KSZ8041NLJ 10/100 Ethernet Transceiver with Extended Temperature Support Data Sheet Rev. 1.0 General Description The KSZ8041NLJ is the industrial version of the KSZ8041NL that operates over the extended temperature o o range of -40 C to +125 C. It is a single-supply 10BaseT/100Base-TX Physical Layer Transceiver, which provides MII/RMII interfaces to transmit and receive data and uses a unique mixed signal design to extend signaling distance while reducing power consumption. The KSZ8041NLJ operates in extremely high temperature o (+125 C) environments without degrading performance, and requires no heat sink to save system Bill of Materials (BOM) cost and reduce board stack-up. The KSZ8041NLJ supports HP Auto MDI/MDI-X to provide the most robust solution for eliminating the need to differentiate between crossover and straight-through cables. Combined with low power and high performance, the KSZ8041NLJ is an ideal physical layer transceiver for 10Base-T/100Base-TX industrial, automotive and military applications. ® The KSZ8041NLJ comes in a 32-pin, lead-free MLF (QFN per JDEC) package (See Ordering Information). Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Functional Diagram April 2010 1 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Features Applications • Single-chip 10Base-T/100Base-TX physical layer solution • Fully compliant to IEEE 802.3u Standard • Low power CMOS design, power consumption of <180mW • HP auto MDI/MDI-X for reliable detection and correction for straight-through and crossover cables with disable and enable option • Robust operation over standard cables • Power down and power saving modes • MII interface support • RMII interface support with external 50MHz system clock • MIIM (MDC/MDIO) management bus to 6.25MHz for rapid PHY register configuration • Interrupt pin option • Programmable LED outputs for link, activity and speed • ESD rating (6kV) • Single power supply (3.3V) • Built-in 1.8V regulator for core o o • Extended temperature support (-40 C to +125 C) ® • Available in 32-pin (5mm x 5mm) MLF package • Industrial Control • Automotive • Military Communication System Ordering Information Part Number KSZ8041NLJ (1) Temp. Range -40°C to 125°C Package 32-Pin MLF ® Lead Finish Description Pb-Free Extended High Temperature Device Note: 1. Contact factory for lead time. Revision History Revision Date Summary of Changes 1.0 3/30/10 Data sheet created. April 2010 2 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Contents Pin Configuration .................................................................................................................................................................. 6 Pin Description ...................................................................................................................................................................... 7 Strapping Options ............................................................................................................................................................... 10 Functional Description ....................................................................................................................................................... 11 100Base-TX Transmit....................................................................................................................................................... 11 100Base-TX Receive........................................................................................................................................................ 11 PLL Clock Synthesizer...................................................................................................................................................... 11 Scrambler/De-scrambler (100Base-TX only).................................................................................................................... 11 10Base-T Transmit ........................................................................................................................................................... 11 10Base-T Receive ............................................................................................................................................................ 11 SQE and Jabber Function (10Base-T only)...................................................................................................................... 12 Auto-Negotiation ............................................................................................................................................................... 12 MII Management (MIIM) Interface .................................................................................................................................... 14 Interrupt (INTRP) .............................................................................................................................................................. 14 MII Data Interface ............................................................................................................................................................. 14 MII Signal Definition.......................................................................................................................................................... 15 Transmit Clock (TXC) ................................................................................................................................................... 15 Transmit Enable (TXEN) .............................................................................................................................................. 15 Transmit Data [3:0] (TXD[3:0]) ..................................................................................................................................... 15 Receive Clock (RXC).................................................................................................................................................... 15 Receive Data Valid (RXDV).......................................................................................................................................... 16 Receive Data [3:0] (RXD[3:0]) ...................................................................................................................................... 16 Receive Error (RXER) .................................................................................................................................................. 16 Carrier Sense (CRS) .................................................................................................................................................... 16 Collision (COL) ............................................................................................................................................................. 16 Reduced MII (RMII) Data Interface................................................................................................................................... 16 RMII Signal Definition ....................................................................................................................................................... 17 Reference Clock (REF_CLK) ....................................................................................................................................... 17 Transmit Enable (TX_EN) ............................................................................................................................................ 17 Transmit Data [1:0] (TXD[1:0]) ..................................................................................................................................... 17 Carrier Sense/Receive Data Valid (CRS_DV).............................................................................................................. 17 Receive Data [1:0] (RXD[1:0]) ...................................................................................................................................... 17 Receive Error (RX_ER) ................................................................................................................................................ 17 Collision Detection ........................................................................................................................................................ 18 HP Auto MDI/MDI-X.......................................................................................................................................................... 18 Straight Cable ............................................................................................................................................................... 