Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

AM79C98 Datenblatt(PDF) 9 Page - Advanced Micro Devices

Teilenummer AM79C98
Bauteilbeschribung  Twisted-Pair Ethernet Transceiver (TPEX)
Download  22 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C98 Datenblatt(HTML) 9 Page - Advanced Micro Devices

Back Button AM79C98 Datasheet HTML 5Page - Advanced Micro Devices AM79C98 Datasheet HTML 6Page - Advanced Micro Devices AM79C98 Datasheet HTML 7Page - Advanced Micro Devices AM79C98 Datasheet HTML 8Page - Advanced Micro Devices AM79C98 Datasheet HTML 9Page - Advanced Micro Devices AM79C98 Datasheet HTML 10Page - Advanced Micro Devices AM79C98 Datasheet HTML 11Page - Advanced Micro Devices AM79C98 Datasheet HTML 12Page - Advanced Micro Devices AM79C98 Datasheet HTML 13Page - Advanced Micro Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 22 page
background image
Am79C98
9
standard is generated at a transmitter and passed
through 100 m of twisted-pair cable.
The polarity detection/correction algorithm will remain
“armed” until two consecutive packets with valid ETD of
identical polarity are detected. When “armed,” the re-
ceiver is capable of changing the initial or previous
polarity configuration based on the most recent ETD
polarity.
On receipt of the first packet with valid ETD following
reset or Link Fail, TPEX will utilize the inferred polarity
information to configure its RXD
± input, regardless of
its previous state. On receipt of a second packet with a
valid ETD with correct polarity, the detection/correction
algorithm will “lock in” the initial polarity. If the second
(or subsequent) packet is not detected as confirming
the previous polarity decision, the most recently de-
tected ETD polarity will be used as the new default.
Note that packets with invalid ETD have no effect on
updating the previous polarity decision. Once two con-
secutive packets with valid ETD have been received,
TPEX will disable the detection/correction algorithm
until either a Link Fail condition occurs or PRDN/RST is
asserted.
During polarity reversal, the RXPOL pin is internally
pulled HIGH. During normal polarity conditions, the
RXPOL pin is driven LOW and is capable of directly
driving a “Polarity OK” LED using an integrated 16 mA
driver. If desired, the polarity reversal function can be
disabled by grounding the RXPOL pin.
Twisted-Pair Interface Status
Two outputs (XMT and RCV) indicate whether TPEX is
transmitting (AUI to twisted-pair) or receiving (twisted-
pair to AUI). Both signals are asserted during a colli-
sion. In Link Fail mode, RCV is disabled. In Jabber
Detect mode, XMT is disabled. Both signals are active
HIGH.
Collision Detect Function
Simultaneous carrier sense (presence of valid data sig-
nals) by both the AUI DO+/– pair and the RXD+/– pair
constitutes a collision, thereby causing a 10 MHz signal
to be asserted on the CI+/– output pair. The CI+/– output
meets the drive requirements for the AUI. This 10 MHz
signal will remain on the CI+/– pair until one of the two
colliding states changes from active to idle. The CI+/–
output pair stays HIGH for two bit times at the end of a
collision, decreasing to the idle level within eighty bit
times after the last LOW-to-HIGH transition. Both the
XMT and RCV pins are driven HIGH during collision.
Signal Quality Error (SQE) Test (Heartbeat)
Function
When the SQE TEST pin is driven LOW, TPEX will
routinely exercise the collision detection circuitry by
generating an SQE message at the end of every trans-
mission. This signal is a self-test indication to the DTE
that the MAU collision circuitry is functional. An SQE
message consists of a 10 MHz signal on the CI+/–
pair with a duration of 8 bit times (800 ns). When en-
abled, an SQE Test will occur at the end of every trans-
mission, starting eight bit times (800 ns) after the last
transition of the transmitted signal. For repeater appli-
cations, the SQE Test function can be disabled by tying
the SQE TEST pin HIGH or by leaving it disconnected.
Jabber Function
The Jabber function inhibits the twisted-pair transmit
function of TPEX if the DO+/– circuit is active longer
than the time permitted to transmit the maximum-
length 802.3/Ethernet data packet (50 ms nominal).
This prevents any one node from disrupting the net-
work due to a “stuck on” or faulty transmitter. If this
maximum transmit time is exceeded, TPEX transmitter
circuitry is disabled and a 10 MHz signal is driven onto
the CI+/– pair. Once the transmit data stream is re-
moved from the DO+/– pair of inputs, an “unjab” time of
250 ms to 750 ms will elapse before TPEX removes the
10 MHz signal from the CI+/– pair and re-enables the
transmit path.
Power Down
In addition to on-board power-on-reset circuitry, the
PRDN/RST pin is used as the master reset for TPEX.
PRDN/RST must be driven LOW for a minimum of two
microseconds for reset to occur. The PRDN/RST pin
can also be used to put the TPEX into an inactive state,
causing the device to consume less power. This feature
is useful in battery-powered or low-duty-cycle systems.
Driving PRDN/RST LOW resets the internal logic of
TPEX and places the device into idle mode. In this
mode, the twisted-pair driver pins (TXD+/–,TXP+/–)
are driven LOW, the AUI pins (CI+/–, DI+/–) are driven
HIGH, the LNKST and RXPOL pins are in the inactive
state, and XMT and RCV are LOW. TPEX will remain in
idle as long as PRDN/RST is asserted. Following the
rising edge of the signal on PRDN/RST, TPEX will re-
main in the reset state for 10
µs.
Test Modes
TPEX implements two types of loopback test modes
suitable for Station (DTE) or Repeater applications.
The Test mode is entered by driving the TEST pin
HIGH. The two types of test modes available are:
1. Station (DTE): SQE TEST pin LOW. Data on DO+/–
pair is transmitted onto the TXD+/– and TXP+/–
pairs and data on the RXD+/– input pair is transmit-
ted onto the DI+/– output pair. The jabber function
and collision detection functions are disabled.
2. Repeater: SQE TEST pin HIGH. Data on DO+/–
pair is looped back onto the DI+/– pair and data on
the RXD+/– pair is retransmitted on the twisted-pair
drivers (TXD+/– and TXP+/– pairs).


