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Part: AM79C874
Category:
Description:
Company: Advanced Micro Devices, Inc.
Datasheet: Download AM79C874 datasheet File size : 1108 kB
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PRELIMINARY
Am79C874
NetPHYTM-1LP Low Power 10/100-TX/FX Ethernet Transceiver
DISTINCTIVE CHARACTERISTICS
s 10/100BASE-TX Ethernet PHY device with 100BASE-FX fiber optic support s Typical power consumption of 0.3 W s Sends/receives data reliably over cable lengths greater than 130 meters s MII mode supports 100BASE-X and 10BASE-T s 7-Wire (General Purpose Serial Interface (GPSI)) mode supports 10BASE-T s Three PowerWiseTM management modes (from 300 mW typical) -- Power down: only management responds Typical power = 3 mW -- Unplugged: no cable, no receive clock Typical power = 100 mW -- Idle wire: no wire signal, no receiver power Typical power = 285 mW; MAC saves over 100 mW s Supports 1:1 or 1.25:1 transmit transformer -- Using a 1.25:1 ratio saves 20% transmit power consumption -- No external filters or chokes required s Waveshaping no external filter required s Full and half-duplex operation with full-featured Auto-Negotiation function s LED indicators: Link, TX activity, RX activity, Collision, 10 Mbps, 100 Mbps, Full or Half Duplex s MDIO/MDC operates up to 25 MHz s Automatic Polarity Detection s Built-in loopback and test modes s Single 3.3-V power supply with 5-V I/O tolerance s 12 mm x 12 mm 80-pin TQFP package s Support for industrial temperature (-40°C to +85°C)
GENERAL DESCRIPTION
The Am79C874 NetPHY-1LP device provides the physi c a l (PHY) layer and transceiver functions for one 10/100 Mbps Ethernet port. It delivers the dual benefits of CMOS low power consumption and small package size. Operating at 3.3 V, it consumes only 0.3 W. Three power management modes provide options for even lower power consumption levels. The small 12x12 mm 80-pin PQL package conserves valuable board space on adapter cards, switch uplinks, and embedded Ethernet applications. The NetPHY-1LP 10/100 Mbps Ethernet PHY device is IEEE 802.3 compliant. It can receive and transmit data reliably at over 130 meters. It includes on-chip input filtering and output waveshaping for unshielded twisted p a i r operation without requiring external filters or chokes. The NetPHY-1LP device can use 1:1 isolation transfor mers or 1.25:1 isolation transformers. 1.25:1 i s o l a t i o n transformers provide 20% lower transmit power consumption. A PECL interface is available for 100BASE-FX applications. Interface to the Media Access Controller (MAC) layer is established via the standard Media Independent Interface (MII), a 5-bit symbol interface, or a 7-wire (GPSI) in te rfa ce. Auto-Negotiation determines the network speed and full or half-duplex operation. Automatic polarity correction is performed during Auto-Negotiation and during 10BASE-T signal reception. Multiple LED pins are provided for front panel status feedback. One option is to use two bi-color LEDs to show when the device is in 100BASE-TX or 10BASE-T m o d e (by illuminating), Half or Full Duplex (by the color), and when data is being received (by blinking). Individual LEDs can indicate link detection, collision detection, and data being transmitted. The NetPHY-1LP device needs only one external 25MHz oscillator or crystal because it uses a dual-speed clock synthesizer to generate all other required clock domains. The receiver has an adaptive equalizer/DC restoration circuit for accurate clock/data recovery from the 100BASE-TX signal. The NetPHY-1LP device is available in the commercial (0°C to +70°C) or industrial (-40°C to +85°C) temperature ranges. The industrial temperature range is well suited to environments, such as enclosures with restricted air flow or outdoor equipment.
Refer to AMD's Website (www.amd.com) for the latest information.