18 Crossover Cable ........................................................................................................................................................... 19 Power Management.......................................................................................................................................................... 20 Power Saving Mode ..................................................................................................................................................... 20 Power Down Mode ....................................................................................................................................................... 20 Reference Clock Connection Options .............................................................................................................................. 20 April 2010 3 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Reference Circuit for Power and Ground Connections .................................................................................................... 21 Register Map........................................................................................................................................................................ 22 Register Description ........................................................................................................................................................... 22 (1) Absolute Maximum Ratings ............................................................................................................................................ 29 (2) Operating Ratings ............................................................................................................................................................ 29 Electrical Characteristics ................................................................................................................................................... 29 Timing Diagrams ................................................................................................................................................................. 31 MII SQE Timing (10Base-T) ............................................................................................................................................. 31 MII Transmit Timing (10Base-T) ....................................................................................................................................... 32 MII Receive Timing (10Base-T) ........................................................................................................................................ 33 MII Transmit Timing (100Base-TX) .................................................................................................................................. 34 MII Receive Timing (100Base-TX) ................................................................................................................................... 35 RMII Timing....................................................................................................................................................................... 36 Auto-Negotiation Timing ................................................................................................................................................... 37 MDC/MDIO Timing ........................................................................................................................................................... 38 Reset Timing..................................................................................................................................................................... 39 Reset Circuit ........................................................................................................................................................................ 40 Reference Circuits for LED Strapping Pins...................................................................................................................... 41 Selection of Isolation Transformer.................................................................................................................................... 42 Selection of Reference Crystal .......................................................................................................................................... 42 Package Information ........................................................................................................................................................... 43 April 2010 4 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ List of Figures Figure 1. Auto-Negotiation Flow Chart................................................................................................................................. 13 Figure 2. Typical Straight Cable Connection ....................................................................................................................... 18 Figure 3. Typical Crossover Cable Connection ................................................................................................................... 19 Figure 4. 25MHz Crystal / Oscillator Reference Clock for MII Mode ................................................................................... 20 Figure 5. 50MHz Oscillator Reference Clock for RMII Mode............................................................................................... 20 Figure 6. KSZ8041NLJ Power and Ground Connections .................................................................................................... 21 Figure 7. MII SQE Timing (10Base-T) ................................................................................................................................. 31 Figure 8. MII Transmit Timing (10Base-T) ........................................................................................................................... 32 Figure 9. MII Receive Timing (10Base-T) ............................................................................................................................ 33 Figure 10. MII Transmit Timing (100Base-TX)..................................................................................................................... 34 Figure 11. MII Receive Timing (100Base-TX)...................................................................................................................... 35 Figure 12. RMII Timing – Data Received from RMII ............................................................................................................ 36 Figure 13. RMII Timing – Data Input to RMII ....................................................................................................................... 36 Figure 14. Auto-Negotiation Fast Link Pulse (FLP) Timing ................................................................................................. 37 Figure 15. MDC/MDIO Timing.............................................................................................................................................. 38 Figure 16. Reset Timing....................................................................................................................................................... 39 Figure 17. Recommended Reset Circuit.............................................................................................................................. 40 Figure 18. Recommended Reset Circuit for interfacing with CPU/FPGA Reset Output...................................................... 40 Figure 19. Reference Circuits for LED Strapping Pins......................................................................................................... 41 April 2010 5 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ List of Tables Table 1. MII Management Frame Format ............................................................................................................................ 14 Table 2. MII Signal Definition ............................................................................................................................................... 15 Table 3. RMII Signal Description.......................................................................................................................................... 17 Table 4. MDI/MDI-X Pin Definition ....................................................................................................................................... 18 Table 5. KSZ8041NLJ Power Pin Description ..................................................................................................................... 