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SMSC LAN8720 manual

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  • Page 1

    SMSC LAN8720/LAN8720i Revision 1.0 (05-28-09) DA T ASHEET Datasheet PRODUCT FEA TURES LAN8720/LAN8720i Small Footprint RMII 10/100 Ethernet T ransceiver with HP Auto-MDIX Support Highlight s  Single-Chip Ethe rnet Physical Layer T ransceiver (PHY)  Comprehensive flexPWR ® T echnology — Flexible Power Management Architecture — Power savin[...]

  • Page 2

    ORDER NUMBER(S): LAN8720A-CP-TR FOR 24-PIN, QFN LEAD -FREE RO HS COMPLIANT P ACKAGE (0 TO +85°C TEMP) LAN8720Ai-CP-TR FOR 24-PIN, QFN LEAD-FREE RO HS COMPLIANT P ACKAGE (-4 0 TO +85°C TEMP) Reel Size is 4000 Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 2 SMSC LAN8720/LAN8720i DA T[...]

  • Page 3

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 3 Revision 1.0 (05-28-09) DA T ASHEET T able of Content s Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.1 General Terms and Conventions . . . . . .[...]

  • Page 4

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 4 SMSC LAN8720/LAN8720i DA T ASHEET 4.8 Auto-negotiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 4.8.1 Parallel Detection . . . . . . . . . . . . . .[...]

  • Page 5

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 5 Revision 1.0 (05-28-09) DA T ASHEET Chapter 9 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Chapter 10 Revision History . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 6

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 6 SMSC LAN8720/LAN8720i DA T ASHEET List of Figures Figure 1.1 LAN8720/LAN8720i System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 1.2 LAN8720/LAN8720i Archite ctural Overview . . . . [...]

  • Page 7

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 7 Revision 1.0 (05-28-09) DA T ASHEET List of T ables Table 2.1 LAN8720/L AN8 72 0i 24 -P IN QFN Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 3.1 Buffer Types . . . . . . . . . . . . . [...]

  • Page 8

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 8 SMSC LAN8720/LAN8720i DA T ASHEET Table 6.2 100M RMII Receive Timing Valu es (50MHz REF_CLK IN ) . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Table 6.3 100M RMII Transmit Timing Values (50MHz REF_CLK IN) . . . . . . . . . . [...]

  • Page 9

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 9 Revision 1.0 (05-28-09) DA T ASHEET Chapter 1 Introduction 1.1 General T erms and Conventions The following is list o f the general terms used in this docume nt: 1.2 General Description The LAN8720/LAN8720i is a low-p ower 10BASE-T/1 00[...]

  • Page 10

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 10 SMSC LAN8720/LAN8720i DA T ASHEET 1.3 Architectural Overview The LAN8720/LAN8720i is compl iant with IEEE 802.3-2005 standards (RMII Pins tolerant to 3.6V) and supports both IEEE 802.3-2005 compliant and vendor-specif ic register funct[...]

  • Page 11

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 1 1 Revision 1.0 (05-28-09) DA T ASHEET Figure 1.2 LAN8720/LAN8 720i Architectura l Overview 10M Rx Logic 100M Rx Logic DSP System: Clock Data Recovery Equalizer Analog-to- Digital 100M PLL Squelch & Filters 10M PLL Receive Section Ce[...]

  • Page 12

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 12 SMSC LAN8720/LAN8720i DA T ASHEET Chapter 2 Pin Configuration 2.1 Package Pin-out Di agram and Signal T able Figure 2.1 LAN8720/LAN8 720i 24-QFN Pin Assignments (TOP VIEW) VDD2A LED2/n INTSEL LED1/ REGOFF XTAL2 XTAL1/CLKI N RXD1/MO DE1[...]

