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參數(shù)資料
| 型號： | 84C24 |
| 廠商： | LSI Corporation |
| 英文描述： | Quad 10Base-T Ethernet Media Interface Adapter(四通道10Base-T以太網(wǎng)媒體接口適配器) |
| 中文描述： | 四10Base - T以太網(wǎng)媒體接口適配器（四通道10Base - T的以太網(wǎng)媒體接口適配器） |
| 文件頁數(shù)： | 26/51頁 |
| 文件大小： | 435K |
| 代理商： | 84C24 |
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84C24
4-26
MD400147/A
If no LED's are needed on the LED outputs, the selection
of addresses can be done without any external compo-
nents as shown in Figure 9c. If a high address is desired,
the pin should be eft loating and he nternal pullup will pull
the pin high during power-on reset and latch in a high
address value. If a ow address s desired, then the output
pin can either be tied directly to GND or tied to GND
through an optional 33K resistor as shown in Figure 9C.
The optional 33K resistor allows the pin to be used as a
digital output under normal conditions. Notice that the
default address in the serial port is SA[3:0] = 1111.
There are 8 serial port device address bits (PHYAD[7:0])
even hough here are only 4 address nputs (SA[3:0]). The
upper 4 serial port device address bits on PHYAD[7:4] are
not used and the device always looks for them to be 1's.
Thus, these can be used to decode the serial port by
writing one or more 0's into these bits.
Table 11. Crystal Specifications
Parameter
Type
Frequency
Equivelent Series
Resistance
Load Capacitance
Case Capacitance
Power Dissipation
Spec
Parallel Resonant
10 Mhz +/- 0.01%
25 ohms max
18 pF typ
7 pF max
1mW max
5.7 RESET
The reset function in the 84C24 resets all the internal
timers and sets all the input configuration bits in the serial
port to their default values. Reset can be nitiated nternally
or externally.
An nternal reset automatically occurs when V
CC
s applied
to the 84C24.
An external reset can be nitiated n wo ways. The irst way
to cause an external reset s to set the reset bit n the serial
port Global Configuration register. Setting this bit will
create an internal reset pulse which will clear the bit when
the reset pulse has completed. The second way to do
reset is to force an active low reset signal on the RESET
pin. Typically this reset signal would come from a micro-
processor or some other digital device.
It is not necessary to use the reset function in normal
operation; it is available if external control of reset is
desired.
5.8 DIAGNOSTIC LOOPBACK
As described in the earlier Loopback section, the 84C24
automatically loops back transmit data back into the re-
ceive path on every transmitted packet. However, t might
be necessary to provide a diagnostic loopback in which
transmit data is returned through the receive path but
transmit data s not actually sent out on TPO
±
. This can be
performed with the 84C24 by first disabling the transmitter
with the transmit disable bit in the serial port Channel
Configuration register and then transmitting a packet.
This internal loopback function will force the transmit data
back onto he receive controller nterface while not actually
sending out the data on the twisted pair interface.
Figure 9. Serial Port Device Address Selection
A.) LED OUTPUT/ADDRESS INPUT CORRESPONDENCE
B.) SETTING ADDRESS WITH LEDs
500
HIGH
C.) SETTING ADDRESS WITHOUT LEDs
HIGH
LOW
FLOAT
PLED3 SA3
PLED2 SA2
PLED1 SA1
PLED0 SA0
PLED3
PLED2
PLED1
PLED0
PLED3
PLED2
PLED1
PLED0
PLED3
PLED2
PLED1
PLED0
500
50 K
LOW
PLED3
PLED2
PLED1
PLED0
OR
≤
33 K
PLED3
PLED2
PLED1
PLED0
OPTIONAL
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 84C300A | 84C300A 4-Port Fast Ethernet Controller manual 3/98 |
| 84C30A | 84C30A 10 Mbps Controller (MAC) manual 12/96 |
| 84C300A | 4-Port Fast Ethernet Controller(四端口快速以太網(wǎng)控制器) |
| 84CNQ035 | Schottky Rectifier |
| 84CNQ040 | Schottky Rectifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 84C2A-A12-J06 | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
| 84C2A-A12-J06L | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
| 84C2A-A12-J08L | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
| 84C2A-A12-J10L | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
| 84C2A-A12-K06 | 制造商:BOURNS 制造商全稱:Bourns Electronic Solutions 功能描述:83/84 - 5/8 Square 10-Turn |
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