21 Table 6. MII SQE Timing (10Base-T) Parameters ............................................................................................................... 31 Table 7. MII Transmit Timing (10Base-T) Parameters......................................................................................................... 32 Table 8. MII Receive Timing (10Base-T) Parameters.......................................................................................................... 33 Table 9. MII Transmit Timing (100Base-TX) Parameters .................................................................................................... 34 Table 10. MII Receive Timing (100Base-TX) Parameters ................................................................................................... 35 Table 11. RMII Timing Parameters ...................................................................................................................................... 36 Table 12. Auto-Negotiation Fast Link Pulse (FLP) Timing Parameters ............................................................................... 37 Table 13. MDC/MDIO Timing Parameters ........................................................................................................................... 38 Table 14. Reset Timing Parameters .................................................................................................................................... 39 Table 15. Transformer Selection Criteria ............................................................................................................................. 42 Table 16. Single Port Magnetic – Recommended Transformer Configuration .................................................................... 42 Table 17. Typical Reference Crystal Characteristics ........................................................................................................... 42 Pin Configuration ® 32-Pin (5mm x 5mm) MLF April 2010 6 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Pin Description (1) Pin Number Pin Name 1 GND GND 2 VDDPLL_1.8 P 1.8V analog VDD 3 VDDA_3.3 P 3.3V analog VDD 4 RX- I/O Physical receive or transmit signal (- differential) 5 RX+ I/O Physical receive or transmit signal (+ differential) 6 TX- I/O Physical transmit or receive signal (- differential) 7 TX+ I/O Physical transmit or receive signal (+ differential) 8 XO O Crystal feedback Type Pin Function Ground This pin is used only in MII mode when a 25MHz crystal is used. This pin is a no connect if oscillator or external clock source is used, or if RMII mode is selected. 9 XI / I REFCLK 10 REXT I/O Crystal / Oscillator / External Clock Input MII Mode: 25MHz +/-50ppm (crystal, oscillator, or external clock) RMII Mode: 50MHz +/-50ppm (oscillator, or external clock only) Set physical transmit output current Connect a 6.49KΩ resistor in parallel with a 100pF capacitor to ground on this pin. 11 MDIO I/O Management Interface (MII) Data I/O This pin requires an external 4.7KΩ pull-up resistor. 12 MDC I Management Interface (MII) Clock Input This pin is synchronous to the MDIO data interface. 13 RXD3 / Ipu/O PHYAD0 14 RXD2 / Ipd/O PHYAD1 15 16 RXD1 / Ipd/O Config Mode: The pull-up/pull-down value is latched as PHYADDR[0] during power-up / reset. See “Strapping Options” section for details. MII Mode: Receive Data Output[2] Config Mode: The pull-up/pull-down value is latched as PHYADDR[1] during power-up / reset. See “Strapping Options” section for details. MII Mode: Receive Data Output[1] (2) / (3) / (2) / RMII Mode: Receive Data Output[1] PHYAD2 Config Mode: The pull-up/pull-down value is latched as PHYADDR[2] during power-up / reset. See “Strapping Options” section for details. MII Mode: Receive Data Output[0] (2) / (3) / RXD0 / Ipu/O RXD[0] / RMII Mode: Receive Data Output[0] DUPLEX Config Mode: Latched as DUPLEX (register 0h, bit 8) during power-up / reset. See “Strapping Options” section for details. VDDIO_3.3 P 18 RXDV / Ipd/O April 2010 / Receive Data Output[3] RXD[1] / 17 19 (2) MII Mode: 3.3V digital VDD MII Mode: Receive Data Valid Output / CRSDV / RMII Mode: Carrier Sense/Receive Data Valid Output / CONFIG2 Config Mode: The pull-up/pull-down value is latched as CONFIG2 during power-up / reset. See “Strapping Options” section for details. MII Mode: Receive Clock Output RXC O 7 M9999-040110-1.0 Micrel, Inc. Pin Number 20 KSZ8041NLJ Pin Name RXER / Type (1) Ipd/O RX_ER / ISO 21 INTRP Opu Pin Function MII Mode: Receive Error Output / RMII Mode: Receive Error Output / Config Mode: The pull-up/pull-down value is latched as ISOLATE during power-up / reset. See “Strapping Options” section for details. Interrupt Output: Programmable Interrupt Output Register 1Bh is the Interrupt Control/Status Register for programming the interrupt conditions and reading the interrupt status. Register 1Fh bit 9 sets the interrupt output to active low (default) or active high. 22 TXC O MII Mode: Transmit Clock Output 23 TXEN / I MII Mode: Transmit Enable Input / RMII Mode: Transmit Enable Input MII Mode: Transmit Data Input[0] (4) RMII Mode: Transmit Data Input[0] (5) MII Mode: Transmit Data Input[1] (4) RMII Mode: Transmit Data Input[1] (5) MII Mode: Transmit Data Input[2] (4) / Transmit Data Input[3] (4) / TX_EN 24 TXD0 / I TXD[0] 25 TXD1 / I TXD[1] 26 27 28 TXD2 I TXD3 I COL / Ipd/O CONFIG0 29 CRS / Ipd/O CONFIG1 30 LED0 / NWAYEN Ipu/O MII Mode: / / MII Mode: Collision Detect Output / Config Mode: The pull-up/pull-down value is latched as CONFIG0 during power-up / reset. See “Strapping Options” section for details. MII Mode: Carrier Sense Output / Config Mode: The pull-up/pull-down value is latched as CONFIG1 during power-up / reset. See “Strapping Options” section for details. LED Output: Programmable LED0 Output / Config Mode: Latched as Auto-Negotiation Enable (register 0h, bit 12) during power-up / reset. See “Strapping Options” section for details. The LED0 pin is programmable via register 1Eh bits [15:14], and is defined as follows. LED mode = [00] Link/Activity Pin State LED Definition No Link H OFF Link L ON Activity Toggle Blinking Pin State LED Definition LED mode = [01] Link No Link H OFF Link L ON LED mode = [10] Reserved LED mode = [11] Reserved April 2010 8 M9999-040110-1.0 Micrel, Inc. Pin Number KSZ8041NLJ Pin Name 31 LED1 / Type (1) Ipu/O SPEED Pin Function LED Output: Programmable LED1 Output / Config Mode: Latched as SPEED (register 0h, bit 13) during power-up / reset. See “Strapping Options” section for details. The LED1 pin is programmable via register 1Eh bits [15:14], and is defined as follows. LED mode = [00] Speed Pin State LED Definition 10BT H OFF 100BT L ON LED mode = [01] Activity Pin State LED Definition No Activity H OFF Activity Toggle Blinking LED mode = [10] Reserved LED mode = [11] Reserved 32 RST# I PADDLE GND Gnd Chip Reset (active low) Ground Notes: 1. P = Power supply. Gnd = Ground. I = Input. O = Output. I/O = Bi-directional. Ipd = Input with internal pull-down (40K +/-30%). Ipu = Input with internal pull-up (40K +/-30%). Opu = Output with internal pull-up (40K +/-30%). Ipu/O = Input with internal pull-up (40K +/-30%) during power-up/reset; output pin otherwise. Ipd/O = Input with internal pull-down (40K +/-30%) during power-up/reset; output pin otherwise. 2. MII Rx Mode: The RXD[3..0] bits are synchronous with RXCLK. When RXDV is asserted, RXD[3..0] presents valid data to MAC through the MII. RXD[3..0] is invalid when RXDV is de-asserted. 3. RMII Rx Mode: The RXD[1:0] bits are synchronous with REF_CLK. For each clock period in which CRS_DV is asserted, two bits of recovered data are sent from the PHY. 4. MII Tx Mode: The TXD[3..0] bits are synchronous with TXCLK. When TXEN is asserted, TXD[3..0] presents valid data from the MAC through the MII. TXD[3..0] has no effect when TXEN is de-asserted. 5. RMII Tx Mode: The TXD[1:0] bits are synchronous with REF_CLK. For each clock period in which TX_EN is asserted, two bits of data are received by the PHY from the MAC. April 2010 9 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Strapping Options (1) Pin Number Pin Name 15 PHYAD2 Ipd/O 14 PHYAD1 Ipd/O The PHY Address is latched at power-up / reset and is configurable to any value from 1 to 7. 13 PHYAD0 Ipu/O The default PHY Address is 00001. 18 CONFIG2 Ipd/O 29 CONFIG1 Ipd/O 28 CONFIG0 Ipd/O Type Pin Function PHY Address bits [4:3] are always set to ‘00’. 20 ISO Ipd/O The CONFIG[2:0] strap-in pins are latched at power-up / reset and are defined as follows: CONFIG[2:0] Mode 000 MII (default) 001 RMII 010 Reserved – not used 011 Reserved – not used 100 MII 100Mbps Preamble Restore 101 Reserved – not used 110 Reserved – not used 111 Reserved – not used ISOLATE mode Pull-up = Enable Pull-down (default) = Disable During power-up / reset, this pin value is latched into register 0h bit 10. 