. FIGURE 7-4: RESET TIMING SUPPLY VOLTAGE tsr RSTN TABLE 7-3: RESET TIMING PARAMETERS Parameter Description tSR Stable supply voltages to reset High  2017-2021 Microchip Technology Inc. Min. Typ. Max. Units 10 — — ms DS00002381C-page 77 KSZ8851SNL/SNLI 7.4 EEPROM Timing FIGURE 7-5: EEPROM READ CYCLE TIMING DIAGRAM EECS *1 1 EESK tcyc EED_IO (OUTPUT) 11 0 AN A0 ts th HIGH -Z EED_IO (INPUT ) D15 D14 D0 D1 D13 *1 START BIT TABLE 7-4: EEPROM TIMING PARAMETERS Parameter Description Min. Typ. tCYC ts th Clock cycle; (OBCR[1:0]=00 on-chip bus speed @ 125 MHz) — Setup time 20 Hold time 20 DS00002381C-page 78 Max. Units 0.8 — µs — — ns — — ns  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI 8.0 SELECTION OF ISOLATION TRANSFORMERS A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode choke is recommended for exceeding FCC requirements. Table 8-1 lists recommended transformer characteristics. TABLE 8-1: TRANSFORMER SELECTION CRITERIA Parameter Value Test Conditions Turns Ratio 1 CT : 1 CT — Open-Circuit Inductance (min.) 350 µH 100 mV, 100 kHz, 8 mA Leakage Inductance (max.) 0.4 µH 1 MHz (min.) Interwinding Capacitance (max.) 12 pF — D.C. Resistance (max.) 0.9Ω — Insertion Loss (max.) 1.0 dB 0 MHz to 65 MHz HIPOT (min.) 1500 VRMS — TABLE 8-2: QUALIFIED SINGLE-PORT MAGNETICS Manufacturer Part Number Auto MDI-X Pulse H1102 Yes Pulse (low cost) H1260 Yes Transpower HB726 Yes Bel Fuse S558-5999-U7 Yes Delta LF8505 Yes LanKom LF-H41S Yes TDK (Mag Jack) TLA-6T718 Yes TABLE 8-3: TYPICAL REFERENCE CRYSTAL CHARACTERISTICS Characteristic Value Frequency 25 MHz Frequency Tolerance (max.) ±50 ppm Load Capacitance (max.) 20 pF Series Resistance 40Ω  2017-2021 Microchip Technology Inc. DS00002381C-page 79 KSZ8851SNL/SNLI 9.0 PACKAGE OUTLINE FIGURE 9-1: DS00002381C-page 80 32-LEAD QFN 5 MM X 5 MM PACKAGE OUTLINE & RECOMMENDED LAND PATTERN  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI APPENDIX A: TABLE A-1: DATA SHEET REVISION HISTORY REVISION HISTORY Revision Section/Figure/Entry Correction DS00002381A (03-27-17) — Converted Micrel data sheet KSZ8851SNL/SNLI to Microchip DS00002381A. Minor text changes throughout. DS00002381B (06-08-18) • Power Modes, Power Supplies, and Packaging • Functional Overview: Power Management • Table 3-1 • Table 4-64 • Table 6-1 References to Soft Power Down mode removed and/ or changed to “Reserved.” DS00002381C (06-22-21) • Figure 9-1 Updated package drawing.  2017-2021 Microchip Technology Inc. DS00002381C-page 81 KSZ8851SNL/SNLI THE MICROCHIP WEB SITE Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information: • Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s guides and hardware support documents, latest software releases and archived software • General Technical Support – Frequently Asked Questions (FAQ), technical support requests, online discussion groups, Microchip consultant program member listing • Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives CUSTOMER CHANGE NOTIFICATION SERVICE Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. To register, access the Microchip web site at www.microchip.com. Under “Support”, click on “Customer Change Notification” and follow the registration instructions. CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels: • • • • Distributor or Representative Local Sales Office Field Application Engineer (FAE) Technical Support Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://microchip.com/support DS00002381C-page 82  2017-2021 Microchip Technology Inc. KSZ8851SNL/SNLI PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. Examples: XX PART NO. X X X X a) KSZ8851SNL Device Interface Package Supply Temperature Media Type Voltage Device: KSZ8851 Interface: S = SPI Interface Package: N = 32-lead QFN Supply Voltage: L = Single 3.3V Supply Temperature: blank = 0C to +70C (Commercial) I = –40C to +85C (Industrial) Media Type: blank = Tray TR = Tape & Reel  2017-2021 Microchip Technology Inc. b) c) d) SPI Interface 32-lead QFN Single 3.3V Supply Commercial Temperature Tray KSZ8851SNLI SPI Interface 32-lead QFN Single 