  • Page 13

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 13 Revision 1.0 (05-28-09) DA T ASHEET T able 2.1 LAN8720/LA N872 0i 24-PIN QFN Pinout PIN NO. PIN NAME PIN NO. PIN NAME 1 VDD2A 13 MDC 2 LED2/nINTSEL 14 nINT/REFCLKO 3 LED1/REGOFF 15 nRST 4 XT AL2 16 TXEN 5 XT AL1 /CLKIN 17 TXD0 6 VDDCR [...]

  • Page 14

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 14 SMSC LAN8720/LAN8720i DA T ASHEET Chapter 3 Pin Description This chapter describes the signals on each pin. When a lower case “n” is used at the beginning of the signal name, it indicates that the signa l is active lo w . For examp[...]

  • Page 15

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 15 Revision 1.0 (05-28-09) DA T ASHEET 3.1 MAC Interface Signals 3.2 LED Signals T able 3.2 RMII Signals 24-QFN SIGNAL NAME 24-QFN PIN # T YPE DESCRIPTION TXD0 17 I8 Tr a n s m i t D a ta 0 : The MAC transmits data to the PHY using this s[...]

  • Page 16

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 16 SMSC LAN8720/LAN8720i DA T ASHEET 3.3 Management Signals 3.4 General Signals LED2/ nINTSEL 2I O P U LED2 – Link speed LED Indication. See Sect ion 5.3.7 for a description of LED modes. nINTSEL : On powe r-up or extern al reset, the m[...]

  • Page 17

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 17 Revision 1.0 (05-28-09) DA T ASHEET 3.5 10/100 Line Interface Signals 3.6 Analog Reference 3.7 Power Signals T able 3.6 10/100 Line Interfa ce Sig nals 24-QFN SIGNAL NAME 24-QFN PIN # T YPE DESCRIPTION TXP 21 AI O T ransmit/Receive Pos[...]

  • Page 18

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 18 SMSC LAN8720/LAN8720i DA T ASHEET Chapter 4 Architecture Det ails 4.1 T op Level Func tional Architecture Functionally , the transceiver can be divided into the following sections:  100Base-TX transmi t and receive  10Base-T tran[...]

  • Page 19

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 19 Revision 1.0 (05-28-09) DA T ASHEET 4.2.2 4B/5B Encoding The transmit data passes from the MII block to th e 4B/5B encoder . This block encodes the data from 4-bit nibbles to 5-bit symbols (known as “code-groups”) according to Ta b[...]

  • Page 20

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 20 SMSC LAN8720/LAN8720i DA T ASHEET 4.2.3 Scrambling Repeated data patterns (especially the IDLE code-grou p) can have power spectral den sities with large narrow-band peaks. Scramblin g the data helps eliminate these peaks and spre ad t[...]

  • Page 21

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 21 Revision 1.0 (05-28-09) DA T ASHEET 4.2.6 100M Phase Lock Loop (PLL)  The 100M PLL locks on to reference clock and g enera t es the 125MHz clock used to drive the 125 MHz logic and the 100Base-Tx Tr ansmitter . 4.3 100Base-TX Receiv[...]

  • Page 22

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 22 SMSC LAN8720/LAN8720i DA T ASHEET 4.3.3 NRZI and ML T -3 Decoding The DSP generates the ML T -3 recovered levels that are fed to th e ML T -3 converter . The ML T -3 is th en converted to an NRZI data stream. 4.3.4 Descrambling The des[...]

  • Page 23

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 23 Revision 1.0 (05-28-09) DA T ASHEET Figure 4.3 Relatio nship Between Recei ved Data and Specific MII Signals 4.3.8 Receiver Errors During a frame, unexpected co de-groups are consid ered receive errors. Expected code groups are the DA [...]

  • Page 24

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 24 SMSC LAN8720/LAN8720i DA T ASHEET In order to comply with legacy 10Ba se-T MAC/Controllers, in Half-duplex mode th e transceiver loops back the transmitted data, on the receive path. Th is does not confuse the MAC/Controller since the [...]