31 SPEED Ipu/O SPEED mode Pull-up (default) = 100Mbps Pull-down = 10Mbps During power-up / reset, this pin value is latched into register 0h bit 13 as the Speed Select, and also is latched into register 4h (Auto-Negotiation Advertisement) as the Speed capability support. 16 DUPLEX Ipu/O DUPLEX mode Pull-up (default) = Half Duplex Pull-down = Full Duplex During power-up / reset, this pin value is latched into register 0h bit 8 as the Duplex Mode. 30 NWAYEN Ipu/O Nway Auto-Negotiation Enable Pull-up (default) = Enable Auto-Negotiation Pull-down = Disable Auto-Negotiation During power-up / reset, this pin value is latched into register 0h bit 12. Note: 1. Ipu/O = Input with internal pull-up (40K +/-30%) during power-up/reset; output pin otherwise. Ipd/O = Input with internal pull-down (40K +/-30%) during power-up/reset; output pin otherwise. Pin strap-ins are latched during power-up or reset. In some systems, the MAC receive input pins may drive high during power-up or reset, and consequently cause the PHY strap-in pins on the MII/RMII signals to be latched high. In this case, it is recommended to add 1K pull-downs on these PHY strap-in pins to ensure the PHY does not strap-in to ISOLATE mode, or is not configured with an incorrect PHY Address. April 2010 10 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Functional Description The KSZ8041NLJ is a single 3.3V supply Fast Ethernet transceiver. It is fully compliant with the IEEE 802.3u specification. On the media side, the KSZ8041NLJ supports 10Base-T and 100Base-TX with HP auto MDI/MDI-X for reliable detection of and correction for straight-through and crossover cables. The KSZ8041NLJ offers a choice of MII or RMII data interface connection with the MAC processor. The MII management bus option gives the MAC processor complete access to the KSZ8041NLJ control and status registers. Additionally, an interrupt pin eliminates the need for the processor to poll for PHY status change. Physical signal transmission and reception are enhanced through the use of patented analog circuitries that make the design more efficient and allow for lower power consumption and smaller chip die size. 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 125MHz 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. The output current is set by an external 6.49kΩ1% resistor for the 1:1 transformer ratio. It has typical rise/fall times of 4 ns and complies with the ANSI TP-PMD standard regarding amplitude balance, overshoot and timing jitter. The waveshaped 10Base-T output drivers are also incorporated into the 100Base-TX drivers. 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 must 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 125MHz 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 the MII format and provided as the input data to the MAC. PLL Clock Synthesizer The KSZ8041NLJ generates 125MHz, 25MHz and 20MHz clocks for system timing. Internal clocks are generated from an external 25MHz crystal or oscillator. In RMII mode, these internal clocks are generated from an external 50MHz oscillator or system clock. Scrambler/De-scrambler (100Base-TX only) The purpose of the scrambler is to spread the power spectrum of the signal in order to reduce EMI and baseline wander. 10Base-T Transmit The 10Base-T drivers are incorporated with the 100Base-TX drivers to allow for transmission using the same magnetic. The drivers also perform internal wave-shaping and pre-emphasize, and output 10Base-T signals with a typical amplitude of 2.5V peak. The 10Base-T signals have harmonic contents that are at least 27dB below the fundamental frequency when driven by an all-ones Manchester-encoded signal. 10Base-T Receive On the receive side, input buffer and level detecting squelch circuits are employed. A differential input receiver circuit and a PLL performs 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 400mV or with short pulse widths to prevent noise at the RX+ and April 2010 11 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ RX- inputs from falsely trigger the decoder. When the input exceeds the squelch limit, the PLL locks onto the incoming signal and the KSZ8041NLJ decodes a data frame. The receive clock is kept active during idle periods in between data reception. SQE and Jabber Function (10Base-T only) In 10Base-T operation, a short pulse is put out on the COL pin after each frame is transmitted. This SQE Test is required as a test of the 10Base-T transmit/receive path. If transmit enable (TXEN) is high for more than 20ms (jabbering), the 10Base-T transmitter is disabled and COL is asserted high. If TXEN is then driven low for more than 250ms, the 10BaseT transmitter is re-enabled and COL is de-asserted (returns to low). Auto-Negotiation The KSZ8041NLJ conforms to the auto-negotiation protocol, defined in Clause 28 of the IEEE 802.3u specification. Autonegotiation is enabled by either hardware pin strapping (pin 30) or software (register 0h bit 12). Auto-negotiation allows unshielded twisted pair (UTP) link partners to select the highest common mode of operation. Link partners advertise their capabilities to each other, and then compare their own capabilities with those they received from their link partners. The highest speed and duplex setting that is common to the two link partners is selected as the mode of operation. The following list shows the speed and duplex operation mode from highest to lowest. • Priority 1: 100Base-TX, full-duplex • Priority 2: 100Base-TX, half-duplex • Priority 3: 10Base-T, full-duplex • Priority 4: 10Base-T, half-duplex If auto-negotiation is not supported or the KSZ8041NLJ link partner is forced to bypass auto-negotiation, the KSZ8041NLJ sets its operating mode by observing the signal at its receiver. This is known as parallel detection, and allows the KSZ8041NLJ to establish link by listening for a fixed signal protocol in the absence of auto-negotiation advertisement protocol. The auto-negotiation link up process is shown in the following flow chart. April 2010 12 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Start Auto Negotiation Force Link Setting N o Parallel Operation Yes Bypass Auto Negotiation and Set Link Mode Attempt Auto Negotiation Listen for 100BASE-TX Idles Listen for 10BASE-T Link Pulses No Join Flow Link Mode Set ? Yes Link Mode Set Figure 1. Auto-Negotiation Flow Chart April 2010 13 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ MII Management (MIIM) Interface The KSZ8041NLJ supports the IEEE 802.3 MII Management Interface, also known as the Management Data Input / Output (MDIO) Interface. This interface allows upper-layer devices to monitor and control the state of the KSZ8041NLJ. An external device with MIIM capability is used to read the PHY status and/or configure the PHY settings. Additional details on the MIIM interface can be found in Clause 22.2.4.5 of the IEEE 802.3u Specification. The MIIM interface consists of the following: • A physical connection that incorporates the clock line (MDC) and the data line (MDIO). • A specific protocol that operates across the aforementioned physical connection that allows an external controller to communicate with one or more KSZ8041NLJ devices. Each KSZ8041NLJ device is assigned a PHY address between 1 and 7 by the PHYAD[2:0] strapping pins. • An internal addressable set of thirteen 16-bit MDIO registers. Register [0:6] are required, and their functions are defined by the IEEE 802.3u Specification. The additional registers are provided for expanded functionality. The KSZ8041NLJ supports MIIM in both MII mode and RMII mode. The following table shows the MII Management frame format for the KSZ8041NLJ. Preamble Start of Frame Read/Write PHY REG OP Code Address Address Bits [4:0] Bits [4:0] TA Data Idle Bits [15:0] Read 32 1’s 01 10 00AAA RRRRR Z0 DDDDDDDD_DDDDDDDD Z Write 32 1’s 01 01 00AAA RRRRR 10 DDDDDDDD_DDDDDDDD Z Table 1. MII Management Frame Format Interrupt (INTRP) INTRP (pin 21) is an optional interrupt signal that is used to inform the external controller that there has been a status update in the KSZ8041NLJ PHY register. Bits[15:8] of register 1Bh are the interrupt control bits, and are used to enable and disable the conditions for asserting the INTRP signal. Bits[7:0] of register 1Bh are the interrupt status bits, and are used to indicate which interrupt conditions have occurred. The interrupt status bits are cleared after reading register 1Bh. Bit 9 of register 1Fh sets the interrupt level to active high or active low. MII Data Interface The