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LXT971ABC 数据表(PDF) 30 Page - Intel Corporation

部件名 LXT971ABC
功能描述  3.3V Dual-Speed Fast Ethernet PHY Transceiver
PDF  90 Pages
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制造商  INTEL [Intel Corporation]
网页  http://www.intel.com
标志 INTEL - Intel Corporation

LXT971ABC 数据表(HTML) 30 Page - Intel Corporation

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LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
30
Datasheet
Document #: 249414
Revision #: 002
Rev. Date: August 7, 2002
3.4.5
Hardware Configuration Settings
The LXT971A provides a hardware option to set the initial device configuration. The hardware
option uses the three LED driver pins. This provides three control bits, as listed in Table 9. The
LED drivers can operate as either open-drain or open-source circuits as shown in Figure 8.
Figure 8. Hardware Configuration Settings
Table 9. Hardware Configuration Settings
Desired Mode
LED/CFGn
Pin Settings1
Resulting Register Bit Values
Control Register
AN Advertisement Registers
Auto-
Neg
Speed
(Mbps)
Duplex
1
2
3
Auto-
Neg
0.12
Speed
0.13
FD
0.8
100FD
4.8
100TX
4.7
10FD
4.6
10T
4.5
Disabled
10
Half
Low
Low
Low
0
0
0
N/A
Auto-Negotiation Adver-
tisement
Full
Low
Low
High
1
100
Half
Low
High
Low
1
0
Full
Low
High
High
1
Enabled
100
Only
Half
High
Low
Low
11
00
1
0
0
Full
High
Low
High
1
1
1
0
0
10/100
Half
Only
High
High
Low
0
0
1
0
1
Full or
Half
High
High
High
1
1
1
1
1
1. Refer to Table 7 on page 19 for LED/CFG pin assignments.
Configuration Bit = 1
Configuration Bit = 0
LED/CFG Pin
LED/CFG Pin
3.3 V
1. The LED/CFG pins automatically adjust their
polarity upon power-up or reset.
2. Unused LEDs may be implemented with pull-up/
pull-down resistors of 10 K.



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