  • Page 25

    Small Foot print RMII 10/10 0 Ethernet T ransceive r with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 25 Revision 1.0 (05-28-09) DA T ASHEET 4.5.3 10M Receive Dat a Across the MII/RMII Interface For MII, the 4 bit data nibbles are sent to the MII block. In MII mode, these data nibbles are vali d on the rising edge of the 2.5 MHz RXCLK. Fo[...]

  • Page 26

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 26 SMSC LAN8720/LAN8720i DA T ASHEET CRS_DV toggles at 25 MHz in 100Mb/s mode and 2.5 MHz in 10Mb/s mode when CRS en ds before RXDV (i.e. the FIFO still has bits to transfer wh en the carrier event ends. ) T herefore, the MAC can accurate[...]

  • Page 27

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP A uto-MDIX Suppo rt Datasheet SMSC LAN8720/LAN8720i 27 Revision 1.0 (05-28-09) DA T ASHEET 4.7.1 REF_CLK In Mode A 50MHz source of REF_ CLK must be available ex ternal to the LAN8720 when using this mode. The clock is driven to both the MAC and PHY as shown in Figure 4.4 . 4.7.2 REF_CLK OU[...]

  • Page 28

    Small Footprint RM II 10/100 Ethernet Transceive r with HP Auto-MDIX Supp ort Datasheet Revision 1.0 (05-28-09) 28 SMSC LAN8720/LAN8720i DA T ASHEET In some system architectures, a 25MHz clock source is ava ilable. The LAN8720 can be used to generate the REF_CLK to the MAC as shown in F igure 4.6 . It is important to note that in this specific Figu[...]

  • Page 29

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 29 Revision 1.0 (05-28-09) DA T ASHEET example, only a 25MHz clock ca n be used (clock canno t be 50MHz). Simila r to the 25MHz crystal mode, the nINT function is disabled. The RMII REF_CLK is a conti nuous clock that provi des th e timing[...]

  • Page 30

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 30 SMSC LAN8720/LAN8720i DA T ASHEET  100M ADC (analog)  100M PLL (analog)  100M equalizer/BL W/clock recovery (DSP)  10M SQUELCH (analog)  10M PLL (analog)  10M T ransmitter (analog) When enabled, auto -negotiation i [...]

  • Page 31

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 31 Revision 1.0 (05-28-09) DA T ASHEET 4.8.1 Parallel Detection If the LAN8720/LAN8720i is connecte d to a devic e lacking the ability to auto-negotiate (i.e. no FLPs are detected), it is able to d etermine the speed of the li nk based on [...]

  • Page 32

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 32 SMSC LAN8720/LAN8720i DA T ASHEET 4.10 nINTSEL S trapping and LED Polarity Selecti on The LED2/nINTSEL pin is used to select be tween one of two available modes: REF_CLK In Mode and REF_CLK Out Mode. The configured mode determines th[...]

  • Page 33

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 33 Revision 1.0 (05-28-09) DA T ASHEET 4.1 1 REGOFF and LED Polarity Selection The REGOFF configuration pin i s shared with t he LED1 pin. The LED1 output will automa tically change polarity based on the presence o f an external pull-up re[...]

  • Page 34

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 34 SMSC LAN8720/LAN8720i DA T ASHEET 4.12 PHY Address S trapping The PHY ADDRESS bit is latched into an inte rnal regi ster at the end of a hardware rese t. The address bit is input on the RXER /PHY AD0 pin. The default setting is PHY A[...]

  • Page 35

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 35 Revision 1.0 (05-28-09) DA T ASHEET Figure 4.10 MDIO Timing a nd Frame Structure - READ Cycle Figure 4.1 1 MDI O Timing and Frame Structure - WRITE Cycle MDC MDI0 Read Cycle ... 3 2 1 ' s 0110 A 4 A 3 A 2 A 1 A 0 R 4 R 3 R 2 R 1 R [...]

