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82555 10/100 Mbps LAN Ph ysical La y e r Inter face Networking Sili con Datasheet Product Features ■ Optimal in tegration for lower cost solutions — Integrated 10/100 Mb ps single chip physical la.
82555 — Networking Silicon ii Datasheet Re vi s ion His t ory ■ Low po wer consumptio n — T ypical total solution p o wer includi ng all resistors and magnetics: - 275 mA 100B ASE-TX - 230 mA 10.
Datasheet iii Networking Silicon — 82555 Cont ents 1.0 INTRODUCTION ................... ............. .................... ............ .................... ............. ............... .......... 1 1.1 Functiona l Overview . ............. ........
82555 — Networking Silicon iv Datasheet Contents 5.3.3 10BASE-T Error Detectio n and Reporti ng ......... ............. .................... ....... 22 5.4 10BASE- T Collision Detec tion.. .................... ............ .................... .....
Datasheet 1 Networking Silicon — 82555 1.0 In tr oduc tion The 82555 is a h ighly inte grated, phy sical layer interface solutio n designed for 1 0 and 100 Mbps Ethernet systems based on the IEEE 10B ASE-T and 100B ASE-TX specif icatio ns. 100B ASE-TX i s an IEEE 802.
82555 — Net working Silicon 2 Datasheet The 82555 also complies with the IEEE 802.3u Auto-Ne gotiation and the IEEE 802.3x Full Duple x Flo w Control sections. Th e MA C interface on the 825 55 is a supers et of the IEEE 802.3u Media Independent In terface (MI I) standard.
Datasheet 3 Networking Silicon — 82555 2.0 Arc hitectural Over view The 82555 is an adv anced co mbination of both di gital and analog logic which combine to p rovide a functional stack between the Med ia Independent In terface (MII) an d the wire through the magnetics.
82555 — Net working Silicon 4 Datasheet • Receiv e: The 82555 takes recei ve analog ML T -3 data from the recei ve dif ferential pair and con verts it into a di gital 12 5 Mbps st ream, reco vering bot h clock an d data signals. 2.2 10 Mbps M ode The 82555 o perat i on in 1 0B ASE-T mode is similar to th e 82555 operation in 100BAS E-TX m ode.
Datasheet 5 Networking Silicon — 82555 The 82555 p rovides a g lueless interfa ce to Intel componen ts such as the 82557 Fast E thernet Controller , as well as any MII compati ble device. Figure 4 shows a sch ematic-lev el diagram of the 82557 F as t Ethernet co ntroller implemen tation connected to the 8 2555 using the MI I interface.
82555 — Net working Silicon 6 Datasheet TXERR T ransmit Error (repeater mode only) From RIC TXC Y es T able 1. 82 555 MII Signal Name Description Direction Cloc k Reference MII Si gnal Supported by .
Datasheet 7 Networking Silicon — 82555 3.0 Pin Definitio ns All acti ve digital pins are defined to hav e tran sist or-to-transistor logic voltage le vels e xcept the X1 and X2 crystal signals. The transmit dif ferential and receiv e dif ferential pins are specif ied as analog output s and i nputs, r especti vel y .
82555 — Net working Silicon 8 Datasheet Pin allo cation is based o n a 100-l ead quad fl at package. Al l pin locations are base d on prin ted circuit board lay out and o ther desi gn const raints. 3.1 Pin T ypes 3.2 C lock Pins 3.3 T wisted P air Ethernet (TPE) Pins 3.
Datasheet 9 Networking Silicon — 82555 3.5 Media Access Contr ol/Repeater Interface Contr ol Pins RXC 90 O Receive Cloc k. The Receive Cloc k may be either 25 MHz or 2.5 MHz depending on the 82555’s operating speed (25 MHz for 100 Mbps and 2.5 MHz for 10 Mbps).
82555 — Net working Silicon 10 Datasheet 3.6 LED Pins 3.7 External Bias Pins Note: The resistor v al ues described for the ex ternal bias pins are on ly recommended v alues and may requir e to be f ine tuned fo r v arious desi gns. TXRD Y (T OUT) 4 O This pin is multiple xed and can be used f or one of the f ollowing: T ransmit Ready .