Publication# 22235 Rev: I Amendment/0 Issue Date: April 2001
PRELIMINARY
BLOCK DIAGRAM
PCS Framer Carrier Detect 4B/5B MII Data Interface Interface MAC MDC/MDIO
PMA Clock Recovery Link Monitor Signal Detect
TP_PMD MLT-3 BLW Stream Cipher 25 MHz 10TX
100TX TX+ 100RX Mux TX-
10BASE-T
10RX
RX+ RX-
Transformer
Control/Status
20 MHz RX FLP
MII Serial Management Interface and Registers
PLL Clk Generator Test LED Control
25 MHz
AutoNegotiation
PHYAD[4:0]
XTL+ XTL-
CLK
TEST LED Drivers
22235I -1
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Am79C874
PRELIMINARY
CONNECTION DIAGRAM
TVCC2 TVCC1 TXTX+ TGND2 XTL+ XTLREFVCC IBREF REFGND FXTFXT+ TEST2 TEST1/FXR+ TEST0/FXREQGND RX+ RXTEST3/SDI+ RPTR 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 PCSBP ISODEF ISO TGND1 REFCLK CLK25 BURN_IN RST PWRDN PLLVCC PLLGND OGND1 OVDD1 PHYAD[4]/10RXDPHYAD[3]/10RXD+ PHYAD[2]/10TXD++ PHYAD[1]/10TXD+ PHYAD[0]/10TXDGPIO[0]/10TXD--/7Wire GPIO[1]/TP125 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 EQVCC ADPVCC LEDDPX/LEDTXB LEDSPD[1]/LEDTXA/CLK25EN ANEGA TECH_SEL[0] TECH_SEL[1] TECH_SEL[2] CRVVCC CRVGND OGND2 OVDD2 LEDLNK/LED_10LNK/LED_PCSBP_SD LEDTX/LEDBTB LEDRX/LEDSEL LEDCOL/SCRAM_EN LEDSPD[0]/LEDBTA/FX_SEL INTR CRS/10CRS COL/10COL Am79C874
NetPHY-1LP
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
MDIO MDC RXD[3] RXD[2] RXD[1] RXD[0]/10RXD VDD1 DGND1 RX_DV RX_CLK/10RXCLK RX_ER/RXD[4] TX_ER/TXD[4] TX_CLK/10TXCLK/PCSBP_CLK TX_EN/10TXEN DGND2 VDD2 TXD[0]/10TXD TXD[1] TXD[2] TXD[3]
22235I -2
Am79C874
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PRELIMINARY
ORDERING INFORMATION Standard Products
AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed by a combination of the elements below. AM79C874 V C/I
ALTERNATE PACKAGING OPTION Not Applicable
TEMPERATURE RANGE C = Commercial (0°C to +70°C) I = Industrial (-40°C to +85°C) PACKAGE TYPE V = 80-Pin Thin Plastic Quad Flat Pack (PQT 80) SPEED OPTION Not Applicable
DEVICE NUMBER/DESCRIPTION Am79C874 NetPHY-1LP Low Power 10/100-TX/FX Ethernet Transceiver
Valid Combinations AM79C874 AM79C874 VC VI
Valid Combinations Valid Combinations list configurations planned to be suppor ted in volume for this device. Consult the local AMD sales office to confirm availability of specific valid combinations and to check on newly released combinations.
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Am79C874
PRELIMINARY
RELATED AMD PRODUCTS
Part No. Controllers Am79C90
Description
CMOS Local Area Network Controller for Ethernet (C-LANCETM)
Integrated Controllers Am79C940 Am79C961A Am79C965A Am79C970A Am79C973/ Am79C975 Am79C976 Am79C978 Media Access Controller for Ethernet (MACETM) PCnetTM-ISA II Full Duplex Single-Chip Ethernet Controller for ISA Bus PCnetTM-32 Single-Chip 32-Bit Ethernet Controller for 486 and VL Buses PCnetTM-PCI II Full Duplex Single-Chip Ethernet Controller for PCI Local Bus PCnetTM-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY PCnetTM-PRO 10/100 Mbps PCI Ethernet PCI Controller PCnetTM-Home Single-Chip 1/10 Mbps PCI Home Networking Controller
Physical Layer Devices (Single-Port) Am79C901 HomePHYTM Single-Chip 1/10 Mbps Home Networking PHY
Physical Layer Devices (Multi-Port) Am79C875 NetPHYTM-4LP Low Power Quad10/100-TX/FX Ethernet Transceiver
Integrated Repeater/Hub Devices Am79C984A Am79C985 Enhanced Integrated Multiport Repeater (eIMRTM) Enhanced Integrated Multiport Repeater Plus (eIMR+TM)
Am79C874
5
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