  • Page 36

    Small Foot print RMII 10/100 Ethernet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 36 SMSC LAN8720/LAN8720i DA T ASHEET Chapter 5 SMI Register Mapping T able 5.1 Contro l Register: Register 0 (Basic) 15 14 13 12 1 1 10 9 8 7 6 5 4 3 2 1 0 Reset Loopback S peed Select A/N Enable Power Down Isolate Restart A/N Duplex Mod[...]

  • Page 37

    SMSC LAN8720/LAN8720i 37 Revision 1.0 (05-28-09) DA T ASHEET Small Footprint RMII 10/10 0 Ethernet Transceiver with HP Auto-MDIX Support Datasheet T able 5.5 Auto-Negotiation Advertisement: Register 4 (Extended) 15 14 13 12 1 1 10 9 8 7 6 5 4 3 2 1 0 Next Page Reserved Remote Fault Reserved Pause Operation 100Base- T4 100Base- TX Full Duplex 100Bas[...]

  • Page 38

    Small Foot print RMII 10/100 Ethernet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 38 SMSC LAN8720/LAN8720i DA T ASHEET RSVD = Reserved T abl e 5.10 Mode Control/ Status Register 17: V endor -Specific 1 5 14 13 12 1 1 10 9 8 7 6 5 4 3 2 1 0 RSVD EDPWRDOWN RSVD LOWSQEN MDPREBP F ARLOOPBACK RSVD AL TINT RSVD PHY ADBP For[...]

  • Page 39

    SMSC LAN8720/LAN8720i 39 Revision 1.0 (05-28-09) DA T ASHEET Small Footprint RMII 10/10 0 Ethernet Transceiver with HP Auto-MDIX Support Datasheet T able 5.15 Special Control/St atus In dicatio ns Register 27: V endor-Specific 1 5 1 4 1 3 1 2 1 1 1 0 98765 4 3 2 1 0 AMDIXCTRL Reserved CH_SELECT Reser ved SQEOFF Reserved XPOL Reserved T able 5.16 Sp[...]

  • Page 40

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 40 SMSC LAN8720/LAN8720i DA T ASHEET The following registers a re supported (registe r numbers are in decima l): 5.1 SMI Register Format The mode key is as follow s:  RW = Read/write,  SC = Self cleari ng,  WO = Write only , ?[...]

  • Page 41

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 41 Revision 1.0 (05-28-09) DA T ASHEET T able 5.21 Regis te r 0 - Ba sic Control ADDRESS NAME DESCRIPTION MODE DEFAULT 0.15 Reset 1 = sof tware reset. Bit is self-clearing. For be st results, when setting this bit do not set othe r bits in[...]

  • Page 42

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 42 SMSC LAN8720/LAN8720i DA T ASHEET 1.4 Remote Fault 1 = remote fault con dition detected 0 = no remote fault RO/ LH 0 1.3 Auto-Negotiate Ability 1 = able to perform auto -negotiati on function 0 = unable to perform auto-negotiation fu[...]

  • Page 43

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 43 Revision 1.0 (05-28-09) DA T ASHEET 4.9 100Base-T4 1 = T4 ab le, 0 = no T4 ability This Phy does not support 100Base-T4. RO 0 4.8 100Base-TX Full Duplex 1 = TX with full dup lex, 0 = no TX full duplex a bility RW Set by MODE[2:0] bus 4.[...]

  • Page 44

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 44 SMSC LAN8720/LAN8720i DA T ASHEET T able 5.27 Register 6 - Auto Negotiation Expansion ADDRESS NAME DESCRIPT IO N MODE DEFAULT 6.15:5 Reserved RO 0 6.4 Parallel Detection Fault 1 = fault detected by parallel detection log ic 0 = no fa[...]

  • Page 45

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 45 Revision 1.0 (05-28-09) DA T ASHEET 17.6 AL TINT Alternate Interrupt Mode. 0 = Primary interrupt syst em enabled (Default). 1 = Alternate interr upt system enabled. See Section 5.2, "Interrupt Manag ement," on page 48 . RW 0 1[...]