Media Independent Interface (MII) is specified in Clause 22 of the IEEE 802.3u specification. It provides a common interface between physical layer and MAC layer devices, and has the following key characteristics: • Supports 10Mbps and 100Mbps data rates. • Uses a 25MHz reference clock, sourced by the PHY. • Provides independent 4-bit wide (nibble) transmit and receive data paths. • Contains two distinct groups of signals: one for transmission and the other for reception. By default, the KSZ8041NLJ is configured in MII mode after it is power-up or reset with the following: • A 25MHz crystal connected to XI, XO (pins 9, 8), or an external 25MHz clock source (oscillator) connected to XI. • CONFIG[2:0] (pins 18, 29, 28) set to ‘000’ (default setting). April 2010 14 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ MII Signal Definition The following table describes the MII signals. Refer to Clause 22 of the IEEE 802.3u Specification for detailed information. MII Signal Name Direction (with respect to PHY, KSZ8041NLJ signal) Direction (with respect to MAC) TXC Output Input Description Transmit Clock (2.5MHz for 10Mbps; 25MHz for 100Mbps) TXEN Input Output Transmit Enable TXD[3:0] Input Output Transmit Data [3:0] RXC Output Input Receive Clock RXDV Output Input Receive Data Valid RXD[3:0] Output Input Receive Data [3:0] (2.5MHz for 10Mbps; 25MHz for 100Mbps) RXER Output Input, or (not required) Receive Error CRS Output Input Carrier Sense COL Output Input Collision Detection Table 2. MII Signal Definition Transmit Clock (TXC) TXC is sourced by the PHY. It is a continuous clock that provides the timing reference for TXEN and TXD[3:0]. TXC is 2.5MHz for 10Mbps operation and 25MHz for 100Mbps operation. Transmit Enable (TXEN) TXEN indicates the MAC is presenting nibbles on TXD[3:0] for transmission. It is asserted synchronously with the first nibble of the preamble and remains asserted while all nibbles to be transmitted are presented on the MII, and is negated prior to the first TXC following the final nibble of a frame. TXEN transitions synchronously with respect to TXC. Transmit Data [3:0] (TXD[3:0]) TXD[3:0] transitions synchronously with respect to TXC. When TXEN is asserted, TXD[3:0] are accepted for transmission by the PHY. TXD[3:0] is ”00” to indicate idle when TXEN is de-asserted. Values other than “00” on TXD[3:0] while TXEN is de-asserted are ignored by the PHY. Receive Clock (RXC) RXC provides the timing reference for RXDV, RXD[3:0], and RXER. • In 10Mbps mode, RXC is recovered from the line while carrier is active. RXC is derived from the PHY’s reference clock when the line is idle, or link is down. • In 100Mbps mode, RXC is continuously recovered from the line. If link is down, RXC is derived from the PHY’s reference clock. RXC is 2.5MHz for 10Mbps operation and 25MHz for 100Mbps operation. April 2010 15 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Receive Data Valid (RXDV) RXDV is driven by the PHY to indicate that the PHY is presenting recovered and decoded nibbles on RXD[3:0]. • In 10Mbps mode, RXDV is asserted with the first nibble of the SFD (Start of Frame Delimiter), “5D”, and remains asserted until the end of the frame. • In 100Mbps mode, RXDV is asserted from the first nibble of the preamble to the last nibble of the frame. RXDV transitions synchronously with respect to RXC. Receive Data [3:0] (RXD[3:0]) RXD[3:0] transitions synchronously with respect to RXC. For each clock period in which RXDV is asserted, RXD[3:0] transfers a nibble of recovered data from the PHY. Receive Error (RXER) RXER is asserted for one or more RXC periods to indicate that a Symbol Error (e.g. a coding error that a PHY is capable of detecting, and that may otherwise be undetectable by the MAC sub-layer) was detected somewhere in the frame presently being transferred from the PHY. RXER transitions synchronously with respect to RXC. While RXDV is de-asserted, RXER has no effect on the MAC. Carrier Sense (CRS) CRS is asserted and de-asserted as follows: • In 10Mbps mode, CRS assertion is based on the reception of valid preambles. CRS de-assertion is based on the reception of an end-of-frame (EOF) marker. • In 100Mbps mode, CRS is asserted when a start-of-stream delimiter, or /J/K symbol pair is detected. CRS is deasserted when an end-of-stream delimiter, or /T/R symbol pair is detected. Additionally, the PMA layer de-asserts CRS if IDLE symbols are received without /T/R. Collision (COL) COL is asserted in half-duplex mode whenever the transmitter and receiver are simultaneously active on the line. This is used to inform the MAC that a collision has occurred during its transmission to the PHY. COL transitions asynchronously with respect to TXC and RXC. Reduced MII (RMII) Data Interface The Reduced Media Independent Interface (RMII) specifies a low pin count Media Independent Interface (MII). It provides a common interface between physical layer and MAC layer devices, and has the following key characteristics: • Supports 10Mbps and 100Mbps data rates. • Uses a single 50MHz reference clock provided by the MAC or the system board. • Provides independent 2-bit wide (di-bit) transmit and receive data paths. • Contains two distinct groups of signals: one for transmission and the other for reception. The KSZ8041NLJ is configured in RMII mode after it is power-up or reset with the following: • A 50MHz reference clock connected to REFCLK (pin 9). • CONFIG[2:0] (pins 18, 29, 28) set to ‘001’. In RMII mode, unused MII signals, TXD[3:2] (pins 27, 26), are tied to ground. April 2010 16 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ RMII Signal Definition The following table describes the RMII signals. Refer to RMII Specification for detailed information. RMII Signal Name Direction (with respect to PHY, KSZ8041NLJ signal) Direction (with respect to MAC) REF_CLK Input Input, or Output Synchronous 50 MHz clock reference for receive, transmit and control interface TX_EN Input Output Transmit Enable TXD[1:0] Input Output Transmit Data [1:0] CRS_DV Output Input Carrier Sense/Receive Data Valid RXD[1:0] Output Input Receive Data [1:0] RX_ER Output Input, or (not required) Receive Error Description Table 3. RMII Signal Description Reference Clock (REF_CLK) REF_CLK is sourced by the MAC or system board. It is a continuous 50MHz clock that provides the timing reference for TX_EN, TXD[1:0], CRS_DV, RXD[1:0], and RX_ER. Transmit Enable (TX_EN) TX_EN indicates that the MAC is presenting di-bits on TXD[1:0] for transmission. It is asserted synchronously with the first nibble of the preamble and remains asserted while all di-bits to be transmitted are presented on the RMII, and is negated prior to the first REF_CLK following the final di-bit of a frame. TX_EN transitions synchronously with respect to REF_CLK. Transmit Data [1:0] (TXD[1:0]) TXD[1:0] transitions synchronously with respect to REF_CLK. When TX_EN is asserted, TXD[1:0] are accepted for transmission by the PHY. TXD[1:0] is ”00” to indicate idle when TX_EN is de-asserted. Values other than “00” on TXD[1:0] while TX_EN is de-asserted are ignored by the PHY. Carrier Sense/Receive Data Valid (CRS_DV) CRS_DV is asserted by the PHY when the receive medium is non-idle. It is asserted asynchronously on detection of carrier. This is when squelch is passed in 10Mbps mode, and when 2 non-contiguous zeroes in 10 bits are detected in 100Mbps mode. Loss of carrier results in the de-assertion of CRS_DV. So long as carrier detection criteria are met, CRS_DV remains asserted continuously from the first recovered di-bit of the frame through the final recovered di-bit, and it is negated prior to the first REF_CLK that follows the final di-bit. The data on RXD[1:0] is considered valid once CRS_DV is asserted. However, since the assertion of CRS_DV is asynchronous relative to REF_CLK, the data on RXD[1:0] is "00" until proper receive signal decoding takes place. Receive Data [1:0] (RXD[1:0]) RXD[1:0] transitions synchronously to REF_CLK. For each clock period in which CRS_DV is asserted, RXD[1:0] transfers two bits of recovered data from the PHY. RXD[1:0] is "00" to indicate idle when CRS_DV is de-asserted. Values other than “00” on RXD[1:0] while CRS_DV is de-asserted are ignored by the MAC. Receive Error (RX_ER) RX_ER is asserted for one or more REF_CLK periods to indicate that a Symbol Error (e.g. a coding error that a PHY is capable of detecting, and that may otherwise be undetectable by the MAC sub-layer) was detected somewhere in the frame presently being transferred from the PHY. RX_ER transitions synchronously with respect to REF_CLK. While CRS_DV is de-asserted, RX_ER has no effect on the MAC. April 2010 17 