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參數(shù)資料
| 型號： | 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7 / 97 |
| 文件頁數(shù)： | 33/55頁 |
| 文件大?。?/td> | 457K |
| 代理商： | 8502 |
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8502
4-33
MD400157/D
Note that the value of the Reset bit should always be
written as a 0 from the EEI; if it is written to a 1, the device
will be resetting for eternity. Also note that the Link Detect
and Jabber Detect bits are not overwritten by he EEI. Also
note that there are some reserved bits n the Configuration
register that must be written to specific values for the
device to function properly.
4.8 OSCILLATOR
The 8502 requires a 20 Mhz reference frequency for
internal signal generation. This 20 Mhz reference fre-
quency can be generated by either connecting an external
20 MHz crystal between OSCIN and GND or by applying
an external 20 MHz clock to OSCIN.
If the crystal oscillator is used, it needs only an external
crystal, and no other external capacitors or other compo-
nents are required. The crystal must have the character-
istics shown in Table 13. The crystal must be placed as
close as possible to OSCIN and GND so that parasitics on
OSCIN are kept to a minimum.
Table 13. Crystal Specifications
Parameter
Spec
Type
Parallel Resonant
Frequency
20 Mhz +/- 0.01%
Equivelent Series
Resistance
25 ohms max
Load Capacitance
18 pF typ
Case Capacitance
7 pF max
Power Dissipation
1mW max
The normal function for PLED1 can be changed from
Collision to Link Detect by setting the PLED1 configuration
select bit in the MI serial port Configuration register.
The On and Off functions allow the LED driver to be
controlled directly through the MI serial port to ndicate any
function that is desired under external control. The Blink
function allows he same external control of the LED driver
and also offers the provision to blink the LED without the
need for any external timers.
The PLED[1:0] outputs can also drive other digital inputs.
Thus, PLED[1:0] can also be used as digital outputs
whose function can be user defined and controlled
through the MI serial port.
4.10 LINK PASSTHROUGH
The LINKI pin can be used to force the status reported on
the MI serial port Link Status output bit. If LINKI is tied to
the Link Status output pin from an external transceiver, the
link status from the external transceiver will be inverted
and passed through to and be reported on the Link Status
bit in the MI Status register.
4.11 JABBER PASSTHROUGH
The JABI pin s can be used to force the status reported on
the MI serial port Jabber Detect output bit. If JABI is tied
to the Jabber Detect output pin from an external trans-
ceiver, the Jabber Detect status from the external trans-
ceiver will be inverted and passed through to and be
reported on the Jabber Detect bit n the MI Status register.
4.12 POWER SUPPLY DECOUPLING
There are two VCC's on the 8502 (VCC[2:1]) and two
GND's (GND[2:1]).
Both VCC's should be connected together as close as
possible to the device with a arge VCC plane. If the VCC's
vary n potential by even a small amount, noise and atchup
can result. The two VCC's should be kept to within 50 mV
of each other.
Both GND's should also be connected ogether as close as
possible to the device with a large ground plane. If the
GND's vary n potential by even a small amount, noise and
latchup can result. The two VCC's should be kept to within
50 mV of each other.
A 0.01-0.1
μ
F decoupling capacitor should be connected
between each VCC/GND set as close as possible to the
device pins, preferably within 0.5". The value of the
decoupling capacitor should be selected based on
whether the noise on VCC-GND is high or low frequency.
A conservative approach would be to use two decoupling
4.9 PROGRAMMABLE LED DRIVERS
The PLED[1:0] outputs can drive LED's tied to VCC as
shown in Figure 6. The PLED[1:0] outputs can be pro-
grammed through the MI serial port to do 4 different
functions: (1) Normal Function (2) On, (3) Off, and (4)
Blink. PLED[1:0] can be programmed by appropriately
setting the LED output select bits in the MI serial port
Configuration register. When PLED[1:0] is programmed
for its Normal function, these outputs indicate the specific
functions described in the MI serial port Configuration
register shown on Table 10 (Collision, Activity). When
PLED[1:0] is programmed to be On, the LED output driver
goes low, thus turning on the LED under user control.
When PLED[1:0] s programmed to be Off, the LED output
driver will turn off, thus turning off the LED under user
control. When PLED[1:0] s programmed to Blink, the LED
output driver will continuously blink at a rate of 100 mS on,
100 mS off.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 8502 | Ethernet MII(Media Independent Interface) to AUI(Attachment Unit Interface) Interface Adapter(以太網(wǎng)獨(dú)立于媒體接口與附屬單元接口適配器) |
| 8504 | Analog Miscellaneous |
| 8503 | Analog Miscellaneous |
| 8506301YX | 16-Bit Microcontroller |
| 8506301ZX | 16-Bit Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 8502 001100 | 功能描述:連接線 20AWG 1C PVC 100’ SPOOL BROWN RoHS:否 制造商:Belden Wire & Cable 絞合:19 x 32 電壓額定值:1 kV 長度:1000 ft 線規(guī) - 美國線規(guī)（AWG）:20 絕緣材料:Tetraflouroethylene (TFE) 最大溫度:+ 200 C 類型:High Temperature, High Voltage 外殼顏色:Blue (Light) 系列:83027 |
| 8502 0011000 | 功能描述:連接線 20AWG 1C PVC 1000ft SPOOL BROWN RoHS:否 制造商:Belden Wire & Cable 絞合:19 x 32 電壓額定值:1 kV 長度:1000 ft 線規(guī) - 美國線規(guī)（AWG）:20 絕緣材料:Tetraflouroethylene (TFE) 最大溫度:+ 200 C 類型:High Temperature, High Voltage 外殼顏色:Blue (Light) 系列:83027 |
| 8502 002100 | 功能描述:連接線 20AWG 1C PVC 100’ SPOOL RED RoHS:否 制造商:Belden Wire & Cable 絞合:19 x 32 電壓額定值:1 kV 長度:1000 ft 線規(guī) - 美國線規(guī)（AWG）:20 絕緣材料:Tetraflouroethylene (TFE) 最大溫度:+ 200 C 類型:High Temperature, High Voltage 外殼顏色:Blue (Light) 系列:83027 |
| 8502 0021000 | 功能描述:連接線 20AWG 1C PVC 1000ft SPOOL RED RoHS:否 制造商:Belden Wire & Cable 絞合:19 x 32 電壓額定值:1 kV 長度:1000 ft 線規(guī) - 美國線規(guī)（AWG）:20 絕緣材料:Tetraflouroethylene (TFE) 最大溫度:+ 200 C 類型:High Temperature, High Voltage 外殼顏色:Blue (Light) 系列:83027 |
| 8502 003100 | 功能描述:連接線 20AWG 1C PVC 100’ SPOOL ORANGE RoHS:否 制造商:Belden Wire & Cable 絞合:19 x 32 電壓額定值:1 kV 長度:1000 ft 線規(guī) - 美國線規(guī)（AWG）:20 絕緣材料:Tetraflouroethylene (TFE) 最大溫度:+ 200 C 類型:High Temperature, High Voltage 外殼顏色:Blue (Light) 系列:83027 |
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