Ähnliche Teilenummer - AM79C98

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Pulse A Technitrol Comp...
AM79C98 PULSE-AM79C98 Datasheet
253Kb / 12P
   LAN DISCRETE TRANSFORMER MODULES
G003.U 2/07
logo
Advanced Micro Devices
AM79C981 AMD-AM79C981 Datasheet
347Kb / 40P
   Integrated Multiport Repeater Plus??(IMR??
logo
Pulse A Technitrol Comp...
AM79C981 PULSE-AM79C981 Datasheet
253Kb / 12P
   LAN DISCRETE TRANSFORMER MODULES
G003.U 2/07
logo
Advanced Micro Devices
AM79C981JC AMD-AM79C981JC Datasheet
347Kb / 40P
   Integrated Multiport Repeater Plus??(IMR??
AM79C982 AMD-AM79C982 Datasheet
254Kb / 26P
   basic Integrated Multiport Repeater (bIMR)
More results

Ähnliche Beschreibung - AM79C98

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Advanced Micro Devices
AM79C100 AMD-AM79C100 Datasheet
208Kb / 24P
   Twisted-Pair Ethernet Transceiver Plus (TPEX Plus)
logo
Level One
LXT906 LVL1-LXT906 Datasheet
750Kb / 10P
   Ethernet Twisted-Pair/Coax Adapter
LXT902 LVL1-LXT902 Datasheet
404Kb / 14P
   Ethernet Twisted-Pair Media Attachment Unit
logo
ON Semiconductor
NCN51206GEVB ONSEMI-NCN51206GEVB Datasheet
460Kb / 55P
   Transceiver for KNX Twisted Pair Networks
October, 2015 ??Rev. 6
NCN5120 ONSEMI-NCN5120_15 Datasheet
460Kb / 55P
   Transceiver for KNX Twisted Pair Networks
October, 2015 ??Rev. 6
NCN5130 ONSEMI-NCN5130_16 Datasheet
469Kb / 58P
   Transceiver for KNX Twisted Pair Networks
September, 2016 ??Rev. 3
NCN5120 ONSEMI-NCN5120 Datasheet
418Kb / 54P
   Transceiver for KNX Twisted Pair Networks
April, 2013 ??Rev. 2
NCN5110 ONSEMI-NCN5110_16 Datasheet
289Kb / 24P
   Transceiver for KNX Twisted Pair Networks
September, 2016 ??Rev. 1
logo
National Semiconductor ...
DP83220 NSC-DP83220 Datasheet
136Kb / 10P
   CDL Twisted Pair FDDI Transceiver Device
logo
ON Semiconductor
NCN5121 ONSEMI-NCN5121_16 Datasheet
466Kb / 58P
   Transceiver for KNX Twisted Pair Networks
September, 2016 ??Rev. 1
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com