Datasheet 11 Networking Silicon — 82555 3.8 Miscellaneous Contr ol Pins Symbol Pin T yp e Name and Function RESE T 1 I Reset. The Reset signal is activ e high and resets the 82555. A reset pulse width of at least 1 µ s should be used. FRC100 (MACTYP) 51 I T his pin is multiple xed and can be used for one of the follo wing: Force 1 00/10 Mbps.
82555 — Net working Silicon 12 Datasheet 3.9 P o wer and Ground Pins Symbol Pin T ype Name and Function VCC 7, 9, 15, 17, 19, 27, 29, 31, 36, 38, 40, 45, 58 , 62, 64, 66, 73, 75, 83, 88, 93, 98 I P .
Datasheet 13 Networking Silicon — 82555 4.0 100B ASE-TX A dapter Mode Operatio n 4.1 100B ASE-TX T ransmit Cloc k Generation A 25 MHz crystal or a 25 MHz oscillator is used to dri ve the 8255 5’ s X1 and X2 pi ns. The 82555 deriv es its internal trans mit digit al clocks from this crys tal or oscillator inpu t.
82555 — Net working Silicon 14 Datasheet 4.2.2 100B A SE-TX Scramb ler and ML T -3 Encoder Data is s crambled i n 100B ASE-TX in o rder to red uce electromagnetic em issi ons during long transmissions of high-frequen cy data codes.
Datasheet 15 Networking Silicon — 82555 maintained (either p ositiv e, n eg ativ e o r zero). When an NR Z “1” arri v es at th e input of the encoder , the ou tput ste ps to the next le vel. The orde r of steps is negative-zero- posit iv e- zero wh ich co ntinues periodically .
82555 — Net working Silicon 16 Datasheet 4.2 .4 T ran smi t D riv er The transmit dif ferential lines are implemented with a d igital slope cont rolled current dri ver that meets the TP-PMD sp eci fications. Current is s unk from the isolation transfo rmer by the transmit differential pins.
Datasheet 17 Networking Silicon — 82555 4.3.1 Adaptive Equaliz er The distorted ML T -3 signal at the end of the wire is restored b y the equalizer . The equalizer performs adaptation based on the shape of the recei ved signal, equalizin g the signal to meet superior Data Dependent Jitter p e rformance.
82555 — Net working Silicon 18 Datasheet 4.5 100BASE -TX Link Integrity and Au to-Negotiation Solution The 82555’ s Auto-Negotiation func tio n automati cally co nfigures the device to the technology , media, and speed to operate with its link partner .
Datasheet 19 Networking Silicon — 82555 The figure belo w illustrates an 8255 7/82 555/PHY -T4 solutio n in a block diagram . 4.6 A uto 10/100 Mbps Speed Se lection The MA C may either allow the 82555 to automatically select i ts operating speed or force the 82 555 into 10 Mbps or 100 Mbps mode.
82555 — Net working Silicon 20 Datasheet.
Datasheet 21 Networking Silicon — 82555 5.0 10B ASE-T F unctionality in Adapter Mod e 5.1 10B ASE-T T ransmit Clock Generation The 20 MHz and 10 MHz clocks n eeded for 1 0B ASE-T are synthesized from th e e xtern al 25 MHz crystal or oscillator . The 82555 pro vides the transmit clock and recei ve clock to the MA C at 2.
82555 — Net working Silicon 22 Datasheet T wisted Pair Ethernet ( TPE) recei ver is greater than 585 mV and less than 3.1 V . The TP E recei ve buf fer disti nguish es valid recei ve data, link test pulses, and the idle condition, according to the requirement s of th e 10BAS E-T standa rd.
Datasheet 23 Networking Silicon — 82555 5.7 10B ASE-T Full D uplex The 82555 s uppor ts 10 Mbps full dupl ex by di sabling the collision f unction, the sq uelch test , and the carrier sense transmit function. This allows the 82555 to transm it and recei ve simultaneously , achie ving up t o 20 Mbps of netw ork bandwi dth.
82555 — Net working Silicon 24 Datasheet.
Datasheet 25 Networking Silicon — 82555 6.0 Repeater Mode The 82555 h as a compete set of r epeater features makin g it the ideal PHY for Class 1 ( MII) repeater designs.
