參數(shù)資料
型號(hào)： LXT917QC
英文描述： LAN Transceiver
中文描述： 網(wǎng)絡(luò)收發(fā)器
文件頁數(shù)： 28/42頁
文件大?。?/td> 561K
代理商： LXT917QC
LXT914
—
Flexible Quad Ethernet Repeater
28
Datasheet
3.0
Application Information
3.1
12-Port Hub Repeater
Figure 6
(Sheets 1 through 4) shows a simple 12-port hub repeater application with 3 LXT914s.
This application also provides two additional AUI ports
—
one DB-15 connector and one coaxial
port. The application shown uses the asynchronous backplane mode so no external backplane clock
source is required.
Figure 6
(Sheet 1) shows the XL93C46 EEPROM which downloads the setup parameters for all
the LXT914 devices at initialization. (This EEPROM could be replaced with a simple pull down
resistor on the SDI pin. This will select the default conditions of the set up register.) A single 20
MHz crystal provides the SYSCLK for all three LXT914 chips. The LXT914 hub repeater on Sheet
1 provides the AUI DB-15 connector as well as four twisted-pair ports.
Table 19
lists transformers
suggested for use with the LXT914.
Figure 6
(Sheet 2) shows a second LXT914 hub repeater with four TP ports and a coaxial port. The
MD-001 coax transceiver is used to implement the port. Sheet 3 shows the third LXT914 device
with its four TP ports and indicator LEDs. The AUI port of the third LXT914 hub repeater is not
used. Sheet 4 of the schematic shows the LEDs for the remaining LXT914 devices, along with the
LED operation table.
3.2
8-Port Print or File Server
Figure 7
(Sheets 1 and 2) shows an eight-port repeater attachment for an existing single port AUI
or 10BASE5 interface. This application can be added to a current design with an existing AUI or
10BASE5 interface. This circuit allows increased connectivity without the need for another
external remote hub. The application shown is a 68-pin PLCC, an asynchronous backplane with
both LXT914s in the first position.
In
Figure 7
(Sheet 1) the LXT914 is set up with the LEDs in Mode 1 with one LED per port and a
single collision LED. The twisted pair port LEDs display link integrity only. (Refer to
Table 16
.)
LED Mode 1 is selected by pulling LEDM0 High with a 1 k
resistor on pin 17 and pulling
LEDM1 Low with pin 35 attached to ground.
Figure 7
(Sheet 2) has the same configuration, mode of operation and LED Mode as used in Sheet
1. However, the AUI port has been configured as a MAU interface. This is selected when LEDJM/
AUISEL on pin 28 is pulled up through a 1 k
resistor. This mode disables the LEDJM pin as an
LED driver. (See
Table 13
.) The MAU interface now configured on the LXT914 allows the AUI
port to attach to a DTE interface. This application increases connectivity to any existing single-port
Ethernet design. This unique application allows the designer to integrate an external hub,
eliminating the need for additional external equipment.
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