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參數資料
| 型號： | AM7996PCTR |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | IEEE 802.3/Ethernet/Cheapernet Transceiver |
| 中文描述： | 電機及電子學工程師聯合會802.3/Ethernet/Cheapernet收發器 |
| 文件頁數： | 1/18頁 |
| 文件大小： | 179K |
| 代理商： | AM7996PCTR |
FINAL
Publication#
07506
Issue Date:
May 1994
Rev:
E
Amendment/
0
1
Am7996
IEEE 802.3/Ethernet/Cheapernet Transceiver
DISTINCTIVE CHARACTERISTICS
Compatible with Ethernet Version 2 and
IEEE 802.3 10BASE-5and10BASE-2
specifications
I
Pin-selectable SQE Test (heartbeat) option
I
Internal jabber controller prevents excessive
transmission time
I
I
Noise rejection filter ensures that only valid data
is transmitted onto the network
Collision detection on both transmit and receive
data
Collision detect threshold levels adjustable for
other networking applications
I
I
GENERAL DESCRIPTION
The Am7996 IEEE 802.3/Ethernet/Cheapernet Trans-
ceiver supports Ethernet Version 2, IEEE 802.3
10BASE-5 and IEEE 802.3 10BASE-2—Cheapernet)
transceiver applications. Transmit, receive, and colli-
sion detect functions at the coaxial media interface to
the data terminal equipment (DTE) are all performed by
this single device.
In an IEEE 802.3 (10BASE-5)/Ethernet application, the
Am7996 interfaces the coaxial (0.4
DTE through an isolating pulse transformer and the 78
attachment unit interface (AUI) cable. In IEEE 802.3
10BASE-2—Cheapernet applications, the Am7996 typi-
cally resides inside the DTE with its signals to the DTE iso-
lated and the coaxial (0.2
″
″
diameter) media to the
diameter) media directly
connected to the DTE. Transceiver power and ground in
both applications are isolated from that of the DTE.
The Am7996’s tap driver provides controlled skew and
current drive for data signaling onto the media. The jabber
controller prevents the node from transmitting exces-
sively. While transmitting, collisions on the media are de-
tected if one or more additional stations are transmitting.
The Am7996 features an optional SQE Test function
that provides a signal on the Cl pair at the end of every
transmission. The SQE Test indicates the operational
status of the Cl pair to the DTE. It can also serve as an
acknowledgment to the node that packet transmission
onto the coax was completed.
BLOCK DIAGRAM
Line
Driver
Line
Driver
Transmit
Data
Amplifier
Control
Logic
Carrier
Detect
Circuit
Receive
Data
Amplifier
Collision
Detect
Circuit
Jabber
Timer
SQE Test
Generator
Transmit
Squelch
Input
Buffer
SQE TEST
A
DO+
DO–
Control
Logic
Tap
Driver
TXT
C
Input
Buffer
CI+
CI–
DI+
DI–
RXT
07506E-1
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相關代理商/技術參數 |
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| AM79C02 | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Dual Subscriber Line Audio Processing Circuit (DSLAC) Devices |
| AM79C02ADC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:A-Law/u-Law CODEC |
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