82555 — Net working Silicon 26 Datasheet PHYs connected to the RIC. Signals TXEN, CRS, and P OR TEN are connected from each of th e 82555 devices to the specified RIC pin . The fi gure below illustrates an example of multipl e 82555s connected to a 25 M Hz (or 2.
Datasheet 27 Networking Silicon — 82555 7.0 Management Data Interface The 82555 p rovides status a nd accepts managem ent information thro ugh the Managemen t Data Interface (MDI) . This is accomplished through read and write operations to v arious registers in accordance with the IEEE 802.
82555 — Net working Silicon 28 Datasheet The 82555 addres s can be conf igured to four 0 th rou gh 3 in DTE (adapter) mode and 0 throug h 31 in repeater mode. A special functions f o r swit ches allo ws 32 addresses to exist in rep eater mode. The management fram e structure is as follo w s: 7.
Datasheet 29 Networking Silicon — 82555 7.2.1.2 Regis ter 1: St atus Register Bit Defi nitions 11 P ower-Down This bit sets the 82555 int o a lo w pow er mode. 1 = P ower-down enab led 0 = P ower-down di sabled (normal operation) 0R W 10 Isolate This bit allows the 82555 to electr ically isolate the Media Independent Interf ace.
82555 — Net working Silicon 30 Datasheet 7.2.1.3 Register 2: 82555 Id enti fier Register Bit Definitions 7.2.1.4 Register 3: 82555 Id enti fier Register Bit Definitions 7.
Datasheet 31 Networking Silicon — 82555 7.2.1.6 Regis ter 5: A uto-Negotiat ion Link P artner Ability Regi ster Bit Definitio ns 7.2.1.7 Regis ter 6: A uto-Negot iat ion Expansion Register Bit Definitions 7.2. 2 MD I Regist ers 8 - 15 Register s eight through f ifteen are reserv ed for IEEE.
82555 — Net working Silicon 32 Datasheet 7.2.3.1 Register 16: 82555 Sta tus and Contr ol Register Bit Definitions 7.2.3.2 Register 17: 82555 Special Contr ol Bit Definitions Bit(s) Name Description Default R/W 15 Flow Cont rol This bit enabl es PHY Base (Bay T echnologies) flow control.
Datasheet 33 Networking Silicon — 82555 7.2.3.3 Regis ter 20: 10 0B ASE-TX Receive Disconnect Counter Bit Definition s 7.2.3.4 Regis ter 21: 10 0B ASE-TX Receive Erro r Frame Counte r Bit Definition.
82555 — Net working Silicon 34 Datasheet 7.2.3.5 Register 22: Receive Symbol Err or Counter Bit Definitions 7.2.3.6 Register 23: 100B ASE-TX Receive Premature End of Frame Err o r Count er Bit Definitions 7.2.3.7 Register 24: 10B ASE-T Receive End of Frame Error Counter Bit Definitions 7.
Datasheet 35 Networking Silicon — 82555 8.0 A u to-Negoti ation Function ality The 82555 s uppor ts Auto-Ne gotiation. Au to-Ne gotia tion is a scheme of au to-confi guratio n designed to man ag e interoperability in multifu nct ional LAN en v ironments.
82555 — Net working Silicon 36 Datasheet T o detect the correct technology , the two re gister fields should be ANDed tog ether to obtain the highest com mon deno minator . This v alue should then be us ed to map into a priority resoluti on table used by th e MA C dri ver to use the approp riate technology .
Datasheet 37 Networking Silicon — 82555 Negotiation or Parallel Detection with no data packets be in g transmitted. Co nnection is th en establ ished eit her by FLP exchange o r Pa rallel Detect ion. T he 82555 wi ll look for both FLPs and link integrity pulses.
82555 — Net working Silicon 38 Datasheet.
Datasheet 39 Networking Silicon — 82555 9.0 LED Descriptions The 82555 s uppor ts four LED pins to indicate li nk status , netw ork acti vity and network speed. • Link : This LED is of f (logic hi gh) unti l a v alid link has been detected. Aft er a v alid link has been detected, the LED will remain on (active- low).
82555 — Net working Silicon 40 Datasheet.
