參數(shù)資料
型號(hào)： 8502
英文描述： 8502 Ethernet MII to AUI Interface Adapter manual 7/97
中文描述： 8502以太網(wǎng)MII接口適配器的投資者聯(lián)盟手冊(cè)7 / 97
文件頁(yè)數(shù)： 30/55頁(yè)
文件大?。?/td> 457K
代理商： 8502
8502
4-30
MD400157/D
4.3 AUI RECEIVE INTERFACE
Receive data is typically transformer coupled into the
receive inputs on DI
±
and terminated with an external
resistor as shown in Figures 7-10.
The AUI transformer specifications for the receiver are
shown n Table 11. Some sources for the AUI transformer
are isted n Table 12, but most standard AUI transformers
should meet these requirements.
Table 12. AUI Transformer Sources
Vendor
Part Number
Valor
ST7033
NanoPulse
5421-30
Pulse Engineering
PE65728
Belfuse
S553-1006-AE
PCA
EPA 1885-6
The receive nput needs to be terminated with 78 Ohms n
order to meet input impedance requirements of IEEE
802.3 Section 7. Notice that in Figures 7, 8 and 10 the
receive input has this input termination resistor broken up
into two 39 ohm 1% resistors with a 0.1
μ
F capacitor tied
between the center points and GND. This capacitor
attenuates common mode nput noise. The 0.1
μ
F capaci-
tor is optional and is only needed if the device is required
to meet the receive common mode input AC voltage
specification in IEEE 802.3 Section 7. The 0.1
μ
F capaci-
tors are not needed if the AUI is embedded, that is,
restricted to a PCB or other piece of equipment where
common mode noise is small on the AUI inputs. If the
capacitor s not needed, then the two termination resistors
can be lumped into one 78 Ohm 1% resistor across DI
±
.
In order to minimize noise pickup into the receive path,
loading on DI
±
should be minimized and both inputs
should be loaded equally.
4.0 APPLICATION INFORMATION
4.1 EXAMPLE SCHEMATICS
Typical examples of the 8502 used in external MII-AUI,
external PHY, and Network Interface Card application are
shown in Figures 7-10. Figure 7 is the 8502 used in an
external MII-AUI application. Figure 8 is the 8502 used in
an external MII-AUI application with LED's and external
EEPROM. Figure 9 is the 8502 used in an external MII-
COAX PHY application. Figure 10 s he 8502 n a Network
Interface Card application.
4.2 AUI TRANSMIT INTERFACE
The interface between the AUI outputs on DO
±
and the
AUI cable requires a transformer as shown in Figures 7-
10. A 10K resistor s also needed between RBIAS pin and
GND to provide internal bias for the transmitter. For
proper AUI output levels, the DO
±
outputs must be con-
nected to a 78 Ohm cable or some other 78 Ohm oad. No
other external components are required.
The AUI transformer specifications for the transmitter are
shown n Table 11. Some sources for the AUI transformer
are isted n Table 12, but most standard AUI transformers
should meet these requirements.
Table 11. AUI Transformer Specification
Parameter
Specification
Turns Ratio
1:1
Inductance
(
μ
H Min)
Leakage Inductance
(
μ
H Max)
75
0.4
Capacitance (pF Max)
10
DC Resistance
(Ohms Max)
0.25
To minimize noise pickup, the loading on DO
±
should be
minimized and both outputs should always be loaded
equally.
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