AM79C100JC Advanced Micro Devices, AM79C100JC Datasheet

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AM79C100JC

Manufacturer Part Number
AM79C100JC
Description
Twisted-pair Ethernet transceiver plus (TPEX Plus)
Manufacturer
Advanced Micro Devices
Datasheet

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Am79C100
Twisted-Pair Ethernet Transceiver Plus (TPEX Plus)
DISTINCTIVE CHARACTERISTICS
GENERAL DESCRIPTION
The Am79C100 Twisted-Pair Ethernet Transceiver Plus
(TPEX Plus) is an integrated circuit that implements the
medium attachment unit (MAU) functions for the
twisted-pair medium, as specified by the supplement to
the IEEE 802.3 standard (Type 10BASE-T). This de-
vice provides the necessary electrical and functional
interface between the IEEE 802.3 standard attachment
unit interface (AUI) and the twisted-pair cable.
A network based on the 10BASE-T standard can use
unshielded twisted-pair cables, providing an economi-
cal solution to networking by allowing the use of existing
telephone wiring. The Am79C100 provides a minimal
component count and a cost-effective solution to the
design and implementation of 10BASE-T standard
networks.
Publication# 16511
Issue Date: May 1994
CMOS device provides IEEE 802.3-compliant
operation and low operating current from a
single +5 V supply
Power Down mode for reduced power
consumption in battery-powered applications
Automatic twisted-pair link integrity
Pin-selectable twisted-pair receive polarity
detection and automatic inversion of the receive
signal. Polarity indication output pin can
directly drive an LED.
Pin-selectable twisted-pair link integrity test
capability conforming to the IEEE 802.3
standard. Link status pin can directly drive
an LED.
FINAL
Rev: B Amendment/0
TPEX Plus provides twisted-pair driver and receiver cir-
cuits, including on-board transmit digital predistortion,
receiver squelch, and an AUI port with pin-selectable
SQE Test enable. The device provides a number of ad-
ditional features, including Link Status indication with
automatic twisted-pair receive polarity detection/
correction and indication; pin-selectable receive
threshold programming for extended distance line
lengths; and Receive Carrier Sense, Transmit Active
and Collision Present indications. The device provides
separate twisted-pair Link Status, Polarity Status,
Receive, Transmit, and Collision outputs to drive LEDs
directly.
Transmit, receive, and collision status
indications available on separate, dedicated
pins
Outputs can directly drive LEDs with pulses
stretched to ensure LED visibility
Internal twisted-pair transmitter digital
predistortion circuit to reduce medium-induced
jitter
Pin-selectable SQE Test (heartbeat) enable
AUI loopback, Jabber Control, and SQE Test
functions comply with the 10BASE-T standard
User-selectable loopback operations
Pin-selectable twisted-pair receive threshold
programming for extended distance line lengths
1

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AM79C100JC Summary of contents

Page 1

FINAL Am79C100 Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) DISTINCTIVE CHARACTERISTICS CMOS device provides IEEE 802.3-compliant operation and low operating current from a single +5 V supply Power Down mode for reduced power consumption in battery-powered applications Automatic twisted-pair link integrity ...

Page 2

BLOCK DIAGRAM TEST1 TEST2 Line Receiver DO+ and Squelch DO– Circuit CI+ Line Driver CI– SQE TEST DI+ Line Driver DI– PRDN/RST REXT Attachment Unit Interface (AUI) RELATED AMD PRODUCTS Part No. Description Am7996 IEEE-802.3/Ethernet/Cheapernet Tap Transceiver Am79C90 CMOS Local ...

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CONNECTION DIAGRAM XMT LNKST COL AV SS DO+ LOGIC SYMBOL Attachment Unit Interface (AUI) PLCC ...

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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. AM79C100 DEVICE NUMBER/DESCRIPTION Am79C100 Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) Valid ...

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PIN DESCRIPTION AV DD Analog Power This pin supplies + analog portions of the TPEX Plus circuitry Analog Ground This pin is the ground reference for analog portions of TPEX Plus circuitry. CI+, CI– Control In ...

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In the LOW output state, the pin is capable of sinking a maximum and can be used to drive an LED. The RCV output is pulse stretched for after the end of ...

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FUNCTIONAL DESCRIPTION The Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) complies with the requirements specified by the IEEE 802.3 standard for the attachment unit interface (AUI) and the 10BASE-T standard for a twisted-pair medium attachment unit (MAU). TPEX Plus also imple- ...

