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| 型號： | 22368 |
| 英文描述： | Home Networking Board Design Using PCnet-Home Devices? - (PDF) |
| 中文描述： | 家庭網(wǎng)絡電路板設計使用PCnet家用裝置？ - （PDF格式） |
| 文件頁數(shù)： | 5/14頁 |
| 文件大小： | 275K |
| 代理商： | 22368 |
4
Home Networking Board Design Using PCnet-Home Devices
EEPROM AND LED INTERFACES
PCnet-Home devices provide a 4-wire serial interface
to standard EEPROMs, such as the 93C46 from Atmel
Corporation and other vendors. The EEPROM device
can operate from either a +3.3 V or a +5 V supply. The
EEPROM is necessary to store unique board subven-
dor ID, as well as the IEEE address in order to obtain
Microsoft’s WHQL logo. Each adapter card manufac-
turer has the responsibility of ensuring that its card con-
tains a unique 48-bit IEEE address assigned to the
company by the IEEE. The assigned base address
number is then programmed into the EEPROM.
In addition, the EEPROM provides manufacturer flexi-
bility to change other home networking default settings,
such as LED indication. The EEPROM signal interface
itself is multiplexed with the LED signals. See Table 4.
Table 4.
EEPROM and LED Interfaces
LED Indication
LED0 = default is active LOW to indicate LINK status.
LED1 = default is active LOW to indicate RECEIVE
activity.
LED2 = default is active LOW to indicate SPEED.
LED3 = default is active LOW to indicate TRANSMIT activity.
LED4 = programmable to indicate various home net-
work activity.
MAGNETIC INTERFACE
PCnet-Home devices include the internal 10BASE-T
PHY for Ethernet and 1 Mbps home networking. If the
internal 10BASE-T PHY is used, a 1.42:1 magnetic
ratio is required. In addition, the voltage divider circuit
is required to bias the received differential signal pair.
The voltage bias network of 2K/1K should also have a
bypass cap on that center 1.1 volt node to ground. See
the attached schematic which has an improved Bit
Error Rate (BER).
If the external 10/100 NetPHY-1LP device is used, a
1:1 magnetic ratio is required. Also, the appropriate
signal termination is necessary for the unconnected
10BASE-T TX/RX signal pair. See
HomePNA Mode
section below.
According to the data sheets from the vendors below,
the following surface mount magnetics should work in
1 Mbps HomePNA, 10BASE-T, and 100BASE-T/TX
applications (see Table 5). Only a few part numbers for
each vendor are listed for brevity, and most vendors
offer a number of suitable devices. This is not meant to
be a comprehensive list. Magnetics vendors change
their product offering very frequently, so please contact
the vendor directly before finalizing any design.
Note:
All magnetics listed below have bandpass filter
and power surge protection built in.
Table 5.
Magnetics Vendors
Pin Name
EEPROM I/F
LEDS
EECS
EECS
EEDI/LED0
EEDI
LED0
EESK/LED1
EESK
LED1
EEDO/LED3
EEDO
LED3
LED2
--
LED2
LED4
--
LED4
Magnetics Vendor
Part No. of HomePNA-
Only Magnetic
Part No. of 10BASE-T
and HomePNA
Integrated Magnetic
Part No. of 10/100
BASE-T/TX Ethernet
and HomePNA
Integrated Magnetic
Web URL
www.apcisdn.com
www.belfuse.com
APC
APC76085
APC76160
APC76165
Belfuse
RS556-5000-05
RS556-5000-06
RS556-5000-07
Halo
—
—
FGHR-S001NG1
www.haloelectronics.com
Midcom (Nanopulse)
7074-37
7084-30
7073-30
www.midcom-inc.com
www.pcainc.com
www.pulseeng.com
PCA Electronics, Inc.
EPB5035G
EPB5036G
EPB5037G
Pulse Engineering
B6003
B6006L
B6007
YCL
FH166911
FH166901
FH166916
www.ycl.com
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