  • Page 46

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 46 SMSC LAN8720/LAN8720i DA T ASHEET T abl e 5.3 2 Register 2 7 - Speci al Control/St atus Indications ADDRESS NAME DESCRIPTION MODE DEFAULT 27.15 AMDIXCTRL HP Auto-MDIX con trol 0 - Auto-MDIX enable 1 - Auto-MDIX disabled (u se 27.13 t[...]

  • Page 47

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 47 Revision 1.0 (05-28-09) DA T ASHEET 29.1 INT 1 1 = Auto-Negotiation Page Re ceived 0 = not source of interrupt RO/ LH X 29.0 Reserved Ignore on re ad. RO/ LH 0 T able 5.35 Register 30 - In terru pt Mask ADDRESS NAME DESCRIPTION MODE DEF[...]

  • Page 48

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 48 SMSC LAN8720/LAN8720i DA T ASHEET 5.2 Interrupt Management The Management interface supports an interrupt cap ability that is not a pa rt of the IEEE 802.3 specification. It generat es an active low asynchron ous interr u pt signal o[...]

  • Page 49

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 49 Revision 1.0 (05-28-09) DA T ASHEET Note: The ENERGYON bit 17.1 is defau lted to a ‘1’ at the start of the signal a cquisition process, therefore the Interrupt source fl ag 29.7 will also read as a ‘1’ at power-up. If no signal [...]

  • Page 50

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 50 SMSC LAN8720/LAN8720i DA T ASHEET in repeater mode or full -duplex mode. Otherwise th e transceiver asserts CRS based on either transmit or receive activity . The carrier sense logic uses the e ncoded, unscrambled dat a to determine [...]

  • Page 51

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 51 Revision 1.0 (05-28-09) DA T ASHEET 5.3.5.1 General Power-Down This power-down is controlled by register 0, bit 1 1. In this mode the entire transceiver , except the management interface, is powe red-down and stays in that condition as [...]

  • Page 52

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 52 SMSC LAN8720/LAN8720i DA T ASHEET 5.3.8.1 Near-end Loopback Near-end loopback is a mo de that sends the digital tr ansmit data back out the receive data signals for testing purpose s as indi cate d by th e blue arrows in Figure 5. 1 [...]

  • Page 53

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 53 Revision 1.0 (05-28-09) DA T ASHEET transmit signals an the output of the transfo rmer back to the receiver inpu ts, and this loopback will work at both 10 and 100. 5.3.9 Configuration Signals The hardware configuration signals are samp[...]

  • Page 54

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 54 SMSC LAN8720/LAN8720i DA T ASHEET The MODE[2:0] hardware configuration pins are multiplexed with other signals as shown in Ta b l e 5 . 4 0 . T able 5.39 MODE[2:0] Bus MODE[2:0] MODE DEFINITIONS DEFAULT REGISTER BIT V ALUES REGISTER [...]

  • Page 55

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 55 Revision 1.0 (05-28-09) DA T ASHEET Chapter 6 AC Electrical Characteristics The timing dia grams and limits in this section define th e requirements placed on the external signals of the Phy . 6.1 Serial Management Interface (SMI) T imi[...]

  • Page 56

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 56 SMSC LAN8720/LAN8720i DA T ASHEET 6.2 RMII 10/100Base-TX/RX Ti mings (50MHz REF_CLK IN) The 50MHz REF_CLK IN timing ap plies to the case when n INTSEL is floated or pu lled-high on the LAN8720. In this mode, a 50MHz clock must be pro[...]

  • Page 57

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 57 Revision 1.0 (05-28-09) DA T ASHEET 6.2.1.2 100M RMII T ransmit Timing (5 0MHz REF_CLK IN) Figure 6 .3 100M RMII T ransm it Timing Diagram (50MHz REF_CLK IN) T able 6.3 100M RMII T ransmit Timing V alues (50MHz REF_CLK IN) PARAMETER DES[...]