Datasheet 41 Networking Silicon — 82555 10.0 Reset and Miscella neous T est Modes 10.1 Reset When the 82555 R ESET signal is asserted (high), all internal circu its are reset. TXC and RXC should run continuousl y e ven though RESET is acti ve. The 825 55 may also b e reset through t he MDI reset bit.
82555 — Net working Silicon 42 Datasheet The TOUT pin is controlled by dif ferent sources according to the active te st instruction. The TOUT signal is acti vated by the f alling edge of TCK. The T AP must be reset during po wer-up. Otherwise, the 82555 can w ake-up during h igh-Z mode or N AND T est, which can be harmful to th e board.
Datasheet 43 Networking Silicon — 82555 11.0 Electrical Specifications and T iming P aram eters 11.1 Absolute Maxim um Ratings 11.2 General Operating Conditions 11.
82555 — Net working Silicon 44 Datasheet 11.3.3 100B ASE-TX V o ltage/ Current D C Charac teristics V ID A10 Input diff erential accept vol t age 5 MHz ≤ f ≤ 10 MHz ±585 ±3100 mV P V IDR10 Inp.
Datasheet 45 Networking Silicon — 82555 11.4 A C Characteristics 11.4.1 MII Cloc k Specifi cations I CC100 c Current on all V CC pins 235 mA I CCT100T O T T otal supply current 275 mA a. Transmi tter curr ent is m easure d with a 1:1 tra nsformer on the cen ter tap .
82555 — Net working Silicon 46 Datasheet 11.4.2 MII Timing P arameters Figure 14. MII Clocks A C Timing T1,T2,T3 1.5V T4,T5,T6 T4,T5,T6 Symbol P aram eter Condi tions Min T yp Max Units T7 T TXDV TX.
Datasheet 47 Networking Silicon — 82555 11.4.3 Repeater Mode Timing P arameters Figure 16. MII Receive Timing P arameters Figure 17. M II Timing P arameters: MDC/MDIO T9 T10 RXCLK RXD[3:0], RXER,RXD.
82555 — Net working Silicon 48 Datasheet 11.4.4 T ransm it P acke t Timing P arameter s 11.4.5 Squelch T est Timing P a rameters Symbol Parameter Condi tions Min T yp Max Units T15 T XEN_S T TXC on first TXEN activ e to st art of frame 100 Mbps 10 12 bi ts T15a T XEN_ ST TXC on first TXEN active to st art of frame 10 Mbps 3.
Datasheet 49 Networking Silicon — 82555 11.4.6 Jabber Timing P arameter s 11.4.7 Receive P acket Tim ing Pa rameter s Figure 20. Squelch T e st Timing P a rameters TXEN COL TXCLK T20 T21 Symbol Para.
82555 — Net working Silicon 50 Datasheet 11.4.8 10BASE -T Normal Link Pulse (NLP) Timing P arameter s 11.4.9 Auto-Negotiation F ast Link Pulse (FLP) Timing P arameters T26a T R_CR SL End of receive frame to fall ing edge of CRS 10 Mbps 4.
Datasheet 51 Networking Silicon — 82555 11.4.10 Reset Timing P arameters 11.4.11 X1 Clock Spe c ifications T33 T FLP_B UR_NUM Number of pulses in one burst 17 33 T34 T FLP_B UR_WID FLP Burst width 2 ms T35 T FLP_BUR_PER FLP burst period 8 24 ms Symbol P arameter Conditions Min T yp Max Units Figure 24.
82555 — Net working Silicon 52 Datasheet 11.4.12 100B A SE-TX T ransmitter A C Specificati on Figure 26. X1 Clock Specifications T38 2.5V T39 T39 0.4V 4.
Datasheet 53 Networking Silicon — 82555 12.0 82555 P ac kag e Inf ormation This sectio n provides the ph ysical pac kaging info rmation for the 82555. T he 82555 is an 100- pin plastic Quad Flat Pack (QFP) de vice. P ackage attribu tes are provided in Ta b l e 7 and the dimens ions are sho wn in Figure 2 7 .
82555 — Net working Silicon 54 Datasheet T Lead Angle 0.0 - 10.0 Y Coplanar ity - - 0.10 T able 7. Dime nsions for the 82555 QFP Symbol Description Min Norm Max.
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