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Link Fail, and will reverse the receive polarity based on both the polarity of any previous link beat pulses and the polarity of subsequent packets with a valid end transmit delimiter (ETD). ...

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Signal Quality Error (SQE) Test (Heartbeat) Function When the SQE TEST pin is driven LOW, TPEX Plus will routinely exercise the collision detection circuitry by generating an SQE Test message at the end of every transmission. This signal is a ...

Page 10

For these reasons crucial that the values and TXD+ TXP+ TXD– TXP– Am79C100 TPEX Plus RXD+ ...

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...

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Station/DTE Loopback Test Mode Note 1 XMT COL DO± DI± CI± TEST2 SQE TEST TEST1 HIGH HIGH Note: 1. During Loopback, the COL pin does not indicate collision, but instead provides indication of TXD ± /TXP ± activity. For details, ...

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AMD SYSTEM APPLICATIONS Am79C100 13 ...

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Table 1. TPEX Plus Compatible Media Interface Modules Manufacturer Part # Bel Fuse A556-2006-DE Bel Fuse 0556-2006-00 Bel Fuse 0556-2006-01 Valor Electronics PT3877 Valor Electronics PT3983 Valor Electronics FL1012 Nano pulse NP6612 Nano pulse NP6581 Nano pulse NP6696 TDK TLA ...

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AMD ABSOLUTE MAXIMUM RATINGS Storage Temperature Ambient Temperature Under Bias: Supply Voltage ( ...

Page 16

DC CHARACTERISTICS (continued) Parameter Symbol Parameter Description Twisted Pair Interface I Input Current at RXD IRXD R RXD Differential Input RXD Resistance V RXD+, RXD– Open Circuit TIVB Input Voltage (Bias) V Differential Mode Input TIDV Voltage Range (RXD ) ...

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AMD SWITCHING CHARACTERISTICS over COMMERCIAL operating ranges Parameter Symbol Parameter Description Transmit Timing t DO Pulse Width Accept/ PWODO Reject Threshold t DO Pulse Width Maintain/ PWKDO Turn-Off Threshold t Transmit Start Up Delay TON t Transmit Static Propagation TSD ...

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SWITCHING CHARACTERISTICS (Continued) Parameter Symbol Parameter Description Receive Timing t RXD Pulse Width Maintain/ PWKRD Turn-Off Threshold t Receiver Start Up Delay RON (RXD First Validly Timed Bit RVB Receiver Static Propagation RSD ...

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AMD SWITCHING TEST CIRCUITS DV DD 294 TXD+ TXD– 294 100 pF Includes test jig capacitance DV SS DI+ DI– CI+ CI– TXP+ Test Point TXP– Includes test jig capacitance 16511B-8 Twisted Pair Transmit Test Circuit AV DD 52.3 Test ...

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KEY TO SWITCHING WAVEFORMS 20 WAVEFORM INPUTS Must be Steady May Change from May Change from Don’t Care, Any Change Permitted Does Not Apply Am79C100 OUTPUTS Will be Steady Will be Changing from H ...

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AMD SWITCHING WAVEFORMS t PWODO DO± V ATH+ V ASQ(min) V ASQ(max) t PWKDO TXD+ TXP+ t THDP TXD- t TON TXP- t XMTON XMT t DODION DI± TXD+ TXP+ TXD- TXP- t PWLP V ATH TLDP ...

Page 22

SWITCHING WAVEFORMS RXD± t RON DI+ DI– t RCVON RCV RXD± RXD± PWKRD V TSQ– RHD RLD RF Receive Timing Receive Thresholds Am79C100 AMD t PWKRD V TSQ RETD t ...

Page 23

AMD SWITCHING WAVEFORMS DO± RXD± CI+ CI– t COLON COL DO± CI+ CI– COL = 1 t CON t CPW Collision Timing t SQED SQE Test Timing Am79C100 t COFF t COLOFF t CPER 16511B-15 t SQEL 16511B-16 23 ...

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... Copyright © 1998 Advanced Micro Devices, Inc. All rights reserved. AMD, the AMD logo, and combinations thereof are trademarks of Advanced Micro Devices, Inc. Am186, Am386, Am486, Am29000, b IMR, eIMR, eIMR+, GigaPHY, HIMIB, ILACC, IMR, IMR+, IMR2, ISA-HUB, MACE, Magic Packet, PCnet, PCnet- FAST , PCnet- FAST +, PCnet-Mobile, QFEX, QFEXr, QuASI , QuEST, QuIET, TAXIchip, TPEX, and TPEX Plus are trademarks of Advanced Micro Devices, Inc ...

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