  • Page 58

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 58 SMSC LAN8720/LAN8720i DA T ASHEET 6.2.2 RMII 10Base-T TX/RX Ti mings (50MHz REF_CLK IN) 6.2.2.1 10M RMII Receive Timing (50MHz REF_CLK IN) Figure 6.4 10M RMII Re ceive Timing Diagram (50MHz REF_CLK IN) T able 6.4 10M RMII Receive Ti [...]

  • Page 59

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 59 Revision 1.0 (05-28-09) DA T ASHEET 6.2.2.2 10M RMII T ransmit T iming (50MHz REF_CLK IN) Figure 6.5 10M RMII T r ansmit Timing Diagram (50MHz REF_CLK IN) T abl e 6.5 10M RMII T rans mit Timing V alues (50MH z REF_CL K IN) PARAMETER DES[...]

  • Page 60

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 60 SMSC LAN8720/LAN8720i DA T ASHEET 6.3 RMII 10/100Base-TX/RX Ti mings (50MHz REF_CLK OUT) The 50MHz REF_CLK OUT timing app lies to the case when LED/nINTSEL is pulled-low on the LAN8720. In this mode, a 25MHz crystal or clock oscillat[...]

  • Page 61

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 61 Revision 1.0 (05-28-09) DA T ASHEET 6.3.1.2 100M RMII T ransmit Timing (5 0MHz REF_CLK OUT) Figure 6.7 100M RMII T ransmit Ti ming Diagram (50MHz R EF_CLK OUT) T able 6.7 100M RMII T ransmit Timing V alues (50MHz REF_CLK OUT) PARAMETER [...]

  • Page 62

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 62 SMSC LAN8720/LAN8720i DA T ASHEET 6.3.2 RMII 10Base-T TX/RX Timings (50MHz REF_CLK OUT) 6.3.2.1 10M RMII Receive Timing (50MHz REF_CLK OUT) Figure 6.8 10M RMII Receive Timi ng Diagram (50MHz REF_CLK OUT) T able 6.8 10M RMII Receiv e [...]

  • Page 63

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 63 Revision 1.0 (05-28-09) DA T ASHEET 6.3.2.2 10M RMII T ransmit T iming (50MHz REF_CLK OUT) 6.4 RMII CLKIN Requirement s Figure 6.9 10M RMII T ransmit Timi ng Diagram (50MHz REF_CLK OUT) T able 6.9 10M RMII T ra nsmit Timing V alu es (50[...]

  • Page 64

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 64 SMSC LAN8720/LAN8720i DA T ASHEET 6.5 Reset T iming Figure 6.10 Reset Timing Diagram T able 6.1 1 Reset Tim ing V alues PARAMETER DESCRIPTION MIN T YP MAX UNITS NOTES T1 1.1 Reset Pulse Width 100 us T1 1.2 Configurati on input setup [...]

  • Page 65

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 65 Revision 1.0 (05-28-09) DA T ASHEET 6.6 Clock Circuit LAN8720/LAN8720i can accept either a 2 5MHz cr ystal or a 25MHz single-ended clock oscillator (±50ppm) input. If the sin gle-ended clock osci llator method is implemented , XT AL2 s[...]

  • Page 66

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 66 SMSC LAN8720/LAN8720i DA T ASHEET Chapter 7 DC Electrical Characteristics 7.1 DC Characteristics 7.1.1 Maximum Guaranteed Ratings S tresses beyond those listed in may cause permanent damage to the device. Exposure to absolute maximum[...]

  • Page 67

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 67 Revision 1.0 (05-28-09) DA T ASHEET no change in operation or performanc e due to the event. All pins on the LAN8720 provid e +/-5kV HBM protection. 7.1.1.2 IEC61000-4-2 Performa nce The IEC61000-4-2 ESD specif icatio n is an interna ti[...]

