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參數(shù)資料
| 型號： | AM79C874VC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | NetPHY-1LP Low Power 10/100-TX/FX Ethernet Transceiver |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP80 |
| 封裝： | 12 X 12 MM, PLASTIC, MO-136BAM, TQFP-80 |
| 文件頁數(shù)： | 27/60頁 |
| 文件大?。?/td> | 869K |
| 代理商： | AM79C874VC |
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Am79C874
27
P R E L I M I N A R Y
Figure 6.
Advanced LED Configuration
Power Savings Mechanisms
The power consumption of the device is significantly re-
duced by its built-in power down features. Separate
power supply lines are also used to power the
10BASE-T circuitry and the 100BASE-TX circuitry.
Therefore, the two modes of operation can be turned-
on and turned-off independently. Whenever the Net-
PHY-1LP device is set to operate in a 100BASE-TX
mode, the 10BASE-T circuitry is powered down, and
when in 10BASE-T mode, the 100BASE-TX circuitry is
powered down.
The NetPHY-1LP device offers the following power
management: Selectable Transformer, Power Down,
Unplugged, and Idle.
Selectable Transformer
The TX outputs can drive either a 1:1 transformer or a
1.25:1 transformer. The latter can be used to reduce
transmit power further. The current at the TX pins for
a 1:1 ratio transformer is 40 mA for MLT-3 and 100 mA
for 10BASE-T. Using the 1.25:1 ratio reduces the cur-
rent to 30 mA for MLT-3 and 67 mA for 10BASE-T.
The cost of using the 1.25:1 option is in impedance
coupling. The reflected capacitance is increased by the
square of the ratio (1.25
2
= 1.56). Thus, the reflected
capacitance on the media side is roughly one and a half
times the capacitance on the board. Extra care in the
layout to control capacitance on the board is required.
Power Down
Most of the NetPHY-1LP device can be disabled via the
Power Down bit in MII Register 0, bit 11. Setting this bit
will power down the entire device with the exception of
the MDIO/MDC management circuitry.
Unplugged
The TX output driver limits the drive capability if the re-
ceiver does not detect a link partner within 4 seconds.
This prevents
“
wasted
”
power. If the receiver detects
the absence of a link partner, the transmitter is limited
to transmitting normal link pulses. Any energy detected
by the receiver enables full transmit and receive capa-
bilities. The power savings is most notable when the
port is unconnected. Typical power drops to one third of
normal.
Idle Wire
This can be achieved by writing to MII Register 16, bit
0. During this mode, if there is no data other than idles
coming in, the receive clock (RX_CLK) will turn off to
save power for the attached controller. RX_CLK will re-
sume operation one clock period prior to the assertion
of RX_DV. The receive clock will again shut off 64 clock
cycles after RX_DV gets deasserted. Typical power
savings of 100 mW can be realized in some MACs.
LEDBTA
LEDBTB
10BASE-T LED Indicator
LEDTXA
LEDTXB
100BASE-TX LED Indicator
300
5 K
330
330
330
330
300
Dual-Color
LED
Dual-Color
LED
VCC
Receive LEDRX
Collision LEDCOL
Link (Note 1) LEDLNK
Link (Note 2) LEDLNK
VCC
VCC
LED
LED
LED
LED
22235I-8
Notes
:
1. Use for non 7-wire interface configurations.
2. Use for 7-wire interface configurations.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C874VD | 制造商:Advanced Micro Devices 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP 制造商:AMD (Advanced Micro Devices) 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP |
| AM79C874VF | 制造商:Advanced Micro Devices 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP 制造商:AMD (Advanced Micro Devices) 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP |
| AM79C874VI | 制造商:Advanced Micro Devices 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP 制造商:AMD (Advanced Micro Devices) 功能描述:PHY 1-CH 10Mbps/100Mbps 80-Pin TQFP |
| AM79C874WW | 制造商:Advanced Micro Devices 功能描述:8" WAFER, DIE IN WAFER FORM, SINGLE PORT ETHERNET 10/100 - Trays |
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