參數(shù)資料
型號(hào)： 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(yè)數(shù)： 25/60頁(yè)
文件大?。?/td> 869K
代理商： AM79C874VC
Am79C874
25
P R E L I M I N A R Y
External loopback can be accomplished using an ex-
ternal loopback cable with TX± connected to RX±. Ex-
ternal loopback works for both 10 Mbps and 100 Mbps
after setting Register 0, bit 8 to force full duplex and bit
13 to set the speed.
Reset
The NetPHY-1LP device can be reset in the three fol-
lowing ways:
1. During initial power on (with internal power on reset
circuit).
2. At hardware reset. A logic low signal of 10 ms pulse
width applied to the RST pin.
3. At software reset. Write a 1 to MII Register 0, bit 15.
LED Port Configuration
The NetPHY-1LP device has several pins that are used
for both device configuration and LED drivers. These
pins set the configuration of the device on the rising
edge of RST and thereafter indicate the state of the re-
spective port. See Table 4 for standard LED selections
and Table 5 for advanced LED selections.
The polarity of the LED drivers (Active-LOW or Active-
HIGH) is set at the rising edge of RST. If the pin is LOW
at the rising edge of RST, it becomes an active-HIGH
driver. If it is HIGH at the rising edge of RST, it becomes
an active-LOW driver.
Proper configuration requires pull-up or pull-down re-
sistors. As shown in the Pin Description sections, each
of the LED/Configuration pins has internal pull-up re-
sistors. If the pin
’
s LED functionality is not used, the pin
may still need to be terminated via an external pull-
down resistor according to the desired configuration.
The resistor value is not critical and can be in the range
of 1 k to 10 k . If the corresponding LED is used, the
terminating resistor must be placed in parallel with the
LED. Suggested LED connection diagrams simplifying
the board design are shown in Figure 5 (standard) and
Figure 6 (advanced).
The value of the series resistor (R
L
) should be selected
to ensure sufficient illumination of the LED. It is depen-
dent on the rating of the LED.
Table 4.
Standard LED Selections
Notes:
1. 1 means on (logic level low since active low).
2. 0 means off (logic level high since active low).
3. T means toggles (will end at logic level high).
MODE
LEDSDP[0]
LEDSDP[1]
LEDLNK
LEDDPX
LEDTX
LEDRX
LEDCOL
No Link
0
0
0
0
0
0
0
10HD-RX
0
1
1
0
0
T
0
10HD-TX
0
1
1
0
T
0
0
10HD-COL
0
1
1
0
T
T
T
10FD-RX
0
1
1
1
0
T
0
10FD-TX
0
1
1
1
T
0
0
10FD-RX+TX
0
1
1
1
T
T
0
100HD-RX
1
0
1
0
0
T
0
100HD-TX
1
0
1
0
T
0
0
100HD-COL
1
0
1
0
T
T
T
100FD-RX
1
0
1
1
0
T
0
100FD-TX
1
0
1
1
T
0
0
100FD-RX+TX
1
0
1
1
T
T
0
相關(guān)PDF資料
PDF描述
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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
AM79C875 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:NetPHY⑩ 4LP Low Power Quad 10/100-TX/FX Ethernet Transceiver
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