  • Page 68

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 68 SMSC LAN8720/LAN8720i DA T ASHEET Note: The current at VDDCR is either suppl ied by th e internal regul ator from current entering at VDD2A, or fro m an external 1 .2V supply when the internal re gulator is disabl ed. Note 7.1 This i[...]

  • Page 69

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 69 Revision 1.0 (05-28-09) DA T ASHEET Note: The current at VDDCR is either suppl ied by th e internal regul ator from current entering at VDD2A, or fro m an external 1 .2V supply when the internal re gulator is disabl ed. Note 7.3 This is[...]

  • Page 70

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 70 SMSC LAN8720/LAN8720i DA T ASHEET 7.1.4 DC Characteristics - I nput and Output Buffers T able 7.6 RMII Bus Interface Signals NAME V IH (V) V IL (V) I OH I OL V OL (V) V OH (V) TXD0 0.68 * VDDIO 0.4 * VDDIO TXD1 0.68 * VDDIO 0.4 * VDD[...]

  • Page 71

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 71 Revision 1.0 (05-28-09) DA T ASHEET Note 7.5 These levels apply when a 0-3.3V Clock is driven into XT AL1/CL KIN and XT AL2 is floating. The maximum input voltage on XT AL1/CLKIN is VDD2A + 0.4V . T able 7.7 LAN Interface Signals NAME V[...]

  • Page 72

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 72 SMSC LAN8720/LAN8720i DA T ASHEET Note 7.6 Measured at the lin e side of the transformer , line replaced by 100 Ω (± 1%) resistor . Note 7.7 Offset from 16 nS pulse width at 50% of pulse peak Note 7.8 Measured differentially . Note[...]

  • Page 73

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 73 Revision 1.0 (05-28-09) DA T ASHEET Chapter 8 Application Notes 8.1 Application Diagram The LAN8720 requires few ex ternal components. T he voltage on the magnetics center tap can range from 2.5 - 3.3V . 8.1.1 RMII Diagram Figure 8.1 Si[...]

  • Page 74

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 74 SMSC LAN8720/LAN8720i DA T ASHEET 8.1.2 Power Supply Diagram 8.1.3 T wisted-Pair Interface Diagram Figure 8.3 High-Level System Diagram fo r Power Figure 8.5 Copper Interface Diagram LAN8720 24-QFN RBIAS 24 VSS 19 12k VDD1A nRST 15 C[...]

  • Page 75

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 75 Revision 1.0 (05-28-09) DA T ASHEET 8.2 Magnetics Selection For a list of magnetics selecte d to operate with the SMSC LAN8 720, please refer to the Ap plication note “AN 8-13 Suggested Magne tics”. http://www .smsc.com/main/appn ot[...]

  • Page 76

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 76 SMSC LAN8720/LAN8720i DA T ASHEET Chapter 9 Package Outline Notes: 1. Controlling Unit: millimeter . 2. Dimension b applies to plated termina ls and is measured between 0.15mm and 0.30mm from the terminal tip. T olerance on the true [...]

  • Page 77

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 77 Revision 1.0 (05-28-09) DA T ASHEET Figure 9.1 QFN, 4x4 T aping Dimensions a nd Part Orient ation[...]

  • Page 78

    Small Footprint R MII 10/100 Ethe rnet T ransceiver with HP A uto-MDIX Suppor t Datasheet Revision 1.0 (05-28-09) 78 SMSC LAN8720/LAN8720i DA T ASHEET Note: S tandard reel size is 4000 pieces per reel. Figure 9.2 Reel Dimensions[...]

  • Page 79

    Small Foot print RMII 10/10 0 Ethernet T ransceiver with HP Auto-M DIX Support Datasheet SMSC LAN8720/LAN8720i 79 Revision 1.0 (05-28-09) DA T ASHEET Chapter 10 Revision History T able 10.1 Customer R evision Hi story REVISION LEVEL & DATE SECTI ON/FIGURE /ENTRY CORRECTION Rev . 1.0 (05-28-09) Revised LAN8720 ordering informati on. Rev . 1.0 (0[...]