3.3V Supply Industrial Temperature Tray KSZ8851SNL-TR SPI Interface 32-lead QFN Single 3.3V Supply Commercial Temperature Tape & Reel KSZ8851SNLI-TR SPI Interface 32-lead QFN Single 3.3V Supply Industrial Temperature Tape & Reel DS00002381C-page 83 KSZ8851SNL/SNLI NOTES: DS00002381C-page 84  2017-2021 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specifications contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is secure when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods being used in attempts to breach the code protection features of the Microchip devices. We believe that these methods require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Attempts to breach these code protection features, most likely, cannot be accomplished without violating Microchip's intellectual property rights. • Microchip is willing to work with any customer who is concerned about the integrity of its code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not mean that we are guaranteeing the product is "unbreakable." Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication is provided for the sole purpose of designing with and using Microchip products. Information regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. THIS INFORMATION IS PROVIDED BY MICROCHIP "AS IS". MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE OR WARRANTIES RELATED TO ITS CONDITION, QUALITY, OR PERFORMANCE. IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE INFORMATION OR ITS USE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY RELATED TO THE INFORMATION OR ITS USE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THE INFORMATION. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated. Trademarks The Microchip name and logo, the Microchip logo, Adaptec, AnyRate, AVR, AVR logo, AVR Freaks, BesTime, BitCloud, chipKIT, chipKIT logo, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, HELDO, IGLOO, JukeBlox, KeeLoq, Kleer, LANCheck, LinkMD, maXStylus, maXTouch, MediaLB, megaAVR, Microsemi, Microsemi logo, MOST, MOST logo, MPLAB, OptoLyzer, PackeTime, PIC, picoPower, PICSTART, PIC32 logo, PolarFire, Prochip Designer, QTouch, SAM-BA, SenGenuity, SpyNIC, SST, SST Logo, SuperFlash, Symmetricom, SyncServer, Tachyon, TimeSource, tinyAVR, UNI/O, Vectron, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AgileSwitch, APT, ClockWorks, The Embedded Control Solutions Company, EtherSynch, FlashTec, Hyper Speed Control, HyperLight Load, IntelliMOS, Libero, motorBench, mTouch, Powermite 3, Precision Edge, ProASIC, ProASIC Plus, ProASIC Plus logo, Quiet-Wire, SmartFusion, SyncWorld, Temux, TimeCesium, TimeHub, TimePictra, TimeProvider, WinPath, and ZL are registered trademarks of Microchip Technology Incorporated in the U.S.A. Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, Augmented Switching, BlueSky, BodyCom, CodeGuard, CryptoAuthentication, CryptoAutomotive, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, Espresso T1S, EtherGREEN, IdealBridge, In-Circuit Serial Programming, ICSP, INICnet, Intelligent Paralleling, Inter-Chip Connectivity, JitterBlocker, maxCrypto, maxView, memBrain, Mindi, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PowerSmart, PureSilicon, QMatrix, REAL ICE, Ripple Blocker, RTAX, RTG4, SAM-ICE, Serial Quad I/O, simpleMAP, SimpliPHY, SmartBuffer, SMART-I.S., storClad, SQI, SuperSwitcher, SuperSwitcher II, Switchtec, SynchroPHY, Total Endurance, TSHARC, USBCheck, VariSense, VectorBlox, VeriPHY, ViewSpan, WiperLock, XpressConnect, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. The Adaptec logo, Frequency on Demand, Silicon Storage Technology, and Symmcom are registered trademarks of Microchip Technology Inc. in other countries. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. © 2017-2021, Microchip Technology Incorporated, All Rights Reserved. ISBN: 978-1-5224-8415-8 For information regarding Microchip’s Quality Management Systems, please visit www.microchip.com/quality.  2017-2021 Microchip Technology Inc. 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