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Collision Detection The MAC regenerates the COL signal of the MII from TX_EN and CRS_DV. HP Auto MDI/MDI-X HP Auto MDI/MDI-X configuration eliminates the confusion of whether to use a straight cable or a crossover cable between the KSZ8041NLJ and its link partner. This feature allows the KSZ8041NLJ to use either type of cable to connect with a link partner that is in either MDI or MDI-X mode. The auto-sense function detects transmit and receive pairs from the link partner, and then assigns transmit and receive pairs of the KSZ8041NLJ accordingly. HP Auto MDI/MDI-X is enabled by default. It is disabled by writing a one to register 1F bit 13. MDI and MDI-X mode is selected by register 1F bit 14 if HP Auto MDI/MDI-X is disabled. An isolation transformer with symmetrical transmit and receive data paths is recommended to support auto MDI/MDI-X. The IEEE 802.3u standard defines MDI and MDI-X as follow: MDI MDI-X RJ-45 Pin Signal RJ-45 Pin Signal 1 TD+ 1 RD+ 2 TD- 2 RD- 3 RD+ 3 TD+ 6 RD- 6 TD- Table 4. MDI/MDI-X Pin Definition Straight Cable A straight cable connects a MDI device to a MDI-X device, or a MDI-X device to a MDI device. The following diagram depicts a typical straight cable connection between a NIC card (MDI) and a switch, or hub (MDI-X). 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 Transmit Pair Modular Connector (RJ-45) HUB (Repeater or Switch) Modular Connector (RJ-45) NIC Figure 2. Typical Straight Cable Connection April 2010 18 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Crossover Cable A crossover cable connects a MDI device to another MDI device, or a MDI-X device to another MDI-X device. The following diagram depicts a typical crossover cable connection between two switches or hubs (two MDI-X devices). 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) Modular Connector (RJ-45) HUB (Repeater or Switch) Figure 3. Typical Crossover Cable Connection April 2010 19 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Power Management The KSZ8041NLJ offers the following power management modes: Power Saving Mode This mode is used to reduce power consumption when the cable is unplugged. It is in effect when auto-negotiation mode is enabled, cable is disconnected, and register 1F bit 10 is set to 1. Under power saving mode, the KSZ8041NLJ shuts down all transceiver blocks, except for transmitter, energy detect and PLL circuits. Additionally, in MII mode, the RXC clock output is disabled. RXC clock is enabled after the cable is connected and link is established. Power saving mode is disabled by writing a zero to register 1F bit 10. Power Down Mode This mode is used to power down the entire KSZ8041NLJ device when it is not in use. Power down mode is enabled by writing a one to register 0 bit 11. In the power down state, the KSZ8041NLJ disables all internal functions, except for the MII management interface. Reference Clock Connection Options A crystal or clock source, such as an oscillator, is used to provide the reference clock for the KSZ8041NLJ. The reference clock is 25MHz for MII mode and 50MHz for RMII mode. The following two figures illustrate how to connect the reference clock to XI / REFCLK (pin 9) and XO (pin 8) of the KSZ8041NLJ. Figure 4. 25MHz Crystal / Oscillator Reference Clock for MII Mode Figure 5. 50MHz Oscillator Reference Clock for RMII Mode April 2010 20 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Reference Circuit for Power and Ground Connections The KSZ8041NLJ is a single 3.3V supply device with a built-in 1.8V low noise regulator. The power and ground connections are shown in the following figure and table. Ferrite Bead ` 3 ` 22uF VOUT VIN VDDA_3.3 1.8V Low Noise Regulator (integrated) 0.1uF 2.2uF 0.1uF VDDPLL_1.8 2 17 3.3V VDDIO_3.3 ` 22uF 0.1uF KSZ8041NLJ GND 1 Paddle Figure 6. KSZ8041NLJ Power and Ground Connections Power Pin Pin Number Description VDDPLL_1.8 2 Decouple with 2.2uF and 0.1uF capacitors-to-ground. VDDA_3.3 3 Connect to board’s 3.3V supply through ferrite bead. VDDIO_3.3 17 Connect to board’s 3.3V supply. Table 5. KSZ8041NLJ Power Pin Description April 2010 21 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Register Map Register Number (Hex) Description 0h Basic Control 1h Basic Status 2h PHY Identifier 1 3h PHY Identifier 2 4h Auto-Negotiation Advertisement 5h Auto-Negotiation Link Partner Ability 6h Auto-Negotiation Expansion 7h Auto-Negotiation Next Page 8h Link Partner Next Page Ability 9h – 14h Reserved 15h RXER Counter 16h – 1Ah Reserved 1Bh Interrupt Control/Status 1Ch – 1Dh Reserved 1Eh PHY Control 1 1Fh PHY Control 2 Register Description Address Name (1) Description Mode 1 = Software reset RW/SC 0 RW 0 RW Set by SPEED strapping pin. Default Register 0h – Basic Control 0.15 Reset 0 = Normal operation This bit is self-cleared after a ‘1’ is written to it. 0.14 Loop-back 0.13 Speed Select (LSB) 1 = Loop-back mode 0 = Normal operation 1 = 100Mbps 0 = 10Mbps See “Strapping Options” section for details. This bit is ignored if auto-negotiation is enabled (register 0.12 = 1). 0.12 0.11 AutoNegotiation Enable 1 = Enable auto-negotiation process Power Down 1 = Power down mode RW 0 = Disable auto-negotiation process Set by NWAYEN strapping pin. See “Strapping Options” section for details. If enabled, auto-negotiation result overrides settings in register 0.13 and 0.8. RW 0 RW Set by ISO strapping pin. 0 = Normal operation 0.10 Isolate 1 = Electrical isolation of PHY from MII and TX+/TX- See “Strapping Options” section for details. 0 = Normal operation 0.9 Restart AutoNegotiation 1 = Restart auto-negotiation process RW/SC 0 0 = Normal operation. This bit is self-cleared after a ‘1’ is written to it. April 2010 22 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Address Name Description Mode 0.8 Duplex Mode 1 = Full-duplex RW (1) 0 = Half-duplex Default Inverse of DUPLEX strapping pin value. See “Strapping Options” section for details. 0.7 Collision Test 1 = Enable COL test RW 0 RO 000_000 RW 0 RO 0 RO 1 RO 1 RO 1 RO 1 RO 0000 RO 1 RO 0 RO/LH 0 RO 1 RO/LL 0 RO/LH 0 1 = Supports extended capabilities registers RO 1 Assigned to the 3rd through 18th bits of the Organizationally Unique Identifier (OUI). Kendin Communication’s OUI is 0010A1 (hex) RO 0022h 0 = Disable COL test 0.6:1 Reserved 0.0 Disable 0 = Enable transmitter Transmitter 1 = Disable transmitter Register 1h – Basic Status 1.15 100Base-T4 1 = T4 capable 0 = Not T4 capable 1.14 100Base-TX Full Duplex 1 = Capable of 100Mbps full-duplex 1.13 100Base-TX Half Duplex 1 = Capable of 100Mbps half-duplex 1.12 10Base-T Full Duplex 1 = Capable of 10Mbps full-duplex 10Base-T Half Duplex 1 = Capable of 10Mbps half-duplex 1.11 1.10:7 Reserved 1.6 No Preamble 0 = Not capable of 100Mbps full-duplex 0 = Not capable of 100Mbps half-duplex 0 = Not capable of 10Mbps full-duplex 0 = Not capable of 10Mbps half-duplex 1 = Preamble suppression 0 = Normal preamble 1.5 1.4 AutoNegotiation Complete 1 = Auto-negotiation process completed Remote Fault 1 = Remote fault 0 = Auto-negotiation process not completed 0 = No remote fault 1.3 AutoNegotiation Ability 1 = Capable to perform auto-negotiation 1.2 Link Status 1 = Link is up 1.1 Jabber Detect 1 = Jabber detected 0 = Not capable to perform auto-negotiation 0 = Link is down 0 = Jabber not detected (default is low) 1.0 Extended Capability Register 2h – PHY Identifier 1 2.15:0 April 2010 PHY ID Number 23 M9999-040110-1.0 Micrel, Inc. Address KSZ8041NLJ Name Description Mode (1) Default Register 3h – PHY Identifier 2 3.15:10 PHY ID Number Assigned to the 19th through 24th bits of the Organizationally Unique Identifier (OUI). Kendin Communication’s OUI is 0010A1 (hex) RO 0001_01 3.9:4 Model Number Six bit manufacturer’s model number RO 01_0001 3.3:0 Revision Number Four bit manufacturer’s revision number RO Indicates silicon revision RW 0 RO 0 RW 0 RO 0 RW 00 RO 0 RW Set by SPEED strapping pin. Register 4h – Auto-Negotiation Advertisement 4.15 Next Page 4.14 Reserved 4.13 Remote Fault 4.12 Reserved 4.11:10 Pause 1 = Next page capable 0 = No next page capability. 