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| 型号： | WJLXT972ALC.A4SE001 |
| 厂商： | INTEL CORP |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| 封装： | LEAD FREE, LQFP-64 |
| 文件页数： | 8/100页 |
| 文件大小： | 1046K |
| 代理商： | WJLXT972ALC.A4SE001 |
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LXT972A 3.3 V Dual-Speed Fast Ethernet Transceiver
Datasheet
15
Document #: 249186
Revision #: 003
Rev. Date: August 7, 2002
39
PWRDWN
I
Power Down. When set High, this pin puts the LXT972A in a power-
down mode.
1
2
REFCLK/XI
XO
I
O
Crystal Input and Output. A 25 MHz crystal oscillator circuit can be
connected across XI and XO. A clock can also be used at XI. Refer to
Functional Description for detailed clock requirements.
9, 10,
44
N/C
-
No Connection. These pins are not used and should not be terminated.
Table 5.
LXT972A Power Supply Signal Descriptions
LQFP
Pin#
Symbol
Type
Signal Description
51
VCCD
-
Digital Power. Requires a 3.3 V power supply.
7, 11, 13,
14, 15, 16,
18, 25, 26,
32, 34, 35,
41, 50, 61
GND
-
Ground.
8, 40
VCCIO
-
MII Power. Requires either a 3.3 V or a 2.5 V supply. Must be supplied
from the same source used to power the MAC on the other side of the MII.
21, 22
VCCA
-
Analog Power. Requires a 3.3 V power supply.
Table 6.
LXT972A JTAG Test Signal Descriptions
LQFP
Pin#
Symbol
Type1
Signal Description
27
TDI2
I
Test Data Input. Test data sampled with respect to the rising edge of TCK.
28
TDO2
O
Test Data Output. Test data driven with respect to the falling edge of TCK.
29
TMS2
I
Test Mode Select.
30
TCK2
I
Test Clock. Test clock input sourced by ATE.
31
TRST2
I
Test Reset. Test reset input sourced by ATE.
1. Type Column Coding: I = Input, O = Output, A = Analog, OD = Open Drain.
2. If JTAG port is not used, these pins do not need to be terminated.
Table 7.
LXT972A LED Signal Descriptions
LQFP
Pin#
Symbol
Type1
Signal Description
38
37
36
LED/CFG1
LED/CFG2
LED/CFG3
I/O
LED Drivers 1 -3. These pins drive LED indicators. Each LED can
display one of several available status conditions as selected by the LED
Configuration Register (refer to Table 52 on page 70 for details).
Configuration Inputs 1-3. These pins also provide initial configuration
settings (refer to Table 9 on page 25 for details).
1. Type Column Coding: I = Input, O = Output, A = Analog, OD = Open Drain
Table 4.
LXT972A Miscellaneous Signal Descriptions (Continued)
LQFP
Pin#
Symbol
Type1
Signal Description
1. Type Column Coding: I = Input, O = Output, A = Analog, OD = Open Drain
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