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參數資料
| 型號： | MC34055 |
| 廠商： | Motorola, Inc. |
| 英文描述： | IEEE 802.3 10BASE-T TRANSCEIVER |
| 中文描述： | 的IEEE 802.3 10Base - T的收發器 |
| 文件頁數： | 12/16頁 |
| 文件大?。?/td> | 195K |
| 代理商： | MC34055 |
MC34055
12
MOTOROLA ANALOG IC DEVICE DATA
APPLICATIONS INFORMATION
The MC34055 implements the physical layer of a
10BASE–T application of IEEE 802.3. It provides the
physical connection to the media (twisted pair) and the
services required by the MAC sublayer of the Data Link
Layer. Two interfaces are defined in the IEEE 802.3
specification of the physical layer; one is the MDI providing
connection to the twisted pair; and the other is the AUI
providing connection to the encoder/decoder function of the
Data Link Layer. While the MC34055 provides the connection
to the twisted pair, a CMOS and raised ECL interface is
provided instead of an AUI.
The MC34055 implements the twisted pair interface of the
physical layer in a 802.3 10BASE–T application but circuitry
must be added if an AUI is desired, (see Figure 10 for
suggested schematic). For example, an external MAU
application requires the AUI and a twisted pair interface. A
chip capable of realizing the AUI interface is the Texas
Instruments SN75ALS085. This IC has an AUI interface and
another interface which is compatible with the MC34055. The
differential input of the 75ALS085 can be used for the
TX+/TX– terminals of the AUI. The differential drivers of the
75ASL085 can be used as the RX+/RX– and the
COL+/COL– terminals of the AUI. The other interface of the
75ALS085 then will interface to the MC34055 by three paths
shown in the application suggestion. The application
accounts for all the inputs/outputs of an external MAU.
Embedded applications do not require a full AUI and a
MC10116 can be used to interface between the raised ECL
interfaces of the MC34055 and the AUI of existing
encoder/decoder chips. The MC10116 is a MECL 10k Triple
Line Receiver with typical propagation delay and rise and fall
times (20% to 80%) of 2.0 ns. Figure 11 shows the use of the
MC10116 with the MC34055 and the AMD 7992 SIA.
In a multi–port repeater, or hub, a port is required for each
DTE connected to the IEEE 802.3 network. This port consists
of two connections, one for the TX+/TX– pair and another for
the RX+/RX– pair. The repeater unit then multiplexes these
lines so that all of the stations are capable of transmitting to
or receiving from all the other stations on the network. This
establishes the need for a transceiver without an AUI
interface. If an AUI is present with each 10BASE–T
transceiver, chip count is increased because there is a
requirement to convert from balanced to unbalanced lines
before multiplexing.
An application suggestion for the use of the MC34055
used in a multiport repeater is shown in Figure 6. Here the
receive and transmit lines for the 10BASE–T transceivers are
multiplexed by the hub hardware.
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相關代理商/技術參數 |
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| MC34059FTA | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HEX EIA-485 TRANSCEIVER with THREE-STATE OUTPUTS |
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