1 = Remote fault supported 0 = No remote fault [00] = No PAUSE [10] = Asymmetric PAUSE [01] = Symmetric PAUSE [11] = Asymmetric & Symmetric PAUSE 4.9 100Base-T4 1 = T4 capable 0 = No T4 capability 4.8 100Base-TX Full-Duplex 1 = 100Mbps full-duplex capable 100Base-TX Half-Duplex 1 = 100Mbps half-duplex capable 10Base-T Full-Duplex 1 = 10Mbps full-duplex capable 4.5 10Base-T Half-Duplex 1 = 10Mbps half-duplex capable 4.4:0 Selector Field [00001] = IEEE 802.3 4.7 4.6 0 = No 100Mbps full-duplex capability See “Strapping Options” section for details. RW 0 = No 100Mbps half-duplex capability Set by SPEED strapping pin. See “Strapping Options” section for details. RW 1 RW 1 RW 0_0001 RO 0 RO 0 RO 0 RO 0 RO 00 0 = No 10Mbps full-duplex capability 0 = No 10Mbps half-duplex capability Register 5h – Auto-Negotiation Link Partner Ability 5.15 Next Page 1 = Next page capable 0 = No next page capability 5.14 Acknowledge 1 = Link code word received from partner 5.13 Remote Fault 1 = Remote fault detected 0 = Link code word not yet received 0 = No remote fault 5.12 Reserved 5.11:10 Pause [00] = No PAUSE [10] = Asymmetric PAUSE [01] = Symmetric PAUSE [11] = Asymmetric & Symmetric PAUSE April 2010 24 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ (1) Address Name Description Mode Default 5.9 100Base-T4 1 = T4 capable RO 0 5.8 100Base-TX Full-Duplex 1 = 100Mbps full-duplex capable RO 0 100Base-TX Half-Duplex 1 = 100Mbps half-duplex capable RO 0 10Base-T Full-Duplex 1 = 10Mbps full-duplex capable RO 0 5.5 10Base-T Half-Duplex 1 = 10Mbps half-duplex capable RO 0 5.4:0 Selector Field [00001] = IEEE 802.3 RO 0_0001 RO 0000_0000_000 RO/LH 0 RO 0 RO 1 RO/LH 0 RO 0 RW 0 RO 0 RW 1 RW 0 RO 0 RW 000_0000_0001 RO 0 RO 0 0 = No T4 capability 5.7 5.6 0 = No 100Mbps full-duplex capability 0 = No 100Mbps half-duplex capability 0 = No 10Mbps full-duplex capability 0 = No 10Mbps half-duplex capability Register 6h – Auto-Negotiation Expansion 6.15:5 Reserved 6.4 Parallel Detection Fault 1 = Fault detected by parallel detection Link Partner Next Page Able 1 = Link partner has next page capability Next Page Able 1 = Local device has next page capability 6.3 6.2 6.1 Page Received 0 = No fault detected by parallel detection. 0 = Link partner does not have next page capability 0 = Local device does not have next page capability 1 = New page received 0 = New page not received yet 6.0 Link Partner AutoNegotiation Able 1 = Link partner has auto-negotiation capability 0 = Link partner does not have auto-negotiation capability Register 7h – Auto-Negotiation Next Page 7.15 Next Page 7.14 Reserved 7.13 Message Page 1 = Additional next page(s) will follow 0 = Last page 1 = Message page 0 = Unformatted page 7.12 Acknowledge2 1 = Will comply with message 0 = Cannot comply with message 7.11 Toggle 1 = Previous value of the transmitted link code word equaled logic one 0 = Logic zero 7.10:0 Message Field 11-bit wide field to encode 2048 messages Register 8h – Link Partner Next Page Ability 8.15 Next Page 1 = Additional Next Page(s) will follow 8.14 Acknowledge 1 = Successful receipt of link word 0 = Last page 0 = No successful receipt of link word April 2010 25 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ (1) Address Name Description Mode Default 8.13 Message Page 1 = Message page RO 0 8.12 Acknowledge2 1 = Able to act on the information RO 0 RO 0 RO 000_0000_0000 RO 0000_0000 RW 0 or 0 = Unformatted page 0 = Not able to act on the information 8.11 Toggle 1 = Previous value of transmitted link code word equal to logic zero 0 = Previous value of transmitted link code word equal to logic one 8.10:0 Message Field Register 14h – MII Control 14.15:8 Reserved 14.7 100Base-TX Preamble Restore 1 = Restore received preamble to MII output (random latency) 10Base-T Preamble Restore 1 = Restore received preamble to MII output 14.6 14.5:0 1 (if CONFIG[2:0] = 100) 0 = Consume 1-byte preamble before sending frame to MII output for fixed latency See “Strapping Options” section for details. RW 0 RO 00_0001 RO/SC 0000h RW 0 RW 0 RW 0 RW 0 RW 0 RW 0 RW 0 RW 0 0 = Remove all 7-bytes of preamble before sending frame (starting with SFD) to MII output Reserved Register 15h – RXER Counter 15.15:0 RXER Counter Receive error counter for Symbol Error frames Register 1Bh – Interrupt Control/Status 1b.15 1b.14 1b.13 1b.12 1b.11 1b.10 1b.9 1b.8 April 2010 Jabber Interrupt Enable 1 = Enable Jabber Interrupt Receive Error Interrupt Enable 1 = Enable Receive Error Interrupt Page Received Interrupt Enable 1 = Enable Page Received Interrupt Parallel Detect Fault Interrupt Enable 1 = Enable Parallel Detect Fault Interrupt Link Partner Acknowledge Interrupt Enable 1 = Enable Link Partner Acknowledge Interrupt Link Down Interrupt Enable 1= Enable Link Down Interrupt Remote Fault Interrupt Enable 1 = Enable Remote Fault Interrupt Link Up Interrupt Enable 1 = Enable Link Up Interrupt 0 = Disable Jabber Interrupt 0 = Disable Receive Error Interrupt 0 = Disable Page Received Interrupt 0 = Disable Parallel Detect Fault Interrupt 0 = Disable Link Partner Acknowledge Interrupt 0 = Disable Link Down Interrupt 0 = Disable Remote Fault Interrupt 0 = Disable Link Up Interrupt 26 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ (1) Address Name Description Mode 1b.7 Jabber Interrupt 1 = Jabber occurred RO/SC 0 1b.6 Receive Error Interrupt 1 = Receive Error occurred RO/SC 0 Page Receive Interrupt 1 = Page Receive occurred RO/SC 0 Parallel Detect Fault Interrupt 1 = Parallel Detect Fault occurred RO/SC 0 Link Partner Acknowledge Interrupt 1= Link Partner Acknowledge occurred RO/SC 0 1b.2 Link Down Interrupt 1= Link Down occurred RO/SC 0 1b.1 Remote Fault Interrupt 1= Remote Fault occurred RO/SC 0 Link Up Interrupt 1= Link Up occurred RO/SC 0 RW 00 1b.5 1b.4 1b.3 1b.0 Default 0 = Jabber did not occurred 0 = Receive Error did not occurred 0 = Page Receive did not occurred 0 = Parallel Detect Fault did not occurred 0= Link Partner Acknowledge did not occurred 0= Link Down did not occurred 0= Remote Fault did not occurred 0= Link Up did not occurred Register 1Eh – PHY Control 1 1e:15:14 LED mode [00] = LED1 : Speed LED0 : Link/Activity [01] = LED1 : Activity LED0 : Link [10], [11] = Reserved 1e.13 Polarity 0 = Polarity is not reversed RO 1 = Polarity is reversed 1e.12 Reserved 1e.11 MDI/MDI-X State 1e:10:8 Reserved 1e:7 Remote loopback 1e:6:0 RO 0 = MDI 0 RO 1 = MDI-X 0 = Normal mode RW 0 RW 1 RW 0 1 = Remote (analog) loop back is enable Reserved Register 1Fh – PHY Control 2 1f:15 HP_MDIX 0 = Micrel Auto MDI/MDI-X mode 1 = HP Auto MDI/MDI-X mode 1f:14 MDI/MDI-X Select When Auto MDI/MDI-X is disabled, 0 = MDI Mode Transmit on TX+/- (pins 7,6) and Receive on RX+/- (pins 5,4) 1 = MDI-X Mode Transmit on RX+/- (pins 5,4) and Receive on TX+/- (pins 7,6) April 2010 27 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ (1) Address Name Description Mode Default 1f:13 Pairswap Disable 1 = Disable auto MDI/MDI-X RW 0 1f.12 Energy Detect 1 = Presence of signal on RX+/- analog wire pair RO 0 RW 0 RW 0 RW 0 RW 1 RW 0 RO 0 RO 0 RO 000 RW 0 RW 0 0 = Enable auto MDI/MDI-X 0 = No signal detected on RX+/1f.11 Force Link 1 = Force link pass 0 = Normal link operation This bit bypasses the control logic and allow transmitter to send pattern even if there is no link. 1f.10 Power Saving 1 = Enable power saving 0 = Disable power saving If power saving mode is enabled and the cable is disconnected, the RXC clock output (in MII mode) is disabled. RXC clock is enabled after the cable is connected and link is established. 1f.9 Interrupt Level 1 = Interrupt pin active high 0 = Interrupt pin active low 1f.8 Enable Jabber 1 = Enable jabber counter 1f.7 AutoNegotiation Complete 1 = Auto-negotiation process completed Enable Pause (Flow Control) 1 = Flow control capable PHY Isolate 1 = PHY in isolate mode 0 = Disable jabber counter 1f.6 1f.5 0 = Auto-negotiation process not completed 0 = No flow control capability 0 = PHY in normal operation 1f.4:2 Operation Mode Indication [000] = still in auto-negotiation [001] = 10Base-T half-duplex [010] = 100Base-TX half-duplex [011] = reserved [101] = 10Base-T full-duplex [110] = 100Base-TX full-duplex [111] = reserved 1f.1 Enable SQE test 1 = Enable SQE test 1f.0 Disable Data Scrambling 1 = Disable scrambler 0 = Disable SQE test 0 = Enable scrambler Note: 1. RW = Read/Write. RO = Read only. SC = Self-cleared. LH = Latch high. LL = Latch low. April 2010 28 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VDDPLL_1.8) ............................................... -0.5V to +2.4V (VDDIO_3.3, VDDA_3.3) ................................... -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, 10sec.) ....................... 260°C Storage Temperature (Ts) ..........................-55°C to +150°C (3) ESD Rating .................................................................. 6kV Supply Voltage (VDDIO_3.3, VDDA_3.3) .......................... +3.135V to +3.465V Extended Ambient Temperature (TA).........-40°C to +125°C Maximum Junction Temperature (TJ Max) ................. 135°C Maximum Case Temperature (TC Max)...................... 150°C Thermal Resistance (θJA) .........................................34°C/W Thermal Resistance (θJC) ...........................................6°C/W Electrical Characteristics Symbol Parameter Condition Min Typ Max Units (4) Supply Current IDD1 100Base-TX IDD2 10Base-T Chip only (no transformer); 53.0 mA 38.0 mA Full-duplex traffic @ 100% utilization Chip only (no transformer); Full-duplex traffic @ 100% utilization IDD3 Power Saving Mode Ethernet cable disconnected (reg. 1F.10 = 1) 32.0 mA IDD4 Power Down Mode Software power down (reg. 0.11 = 1) 4.0 mA TTL Inputs VIH Input High Voltage VIL Input Low Voltage IIN Input Current 2.0 VIN = GND ~ VDDIO V -10 0.8 V 10 µA TTL Outputs VOH Output High Voltage IOH = -4mA VOL Output Low Voltage IOL = 4mA |Ioz| Output Tri-State Leakage 2.4 V 0.4 V 10 µA LED Outputs ILED Output Drive Current Each LED pin (LED0, LED1) 8 mA 100Base-TX Transmit (measured differentially after 1:1 transformer) VO Peak Differential Output Voltage VIMB Output Voltage Imbalance tr , tf Rise/Fall Time Rise/Fall Time Imbalance 100Ω termination across differential output 0.95 1.05 V 2 % 3 5 ns 0 0.5 ns + 0.25 ns 5 % 100Ω termination across differential output Duty Cycle Distortion Overshoot VSET Reference Voltage of ISET Output Jitter 0.65 Peak-to-peak 0.7 V 1.4 ns 2.8 V 3.5 ns 10Base-T Transmit (measured differentially after 1:1 transformer) VP tr , tf Peak Differential Output Voltage 100Ω termination across differential output Jitter Added Peak-to-peak Rise/Fall Time 2.2 25 ns 400 mV 10Base-T Receive VSQ April 2010 Squelch Threshold 5MHz square wave 29 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Notes: 1. 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. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Current consumption is for the single 3.3V supply KSZ8041NLJ device only, and includes the 1.8V supply voltage (VDDPLL_1.8) that is provided by the KSZ8041NLJ. The PHY port’s transformer consumes an additional 45mA @ 3.3V for 100Base-TX and 70mA @ 3.3V for 10Base-T. April 2010 30 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Timing Diagrams MII SQE Timing (10Base-T) Figure 7. MII SQE Timing (10Base-T) Timing Parameter Description Min Typ Max Unit tP TXC period 400 ns tWL TXC pulse width low 200 ns tWH TXC pulse width high 200 ns tSQE COL (SQE) delay after TXEN de-asserted 2.5 µs tSQEP COL (SQE) pulse duration 1.0 µs Table 6. MII SQE Timing (10Base-T) Parameters April 2010 31 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ MII Transmit Timing (10Base-T) Figure 8. MII Transmit Timing (10Base-T) Timing Parameter Description Min Typ Max Unit tP TXC period 400 ns tWL TXC pulse width low 200 ns tWH TXC pulse width high 200 ns tSU1 TXD[3:0] setup to rising edge of TXC 10 tSU2 TXEN setup to rising edge of TXC 10 ns tHD1 TXD[3:0] hold from rising edge of TXC 0 ns tHD2 TXEN hold from rising edge of TXC 0 ns tCRS1 TXEN high to CRS asserted latency 160 ns tCRS2 TXEN low to CRS de-asserted latency 510 ns ns Table 7. MII Transmit Timing (10Base-T) Parameters April 2010 32 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ MII Receive Timing (10Base-T) Figure 9. MII Receive Timing (10Base-T) Timing Parameter Description Min Typ tP RXC period 400 ns tWL RXC pulse width low 200 ns tWH RXC pulse width high 200 ns tOD (RXD[3:0], RXER, RXDV) output delay from rising edge of RXC tRLAT CRS to (RXD[3:0], RXER, RXDV) latency 182 Max 225 6.5 Unit ns µs Table 8. MII Receive Timing (10Base-T) Parameters April 2010 33 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ MII Transmit Timing (100Base-TX) Figure 10. MII Transmit Timing (100Base-TX) Timing Parameter Description Min Typ Max Unit tP TXC period 40 ns tWL TXC pulse width low 20 ns tWH TXC pulse width high 20 ns tSU1 TXD[3:0] setup to rising edge of TXC 10 ns tSU2 TXEN setup to rising edge of TXC 10 ns tHD1 TXD[3:0] hold from rising edge of TXC 0 ns tHD2 TXEN hold from rising edge of TXC 0 ns tCRS1 TXEN high to CRS asserted latency 34 ns tCRS2 TXEN low to CRS de-asserted latency 33 ns Table 9. MII Transmit Timing (100Base-TX) Parameters April 2010 34 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ MII Receive Timing (100Base-TX) Figure 11. MII Receive Timing (100Base-TX) Timing Parameter Description tP RXC period Min Typ 40 Max ns tWL RXC pulse width low 20 ns tWH RXC pulse width high tOD (RXD[3:0], RXER, RXDV) output delay from rising edge of RXC tRLAT CRS to RXDV latency 140 ns CRS to RXD[3:0] latency 52 ns CRS to RXER latency 60 ns 20 19 Unit ns 25 ns Table 10. MII Receive Timing (100Base-TX) Parameters April 2010 35 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ RMII Timing Figure 12. RMII Timing – Data Received from RMII Figure 13. RMII Timing – Data Input to RMII Timing Parameter Description Min Typ Max tcyc Clock cycle t1 Setup time 4 ns t2 Hold time 2 ns tod Output delay 3 20 Unit ns 9 ns Table 11. RMII Timing Parameters April 2010 36 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Auto-Negotiation Timing Figure 14. Auto-Negotiation Fast Link Pulse (FLP) Timing Timing Parameter Description Min Typ Max Units tBTB FLP Burst to FLP Burst 8 16 24 ms tFLPW FLP Burst width tPW Clock/Data Pulse width 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 Pulse per FLP Burst 17 2 ms 100 ns 33 Table 12. Auto-Negotiation Fast Link Pulse (FLP) Timing Parameters April 2010 37 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ MDC/MDIO Timing Figure 15. MDC/MDIO Timing Timing Parameter Description Min tP MDC period t1MD1 MDIO (PHY input) setup to rising edge of MDC 10 tMD2 MDIO (PHY input) hold from rising edge of MDC 4 tMD3 MDIO (PHY output) delay from rising edge of MDC Typ 400 Max Unit ns ns ns 222 ns Table 13. MDC/MDIO Timing Parameters April 2010 38 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Reset Timing The KSZ8041NLJ reset timing requirement is summarized in the following figure and table. Figure 16. Reset Timing Parameter Description tsr Stable supply voltage to reset high Min 10 Max Units ms tcs Configuration setup time 5 ns tch Configuration hold time 5 ns trc Reset to strap-in pin output 6 ns Table 14. Reset Timing Parameters After the de-assertion of reset, it is recommended to wait a minimum of 100µs before starting programming on the MIIM (MDC/MDIO) Interface. April 2010 39 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Reset Circuit The following reset circuit is recommended for powering up the KSZ8041NLJ if reset is triggered by the power supply. 3.3V D1: 1N4148 D1 KSZ8041NLJ R 10K RST# C 10uF Figure 17. Recommended Reset Circuit The following reset circuit is recommended for applications where reset is driven by another device (e.g., CPU or FPGA). At power-on-reset, R, C and D1 provide the necessary ramp rise time to reset the KSZ8041NLJ device. The RST_OUT_n from CPU/FPGA provides the warm reset after power up. 3.3V KSZ8041NLJ D1 R 10K CPU/FPGA RST# RST_OUT_n D2 C 10uF D1, D2: 1N4148 Figure 18. Recommended Reset Circuit for interfacing with CPU/FPGA Reset Output. April 2010 40 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Reference Circuits for LED Strapping Pins The following figure shows the reference circuits for pull-up, float and pull-down on the LED1 and LED0 strapping pins. 3.3V Pull-up KSZ8041NLJ LED pin 3.3V Float KSZ8041NLJ LED pin 3.3V Pull-down KSZ8041NLJ LED pin Figure 19. Reference Circuits for LED Strapping Pins April 2010 41 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Selection of Isolation Transformer A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode chokes is recommended for exceeding FCC requirements. The following table gives recommended transformer characteristics. Parameter Value Turns ratio 1 CT : 1 CT Test Condition Open-circuit inductance (min.) 350µH 100mV, 100kHz, 8mA Leakage inductance (max.) 0.4µH 1MHz (min.) Inter-winding capacitance (max.) 12pF D.C. resistance (max.) 0.9Ω Insertion loss (max.) -1.0dB HIPOT (min.) 1500Vrms 0MHz – 65MHz Table 15. Transformer Selection Criteria The Pulse Engineering device in the following table gives the recommended transformer configuration. At the time of publication, there is no extended high temperature magnetic available. Contact magnetic vendor for availability of o o extended high temperature rated (-40 C to +125 C) transformer. Magnetic Manufacturer Part Number Auto MDI-X Number of Port Pulse Engineering HX1188NL Yes 1 Table 16. Single Port Magnetic – Recommended Transformer Configuration Selection of Reference Crystal Characteristics Value Units Frequency 25 MHz Frequency tolerance (max) ±50 ppm Load capacitance (max) 22 pF Series resistance 40 Ω Table 17. Typical Reference Crystal Characteristics April 2010 42 M9999-040110-1.0 Micrel, Inc. KSZ8041NLJ Package Information 32-Pin (5mm x 5mm) MLF® Package MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. April 2010 43 M9999-040110-1.0